Answer:
-evidence that some kinds of matter are made up of waves instead of particles
-observations that cannot be explained by the theory
Explanation:
Both of these are right.
What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?
180° angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane.
conformatio Results from bond rotation, they may be interconverted by bond rotation but interconversion does NOT require the breaking of bonds, Virtually every molecule, except the simplest and most rigid, has many possible conformationsIn it the bond rotates and interactions between atoms and their electron clouds create torsional strain and steric strain in the molecule and the preferred conformations are those of lower energy where strain is minimized.the less stearic hindrance the most stable configuration, the big molecules create the most stearic hindrance dipole moment also defines the stability of conformational structure.To know more about diequatorial conformation visit : https://brainly.com/question/14703697
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What is the major elimination product obtained from the reaction of each of the following alkyl halides with hydroxide ion?
The major elimination product is 2-methylbut-2-ene and the structure can be seen as followed in the diagram attached.
The outcome of an elimination reaction is what?An elimination reaction’s main byproduct is often the more substituted alkene. This is due to the lower energy and faster progressing transition state that leads to the more substituted alkene.
What is the location of the elimination product?It is critical to first identify the electrophilic carbon in the substrate in order to determine the potential products. Next, list every hydrogen on every carbon that is next to the electrophilic carbon. Every distinct neighboring hydrogen has the potential to create a distinct elimination product.
What is an example of an elimination reaction?The kind of atoms or groups of atoms that are expelled from the molecule is a frequent way to identify elimination reactions. The elimination of a halogen and an atom of hydrogen
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What does volume measure? name two different units that might be used to measure volume.
Answer:
mL,L,cm^3
Explanation:
Which statement describes the particles that make up the rigid structure of a
three-dimensional crystalline solid?
A. They move around freely to various locations in a random pattern.
B. They move more quickly than the particles in the liquid of the
substance.
C. They move more quickly than the particles in the gas of the
substance.
D. They move by vibrating in their locations within a fixed pattern.
SUBMIT
The statement that describes the particles that make up the rigid structure of a three-dimensional crystalline solid is:
They move by vibrating in their locations within a fixed pattern; option DWhat are the nature of the particles in a solid?Solids are one of the three states in which matter exists.
Solids are characterized by their having definite shapes and volumes.
Solids have definite shapes and volumes because of the arrangement of the particles in a solid.
The intermolecular forces of the particles in a solid are very strong such that the particles are not free to move but vibrate about a fixed position.
Thus, they are arranged in rigid continuous patterns as seen in solid crystals.
In conclusion, the particles in a crystalline solid are arranged in regular repeating patterns forming a three-dimensional structure.
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the mass spectrum for an unknown element is shown above. according to the information in the spectrum, the atomic mass of the unknown element is closest to 90amu 90 a m u 91amu 91 a m u 93amu 93 a m u 94amu
Because 1s electrons are most attracted to the nucleus, peak X results.
For A(27.977 u)
Mass number = 27.977
Abundance = 78.21%
For B (28.976 u)
Mass number = 28.976
Abundance = 1.346%
For C(29.974 u)
Mass number = 29.974
Abundance = 20.444%
Averages atomic mass
= (Mass of A x abundance of A)/100 + (Mass of B x abundance of B)/100 + (Mass of C x abundance of C)/100
= (27.977x78.21)/100 + (28.976x1.346)/100 + (29.974x20.444)/100
= 21.8808117 + 0.39001696 + 6.12788456
= 28.40
What is a nucleus?In terms of genomics, a nucleus is the organelle within a cell that is membrane-enclosed and houses the chromosomes. The nuclear membrane has a variety of pores that enable the selective passage of specific molecules (such proteins and nucleic acids) into and out of the nucleus.
The nucleus carries the genes, structures that hold the genetic information, and controls and regulates the functions of the cell (such as growth and metabolism).Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like matrix in which the nuclear components are suspended is known as the nucleoplasm.
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the radius of a aluminum atom is 143 pm. how many aluminum atoms would have to be laid side by side to span a distance of 4.23 mm? atoms
the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )
= 14790210 atoms of Al.
What is the radius of an atom?
The atomic radius of an atom is the distance between the centre of the nucleus and the outermost electron in each of its energy shells. Since the border is not a clearly defined physical entity, there are many non-equivalent definitions of atomic radius. The four most popular ways to define atomic radius are van der Waals radius, ionic radius, metallic radius, and covalent radius. Due to the challenges of isolating individual atoms to measure their radii, atomic radii are frequently measured in a chemically bonded state; yet, theoretical calculations are simpler when individual atoms are taken into account.
1 pm = 10^(-9) mm
radius of Al atom = 143 pm = 143 * 10^(-9) mm
Diameter of Al atom = 2 * 143 * 10^(-9) mm
Thus, the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )
= 14790210 atoms of Al.
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A hammer and a feather are dropped from the same height. Imagine that there is no resistance to the objects' motion in air. Which value will be different for the two objects?(1 point)
the time it takes for them to fall
the time it takes for them to fall
the upward push of air resistance
the upward push of air resistance
the velocity of the objects
the velocity of the objects
the gravitational attraction between the Earth and the objects
the gravitational attraction between the Earth and the objects
The value that would be different for the hammer and the feather dropped from the same height is the the upward push of air resistance.
What is gravity?The term gravity has to do with the force that is exerted on a body as a result of its presence in the earth's gravitational field. When an object s falling down, the acceleration due to gravity acts on the object.
We know that irrespective mass, the acceleration due to gravity is the same on all the objects that are on earth. This is because all objects are accelerated to the same extent on the earth's gravitational filed.
Thus, the value that would be different for the hammer and the feather dropped from the same height is the the upward push of air resistance.
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Answer:
The time it takes for them to fall.
Explanation:
I hope it help you.
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what is 26.1 celsius converted to kelvin
Answer:
299.25, or if you round it up 300
Formula to find kelvin: Celsius + 273.15 = Kelvin
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)
the combustion of one mole of liequid hexane releases 3800kj. when 2.3 g of hexane is combusted in a bomb calorimeter
2.3 g of hexane is combusted in a bomb calorimeter.
What is combustion of hexane?
Hexane also engages in hydrocarbon combustion, forming carbon dioxide when combined with oxygen. The complete combustion of hexane yields the following chemical equation: The burning of hydrocarbons releases heat energy and is an example of an exothermic reaction.
Strong intermolecular interactions make up the non-polar, extremely volatile molecule known as hexane. It burns, releasing carbon dioxide and water as a byproduct.
2C6H14 + 19O2 → 12CO2 + 14H2O
Combustion of 1 mole of hexane releases 3800KJ of energy.
86 g hexane = 1 mole
Thus, 2.3 g hexane = 2.3/86 mole = 0.0267 mole.
Thus combustion of 0.0267 mole of hexane releases 3800*0.0267 KJ energy = 101.46 KJ energy. in a bomb calorimeter.
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A neutral atom has a mass number of 80 and has 45 neutrons. write its atomic symbol.
A neutral atom has a mass number of 80 and has 45 neutrons.
What is mass no.?
mass number The total of the protons and neutrons is how it is described. The atomic mass of a specific atom is nearly equivalent to the mass number.
For the given problem, we have mass no = 80
Now, we know that, mass no. = no. of (neutrons + protons)
Hence here, no of protons = 80-45 = 35,which is again equal to the no of electrons, which corresponds to the atomic no. of a specific element. Here atomic no 35 corresponds to Bromine atom and its symbol is Br.
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What are two ways engineers use their understanding of ke and pe to make their designs safer
The energy formed in a system by the motion of particles is called kinetic energy. which is half of the product of the mass and volume
k.E = mv^2/2
When someone is riding on an amusement ride also known as a roller coaster, due to the nature of the turns and slope, energy will change from potential to kinetic energy and it will be repeated a couple of times throughout the course of the ride.
The energy stored in the system when it's at a rest is called potential energy, the energy is converted into kinetic energy. when it starts moving. The potential energy is stated as the product of the mass, height, and acceleration due to gravity.
Normally, the amusement ride vehicles will be pulled up from the first hill by a chain and as the other vehicles follow that route in climbing, and they will then gain potential energy
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Consider a 500. ml buffer that contains 0.12 m hocl and 0.080 m kocl. what is the ph of this buffer if ka (hocl) = 3.5 x 10-8? (hint: remember the henderson-hasselbach eqn)
The pH of this buffer after adding 2.5 ml of 10m KOH to the solution is 7.73
What is the ph of this buffer after adding 2.5 ml of 10m KOH to the solution?The HOCl/KOCl buffer has a pKa of 7.46. We can use the H-H equation to determine the pH of this buffer:
[tex]pH = pKa + log / \frac{[A^{-} ]}{[HA]}[/tex]
[tex]pH = 7.46 + log \frac{ [KOCl] }{[HOCl]}[/tex]
Where [] represents the molarity (or moles) of each compound.
Initial HClO and NaClO moles:
HOCl :-0.500L * (0.12mol / L) = 0.06 moles HOCl
KOCl:- 0.500L * (0.080mol / L) =0.04 moles KOCl
HOCl now reacts with KOH to form KOCl:
[tex]HOCl + KOH ----- > KOCl + H_{2} O[/tex]
The moles of KOH in the reaction are as follows:
[tex]2.5x10^{-3} L * (10mol /L) = 0.025 moles KOH[/tex]
That is, 0.025 moles of HOCl are consumed and 0.025 moles of KOCl are produced after the reaction.
Following the reaction, moles are:
The final moles:
HOCl:- 0.06mol - 0.025mol = 0.035mol HOCl
KOCl :-0.04mol + 0.025mol = 0.065mol KOCl
Replacing in the H-H equation:
[tex]pH = 7.46 + log\frac{ [0.065mol] }{ [0.035mol]}[/tex]
pH = 7.73
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How many grams of oxalic acid dihydrate is needed to preapare 500.0 ml of a 0.185m?
11.7 grams of oxalic acid dihydrate is needed to prepare 500.0 ml of a 0.185 M.
The amount of a solute per unit volume of a solution, or the concentration of a chemical species in a solution, is expressed as a solute's molar concentration.
The number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units, is the most widely used unit for measuring molarity.
500 ml of a 0185 M solution is prepared using x grams of oxalic acid dihydrate.
Oxalic acid dihydrate :- (COOH)₂ . 2H₂O
The molar quantity will be:
500 ml × 10⁻³ L / ml × 0.185 mol / L = 0.0925 mol with respect to oxalic acid dihydrate.
The molar mass of oxalic acid dihydrate (COOH)₂ . 2H₂O is 126.07 g / mol.
Therefore, the grams of the oxalic acid required will be:
= 126.07 g / mol × 0.0925 mol
= 11.661475 grams.
= 11.7 grams
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In joining two molecules by dehydration synthesis, a(n) ______ group is removed from one molecule and a(n) ______ from the other; a new chemical bond then forms between the molecules.
In joining two molecules by dehydration synthesis, a(n) hydroxyl (-OH) group is removed from one molecule and a(n) hydrogen (H) from the other
Dehydration reactions can be defined as the is the reaction in which a molecule of water is eliminated from the reactant molecule. here dehydration synthesis means the process of combination of two molecules with the elimination of water molecules. that's why hydroxyl (-OH) group is removed from one molecule and hydrogen (H) loses from the other this two functional group are removed and then a new chemical bond then forms between the molecules.
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what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. methane hydronium ion water glucose hydroxide ion
Hydronium ion are positively charged molecule
Here as per given data hydronium ion are positively charged molecule consists of three hydrogen atoms bonded to an oxygen atom, this molecule is written as H3O⁺ that's why it is called hydronium ion. this means that in the bond between hydrogen and oxygen and oxygen pull harder on the shared electrons thus causing a partial negative charge on the molecule and causing it to be attracted to the positive charge of H⁺ to form hydronium.
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When acetic acid and sodium bicarbonate react, why does total mass of the beaker contents decrease?
Because carbon dioxide is released during the reaction between acetic acid and sodium bicarbonate, the total mass of the beaker's contents decreases.
What is acetic acid?Acetic acid, systematically named ethanoic acid, is acidic, colorless liquid and organic compound with the chemical formula CH3COOH (also written as CH3CO2H, C2H4O2, or HC2H3O2). Vinegar is at least 4% acetic acid by volume, making the acetic acid the main component of vinegar apart from water and other trace elements.
Acetic acid is second simplest carboxylic acid (after formic acid) and its functional group is methyl. It is an important chemical reagent and industrial chemical, used primarily in production of cellulose acetate for photographic film, polyvinyl acetate for wood glue, and synthetic fibers and fabrics.
In the households, diluted acetic acid is often used in descaling agents. In food industry, acetic acid is controlled by the food additive code E260 as an acidity regulator and as a condiment. In biochemistry, acetyl group, derived from acetic acid, is fundamental to all forms of life. When bound to the coenzyme A, it is central to the metabolism of carbohydrates and fats.
The global demand for the acetic acid is about 6.5 million metric tons per year (t/a), of which approximately 1.5 t/a is met by recycling; the remainder is manufactured from methanol. Vinegar is the mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol.
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As a rule of thumb, the air leaving the evaporator will be about ____ than the air entering the evaporator.
As a rule of thumb, the air leaving the evaporator will be about 17-20° cooler than the air entering the evaporator.
The refrigeration cycle can justify the above statement. The refrigeration cycle depicts the transfer of the heat.
Heat is rejected by the condensor and it is absorbed by the evaporator. The refrigerant when enters in the evaporator, it is a cold low pressure liquid. Then the refrigerant starts boiling and then soon evaporates. This evaporation creates a cooling effect and the heat is removed and carried to be dumped in condensor.
The heat which is removed from the air and flowing over the evaporator makes the air feel cooler. This cooler air is then blew back by the evaporator fan back into the space which is being cooled.
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Which chemical group is most likely to be responsible for an organic molecule behaving as a base? (a) hydroxyl (c) amino (b) carbonyl (d) phosphate
The chemical group which is most likely to be responsible for an orgainc molecule behaving as a base is Amino group.
Amines are the nitrogen containing organic bases. Simple organic molecules such as methylamine, H₃N-CH₃, and ethylamine, H₃N-CH₂CH₃ are the bronsted bases.
Functional group is a group of atoms in molecule which have the different and separate chemical properties. It provide certain characteristics to the molecule. The functional group gets attached to the carbon atom.
Functional groups can behave as a base or an acid. It relies in their structure's ability to accept or to donate the H⁺ ions.
Amino group is represented as :
R \ NH₂ . .Amino group has ability to accept the H⁺ ions from the solution, it forms NH₃⁺.
--NH₂ + H⁺ → NH₃⁺
Therefore, Amino group is most likely to be responsible for an organic molecule behaving as a base.
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a certain ore is 35.4% nickel by mass. how many kilograms of this ore would you need to dig up to have 55.0 g of nickel?
If a certain ore is 35.4% nickel by mass. To have 55.0 g of nickel, we have to dig up 0.155 kg of this ore.
Mass percent of Nickel = (mass of Nickel/mass oft he ore)×100
= 35.4%
This means that in 100 g of ore we have 35.4 g of nickel.
So, 35.4 g of Nickel is present in = 100 g of the ore
1g of Nickel is present in = 100/35.4 g of the ore
55.0 g of Nickel is present in = (100/35.4) × 55.0 g of the ore
= 155.3 g of the ore
1 g = 1/1000 kg
155.3 g = 155.3/1000 kg
= 0.155 kg
So, we need to dig 0.155 kg of the ore to get 55.0 g of Nickel.
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Determine the normal stress and shear stress acting on the inclined plane ab. solve the problem using the stress transformation equations. show the results on the sectional element.
The total quantity of cresol solution is q1= 8.25.
What is cresol solution?Cresols (also hydroxytoluene or cresylic acid) are group of aromatic organic compounds. They are the widely-occurring phenols (sometimes called phenolics) which may be either natural or manufactured. They are also categorized as the methyl phenols. Cresols commonly occur as either solids or liquids because their melting points are generally close to the room temperature. Like the other types of phenols, they are slowly oxidized by exposure to air, and the resulting impurities often give the samples a yellow to brownish red tint. Cresols have an odor characteristic to that of the other simple phenols, reminiscent to some of a "coal tar" smell. The name "cresol" is an adduct of the phenol and their traditional source, creosote.
A flavorless, CH3COC6H3(CH3)OH, made from the gualac resin and beechwood tar, it is an active ingredient in creosote and is used as an antibacterial. Word genesis.
total quantity (q2) = 50ml
concentration of final solution
C2 = 1:150
= 1/150* 100
= 0.66%
quantity of stock * concentration of stock= quantity of final solution * concentration of final solution.
q1 * c1= q2 * c2
q1= 50*0.66/4
= 8.25ml
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A sample of water has a volume of 560
mL and a mass of 560 g. What is the
density of the water?
Explanation:
density=mass÷volume
density= 560÷560
density= 1 g/mL
caffeine (c8h10n4o2) is the world's most consumed psychoactive drug. it's common name is 1,3,7-trimethylxanthine. it is completely absorbed within 30 to 45 minutes and it effects diminish within about three hours. what is the molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution? enter to 4 decimal places.
The molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.
The formula for molarity is,
M = n / V
where, M = molarity of solution
V = volume of solution in litres
where, n = given mass / molar mass
n = 14.1 /194.19
n = 0.0726
So, molarity is
M = 0.0726 / 0.942
M = 0.0770 mol/l
Therefore, molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.
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The lab experiment introduces you to the chemistry of elemental copper. Copper will undergo several chemical transformations, represented by the chemical formulas given. What is the correct sequence of chemical transformations with the correct phases? begin with 1 and and with 6.
The proper order of chemical reactions of copper in the right phases is
1. Cu(s) 2. Cu(NO3)2 (aq) 3. Cu(OH)2 (s) 4. CuO (s) 5. CuSO4 (aq) 6. Cu(s)
What are the properties of copper?
One of the first metals that people used was copper. The primary causes of this are the fact that it is a native metal, meaning it can be found naturally in a usable state, and that it possesses advantageous metallurgical qualities. Malachite, cuprite, azurite, bornite, and chalcopyrite are other minerals that naturally include it.
Copper is softer than zinc and has a bright finish when polished. Along with silver and gold, it can be found in group Ib of the periodic table. Chemical reactivity is minimal for copper.
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There is virtually no matter between the Earth and the Moon, only empty space.
Image courtesy of NASA
Yet the Earth and Moon are able to exert a force on each other because
Answer:
of gravity
Explanation:
lmk if this is wrong
what mass of ammonium thiocyanate must be used if it is to react completely with 6.7 g barium hydroxide octahydrate?
3.04 gm of ammonium thiocyanate is used to react completely with a molecular mass of 6.7 gm of barium hydroxide octahydrate.
What is molecular mass?The total atomic masses of all the atoms in a molecule make up its molecular mass. The molecular mass indicates a molecule's mass in relation to the ¹²C atom, whose mass is assumed to be 12. Although molecular mass is a dimensionless number, it is assigned the unit Dalton, also known as the atomic mass unit, to indicate that it is equivalent to 1/12th the mass of a single carbon-12 atom.Although it is often accepted that molecular weight and relative molecular mass are synonymous, in actuality, the two terms are very varied.A weighted average equivalent to the molar mass but with different units is usually employed when the molecular weight is used with the units Da or u.The molecular weight, which is stated in kDa and is used in molecular biology to describe the mass of macromolecules, is frequently imprecise and denotes an average.
Ba(OH)₂.8H₂O + 2NH₄ScN⇒ Ba(ScN)₂ + 10H₂O + 2NH₃
weight = Molecular mass × Number of moles
moles of barium hydroxide octahydrate = 6.5/315 = 0.02 M
moles of ammonium thiocyanate = 2 × 0.02 = 0.04 M
weight of ammonium thiocyanate required = 0.04 × 76.1 = 3.044 gm.
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Suppose it takes 12.69 ml of 0.0026 m i2 solution to reach the end point of the titration. how many moles of vitamin c are present?
Moles of vitamin c are present is 3.299 x 10^-5 mol
Sol:
12.69 mL x 1L/1000mL x 0.0053 M
What is mole?
A fundamental unit of measurement used by chemists is the mole. Chemists use moles to quantify extremely small substances like atoms, molecules, or other particles.
Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality. Units are created when preexisting ones are insufficient. At the same time that using absolute numbers of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would be inappropriate.
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some compounds can be seen under uv light becasue they are inherently fluorescent and usually glow brightly
some compounds are often seen under uv light becasue they are inherently fluorescent and usually glow brightly due to presence of impurities
What are fluorescent compounds?the light that a material emits when exposed to photons of a different wavelength. When exposed to UV radiation, a fluorescent object frequently emits light . The fluorescent properties of some deep sea fish and fireflies are samples of fluorescence in nature.
When a substance passes through fluorescence, it emits light after having absorbed light or other electromagnetic wave . B2 emits a yellow colour while fluorescing. tonic glows blue because it contains quinine. Benzimidazoles, benzothiazoles, coumarins, vitamins like cyanocobalamine, fluorene, and pentacene are samples of fluorescent materials.
Why do compounds glow under UV light?When UV light bounces off objects that contain special substances called phosphors, interesting things happen. Phosphors are substances that emit visible light in response to radiation. Phosphors hit by UV light become excited and naturally fluoresce, or in other words, glow
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First Steps
THE LANDING
As the lander hit, Maria drew a jagged breath, and her chest muscles clenched tight with anxiety. Captain Curran, the group leader, turned around and smiled at Maria and her five friends.
“All right,” he said with forced joviality. “Who wants to be the first of the generations born in space to set foot on a real planet?”
Maria waited for someone else to speak or raise their hand. Next to her, Allen just stared at the floor of the lander muttering, “Not me, not me.”
She glanced at Lily, who Maria had always known to be fearless, but Lily bit her lip and turned away. Javier looked positively gray, and the twins buried their faces in their hands. Someone would have to be first. Maria closed her eyes and took a few meditative breaths, waiting for someone else to volunteer, but the lander was silent.
FINDING COURAGE
The radio crackled to life. “Lander one, this is Mothership, do you copy?”
“Yes,” Captain Curran answered. “We’ve landed safely and are waiting to exit the lander, but there’s just a little…disagreement…over which pioneer wants to be the first to set foot on our new home.”
“Tell them there’s plenty for everyone to see, and they’re going to love it out there,” the voice on the radio responded. “I wish it were me instead of you; I miss the feel of real air on my face.”
Captain Curran flipped off the microphone. “You six have lived your entire lives in space, and it’s a great privilege to be the first of your generation to see a new planet. The others are watching; if you’re afraid, they’ll be afraid. Can’t any of you find the courage to set an example?”
Maria shifted uncomfortably in her seat and thought of her parents; they had traveled across the galaxy to find their family a new home, with clean air and good soil, and she knew this planet was for them. “I’ll do it, Captain,” she mumbled as she slipped out of her harness and rose out of her seat. Maria couldn’t shake the feeling of trepidation as she stood and watched the doors of the lander slide open.
A NEW WORLD
A burst of air hit Maria in the face. She scrunched up her nose as an unfamiliar assortment of odors hit her nostrils. Some smelled sweet, some disgusting, and some were just strange. There were never strange smells on the ship; everything was always the same there. What was it going to be like to live where things changed? The rest of the children gathered around the opening as she climbed down the ladder, and Maria tried to smile as she met their worried eyes. Then, suddenly, something crunched underneath her boots; she was standing on the surface of the planet, and it felt nothing like the smooth metallic halls that she’d known all her life.
Without letting go of the ladder, she turned around to look at the world around the lander. The soil was full of shapes and textures; there were some small, grainy pieces, then larger clumps that she could break with the toe of her boot. One piece was hard and smooth, and she let go of the ladder to pick it up. “Captain,” she called, “I think I’ve found a rock!”
The air was moving, and long, thin, green things bowed and danced. “Grasses,” Maria whispered to herself, remembering the videos in her science lessons. She let go of the ladder and took soft, slow steps and realized her arms and legs felt like they were full of lead. “Natural gravity,” she whispered to herself. She started to walk a little more quickly, getting used to the new sensation. She was doing what others had previously thought impossible—taking steps on a new world.
A creature with gossamer wings landed on her nose, and she crossed her eyes trying to get a good look at it. Something small and furry scurried across her feet as she spun in a slow circle. Inspired, she ran as fast as she could across the foreign soil; she’d never seen somewhere so big, and it was thrilling. Suddenly, a deep, low sound echoed around her.
“That’s the call of a hornbeast,” Captain Curran shouted from the bottom of the ladder. Maria glanced back and saw that he was helping her friends take tentative first steps in the new world. “Walk to your left a little, and there should be a stream—flowing water on the ground; they often go there to drink, the explorers say.”
She started to run in that direction and then paused. “Hurry up!” she yelled, unable to contain her enthusiasm. “Our new home is extraordinary!”
Question
In “First Steps,” which theme is developed by Maria’s volunteering to leave the lander?
Some things cannot be learned in school.
Some things cannot be learned in school.
It takes courage to be the first to try something new.
It takes courage to be the first to try something new.
Taking unnecessary risks is foolish.
Taking unnecessary risks is foolish.
Great tasks can be accomplished by working as a team.
Answer:
I think it is C. It takes courage to be the first to try something new.
Explanation:
The story showed her courage to the first to try something new.
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Volatile chemicals are agents that are able to change easily from a ________ into a ________.
Volatile chemicals are agents that are able to change easily from a liquid into a gas.
What are volatile substances?
In the field of chemistry, "volatile" refers to susbtances which vaporise easily .Volatility can be defined as the measure on how fast the conversion of liquid to gas phase takes place.learn more about volatile substances
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which of the nonsilicate groups contains minerals that are commonly yellow in color, have a metallic luster, and contain important metal ores?
Sulfides are the non silicate groups contains minerals that are commonly yellow in color, have a metallic luster, and contain important metal ores.
How is metal ore formed?Metallic ores occur in all kinds of rock and some varieties of soil. The metallic minerals are concentrated into rich masses by igneous, hydrothermal, or erosional/weathering processes. Metals like chromium, platinum, nickel, copper, and iron can precipitate as sulfide minerals during a cooling body of magma.
What are the group of silicates?Of the approximately 600 known silicate minerals, only some dozen—a group that includes the feldspars, amphiboles, pyroxenes, micas, olivines, feldspathoids, and zeolites—are significant in rock formation. The silicates, due to their abundance on Earth, constitute the foremost important mineral class.
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