Answer: C. The particles in salt water are spread throughout.
Explanation:
Homogeneous mixtures: It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different. There is no physical boundary between the dispersed phase and dispersion medium. Example: Salt dissolved in water.
Heterogeneous mixtures: It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different. There is a physical boundary between the dispersed phase and dispersion medium. Example: sand in water.
Answer:
Its c
Explanation:
A solution is a mixture where one substance is dissolved in another. One example of a solution is salt water. Why does salt water appear to be a single substance even though it contains more than one substance. Got it right in school city
Help!
(Chose all the right answers)
Glucose is made of molecules with the chemical formula seen in the picture
What can we say about glucose molecules?
A) There are 3 different types of atoms in glucose
B) 2 glucose molecules would have 12 C atoms in total
C) Glucose is an element
D) Each glucose has 18 atoms in total
The temperature at which the motion of particles theoretically ceases is..
A. 0 K
B. 0°C
C. -273 K
D. 273°C
If half of a radioactive isotope decays in one hour, how much of the original isotope will remain after three hours?
Answer:
1/8
Explanation:
Use logic,
every one hour, half of a radioactive remains
for the first hour, half remains
for the second hour, half of half remains or quarter remains
for the third hour, 1/2 of 1/2 of 1/2 or 1/8 remains
or use this equation
[tex]n = r ({ \frac{1}{2} })^{ \frac{f}{t} } [/tex]
where
n = amount after f time
r = amount of the original isotope
f = time
t = half-life
Calculate the number of grams of solute in 814.2mL of 0.227 M calcium acetate
Answer:
Mass = 29.23 g
Explanation:
Given data:
Volume of solution = 814.2 mL 814.2/1000 = 0.8142 L)
Molarity of solution = 0.227 M
Mass of solute in gram = ?
Solution:
Molarity = number of moles / volume in L
By putting values,
0.227 M = number of moles / 0.8142 L
Number of moles = 0.227 M × 0.8142 L
Number of moles = 0.184 mol
Mass in gram:
Mass = number of moles × molar mass
Molar mass of calcium acetate = 158.17 g/mol
Mass = 0.184 mol × 158.17 g/mol
Mass = 29.23 g
Average Temp: Include Highs and Lows for a year
Average Rainfall (if on land)
Other geographic Features
Unique Conditions of the Biome
MY BIOME IS RAINFOREST, ANSWER THE QUESTIONS
i tried i hope this helps hun word “rain forest” implies that these are the some of the world’s wettest ecosystems. Rain forests generally receive very high rainfall each year, although the exact amount varies among different years and different rain forests. For example, South America’s tropical rain forests receive between 200 and 300 centimetres (80 and 120 inches, or 6.5 to 10 feet!) of rain in a typical year. Despite relatively consistent rain in these ecosystems, there are distinct dry seasons in some rain forests. Wet and dry seasons of tropical rain forests vary in their timing, duration and severity around the globe. Tropical rain forests also have high humidity; about 88% during the wet season and approximately 77% in the dry season.
A car traveled a distance of 30 km in 20 seconds (1/3 hour). What was the speed of the car?
Answer:
90.1km/hr
Explanation:
Given parameters:
Distance = 30km
Time = 20s = 0.33hr
Unknown :
Speed of the car = ?
Solution:
To solve this problem;
Speed = [tex]\frac{distance }{time}[/tex]
Now insert the parameters and solve;
Speed = [tex]\frac{30}{0.333}[/tex] = 90.1km/hr
7. A 10.0 cm3 sample of copper has a mass of 89.6 g. What is the density of copper?
Answer:
d = 8.96 g/cm³
Explanation:
Given data:
Volume of sample = 10.0 cm³
Mass of copper = 89.6 g
Density of copper = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
by putting values,
d = 89.6 g/ 10.0 cm³
d = 8.96 g/cm³
Which statement best describes the density of an atom's nucleus?
A The nucleus occupies most of the atom's volume but contains little of its mass,
The nucleus occupies very little of the ston's volume and contains little of its mass.
The nucleus occupies most of the stom's volume and contains most of its mass
The nucleus occupies very little of the ston's volume but contains most of its mass
Answer:
D. The nucleus occupies very little of the volume but contains most of its mass
Explanation:
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of an atom's nucleus ÷volume marked on the graduated cylinder
Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. The nucleus occupies very little of the volume but contains most of its mass.
Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
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___co+__ Na2s--> ___ Na+ ___ cos2
Answer: [tex]Co+2Na_2S\rightarrow 4Na+CoS_2[/tex]
Explanation:
According to law of conservation of mass, mass can neither be created nor be destroyed. The atoms on the reactant side must be equal to the number of atoms on the product side so that the mass remains the same on reactant and product side. Thus the reactions are balanced.
Single displacement reaction is one where a more reactive element replaces the lesser reactive one.
The balanced chemical reaction will be:
[tex]Co+2Na_2S\rightarrow 4Na+CoS_2[/tex]
Please help thank you!
Which of the following is the correct definition for a compound?
A substance that can be separated into two or more substances only by chemical means.
A substance that cannot be separated into more substances.
A substance that can be separated into two or more substances by chemical or physical means.
A substance that can be separated into two or more substances only by physical means.
Answer:
A: A substance that can be separated into two or more substances only by chemical means.
Explanation:
The best answer for this would be A. A compound in general is when two or more elements are bonded chemically. That is, the elements are joined in a chemical reaction. An example of a compound is table salt; (sodium chloride) NaCl. It, like all chemicals, can be separated into both of its components, so B is out. The other two answers basically say is it either only chemical or physical means that can separate it, when the answer is that it is only chemical changes that can separate a compound. There can be a reaction when a compound is broken up. You might think that you can separate salt crystals with a hammer or some physical force, but that's only the salt lattice, not the Na and Cl coming apart. Also, for the compound water, H2O, the Hydrogen and Oxygen can be separated by running an electric current through the water sample. This chemically alters the water molecule and splits it up, which is a chemical change. So, to sum up here, you can only use chemical means to separate a compound. Take care!
A compound is a substance that can be separated into two or more of its constituents by chemical methods. So the correct option is A.
What is a chemical compound?
Any material made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.
Atoms from more than 100 distinct chemical elements, both in their pure forms and when mixed to create chemical compounds, make up all matter in the universe. A sample of a pure element has just the atoms that are distinctive of that element, and each element's atoms are distinct.
For instance, the atoms that make up carbon differ from those that make up iron, which differs from those that makeup gold. Every element has a distinct symbol that is made up of one, two, or three letters that come from either the element's current name or its original name.
Therefore the correct option is A.
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Rift valleys can form when fractures in Earth's crust widen. The valley walls slowly move apart at a rate of only a few millimeters a year.
Which type of boundary would rift valleys form at?
A. Convergent
B. Divergent
C. Transform
D. Transform Fault
Answer:
B. Divergent
Explanation:
Rift valleys are usually formed at divergent margins where fractures in the earth's crust widens.
The fracture widens due the pulling apart of the plates that are involved.
Most rift valleys are located within the continental crust. One of the prominent rift margins in the world is the East Africa rift valley system. This creates a crack within the earth that continues to grow as the separation continues.If we react 5.4g of sodium chloride with an unknown amount of fluorine gas, we produce 4.9g of sodium fluoride and 3.7g chlorine gas. How much fluorine was consumed in the reaction?
Answer:
1.9g of F₂ were consumed in the reaction
Explanation:
Based on the chemical reaction:
2NaCl + F₂ → 2 NaF + Cl₂
Where 2 moles of NaCl react per mole of F₂ to produce 2 moles of NaF and 1 mole of Cl₂
To understand in a better way how the reaction occurs we need to convert each mass of compound to moles:
Moles of NaCl -Molar mass: 58.44g/mol-:
5.4g * (1mol / 58.44g) = 0.092 moles NaCl
Moles of NaF -Molar mass: 41.988g/mol-:
4.9g * (1mol / 41.998g) = 0.12 moles NaF
Moles of Cl₂ -Molar mass: 70.90g/mol-:
3.7g * (1mol / 70.90g) = 0.052 moles Cl₂
That means approximately 0.1 moles of NaCl react with 0.05 moles of F₂ to produce 0.1moles of NaF and 0.05 moles of Cl₂.
0.05 moles of F₂ are:
0.05 moles * (38g/mol) =
1.9g of F₂ were consumed in the reactionThe symbol for iron is Fe. The chemical symbol for oxygen is O. The formula for iron oxide, a type of rust is Fe2O3. How many iron atoms are in one molecule of iron oxide? A. 1
B. 2
C. 3
D. 4
The compound F2O has two lone pairs on the central oxygen atom. What's the structure of an F2O molecule? Is this compound polar or non-polar? Question 1 options: A) Bent or angular, polar B) Trigonal planar, polar C) Bent or angular, non-polar D) Trigonal planar, non-polar
Answer: A) Bent or angular, polar
Explanation:
The central atom oxygen has two lone pairs and two bond pairs in [tex]OF_2[/tex]. The number of electron pairs are 4, that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.
The compound [tex]OF_2[/tex] is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.
How many grams of KClO3 will dissolve in 300g of water at 50°C?
Answer:
50 g
Explanation:
Please brainiest
Chloe wants to lighten the color of her dark hair, which will require the use of both haircolor and hydrogen peroxide. Hydrogen peroxide (H2O2) is an example of a(n):
compound molecule.
elemental molecule.
immiscible liquid.
miscible liquid.
Answer:
H₂O₂
Explanation:
Hydrogen peroxide is a typical example of a compound molecule. A compound is made up of one or more atoms that are combined together in a definite grouping.
The properties of a compound is different from those of the elements that combines to from them.
A molecule is a covalent compound that has discrete or separate units. The formula of such compound represents a certain discrete entity. From this problem, we know that hydrogen peroxide is a covalent compoundHow many total oxygen atoms are represented in the formula 3 Ca(NO2)2?
O 24
O 6
O9
O 12
helpppppp plzzzzz lol
I belive it is A. or B. because During the day it gets really hot and during the night it gets really cold. Mercury has no tilt, so its seasons are caused by its highly elliptical path around the Sun. Venus is the second closest planet to the Sun. Its orbit does not cause the seasons because it is nearly circular.
Answer:
I am guessing B, but I am not so sure.
Explanation:
And could luck in NWEA tests. They are so annoying.
What are 3 ways you know something is living
How many representative particles are 9.01 moles of water? (Make sure to write you answer in scientific notation.)
PLEASE HELP!!!!
Answer:
54.26 × 10²³ representative particles
Explanation:
Given data:
Number of moles of water = 9.01 mol
Number of representative particle = ?
Solution:
one mole of any substance contain 6.022 ×10²³ representative particles.
9.01 mol × 6.022 ×10²³ representative particles
54.26 ×10²³ representative particles
The number 6.022 × 10²³ is called Avogadro number.
"It is the number of atoms , ions , molecules or representative particles in one gram atom of element, one gram molecules of compound and one gram ions of a substance "
The number 6.02 x 1023 is called...
i need help what is the name for 6.02 x10^23
Which statement accurately represents the properties of these moles.. help ASAP, teacher didn’t teach me this
Answer:
1 mole of O₂ has more mass compared to 1 mole of Na
Explanation:
1 mole oxygen atom and 1 mole of Na atom has the same number of particles.
A mole of any substance has the Avogadro number of particles which is
6.02 x 10²³
Mass of a substance = number of moles x molar mass
Molar mass of O₂ = 2(16) = 32g/mol
Molar mass of Na = 23g/mol
Mass of O₂ = 1 x 32 = 32g
Mass of Na = 1 x 23 = 23g
So, 1 mole of O₂ has more mass compared to 1 mole of Na
Which of the following is an example of an electromagnetic wave?
Seismic wave
Radio wave
Water wave
Sound wave?
Answer:
Radio wave
Explanation:
Radio waves are a type of electromagnetic wave radiation with wavelengths in the electromagnetic spectrum longer than infrared light
A seismic wave is an elastic wave generated by an impulse such as an earthquake or an explosion.
Sound and water waves are mechanical waves; meaning, they require a medium to travel through.
What happens to hydrogen during hydrogen bonding?
The proton spends a lot of time away from hydrogen and hydrogen's electron is exposed for
interaction
The electron spends a lot of time away from hydrogen and hydrogen's electron is exposed for
interaction
The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
The proton spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
Answer:
The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
Explanation:
I got the question right
During hydrogen bonding, The electron of hydrogen spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction. Option C is correct.
The presence of hydrogen atoms bound to strongly electronegative elements like nitrogen, oxygen, or fluorine as well as the polarity of the molecule determine whether hydrogen bonds are present in the molecule.
The electron density in the bond between a hydrogen atom and one of these electronegative atoms shifts in favor of the electronegative atom, giving rise to a partial positive charge on the hydrogen atom and a partial negative charge on the electronegative atom. Therefore, the hydrogen atoms in one molecule can establish hydrogen bonds with the electronegative atoms in other molecules.
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The question should be
What happens to hydrogen during hydrogen bonding?
a)The proton spends a lot of time away from hydrogen and hydrogen's electron is exposed for interaction
b)The electron spends a lot of time away from hydrogen and hydrogen's electron is exposed for interaction
c)The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction
d) The proton spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction
Now you will focus on a second hypothesis. This hypothesis can be very similar to the first, but this time you want to focus only on the second variable in question, speed. What could be a hypothesis that would illustrate the relationship between speed and kinetic energy? Use the format of "if…then…because…” when writing your hypothesis.
Answer:
If the mass of an object increases, then its kinetic energy will increase proportionally because mass and kinetic energy have a linear relationship when graphed.
Explanation:
is correct answer
Answer:
Sample Response: If the speed of an object increases, then its kinetic energy will increase proportionally because speed and kinetic energy have a linear relationship when graphed.
Explanation:
The yard cat above is named "Yardley" for reasons obvious to his owner.
Yardley spends most of his time lounging in the back yard chasing
carpenter bees. But he could have been given any number of names
based on his appearance or behavior. Think for a few minutes. What
would you name him if he were your cat?
Answer:
For a cat name does matter as it keeps a charm when ever we call the name out. So it needs to be cherished as by a name so if it was me i would name it as Chinky.
How many moles are 21.67 L of NH4CI?
Type your answer...
Answer:
0.967mole
Explanation:
Given parameters:
Volume of NH₄Cl = 21.67L
Unknown:
Number of moles = ?
Solution:
We assume that the volume was taken at standard temperature and pressure,
Then;
Number of moles = [tex]\frac{volume }{22.4L}[/tex]
Number of moles = [tex]\frac{21.67}{22.4}[/tex] = 0.967mole
The products of chemical industries that are used to care for the skin and make people look more attractive are
Answer:
Cosmetics
Explanation:
The products of chemical industries that are sued to care for the skin and make people more attractive are cosmetics.
Cosmetics are chemical products used for beauty enhancement.
A broad range of materials or substances are generally grouped as cosmetics. They are often classified as health and beauty products. To make cosmetics, some natural products are used in combination with artificial materials that have synthesized. Examples are deodorants, perfumes, lip stick, lip gloss etc.3. The two main driving forces of the water cycle are the Sun and...
1 gravity
2 wind
3 volcanoes
4 rain
Consider the reaction below.
2 Na + O2 → Na2O2
If 10.0 g of sodium metal reacts with excess oxygen gas how many grams of sodium oxide will be produced?
Show your work below. Make sure to show ALL units and each step of the process:
Answer:
I think 5
Explanation: