Answer:
The elements in Group 1 (lithium, sodium, potassium, rubidium, cesium, and francium) are called the alkali metals. All of the alkali metals have a single s electron in their outermost principal energy. ... For example, the electron configuration of lithium (Li), the alkali metal of Period 2, is 1s22s1.
Answer:
they have a mono positive charge of +1
Explanation:
this is due to having one electron in their outermost ns orbital
It’s due in 3 minutes please help
Answer:
The Answer is gonna be Indroduction of non-native plant species
difference between vegetative and reproductive part
Answer:
The vegetative parts includes the roots, stems,leaves and the reproductive parts include flowers. ... The vegetative parts can reproduce new plants by the process of vegetative propagation but the reproductive parts cannot produce new plants directly instead they produce precursor of new plants that are seeds or fruits.
SO2 + PCL5 → SOCL2 + POCL3
What mass of SOCL2 is produced when 1.35 g SO2 react with 2.75 g PCL5
Answer:
2.34
Explanation:
how many grams of Na2SO4, (molar mass =142.0 g/mol) are there in 15 mL of 0.50 m Na2SO4 solution?
Answer:
1.1 g Na2SO4
Explanation:
First convert mL to L. Then multiply by the Molarity to get moles, then multiply by the molar mass to get grams.
15 mL x 1 L x 0.50 mol Na2SO4 x 142 g = 1.1 g
10^3 mL 1 L mol Na2SO4
In a formula unit, there are 48 gram of Na2SO4 atoms of each element. In terms of molar mass (gram mass unit): 45.98 g Na2SO4 in total 142.04 g sodium sulphate
How many moles of Na2SO4 are there?A mole of sodium sulphate is created when two moles of sodium (45.98 g), one mole of sulphur (32.06 g), and four moles of oxygen (64.00 g) are combined (142.04 g).
The atomic mass of sodium sulphite is equal to 10 moles times the molecular mass, or 1260 grams. Consequently, 1260 grams are the mass of 10 moles of sodium sulphite (Na2SO4).
We first obtain the atomic weights of the different elements in a periodic table in order to compute the molar mass of a molecule. Then, we multiply the total number of atoms by each one's atomic mass. Finally, we calculate the molar mass by combining all the atomic masses.
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When 3.52 g of bismuth oxide (molar mass - 465.96 g/ml) reacts with excess carbon to form 2.91 g of bismuth metal (molar mass-208.98) according to the equation:
Bi2O3(s) + 3C(s) = 2 Bi(s) + 3 CO(g)
24
What is the percent yield of the reaction?
(Answer to 1 decimal place)
25
Is vinegar and rubbing alcohol soluble or insoluble?
A chemist weighed out 7.22 g of silver. Calculate the number of moles of silver she weighed out.
Be sure your answer has the correct number of significant digits.
Answer:
0.067 mole Ag°
Explanation:
Given 7.22 g Ag° = 7.22g Ag/ 107.8g/mol = 0.0670 mole Ag° (3 sig. figs.)
A compound with an approximate molar mass of
65.0g/mol is made up of C, H and Cl. This same
Compound contains 55% of Cl by mass .lf 9g
of the compound contains 4.19 x 10²³ atoms,
determine the compound's:
a empirical formular and molecular formular
The atomic musses of N (99. 64 percent) and 1N (0.36 percent) are 14.00307 amu and 15.0001 amu, respectively. Calculate the average atomic mass of nitrogen. The percentages in parentheses denote the relative abundances C01?
Answer:
14.01 amu
Explanation:
Step 1: Given data
Isotope Atomic mass (am) Abundance (ab)
¹⁴N 14.00307 amu 99.64% (0.9964)
¹⁵N 15.0001 amu 0.36% (0.0036)
Step 2: Calculate the average atomic mass (aam) of nitrogen
We will use the following expression.
aam = ∑ am × ab
aam = 14.00307 amu × 0.9964 + 15.0001 amu × 0.0036 = 14.01 amu
How many atoms are there in two molecules of water?
a. 3
b.4
c.5
d.6
Answer:
the answer is 4
Explanation:
your welcome lol
Why is it expensive to bring electricity into urban areas?
Answer:
Power plants are not located in cities. Power has to travel a long distance over power lines to reach cities.
Explanation:
Which type of formula shows an element symbol for each atom and a line for each bond between atoms?
structural
molecular
empirical
ionic
Answer: structural
Explanation:
When metals and non metals combine in fixed proportion then a chemical compound is formed. Structural formula shows an element symbol for each atom and a line for each bond between atoms. The correct option is option A.
What is chemical formula?Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral.
Out of given structural is a 3D representation of any chemical formula, in which symbol of each element is shown .Along with symbol line for each bond between atoms is also shown.
Therefore, the correct option is option A.
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Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M to give 500 mL of solution. A 15.00-mL aliquot was then diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 327 on an arbitrary scale. A standard 100 ppm quinine solution registered 180 when measured under conditions identical to those for the diluted sample. Calculate the mass of quinine in milligrams in the tablet.
Answer:
605.6mg of quinine
Explanation:
Based on Lambert-Beer's law, the intensity of an optical measurement is directely proportional to its concentration.
Unknown concentration gives a reading of 327
100 ppm gives 180 of intensity
The concentration of the diluted quinine tablet is:
327 * (100ppm / 180) = 181.67 ppm. The final dilution
The concentration of the first diluted solution is:
181.67 ppm * (100.0mL / 15mL) = 1211ppm
ppm could be defined as mass of solute (In this case of quinine) in mg per liter of solution. That is:
1211mg / L
As the tablet was diluted to 500mL = 0.5L, the mass of the quinine is:
0.5L * (1211mg / L) =
605.6mg of quinineA hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place
over the next few minutes?
Molecules in both the metal and the surrounding air will start moving at lower speeds.
Molecules in both the metal and the surrounding air will start moving at higher speeds.
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
molecules will speed up
Explanation:
Joaquin's doctor tested Joaquin's reflexes by tapping his knee. The doctor
explained to Joaquin that the tapping sends a signal to his spinal cord. The
spinal cord then sends a signal to the muscle in Joaquin's thigh, and his leg
moves. Which of the following body systems is involved in this process?
A. Respiratory system
B. Nervous system
C. Skeletal system
D. Digestive system
Answer: Skeletal System
Explanation: Sense It's Sending up a signal up Joaquin's spinel cord It must be traveling threw his skeletal system
Answer:
its the nervous system because by tapping the knee, it will send a nerve down the neuron, through the mylein sheath and through the axon terminals to the receptors, which will recieve the nerve's signal and send it to the brain through the spinal cord in simple terms.
can someone help me???
Answer:
Waning Crescent
Explanation:
Hope iT Help
Brainliest please
A mixture of NO2 and N2O4 gas is at equilibrium in a closed container. These gases react with the equation 2NO2 ⇌ N2O4. What will happen if the size of the container is increased?
Answer:
Equilibrium will shift leftwards towards NO2.
Explanation:
Hello there!
In this case, according to the Le Cha telier's principle, it is possible to realize that the increase of the volume turns out in the shift towards the most of the gaseous moles are in; in such a way, for the given chemical reaction, we can notice how NO2 (reactant side) has the most of the moles (2 moles in comparison to 1 mole of N2O4); and therefore, by increasing the volume, the equilibrium will shift to it, it means leftwards.
Best regards!
What is the molarity of a solution created by adding 0.75 moles of lithium fluoride to 65 L of solution?
Answer:
Molarity=Moles of solute/volume of solution in Litres
Simply imputing your values
you have
0.75/65
0.0115M.
2. Water is an excellent solvent. With water being a polar
molecule, it can be an especially strong solvent for other
polar molecules. Give an example of how water acting as a
solvent is important for living organisms.
NO LINKS PLZ HELP
Answer:
Water acts as a solvent of carbon dioxide excreted from tissues, in blood and helps in regulating pH (because it forms carbonic acid that lowers pH when it tends to get higher). Blood pH should be maintained at about 7.4. One major reason is that the structure of protein is dependent ton pH because pH determines its ionization hence also affecting the charges and interaction between side groups of amino acids. A change in pH may, therefore, denature proteins and negatively affect cellular functions.
Explanation:
To get more on how water acts as a universal solvent check out brainly.com/question/7007192
How are compositional layers distinguished?
Explanation:
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.Information about the compositional layers
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.Information about the compositional layersLayer Definition Depth
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.Information about the compositional layersLayer Definition DepthCrust :The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle. 0-100km silicates
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.Information about the compositional layersLayer Definition DepthCrust :The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle. 0-100km silicatesMantle :A layer of the Earth (or any planet large enough to support internal stratification) between the crust and the outer core. It is chemically distinct from the crust and the outer core. The mantle is not liquid. It is, however, ductile, or plastic, which means that on very long time scales and under pressure it can flow. The mantle is mainly composed of aluminum and silicates. 100-2900km iron and magnesium silicates
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.Information about the compositional layersLayer Definition DepthCrust :The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle. 0-100km silicatesMantle :A layer of the Earth (or any planet large enough to support internal stratification) between the crust and the outer core. It is chemically distinct from the crust and the outer core. The mantle is not liquid. It is, however, ductile, or plastic, which means that on very long time scales and under pressure it can flow. The mantle is mainly composed of aluminum and silicates. 100-2900km iron and magnesium silicatesCore: The innermost layers of the Earth. The Earth has an outer core (liquid) and an inner core (solid). They are not chemically distinct from each other, but they are chemically distinct from the mantle. The core is mainly composed of nickel and iron. 2900-6370km meta
Obsidian _____.
is formed from sand and quartz
cools very quickly
has large mineral crystals
cools very slowly
Answer:
Cools Very Quickly
Explanation:
This is the right answer!
An exothermic reaction
In an endothermic reaction, the energy of the products is
the energy of the reactants.
Activation energy is
the potential energy of the products.
Answer:
An exothermic reaction
✔ produces energy
.
In an endothermic reaction, the energy of the products is
✔ more than
the energy of the reactants.
Activation energy is
✔ always greater than
the potential energy of the products
Answer:
Produces energy
More than
Always greater than
Explanation:
8. The density of a gas at 350 C is 0,087 g/L. Compute the density at STP.
Answer:
0.20 g/L
Explanation:
Step 1: Calculate the molar mass of the gas (M)
At T = 350 °C = 623 K and P = 1 atm (we will assume this data), the density (ρ) of the gas is 0.087 g/L. We can calculate the molar mass of the gas using the following expression.
ρ = P × M/R × T
M = ρ × R × T/P
M = 0.087 g/L × (0.0821 atm.L/mol.K) × 623 K/1 atm = 4.5 g/mol
Step 2: Calculate the density of the gas at STP
At standard temperature (T = 273.15 K) and standard pressure (P = 1 atm), the density of the gas is:
ρ = P × M/R × T
ρ = 1 atm × 4.5 g/mol /(0.0821 atm.L/mol.K) × 273.15 K = 0.20 g/L
Help please I’ll mark as brainiliest
Answer:
B B
W BW BW
W BW BW
Explanation:
Hope this helps
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
Answer:
0.917 L
Explanation:
Step 1: Given data
Molar concentration of the solution (M): 0.530 M (0.530 mol/L)Mass of Ca(OH)₂ (solute): 36.0 gStep 2: Calculate the moles corresponding to 36.0 g of Ca(OH)₂
The molar mass of Ca(OH)₂ is 74.09 g/mol.
36.0 g × 1 mol/74.09 g = 0.486 mol
Step 3: Calculate the volume of the solution
Molarity is equal to the moles of solute divided by the liters of solution.
M = moles of solute / liters of solution
liters of solution = moles of solute / M
liters of solution = 0.486 mol / (0.530 mol/L) = 0.917 L
Answer:
0.917 liters
Hope this helps! :D
Explanation:
5.
(08.02 MC)
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
What does the esophagus connect?
the intestine to the colon
the intestine to the mouth
The stomach to the intestine
the mouth to the stomach
Answer: it think it would be last one. the mouth to the stomach is the answer.
Explanation:
Answer:
The correct answer is D! The esophagus connects the mouth to the stomach.
Explanation:
The mouth is connected to the esophagus, which in turn is connected to the throat. The throat, in turn, connects the mouth to the stomach.
I had this on a science test and I got it right :D
I hope this helps! ;)
QUESTION 13
What is the boiling point of a 0.50 m aqueous solution of Al(NO 3) 3?
(The boiling point elevation constant for water is 0.512 °C/m.)
O a. 100.51 °c O b. 101.02 °c O C. 102.05 °C 0 d. 106.60 °C
Answer:
b. 101.02°C
Explanation:
The elevation of boiling point in a solvent due the addition of a solute is a colligative property called Boiling point Elevation. The formula is:
ΔT = Kb*m*i
Where ΔT is change in boiling point
Kb is boilinig point elevation constant = 0.512°C/m for water
m is molality of the solution = 0.50m
And i is Van't Hoff Factor (4 for the Al(NO₃)₃ because its disolution produce 4 ions)
Replacing:
ΔT = 0.512°C/m*0.50m*4
ΔT = 1.02°C
As the boiling point of pure water is 100°C and the increasing is of 1.02°C, boiling point of the solution is:
101.02°C
Right option is:
b. 101.02°C
Water pollution has severely impacted animals and plants in New York's Hudson
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Check my work
Enter your answer in the provided box.
The pressure inside a 1.0 L balloon at 25°C was 750 mm Hg. What is the pressure (in mmHg) inside the
balloon when it is cooled to -65°C and expands to 3.3 L in volume?
mm Hg
Answer:
shhsss×<×>×××<××××
Explanation:
4×738×8<#329×
PLEASE HELP WILL MARK BRAINLEST!!!
Answer:
C. i don't kow
Explanation: