CHEMISTRY HIGH SCHOOL

In the electron cloud model, if you begin at the electron shell closest to the nucleus of an atom and move out, what is the number of electrons that each energy level or electron shell needs to fill the first four electron shells?A. 2, 6, 10, 14
B. 2, 8, 18, 32
C. 8, 8, 8, 8

Answers

Answer 1
Answer: Option B: 2, 8, 18, 32.

2 in the K shell, 8 in L shell, 18 in M shell and 32 in N shell.

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Which of the following events on the sun affects the Earth in either a direct or indirect way?A. Corona mass ejection or CMEs only
B. Solar flares only
C. Solar systems only
D. All of the above

Answers

Answer:

Explanation:

D

Sawing a board in half is an example of a chemical change

Answers

Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.

An inherited behavior that helps an animal meet its needs

Answers

Answer:

the answer is adaptations

Explanation:

A body part or behavior that helps an animal meet its need in its environment is called an adaptation. All adaptions are inherited traits. Camouflage is an animal's color or pattern that help it blend in with its surroundings.

A student is running an experiment in which 60.3 grams of LiCl is needed, but the only jar of reagent in the lab is labelled lithium chloride monohydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?

Answers

Answer:

Mass of the hydrated salt required is 85.8 g

Explanation:

Molar mass of anhydrous lithium chloride = 42.5 g/mol

Molar mass of lithium chloride monohydrate = 60.5 g/mol

Mass of water molecule in the hydrated salt = 18 g/mol

Ratio of lithium chloride to water molecule in the hydrated salt = 42.5 : 18

Mass of water molecule in the hydrated salt that will contain 60.3 g of lithium chloride = 60.3/42.5 × 18 g = 25.5 g

Therefore mass of hydrated salt required = (60.3 + 25.5) g = 85.8 g

The student will have to weigh out 85.8 g of the hydrated salt, and then heat the salt in an evaporating dish until it decomposes to liberates all the water of hydration in order to obtain the anhydrous salt.

What is the mass of 3.0 x 10^23 atoms of neon

Answers

The mass of 3.0 x 10^23 atoms of neon would be 10.09 g

According to Avogadro;

1 mole of neon would have 6.022 x 10^23 atoms

3.0 x 10^23 atoms of neon would have:

            3.0 x 10^23/6.022 x 10^23

                                         = 0.5 moles

mass of 0.5 moles neon = mole x molar mass

                                            = 0.5 x 20.18

                                             = 10.09 g

More on Avogadro number can be found here: brainly.com/question/1445383?referrer=searchResults

Answer: The mass of neon for the given number of atoms will be 9.8 g.

Explanation:

We are given:

Number of neon atoms = 3.0* 10^(23)

According to the mole concept:

6.022* 10^(23) number of atoms. are occupied in 1 mole of a substance.

So, 3.0* 10^(23) will be occupied in = (1)/(6.022* 10^(23))* 3.0* 10^(23)=0.49moles

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of Neon = 0.49 moles

Molar mass of neon = 20 g/mol

Putting values in above equation, we get:

0.49mol=\frac{\text{Mass of neon}}{20g/mol}\n\n\text{Mass of neon}=9.8g

Hence, the mass of neon for the given number of atoms will be 0.49g.

What is the compound name for P4Br8

Answers

Tetra phosphorous octa bromide is the compound name for P4Br8.

What is compound?

A substance is from a combination of two or more different chemical elements. They are pure chemical substances found in nature.

  • The smallest unit of a compound is molecule.
  • Both phosphorous and bromide are on the right side of the periodic table.
  • Both phosphorous and bromide form covalent bond.
  • Atomic weight of phosphorous is 30.97 and atomic number is 15.
  • Atomic weight of bromine is 79.9 and atomic number is 35.

The name is tetra because there are 4 phosphorous and octa means there is 8 bromide.

The ratio of phosphorous and bromide is 4:8.

Tetra phosphorous octa bromide is the compound name for P4Br8.

Learn more about compounds here:

brainly.com/question/14658388

#SPJ6
These are both on the right side of the periodic table, so they bond covalently.The name would be TETRAphosphorous OCTAbromide. Tetra because there are 4 phosphorus molecules, and octa because there re 8 bromine molecules
Hope that helps!
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