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lawyer [7]
3 years ago
12

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry
1 answer:
Novosadov [1.4K]3 years ago
6 0

1.) Which of the following is a molecule but not a compound?

A.He

"He" or helium is an initial for a single element and a compound has more than one element.

2.) What is a physical combination of substances?

A.a mixture

When two substances are combined they result in a compound.

3.) What is a chemical combination of substances?

A. they form a compound

When two chemical elements are combined they form a compound.

4.) What is the relationship between the solute and solvent in a solution?

B.they form a mixture

Solutes are dissolved into the solvent which results in a mixture.

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At constant temperature a bicycle tire pump contains 252mL of air at 995kPa pressure. The plunger of the pump is pushed down unt
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Answer:

The new pressure of the pump is 26.05 atm or 2639.4 kPa

Explanation:

Step 1: Data given

Volume of the bicycle tire pump = 252 mL = 0.252 L

Pressure of air = 995 kPa = 9.81989 atm

The volume of the pump is reduced to 95.0 mL = 0.095 L

Step 2: Calculate the new pressure

V1*P1 = V2*P2

⇒with V1 = the initial volume of the bicycle tire pump = 0.252 L

⇒with P1 = the initial pressure of the pump = 9.81989 atm = 995 kPa

⇒with V2 = the reduced volume of the pump = 0.095 L

⇒with P2 = the new pressure = TO BE DETERMINED

0.252 L * 9.81989 atm = 0.095 L * P2

P2 = 26.05 atm

The new pressure is 26.05 atm

OR

0.252 L * 995 = 0.095 L * P2

P2 = 2639.4 kPa

The new pressure of the pump is 26.05 atm or 2639.4 kPa

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