# Benchmark 4 Review!!!: Question Preview (ID: 31793)

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**For equation B, if you make 10 moles of Na2O, how many GRAMS of oxygen gas did you use?**

a) 5 grams

b) 160 grams

c) 80 grams

d) 6.4 grams

**Which gas would effuse the SLOWEST?**

a) C

b) N2

c) Mg

d) Al

**For equation B, if you produce 16 moles of Na2O, how much sodium did you use?**

a) 32 moles

b) 8 moles

c) 2 moles

d) 16 moles

**For equation B, if you have 5 moles of oxygen gas, how many moles of Na2O will you make?**

a) 5 moles

b) 2.5 moles

c) 10 moles

d) 0.4 moles

**A sample of an ideal gas at 171°C and 4.0 atmospheres has a volume of 4.5 Liters, how many moles of the gas does the sample contain?**

a) 2.025 moles

b) 0.494 moles

c) 36.4524 moles

d) 18 moles

**A gas has a constant temperature. The starting pressure is 4 atm and takes up a volume of 15 L. If the new pressure is 6 atm, what is the new volume?**

a) .0444 L

b) 1.6 L

c) 22.5 L

d) 10 L

**Which of the following would effuse the FASTEST?**

a) P

b) Br

c) Al

d) Mg

**In this equation A what is the acid?**

a) NH4OH

b) HCl

c) NH4Cl

d) H2O

**For equation A, what is the salt created?**

a) NH4OH

b) HCl

c) NH4Cl

d) H2O

**For equation B, how many grams of sodium would react with 3 moles of oxygen gas?**

a) 132 grams

b) 0.52 grams

c) 276 grams

d) 1.92 grams

**For equation B, if you are given 44 grams of sodium, how many moles of product can you make?**

a) 22 moles

b) 0.96 moles

c) 3.8 moles

d) 0.475 moles

**If you have 4.5 moles of salt and dissolve it in 400 mL of water, what is the molarity?**

a) 11.25 M

b) 0.01125 M

c) 0.089M

d) 89 M

**I give you 1,000mL of a solution and you drop in 54 grams of aluminum, what is the molarity?**

a) 54M

b) 0.054M

c) 2M

d) 0.002 M

**When you double the temperature, what happens to the pressure?**

a) cut in 1/2

b) doubles

c) nothing

d) cut by 1/4

**Which of the following is not a unit for pressure?**

a) atm

b) torr

c) mmHg

d) mL

**If I keep the temperature constant and make my pressure go from 5atm to 15 atm, what happens to my volume?**

a) triples

b) doubles

c) cut by 1/2

d) cut by 1/3

**d. If I have an unknown quantity of gas at a pressure of 0.5 atm, a volume of 25 liters, and a temperature of 300 K, how many moles of gas do I have?**

a) 0.508 moles

b) 2.05 moles

c) 20 moles

d) 34 moles

**When you add an acid to a base which of the following DOES NOT HAPPEN?**

a) make a salt

b) make a weaker acid

c) make water

d) a chemical reaction takes place

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