Chemistry Review 1

What compound is magnesium chloride?

• MCl₂
• MCl
• MgCl
• MgCl₂

An ethylene gas torch requires 3200 L of gas at 3.00 atm. What will be the pressure of the gas if ethylene is supplied by a 250.0 L tank?

• 0.231 atm
• 2.34 atm
• 38.4 atm
• 45.4 atm

A helium-filled balloon has a volume of 50.0 L at 25°C and 1.08 atm. What volume will it have at .855 atm and 10.0°C?

• 15.0 L
• 30.0 L
• 60.0 L
• 120 L

What is the magnitude of the ideal gas constant in atmospheres?

• 0.0831
• 0.0821
• 8.31
• 8.21

How many moles of steam are produced at 2.00 atm and 202.0°C by the complete combustion of 12.50 L of methane gas? 

• 0.001 mol
• 0.012 mol
• 0.640 mol
• 1.28 mol

A 40.0-L sample of fluorine is heated from 90.0°C to 186.0°C. What volume will the sample occupy at the higher temperature? 

• 19.3 L
• 31.6 L
• 50.5 L
• 82.6 L

Which change in state requires that energy be added to the substance? 

• freezing
• deposition
• condensing
• vaporizing

Which is defined as the combination of pressure and temperature at which all three states of matter can coexist at equilibrium?

• critical point
• triple point
• melting point
• deposition point

Which is the correct number of valence electrons in the element Sulfur (S)? 

• 6
• 16
• 4
• 2

How many total atoms are in 4 Ca₃(PO₄)₂? 

• 20
• 36
• 40
• 52