Review - MC 1

Question refers to aqueous solutions containing 1:1 mole ratios of the following pairs of substances. Assume all concentrations are 1 M.

1. A buffer with a pH less than 7

• sodium hydroxide and ammonia

• sodium hydroxide and hydrochloric acid

• hydrobromic acid and potassium bromide

• acetic acid and sodium acetate

• methylammine and methylammonium chloride

A gas at a volume of 4 liters is at a pressure of 8 Pa. The volume is changed to 16 Liters, what must the new pressure be?

• 1 Pa
• 12 Pa
• 10 Pa
• 2 Pa

This graph is an example of two variables that are:

• directly proportional
• inversely proportional
• Straight line
• No relation

4.50 L of a gas has a pressure of 760.0 mmHg; what would the new volume be at 200.0 mmHg? (assuming constant temperature and amount)

• 1.18 L
• 1.180 L
• 17.1 L
• 17.10 L

Which container will have a lower pressure?

• left
• right
• they both have the same pressure
• I don't know

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Determine the Kelvin temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure. 

• 0 K 
• 107 K 
• 207 K 
• 307 K 

Each of these flasks contains the same number of molecules. In which container is the pressure highest?

• Flask 1
• Flask 2
• Flask 3
• Flask 4

A reaction that releases energy is called?

• exothermic
• endothermic
• hypothermic
• hyperthermic

Tags

NGSS.HS-PS1-4

Energy stored in the chemical bonds of the substance is called?

• kinetic energy
• chemical potential energy
• heat

Tags

NGSS.HS-PS1-4