Solutions and Equilibrium

A beaker containing 80 grams of lead(II) nitrate, Pb(NO₃)₂, in 100 grams of water has a temperature of 30 ºC. Approximately how many grams of the salt are undissolved, on the bottom of the beaker?

• 20 grams
• 80 grams
• 66 grams
• 14 grams

Tags

NGSS.HS-PS1-5

Which salt is LEAST soluble at 0 ºC?

• K₂Cr₂O₇
• KNO₃
•  KClO₃
• Ce₂(SO₄)₃

Tags

NGSS.HS-PS1-5

Which of these is most likely to be a gas?

• Ce₂(SO₄)₃

• KClO₃

• K₂Cr₂O₇

• KNO₃

Tags

NGSS.HS-PS1-5

Consider the following reaction:
2SO_2(g) + O_2(g) ⇄ 2SO_3(g) +  197 kJ/mol Which of the following will not shift the equilibrium to the right?

• Adding more O₂
• Adding a catalyst
• increasing the pressure
• Lowering the temperature

What volume is needed to make a 2.5 M solution if you have 240g of Sodium Hydroxide?

• 6

• 0.42

• 15

• 2.4

For the reaction...

Energy + N₂ + O₂ <−> 2NO

If the heat is added to the chemical system, the equilibrium will shift _______.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which will dissolve the fastest?

• block of salt in cold water
• block of salt in hot water
• table salt in cold water
• table salt in hot water

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

When you raise the temperature, what happens to solvent-solute collisions?

• less frequent and more energetic
• more frequent and more energetic
• less frequent and less energetic
• more frequent and less energetic

Tags

NGSS.HS-PS1-5

As you increase the pressure of a gas, its solubility in a liquid will

• decrease
• increase
• stay the same
• pressure has no effect on the solubility of a gas in a liquid

If I make a solution by adding water to 27.72 g of methanol (CH₃OH) until the final volume of the solution is 275 mL, what is the molarity of methanol in this solution?

• 5.66 M CH₃OH
• 3.13 M CH₃OH
• 0.77 M CH₃OH
• 2.19 M CH₃OH