3rd Qtr Makeup Class Grade

When new chemical bonds form, energy ____________.

• is taken into the system.

• is released from the system.

• stays the same in the system.

Does breaking bonds require energy, release energy, or not involve energy at all?

• requires energy to break

• releases energy when broken

• No energy involved

Temperature is a measure of average [blank] energy of individual atoms.

• heat
• potential
• mechanical
• kinetic

Which phase of matter has the greatest motion and least orderly arrangement?

• solid
• liquid
• gas

What is the Law of Conservation of Energy?

• Energy is equal to reactants and products

• Energy can be created nor destroyed

• Energy is used up but it can be replenish

• Energy is conserved and preserved

A solute dissolves in water and gets cold.

• Exothermic with positive ΔH

• Exothermic with negative ΔH

• Endothermic with positive ΔH

• Endothermic with negative ΔH

Which of the following is the correct formula for calculating molarity?

• moles/liters of solution

• moles/kg of solvent

• # particles/Avogadro's #

• theoretical yield/actual yield

What is a solvent?

• The substance that does the dissolving in a solution.
• The substance that is being dissolved in a solution.
• The mixing of different substances.
• The process in which neutral molecules lose or gain electrons

Another name for a homogeneous mixture is 

• an element.
• a solution.
• a compound.

Electrolytes

• don't conduct electricity

• conduct electricity