GC2_Thermochemistry Day 1

Multiple Choice

Energy that transfers from one substance to another until the temperatures are equal is called...

• Free energy

• Temperature

• Entropy

• Heat

Multiple Choice

Which of the following describes the heat transfer when you hold an ice cube in your hand?

• from the cold ice cube to your warm hand

• the cold ice cube makes your hand cold

• from your warm hand to the cold ice cube

• no heat transfer occurs

Multiple Choice

The SI unit of heat and energy is the _________.

• Calorie

• Becquerel

• Joule

• Watt

Multiple Choice

What unit do you use to measure heat?

• $$J/KgºC$$

• Kg

• $$\degree C$$

• J

Multiple Choice

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The final temperature is lower than the original temperature.

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Multiple Choice

Do reactants in an endothermic reaction have a higher or lower energy than the products?

• Higher

• Lower

Multiple Choice

In an endothermic reaction, heat is ...

• Released

• Absorbed

Multiple Choice

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• Reactant

• Product

Multiple Choice

Is the following process exothermic or endothermic?

• Endothermic

• Exothermic

Multiple Choice

What kind of thermochemical equation is this: $$2\ KI\ +\ MgCl_2\ +\ 200\ kJ\ \rightarrow\ 2\ KCl\ +\ MgI_2$$

• Endothermic

• Exothermic

Multiple Choice

A sunflower makes food (sugar) during photosynthesis.

• Endothermic

• Exothermic

Multiple Choice

Atoms tend to stabilize when they form chemical bonds, releasing energy in the process. This process belongs to...

• Endothermic

• Exothermic

Multiple Choice

Ice cubes in your glass of soda melt.

• Endothermic

• Exothermic

Multiple Choice

Baking pizza in the oven.

• Endothermic

• Exothermic

Multiple Choice

The initial temperature was measured to be 20℃ and the final temperature was at 10℃. The reaction was...

• Endothermic

• Exothermic

Multiple Choice

Heat of reactants = 700J

Heat of products = 900J

The reaction was...

• Endothermic

• Exothermic