Chapters 9&10

A chemical reaction in which heat energy is required/absorbed is

• endothermic

• exothermic

• thermogenic

• combustion

What should go in the blank to balance the following: 2Mg + O2 --> ___ MgO

The subscript in a chemical equation is written

• as a large number before a compound/element.

• The subscript in a chemical equation is written

• before a compound/element to represent division.

• as a small number, following a compound/element.

Water is a specific type of molecule that helps it with bonding. What type of molecule is it?

An __________ is a catalyst that speeds up chemical reactions in living cells.

Which of the following would not influence reaction rates?

• Temperature

• Color

• Pressure

• Surface area

Based on what we have learned about phenolphthalein what could you predict about the two solutions seen in the picture.

• The one on the left is very basic and the one on the right is likely neutral.

• The one on the left is most likely a weak acid and the one on the right is a strong acid.

• The one on the left is more likely to be neutral or a bit acidic and the one on the right is very basic.

TRUE or FALSE? For an equation to be balanced, you must have the same number of each element on both sides of the equation. Just put the first letter.

___________slow down chemical reactions.

• reactant

• catalyst

• inhibitors

• product

Precipitate

• A change in a substance that does not involve a change in the identity of the substance

• A process in which one or more substances are changed into others

• A solid that forms from a solution during a chemical reaction.

• When a substance bubbles