Chemical Reactions Unit Test Part 5 41-50

Front

What type of reaction releases heat into the surroundings?

Back

Exothermic reaction: A chemical reaction that releases energy in the form of heat.

Front

What is an endothermic reaction?

Back

Endothermic reaction: A chemical reaction that absorbs heat from the surroundings.

Front

Define a chemical reaction.

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant?

Back

Reactant: A substance that takes part in and undergoes change during a reaction.

Front

What is a product in a chemical reaction?

Back

Product: A substance that is formed as a result of a chemical reaction.

Front

What is a catalyst?

Back

Catalyst: A substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is the difference between a physical change and a chemical change?

Back

Physical change: A change that affects one or more physical properties of a substance without altering its chemical composition. Chemical change: A change that results in the formation of new chemical substances.

Front

What is an example of an exothermic reaction?

Back

Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic reaction.

Front

What is an example of an endothermic reaction?

Back

Photosynthesis in plants is an example of an endothermic reaction, where plants absorb sunlight to convert carbon dioxide and water into glucose.