Unit 2 Assessment

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products) with different properties.

Front

What does it mean for mass to be conserved in a chemical reaction?

Back

The total mass of reactants equals the total mass of products; mass is neither created nor destroyed.

Front

What is a model in science?

Back

A representation of an object or system that helps to explain and predict its behavior.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence includes color change, temperature change, gas production, or formation of a precipitate.

Front

What is a prototype?

Back

An initial model or version of a product used to test and refine ideas.

Front

What is an open system in chemistry?

Back

A system that can exchange both matter and energy with its surroundings.

Front

What is a closed system in chemistry?

Back

A system that can exchange energy but not matter with its surroundings.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings, resulting in a temperature drop.

Front

What is an exothermic reaction?

Back

A reaction that releases heat to its surroundings, resulting in a temperature increase.

Front

What is the difference between an endothermic and exothermic reaction?

Back

Endothermic reactions absorb heat (feel cold), while exothermic reactions release heat (feel hot).