Semester Review

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

What happens to clothes when they come out of the dryer and stick together?

Back

They have become electrically charged.

Front

In the reaction 2S + 3O2 -> 2SO3, how many atoms of oxygen are in the reactants?

Back

There are 6 atoms of oxygen in the reactants.

Front

What is a particle with a negative charge called?

Back

Electron.

Front

In which direction does electrical current flow?

Back

Negative to Positive.

Front

What is the definition of 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 an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the pH scale used for?

Back

The pH scale is used to measure the acidity or basicity of a solution.