2nd 9wks Study Guide

Front

What are the substances that have the same number of oxygen atoms?

Back

Substances 1 & 4 have the same number of oxygen atoms.

Front

Is melting wax a physical or chemical change?

Back

Melting wax is a physical change.

Front

What does the '2' in the chemical formula CaCl2 indicate?

Back

The '2' indicates there are 2 chlorine atoms.

Front

Define an exothermic reaction.

Back

An exothermic reaction is a chemical reaction that releases thermal energy.

Front

What is the range for acids on the pH scale?

Back

The range for acids on the pH scale is 0-6.

Front

What is a chemical change?

Back

A chemical change is a process where substances transform into different substances with new properties.

Front

What is the pH scale used for?

Back

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

Front

What is an ionic compound?

Back

An ionic compound is formed when atoms transfer electrons, resulting in charged ions.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition, while chemical changes do.

Front

What is the formula for calculating pH?

Back

pH = -log[H+], where [H+] is the concentration of hydrogen ions.