Topic 1: Matter, Properties of Water, Acids & Bases

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include saltwater and air.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

How many types of atoms do elements have?

Back

Elements have only 1 type of atom.

Front

What happens to the pH when a strong base is added to pure water?

Back

The pH raises.

Front

What are examples of elements?

Back

Helium and Oxygen are examples of elements.

Front

Does soap decrease the surface tension of water?

Back

Yes, soap decreases the surface tension of water.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform throughout. Examples include salad and sand.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a solution and has a pH less than 7. Examples include hydrochloric acid (HCl) and sulfuric acid (H2SO4).