2.3-Elements and Compounds - 1

What is table sugar sometimes called?

• Fructose

• Sucrose

• Glucose

• Lactose

What is a compound?

• A single element

• A mixture of elements

• Made up of two or more elements chemically combined

• A mixture of compounds

Elements in a compound are chemically combined in a ____ proportion.

• Variable

• Fixed

• Random

• Unpredictable

Compounds ____ broken down into simpler substances by chemical means.

• Can be

• No, never

• Sometimes

• Cannot be

Which of the following is an example of an element?

• Water

• Oxygen

• Table sugar

• Carbon dioxide

What is a chemical change?

• A change in temperature

• A change in state

• A change in which the properties of a substance change OR a new substance is formed

• A change in shape

When electricity passes through water, what gases are produced?

• Oxygen and nitrogen

• Nitrogen and carbon dioxide

• Oxygen and hydrogen

• Hydrogen and helium

Hydrogen is a gas that burns in the presence of ____.

• Carbon dioxide

• Nitrogen

• Oxygen

• Helium

What is an element?

• A complex form of matter

• A combination of compounds

• The simplest form of matter with unique properties

• A mixture of substances

Elements ____ broken down into simpler substances by chemical means.

• Can be

• Cannot be

• Sometimes

• Only in specific conditions