RF TCAP Review

Which represents the smallest part of an element that retains all the properties of that element?

• molecule

• atom

• nucleus

• proton

A student examines a powder. He notices most of the powder is made of white grains, but black grains are also present. The powder should be classified as

• an atom

• an element

• a mixture

• a compound

The most basic unit of matter in the composition of an apple is

• a molecule

• a tissue

• an atom

• a compound

A student stirs together salt crystals and sugar crystals. The crystals are the same size and color. Together the salt and sugar make a

• solution

• mixture

• compound

• molecule

Which of these is an element and not a compound?

• CO2

• CaO

• CaCl3

• Cl

Which of these is made of atoms?

• oxygen gas

• an x-ray

• a radio wave

• sunlight

Air. water, trees, and all things are composed of tiny particles called

• atoms

• molecules

• crystals

• matter

The equation represents hydrogen and oxygen combining to form water. Which statement best explains how this reaction is similar to all chemical reactions?

2H2 + o2 ---> 2H2O + energy

• matter is created

• energy is released

• the product is in a different state than the reactants

• the product has different properties from the reactants