Unit 2 Vocabulary

What does a chemical equation represent?

• The arrangement of electrons in an atom

• A chemical reaction using symbols, numbers, and an arrow

• The physical properties of a substance

• The melting point of a compound

Which law states that matter is not created or destroyed in a chemical reaction?

• Law of gravity

• Law of conservation of mass

• Law of motion

• Law of energy

What is the smallest unit of an element that retains its properties?

• Molecule

• Atom

• Compound

• Coefficient

Which of the following is a chemical change?

• Melting ice

• Dissolving sugar in water

• Burning wood

• Breaking glass

What does a subscript in a chemical formula indicate?

• The number of molecules

• The number of atoms of an element in a molecule

• The mass of the element

• The temperature of the reaction

Which of the following is an example of a compound?

• Fe

• Na

What is the purpose of a coefficient in a chemical equation?

• To show the number of atoms in a molecule

• To balance the equation

• To indicate the type of reaction

• To show the temperature

Which of the following is NOT a chemical reaction?

• Photosynthesis

• Rusting of iron

• Boiling water

• Burning paper

Which term describes a substance made of two or more different elements chemically combined?

• Element

• Molecule

• Compound

• Atom

• Equals

• Yields or produces

• Multiplies

• Divides