Understanding Matter and Its Reactions

Which of the following is a physical change?

• Burning wood

• Dissolving salt in water

• Rusting of iron

• Cooking an egg

What is conserved in a chemical reaction?

• Mass

• Volume

• Shape

• Color

Which of the following is a chemical change?

• Melting ice

• Boiling water

• Milk souring

• Breaking glass

What does the atomic number of an element represent?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of protons and electrons in the atom

Which of the following is NOT a property of matter?

• Mass

• Color

• Temperature

• Time

In the periodic table, elements are arranged in order of increasing:

• Atomic mass

• Atomic number

• Number of neutrons

• Electronegativity

What happens to the mass of products in a chemical reaction compared to the mass of reactants?

• It increases

• It decreases

• It stays the same

• It becomes zero

Which of the following is an example of a chemical reaction?

• Ice melting

• Water boiling

• Iron rusting

• Sugar dissolving in water

What is the term for a substance that cannot be broken down into simpler substances by chemical means?

• Compound

• Molecule

• Element

• Mixture

Which of the following changes indicates a chemical reaction has occurred?

• Change in state

• Change in mass

• Release of energy

• Change in volume