QUIZIZZ

1. Which of the following is NOT a pure substance?

• a) Water

• b) Gold

• c) Air

• d) Sugar

2. What is the smallest unit of an element that retains the chemical properties of that element?

• a) Atom

• b) Molecule

• c) Compound

• d) Ion

3. What type of bond is formed when two atoms share electrons?

• a) Ionic bond

• b) Covalent bond

• c) Metallic bond

• d) Hydrogen bond

4. Which of the following is a chemical change?

• a) Ice melting

• b) Water boiling

• c) Iron rusting

• d) Sugar dissolving in water

5. What is the pH of a neutral solution?

• a) 0

• b) 1

• c) 7

• d) 14

6. What is the chemical formula for water?

• a) H2O

• b) CO2

• c) NaCl

• d) O2

7. Which of the following is a strong acid?

• a) Vinegar

• b) Lemon juice

• c) Hydrochloric acid

• d) Baking soda

8. What is the name of the process by which a solid changes directly into a gas?

• a) Melting

• b) Sublimation

• c) Evaporation

• d) Condensation

9. What is the name of the positively charged particle in an atom?

• a) Electron

• b) Neutron

• c) Proton

• d) Ion

10. What is the name of the process by which a substance absorbs heat energy?

• a) Exothermic reaction

• b) Endothermic reaction

• c) Combustion

• d) Decomposition