Exploring the World of Chemistry

What is the chemical symbol for water?

• H2O2

• O2H

• H2O3

• H2O

What is the pH scale used to measure?

• The color of a solution.

• The density of a solution.

• The acidity or alkalinity of a solution.

• The temperature of a solution.

What are the three states of matter?

• solid, liquid, plasma

• gas, liquid, crystal

• solid, liquid, gas

• plasma, vapor, foam

What is the process of a solid turning into a liquid called?

• Sublimation

• Freezing

• Condensation

• Melting

What is the smallest unit of an element?

• Molecule

• Element

• Compound

• Atom

What do you call a substance made of two or more elements?

• Element

• Solution

• Mixture

• Compound

What is the term for a chemical reaction that absorbs heat?

• Catalytic reaction

• Synthesis reaction

• Endothermic reaction

• Exothermic reaction

What is the periodic table used for?

• The periodic table is used to organize and classify chemical elements.

• To predict weather patterns

• To measure temperature

• To classify animals

What is the main gas that plants use for photosynthesis?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon dioxide

What is an atom's nucleus made up of?

• Photons and neutrinos

• Protons and neutrons

• Electrons and positrons

• Quarks and leptons