Environmental Science Quiz

What are atoms primarily composed of?

• Electrons and protons

• Protons and neutrons

• Only protons

• Neutrons and electrons

Which of the following is a characteristic of elements?

• Can be broken down into simpler substances

• Cannot be broken down into simpler substances

• Are always solids

• Are always gases

What type of bond involves the sharing of electrons?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

What is an example of a covalent bond?

• Water (H₂O)

• Calcium carbonate

• Iron oxide

• Sodium chloride

What is a mixture?

• A single element

• A pure substance

• A combination of elements or compounds not chemically bonded

• A combination of elements chemically bonded

Which of the following is an example of a solution?

• Sand and salt

• Saltwater

• Oil and water

• Sugar and sand

What is the primary function of proteins?

• Act as enzymes

• Provide energy

• Store genetic information

• Form cell membranes

Which macromolecule is responsible for directing protein production?

• Carbohydrates

• Proteins

• Lipids

• Nucleic acids

What property of water allows it to dissolve many substances?

• High density

• Hydrogen bonding

• High boiling point

• Low viscosity

What does the pH scale measure?

• Temperature

• Density

• Acidity or basicity

• Solubility