Biology Chapter 2 - Chemistry

What three particles make up an atom? (CHOOSE 3)

• Protons

• Isotopes

• Neutrons

• Electrons

• Cells

What is water made of?

• one hydrogen and one oxygen

• one sodium and one chlorine

• one hydrogen and two oxygen

• two hydrogen and one oxygen

What is the most abundant compound in most living things?

• water

• carbon dioxide

• sugar

• sodium chloride

Where are electrons in an atom?

• In the nucleus

• Surrounding the nucleus

A covalent bond is formed by:

• transferring electrons

• sharing an electron pair

• transferring protons

• sharing a proton pair

What particles are in the nucleus of an atom?

• protons

• electrons

• neutrons

• ions

A substance with a pH of 6 is:

• a strong acid

• a weak acid

• a strong base

• a weak base

water + carbon dioxide + sunlight --> oxygen + glucose

• photosynthesis

• respiration

When hydrogen and oxygen combine to form water, water is the:

• product

• reactant

Neutral atoms have same number of:

• protons and electrons

• protons and neutrons

• neutrons and electrons