Unit 4-Chemistry of Biology Test Review

Which of the following best defines matter?

• Anything that is solid or a liquid

• Living things found in the universe

• Anything that occupies space and has mass

• Nonliving things found on Earth and in space

What is the name of the particle that circles the nucleus of an atom?

• Electron

• Proton

• Neutron

• Protein

Which best describes the nucleus of an atom?

• It is negatively charged part of the atom

• It contains no mass

• It is made of neutrons and electrons

• It is the most massive part of the atom

Look at the diagram. It shows the common elements found in the human body. The element X is the most abundant element in the body. What is element X?

• Oxygen

• Barium

• Phosphorus

• Nitrogen

Which element is present in all the large macromolecules in the human body?

• Uranium

• Helium

• Carbon

• Barium

Which two atoms form a covalent bond?

• Two oxygen atoms

• Two sodium atoms

• An iron atom and an oxygen atom

• A sodium atom and a chlorine atom

What happens when a sodium atoms loses an electron in its outer energy shell?

• It becomes a positive ion

• It becomes a negative ion

• It has an increase in the number of protons

• It has an increase in the number of neutrons

A lithium atom that has lost an electron comes near a chlorine atoms that has gained an electron. What happens?

• They form an ionic compound

• They form a covalent compound

• They form a hydrogen bond

• They form a peptide bond

Which molecule most likely has the greatest amount of stored energy in its bonds?

• Na-Cl

• H-O-H

• O=C=O

• Fe-O

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

• Frying an egg

• Dissolving salt

• Freezing water

• Bending metal