Ch 2 - The Chemistry of Life

Subatomic particle with no charge

• proton

• neutron

• electron

• atom

A covalent bond is formed as the result of

• transferring electrons.

• transferring protons.

• sharing protons.

• sharing electrons.

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Smallest unit of matter:

• element

• compound

• atom

• proton

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Which of the following makes up a molecule of water?

• one atom of sodium and one atom of chlorine

• two atoms of hydrogen and one atom of oxygen

• one atom of hydrogen and one atom of oxygen

• one atom of hydrogen and two atoms of oxygen

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The type of bond formed when electrons are transferred from one atom to another

• physical

• covalent

• ionic

• atomic

A substance with a pH of 4 is called

• an acid.

• water.

• a base.

• a suspension.

An atom that gains an electron has a _________ charge.

• negative
• neutral
• ionic
• positive

What best describes the relationship between starch and glucose?

• Starch is a polymer made of glucose monomers.

• Starch and glucose are reactants that combine to form proteins.

• Starch is a monomer that is used to make glucose.

• Starch and glucose are reactants that combine to form nucleic acids.

Several different amino acids join together to form a protein. How do any two types of amino acids differ from one another?

• the number of amino groups in the molecule

• the number of carboxyl groups in the molecule

• the chemical structure of the R group in the molecule

• the number of chemical bonds formed by the central carbon atom

What is the effect of an enzyme on the energy of a chemical reaction?

• Enzymes increase the free energy of the products.

• Enzymes decrease the activation energy of the reaction.

• Enzymes decrease the free energy of the reactants.

• Enzymes decrease the difference in energy between products and reactants.

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