The Chemistry of Life

The three particles that make up atoms are

• protons, neutrons, and isotopes

• neutrons, isotopes, and electrons

• protons, neutrons, and electrons

What are found in the space surrounding the nucleus of an atom?

• protons

• electrons

• neutrons

Isotopes are atoms of the same element with the same number of protons and a different number of

• electrons

• neutrons

• ions

Which of the following is a substance formed by the chemical joining of two or more elements in definite amounts?

• compound

• isotope

• nucleus

What type of ion forms when an atom loses electrons?

• neutral

• positive

• negative

In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is

• slightly negative

• slightly positive

• very positive

When sugar is dissolved in water, water is the

• reactant

• solute

• solvent

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is

• 4

• 7

• 11

A covalent bond is formed as the result of

• transferring electrons

• sharing electrons

• sharing protons

A substance with a pH of 6 is called

• an acid

• a base

• a suspension