Chemistry Unit Test Study Guide

An atom is a single unit of an element, while a molecule is a group of atoms bonded together.

An atom is a group of molecules bonded together, while a molecule is a single unit of an element.

An atom and a molecule are the same, with no differences.

An atom is larger than a molecule.

Proton - positive charge; determines identity of the atom. Neutron - no charge/neutral; holds the nucleus together. Electron - negative; responsible for reactivity.

Proton - negative charge; responsible for reactivity. Neutron - positive charge; determines identity of the atom. Electron - no charge/neutral; holds the nucleus together.

Proton - no charge/neutral; holds the nucleus together. Neutron - negative charge; responsible for reactivity. Electron - positive charge; determines identity of the atom.

Proton - positive charge; responsible for reactivity. Neutron - negative charge; holds the nucleus together. Electron - no charge/neutral; determines identity of the atom.

Carbon - 6 atoms, Oxygen - 6 atoms, Hydrogen - 12 atoms. Chemical formula: C6H12O6.

Carbon - 5 atoms, Oxygen - 5 atoms, Hydrogen - 10 atoms. Chemical formula: C5H10O5.

Carbon - 6 atoms, Oxygen - 12 atoms, Hydrogen - 6 atoms. Chemical formula: C6H6O12.

Carbon - 12 atoms, Oxygen - 6 atoms, Hydrogen - 6 atoms. Chemical formula: C12H6O6.

Because of the spherical shape of sodium and chloride ions

Due to the extended structure of salt molecules arranging themselves in a repeating pattern

Because of the hexagonal packing of ions

Due to the random arrangement of ions

Physical properties can be observed without changing it into another substance, while chemical properties is the ability to change into a different substance through a chemical reaction.

Physical properties involve changes in the chemical composition of a substance, while chemical properties do not.

Physical properties are always visible, while chemical properties are not.

Physical properties are related to the substance's mass, while chemical properties are related to its volume.

Determined by a substance molecular formula and structure (composition)

The temperature and pressure conditions

The amount of substance present

The color and texture of the substance

They are created.

They are destroyed.

They are both created and destroyed.

They remain unchanged.

Both physical and chemical changes alter the substance's identity.

A physical change alters the substance's identity, while a chemical change alters only the form of a substance.

A physical change alters the form of a substance, not its identity, while a chemical change alters the substance's identity.

Neither physical nor chemical changes alter the form or identity of a substance.

Color change, temperature change, gas production, sound emission, and odor change

Color change, temperature change, bubbles of gas, precipitate formation, and change in taste/smell

Color change, temperature change, gas production, precipitate formation, and sound emission

Color change, temperature change, gas production, odor change, and light emission