A state of matter that has a definite volume and shape.

• solid

• liquid

• gas

• matter

Solid carbon dioxide, commonly known as dry ice, changes from solid to vapor at room temperature. Predict the change in the motion of the carbon dioxide molecules while it changes state at room temperature.

• The molecules lose their energy and slide past each other.

• The energy of the molecules increases, but the spaces between them decrease.

• The molecules start vibrating in their positions with higher energy.

• The energy of the molecules and the spaces between them increase.

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

When forming an ionic bond, a metal atom

• Gains electrons to form a cation
• Loses electrons to form a cation
• Gains electrons to form an anion
• Loses electrons to form an anion

What elements generally make a covalent bond?

• metal and nonmetal
• 2 or more nonmetals
• metal
• none of the above

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.

An ionic bond forms when 

• Valence electrons are shared
• a sea of mobile electrons surround the cations
• valence electrons are transferred between atoms
• none of the above

How many elements make up this compound?

• 6
• 4
• 2
• 3

Which subatomic particle has a positive charge?

• proton

• neutron

• electron

• midichlorian

Which subatomic particle has a negative charge?

• proton

• neutron

• electron

• cybertron