Chemical Bonds and Reactions review

What is a chemical bond?

• A mixture of two or more different substances

• A type of compound

• An attraction between atoms that forms a chemical combination of atoms

• An attraction between atoms that forms a physical mixture of atoms

Which electrons are most important to forming chemical bonds?

• The electrons in the innermost shell

• The electrons in the outermost shell

• Electrons in both the inner and outer shell

• Electrons are not important to forming chemical bonds.

What is the difference between an ionic and covalent bond?

• Atoms share electrons in an ionic bond and transfer electrons in a covalent bond

• Atoms transfer electrons in an ionic bond and share electrons in a covalent bond

• Atoms share electrons equally in an ionic bond and unequally in a covalent bond

• Atoms share electrons unequally in an ionic bond and equally in a covalent bond

Diatomic molecules are made of:

• Two atoms of the same element bonded together

• Three atoms of the same element bonded together

• Two atoms of different elements bonded together

• Three atoms of different elements bonded together

What happens when you mix a polar and nonpolar substance together in a container?

• The substances chemically combine

• The substances evenly distribute in the container

• The substances separate in the container

• The substance chemically react to form a new substance

What property determines what type of bond two atoms will form?

• The number of neutrons in the nucleus of each atom

• The atoms’ electronegativity

• The atoms’ physical properties

• The ratio of protons to neutrons in the nucleus of each atom

How many nitrogen atoms are in one molecule of (NH4)2SO4?

• 1

• 2

• 4

• 8

What is a chemical reaction?

• The process of physically combining two different substances

• The process that leads to the change of one set of chemical substances into another

• The process of spontaneously creating new substances from nothing

• The process of changing an element into a completely new element

You mix two liquid substances together and bubbles appear. What does this indicate?

• A solid has formed

• A gas has formed

• Condensation has taken place

• Evaporation has taken place

When bonds break, energy can be:

• Transferred to other atoms so to form new bonds

• Transformed into thermal energy and released into the environment

• Transformed into light energy, which you see as a spark

• All of the above