Chemical Bonds and Chemical Formulas and Endothermic Exothermic Reactions

Multiple Choice

Atoms form compounds to become more ---

• reactive

• stable

• explosive

• toxic

Multiple Choice

A _______ is the force that holds atoms together in a compound.

• Chemical Formula

• Chemical Reaction

• Chemical Bond

• Synthesis Reaction

Multiple Choice

An electron has a ___ charge.

• no charge

• positive

• negative

• it depends

Multiple Choice

A proton has a ___ charge.

• positive

• negative

• no charge

• it depends

Multiple Choice

According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

• 2

• 4

• 8

• 10

Multiple Choice

Covalent bonds form between ---

• nonmetals.

• metals and metals

• metals and nonmetals

Multiple Choice

Ionic bonds form between ---

• nonmetals.

• metals and nonmetals.

Multiple Choice

Atoms that gain an electron have an electric charge of ---

• -1.

• -2.

• +1.

• +2.

Multiple Choice

If an atom has 7 protons and 7 electrons, its electric charge is ---

• -7

• -14

• 0

• +7

Multiple Choice

An atom with a different number of electrons than it should have (more or less) is called an ---

• isotope

• valence electron

• ion

• octet

Multiple Choice

Which elements are in the formula shown above?

• Antimony only

• Carbon and Sulfur

• Cesium only

• Carbon and Silicon

Multiple Choice

Which elements are in the formula shown above?

• Cobalt only

• Carbon and Oxygen

• Copper only

• Carbon and Osmium

Multiple Choice

How many atoms of sulfur are in each molecule of H₂SO₄?

• 1

• 4

• 2

• 7

Multiple Choice

Alanine is an amino acid with formula C₃H₇NO_2. How many atoms in all are in each molecule of alanine?

• 3

• 7

• 12

• 13

Multiple Choice

How many atoms of carbon are in a molecule of vinyl chloride (C₂H₃Cl)?

• 1

• 3

• 6

• 2

Multiple Choice

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

Multiple Choice

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 31

• 16

• 47

Multiple Choice

In an exothermic reaction, heat is ...

• taken in
• given out

Multiple Choice

In an endothermic reaction, heat is ...

• taken in

• given out

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

Multiple Choice

Baking bread and cooking an egg are examples of....?

• Endothermic processes
• Exothermic processess
• None of these 

Multiple Choice

What type of reaction is shown in the photo?

• Exothermic
• Isothermic
• Endothermic
• None of the  above