S.3.3 - Describe Chemical Reactions

Question 1

An electron in an outer orbital that can form bonds with other atoms

Answer 1

Valence Electron

The electrons of the outermost shell of an atom are called valence elect

Question 2

In a chemical equation, the substances on the left side of the equation; the starting materials in a chemical reaction

Answer 2

Reactants

Question 3

In a chemical equation, the substances on the right side of the equation; the substances that are formed in a chemical reaction

Answer 3

products

Question 4

What’s happening in the left of this picture? In the Right?

Answer 4

The Left is Ionic Bonding, the Right is covalent

Covalent and Ionic Bonds
Chemical bonds occur when two or more atoms hav

Question 5

Mathematical representation of a chemical reaction

Answer 5

chemical equation

Question 6

A unit of a substance that is equal to exactly 6.02214076 × 10 particles of that substance

Answer 6

mole

Question 7

Which of these elements have the same number of valence electrons and similar chemical properties as strontium (Sr)? Use the periodic table to help you answer the question.​​​​​​​

Answer 7

Magnesium (Mg)

Elements in the same group have similar properties and the same number of valence electrons.

Question 8

Which of the following sets of coefficients balances the following chemical reaction? ______ N2 + ______ H2 → ______ NH3​​​​​​​

Answer 8

1, 3, 2

It works out to a total of (nitrogens) and (hydrogens) on each side of the reaction.

Question 9

How many oxygen atoms are present on each side of the following reaction? 2C2H18+25O2 → 16CO2+18H2O​​​​​​​

Answer 9

50

There are 50 on the left (25 × 2) and 50 on the right (16 × 2 + 18).

Question 10

In the reaction 2AgCl → 2Ag + Cl2, assuming you started with 4 moles of AgCl, how many moles of Ag could be produced?

Answer 10

4 moles. From the balanced reaction, the ratio of moles of AgCl to moles of Ag is equal.