chemical equations

Question 1

law of conservation of mass

Answer 1

The Law of Conservation of Mass is the idea that atoms cannot be created or destroyed.

Question 2

Write the word equation for the reaction of silicon with oxygen to form silicon dioxide.

Answer 2

silicon + oxygen rightwards ——– silicon dioxide

Question 3

What type of equation is this?

2Br- + Cl2 rightwards arrow Br2 + 2Cl-

Answer 3

ionic equation

Question 4

What numbers are missing to balance this equation?

…..H2O2 rightwards arrow …..H2O + ….. O2

Answer 4

The missing numbers to balance the equation are:

2H2O2 rightwards arrow 2H2O + O2

Question 5

What are products?

Answer 5

Products are the new substances which are on the right-hand side of the arrow in a chemical equation, formed by the reaction of reactants.

Question 6

Write the symbol equation for the reaction of magnesium with chlorine to form magnesium chloride.

Answer 6

The symbol equation for the reaction of magnesium with chlorine to form magnesium chloride is:

Mg + Cl2 rightwards arrow MgCl2

Question 7

True or False?

The balanced symbol equation for the reaction of sodium with chlorine is:

Na + Cl2 rightwards arrow NaCl2

Answer 7

False.

The balanced symbol equation for the reaction of sodium with chlorine is:

2Na + Cl2 rightwards arrow 2NaCl

Question 8

name all diatomic molecules and a way to remeber them

Answer 8

Have No Fear Of Ice Cold Beer”
(Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine)

-Here’s the list again:

H₂ – Hydrogen

O₂ – Oxygen

N₂ – Nitrogen

Cl₂ – Chlorine

Br₂ – Bromine

I₂ – Iodine

F₂ – Fluorine

Question 9

What numbers are missing to balance this equation?

…..N2 + …..H2 ⇌ …..NH3

Answer 9

The missing numbers to balance the equation are:

N2 + 3H2 ⇌ 2NH3