C1.1/2 - Chemical Equations

Question 1

Symbol equation

Answer 1

• helps you see how much of each substance is involved in the reaction
• includes formulas that cannot be changed (H2O)

Question 2

Any chemical reaction has …

Answer 2

• a new substance created

- a rearrangement of atoms

Question 3

Law of conservation

Answer 3

• no mass is created or destroyed

- Total mass of reactants = total mass of products

Question 4

State symbols

Answer 4

• tell us what state each element is at room temperature
• s = Solid
• l = liquid
• g = gas
• Aq = aqueous solutions (dissolved in water)

Question 5

Balancing equations

Answer 5

• same amount of atoms on either side
• must be balanced to prove law of conservation
• when balancing the number goes in front of compound, changing all elements in the compound
• can’t change formulas