6-1 couting atoms and chemical equation types

The law of conservation of matter states that

• chemical reactions change matter.
• in chemical reactions, the identity of reactants and products is conserved.
• atoms are neither created nor destroyed in chemical reactions.
• a chemical equation must be balanced.

When balancing a chemical equation, you can only change _________, you can never change _______!

• coefficients, subscripts

• subscripts, coefficients

• formulas, subscripts

• coefficients, formula units

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with
• must be an even number
• can be different to the number you finish with
• changes depending on how much energy is formed

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula

The blue numbers in the image represent

• subscripts

• coeffiecients

• roman numerals

• none of the answer options are correct

The red numbers in the image represent

• subscripts

• coeffiecients

• roman numerals

• none of the answer options are correct

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

The following reaction is an example of what reaction type? 
CoCO₃ → CoO + CO₂

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Which type of reaction is:

C₇H₁₆ + 10 O₂ → 7 CO₂ + 8 H₂O

• Synthesis
• Decomposition
• Single Displacement
• Combustion