4-10 Unit 4 Review Equations Types and Balancing

Balance the following:

____ Fe + ____ Cl₂ → ____ FeCl₃

• 1,1,2
• 1,3,1
• 2,2,3
• 2,3,2

Which type of reaction is:

C₇H₁₆ + 10 O₂ → 7 CO₂ + 8 H₂O

• Synthesis
• Decomposition
• Single Displacement
• Combustion

Which type of reaction is:

3 Pb + 2 H₃PO₄ → 3 H₂ + Pb₃(PO₄)₂

• Synthesis
• Single Displacement
• Double Displacement
• Combustion

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O₂

• MgO

• Mg and MgO

• O and MgO

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

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

• coefficients, subscripts

• subscripts, coefficients

• formulas, subscripts

• coefficients, formula units

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

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Si + S₈ --> Si₂S₄

• Synthesis (combination)
• Decomposition
• Single replacement
• Double replacement

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!