Synthesis and Decomp reactions

Which of the following equations represents the balanced synthesis reaction of iron (III) and oxygen?

• Fe + 3 O₂ → Fe₂O₃
• 3 Fe + 3 O₂ → 2 Fe₂O₃
• 2 Fe + O₂ → Fe₂O₃
• 4 Fe + 3 O₂ → 2 Fe₂O₃

If an element is diatomic it should have a subscript of___

• 2, always
• 2, only when it is by itself
• it shouldn't have a subscript, it should have a coefficent

What kind of reaction is this:
4Fe  +  3O₂ →   2Fe₂O₃ 

• Synthesis
• Decomposition
• Single Replacement 
• Double Replacement

What kind of reaction is this:
2H₂O₂ →2 H₂O + O₂

• Synthesis
• Decomposition
• Single Replacement 
• Combustion

What is the product when rubidium and oxygen gas react?

• RbO₂
• Rb₂O
• RbO
• Rb₂O₂

 Predict the product(s):  H₂O -->

• H and O
• H₂ and O₂
• H and OH

Which of the following are PRODUCTS?
H₂O + CO₂ → HCO + HO

• H₂O and CO₂
• HCO and HO
• H₂O ONLY
• HCO ONLY

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

Predict the product of the following synthesis reaction.

Ca + N₂ -->

• CaN₂

• CaN

• Ca₃N₂

• CaNNot

Predict the products of the following decomposition reaction, before balancing.

HgO -->

• Hg + O

• Hg₂ + O₂

• Hg + O₂

• Hg₂ + O