PFE

If Ethylene (C₂H₄) reacts with Oxygen gas in a chemical reaction, what are the products?

• C₂O₂ + H₄

• CO₂ + H₂ + O₂

• CO + H₂

• CO₂ + H₂O

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

The following is what type of reaction:
NH₃ + HCl  → NH₄Cl

• Synthesis
• Decomposition
• Single Replacement Replacement
• Double Replacement Replacement

What type of chemical reaction is this?
Al(OH)₃ → Al₂O₃  + H₂O

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

One element replaces another in a compound.

• Synthesis
• Combustion
• Single Replacement
• Double Replacement

C₄H₁₂ + O₂ → CO₂ + H₂O

• Synthesis
• Combustion
• Single Replacement
• Double Replacement

Which of the following is the general formula for a decomposition reaction?

• A + B  → AB
• AB → A + B
• AB + C → AC + B
• AB + CD → AC + BD

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement

2 NH₃+ 1 H₂SO₄ ----> 1 (NH₄)₂SO₄

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement