Unit 5: Chemical Reactions

What is the product of a combustion reaction involving hydrocarbon compounds?

• sulfur dioxide and nitrogen dioxide

• dicarbon hexahydride

  and water

• oxygen and nitrogen

• carbon dioxide and water

What is the difference between a synthesis reaction and a decomposition reaction?

• Synthesis reaction combines substances, while decomposition reaction breaks them down.

• Synthesis is a type of chemical reaction while decomposition is not.

• Synthesis reaction only involves one compound/element, while decomposition reaction involves multiple compound/element.

• Synthesis reaction breaks compound/element down, while decomposition reaction combines them.

What happens to the mass of the reactants and products in a chemical reaction, according to the law of conservation of mass?

• The total mass decreases

• The total mass increases

• The total mass remains constant

• The total mass becomes zero

Tags

NGSS.HS-PS1-7

What type of reaction is

4Fe+3O₂​→2Fe_2​O₃​

• Synthesis

• Single replacement

• Double replacement

• Combustion

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

Identify the reaction: 2Al + Fe₂O₃ -----> Al₂O₃ + 2Fe

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Balance the following equation:

__ KOH + __ HBr → __ KBr + __ H₂O

• 8, 8, 2, 2

• 1, 1, 1, 1

• 4, 2, 2, 4

• 2, 2, 2, 2

Tags

NGSS.HS-PS1-7

Balance the equation.

__ N₂ + __ H₂ → __ NH₃

_{The number are shown in order from left to right for the blanks.}

• 2, 3, 1

• 2, 1, 3

• 3, 1, 2

• 1, 3, 2

Tags

NGSS.HS-PS1-7

Na₂O + P₄O₁₀ -------> Na₃PO₄

Write in words

• sodium oxide and phosphorus oxide yield sodium phosphate

• sodium oxide and tetraphosphorus decaoxide yield sodium phosphate

• disodium oxide and phosphorus decaoxide yield sodium phosphate

• sodium(I) oxide and tetraphosphorus decaoxide yield sodium(I) phosphate

The number of atoms of  N (nitrogen) in 3N₂O₅ is

• 2
• 5
• 6
• 15

Tags

NGSS.MS-PS1-1