Day 2 of Chemical Reactions

Day 2 of Chemical Reactions

Multiple Choice

What is a chemical reaction?

• Combination of one or more substances to create one or more different substances

• Physical change of state in which identity of the substances remains the same

• Law stating that the mass of products equals the mass of reactants

• Open system in which some matter escapes

Multiple Choice

What is "Conservation of Mass"?

• Combination of one or more substances to create one or more different substances

• Physical change of state in which identity of the substances remains the same

• Law stating that the mass of products equals the mass of reactants

• Open system in which some matter escapes

Multiple Choice

Which of the following is an example of a chemical reaction?

• Ice melting into liquid water

• Vinegar and baking soda combining to produce a gas

• A nail being pounded into a piece of wood

• A piece of paper being torn up

Multiple Choice

What is an indicator of a chemical reaction?

• Change of state

• Color change

• Change in shape

• Sugary taste

Multiple Choice

In a perfect closed system, what would be the mass of the product when the reactants are combined?

• The mass of the product would be the same as the mass of the reactant

• The mass of the product would be more than the mass of the reactant

• The mass of the product would be less than the mass of the reactant

• The mass of the product would equal zero.

Multiple Choice

What is a reactant?

• Combination of one or more substances to create one or more different substances

• Physical change of state in which identity of the substances remains the same

• Starting materials in a chemical reaction

• Open system in which some matter escapes

Multiple Choice

What is a product?

• Combination of one or more substances to create one or more different substances

• Change in which the identity of the substances remains the same

• Starting materials in a chemical reaction

• Substances produced in a chemical reaction

Multiple Choice

In the chemical equation pictured, which of the following is the product?

• O₂ + CO₂

• C₅H₁₁NH₂ + O₂

• CO₂ + H₂O + NO₂

• C₅H₁₁NH₂ + NO₂

Multiple Choice

In the chemical equation pictured, which of the following is the reactant?

• O₂ + CO₂

• C₅H₁₁NH₂ + O₂

• CO₂ + H₂O + NO₂

• C₅H₁₁NH₂ + NO₂

Multiple Choice

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number in front of a chemical formula.
• The number in between the chemical symbols.
• The number behind a chemical formula.

Multiple Choice

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

Multiple Choice

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes
• No

Multiple Choice

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• yes

• no