Chapter 7 Test: Chemical Equations

6 Questions | By Rhussain | Updated: Mar 21, 2022 | Attempts: 2821

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Chapter 7 Test: Chemical Equations - Quiz

You are going to take a quiz on chemical equations. Answer the following questions by selecting the correct choice.

Questions and Answers

1.

The products and the reactants in the reaction have the same ___.
- A.
  
  Atoms
- B.
  
  Molecules
- C.
  
  Subscripts
- D.
  
  Bond energies
2.

A balanced equation represents the law of mass conservation, and as a result all of the following are true except ___.
- A.
  
  The number of moles of products equals the number of moles of reactants
- B.
  
  The total mass of the product equals the total mass of the reactants
- C.
  
  The number of atoms in the products equals the number of atoms in the reactants
- D.
  
  The states of matter of the products are independent of the states of reactants
3.

A chemical reaction has not occurred if the products have ___.
- A.
  
  The same mass as the reactants
- B.
  
  Less total bond energy than the reactants
- C.
  
  More total bond energy than the reactants
- D.
  
  The same chemical properties as the reactants
4.

The chemical reaction is exothermic if ___.
- A.
  
  ∆H is a negative value
- B.
  
  ∆H is a positive value
- C.
  
  Energy is absorbed during the reaction
- D.
  
  Energy is conserved during reaction
5.

The only single-displacement reaction among the following chemical equations is ___.
- A.
  
  2H2O2(l) → 2H2O(l) + O2(g)
- B.
  
  Pb(s) + Hg2SO4(s) → PbSO4(s) + 2Hg(l)
- C.
  
  2NH3(g) → N2(g) + 3H2(g)
- D.
  
  NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO→3(aq)
6.

C(s) + O2(g) → CO2(g)+ energy is a chemical reaction because ____.
- A.
  
  It releases energy
- B.
  
  The chemical properties of CO2 are different from the individual properties of carbon and oxygen
- C.
  
  It absorbs energy
- D.
  
  CO2 is a gas and carbon is a crystal