Chapter 7 Test: Chemical Equations
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You are going to take a quiz on chemical equations. Answer the following questions by selecting the correct choice.
- 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.
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
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