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The graph shows how the concentrations of two compounds change during a chemical reaction. During which time period does the product change most rapidly?  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078768365/161383/649_213_q1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (16.0K)</a>]]>
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| | A) | 0 min to 1 min |
| | B) | 2 min to 3 min |
| | C) | 1 min to 2 min |
| | D) | 3 min to 4 min |
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| 2.
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Look at the following equation:
2AgNO3 + Cu →Cu(NO3)2 + 2Ag
Which term describes the copper on the left side of the equation? |
| | A) | reactant |
| | B) | catalyst |
| | C) | enzyme |
| | D) | product |
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| 3.
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Which particles must have an equal number on both sides of a chemical equation? |
| | A) | electrons |
| | B) | molecules |
| | C) | subscripts |
| | D) | atoms |
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| 4.
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The illustration shows the breakdown of water when energy is added to it. What is the chemical equation for the reaction?  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078768365/161383/649_60_q4_q5.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (16.0K)</a>]]>
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| | A) | H2O + energy → 2H + O |
| | B) | 2H2O + energy → 2H2O + O2 |
| | C) | H2O + energy → H2O + O2 |
| | D) | 2H2O + energy → 2H2 + 2O |
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Which of the following terms best describes the reaction? <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078768365/161383/649_60_q4_q5.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (16.0K)</a>]]> |
| | A) | acidic |
| | B) | catalytic |
| | C) | exothermic |
| | D) | endothermic |
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| 6.
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What is the purpose of a catalyst in a reaction? |
| | A) | increase the concentration in a reaction |
| | B) | increase the speed of a chemical reaction |
| | C) | decrease the concentration in a reaction |
| | D) | decrease the speed of a chemical reaction |
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| 7.
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Which of the following chemical equations is balanced? |
| | A) | 2CF2Cl2 → 2CF2Cl + 2Cl2 |
| | B) | C3H8 + 5O2 → 3CO2 + 4H2O |
| | C) | NaCl + H2SO4 → Na2SO4 + HCl |
| | D) | Zn + CrCl3 → CrCl2 + ZnCl2 |
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| 8.
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Look at the chemical equation below:
3Na + AlCl3 → 3NaCl + Al
If you start with 15 molecules of sodium, how many aluminum molecules will be produced? |
| | A) | 3 |
| | B) | 5 |
| | C) | 10 |
| | D) | 15 |
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| 9.
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What effect does an increased concentration of reactant often have on chemical reactions? |
| | A) | increased rate |
| | B) | decreased rate |
| | C) | decreased temperature |
| | D) | increased temperature |
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| 10.
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Which of the following is used to speed up reactions in the body's cells? |
| | A) | coefficient |
| | B) | inhibitor |
| | C) | precipitate |
| | D) | enzyme |
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