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Question and answer
What happens to a catalyst in a reaction? A. It is unchanged. B. It is incorporated into the products. C. It is incorporated into the reactants. D. It evaporates away.
The answer is A. It is unchanged.
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User: What happens to a catalyst in a reaction? A. It is unchanged. B. It is incorporated into the products. C. It is incorporated into the reactants. D. It evaporates away.

Weegy: The answer is A. It is unchanged.
sharpies|Points 8827|

User: Which of the following statements about reaction rates is not true? A. One way to increase the reaction rate is to increase the temperature of the system. B. One way to slow down the reaction rate is to decrease the temperature of the system. C. One way to increase the reaction rate is to decrease the concentration of reactants. D. One way to increase the reaction rate is to decrease particle size.

Weegy: A. Increasing the temperature will increase reaction rate
AwesomeGuy200|Points 1177|

User: Active sites are specific to one type of _____. A. enzyme B. product C. substrate D. reactant

Weegy: Active sites are specific to one type of: C. SUBSTRATE.



User: Which of the following factors affects a reaction rate the most? A. activation energy B. whether one or two reactant molecules is required C. relative energy in reactant and product molecules D. relative masses of reactant and product molecules

Weegy: A. activation energy
Controler|Points 3928|

User: If a catalyst is used in a reaction, A. the energy of activation increases. B. different reaction products are obtained. C. the reaction rate increases. D. the reaction rate does not change

Weegy: It is letter C. the reaction rate increases. A catalyst is a substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process. [ In an equilibrium reaction it speeds up the rate of forward and backward reactions. But a catalyst will not affect the final equilibrium of the reaction. ]
Expert answered|carl1980|Points 112|

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Asked 5/3/2013 1:19:37 AM
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For many years inventors tried to develop a perpetual motion machine, one that would continue moving forever once it was set in motion. They were never successful because A. all machines are closed systems. B. they could never make a perfectly silent machine. C. friction between moving parts would transform the kinetic energy to heat. D. kinetic energy would be transformed to potential energy in such a machine.
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Which temperature scale would read the lowest number for a mixture of water and ice? A. Kelvin B. Celsius C. Fahrenheit
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Updated 1/31/2016 8:34:21 AM
2 Answers/Comments
A thermometer is placed into a flask of water with pieces of ice and reads 273.15. The KELVIN temperature scale is being used.
Added 1/31/2016 8:32:00 AM
This answer has been confirmed as correct, not copied, and helpful.
Because their particles move and bounce around more freely, gases typically have more kinetic energy than liquids and solids.
Added 1/31/2016 8:34:21 AM
This answer has been confirmed as correct, not copied, and helpful.
The smallest amount of energy molecules need to stick together and react is called _____. A. kinetic energy B. reaction energy C. potential energy D. activation energy
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If a catalyst is used in a reaction, A. the energy of activation increases. B. different reaction products are obtained. C. the reaction rate increases. D. the reaction rate does not change.
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Updated 1/31/2016 8:39:59 AM
2 Answers/Comments
If a catalyst is used in a reaction, the reaction rate increases.
Added 1/31/2016 8:36:24 AM
This answer has been confirmed as correct, not copied, and helpful.
"All of these". If a substance could reach absolute zero, heat, temperature, and particle motion would ALL be equal to zero.
Added 1/31/2016 8:39:59 AM
This answer has been confirmed as correct, not copied, and helpful.
If two separate volumes of an ideal gas, 3 mL and 6 mL, could be cooled to absolute zero, which theoretical volume of gas would be the largest? A. 3 mL B. 6 mL C. Neither; both volumes of gas would be equal to zero. D. Neither; both volumes of gas would be larger but by the same amount.
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