Background: When the temperature of reactants is higher, the rate of the reaction is faster. At higher temperatures, particles of reactants have more energy, so they move faster. As a result, they are more likely to bump into one another and to collide with greater force. For example, food spoils because of chemical reactions, and these reactions occur faster at higher temperatures (see the bread on the left in the Figure below ). This is why we store foods in the refrigerator or freezer (like the bread on the right in the Figure below ). The lower temperature slows the rate of spoilage.

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In which test the particles of reactants would have higher energy, test A or test B?
Answer: test A

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In which test the particles of reactants would have lower energy, test A or test B?
Answer: test B

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: Would particles of reactants in test A have lower or higher energy than particles in test B?
Answer: higher

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: Would particles of reactants in test B have lower or higher energy than particles in test A?
Answer: lower

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In which test particles would move faster, test A or test B?
Answer: test A

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In which test particles would move slower, test A or test B?
Answer: test B

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In test A would the particles move faster or slower than in test B?
Answer: faster

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: In test B would the particles move faster or slower than in test A?
Answer: slower

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: Food in which test would spoil at a faster rate, test C or test D?
Answer: test D

Situation: John was pondering about what makes a chemical reaction faster or slower. To find the answer he did two tests, test A and test B. In test A he warmed up the reactants, but in test B he cooled down the reactants. To see a practical example of these tests he conducted two more tests, test C and test D. In test C he kept a food item in the refrigerator, but in test D he kept the same food item on the table top.

Question: Food in which test would spoil at a slower rate, test C or test D?
Answer: test C

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Which reactants would have particle's with higher energy, reactant A or reactant B?
Answer: reactant A

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Which reactants would have particle's with lower energy, reactant A or reactant B?
Answer: reactant B

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: In which reactants the particles would move faster, reactant A or reactant B?
Answer: reactant A

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: In which reactants the particles would move slower, reactant A or reactant B?
Answer: reactant B

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Would particles move faster or slower in reactant A than in reactant B?
Answer: faster

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Would particles move faster or slower in reactant B than in reactant A?
Answer: slower

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: In which reactants the particles would collide with greater force, reactant A or reactant B?
Answer: reactant A

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: In which reactants the particles would collide with smaller force, reactant A or reactant B?
Answer: reactant B

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Would particles would collide with smaller or greater force in reactant A than in reactant B?
Answer: greater

Situation: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would  be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B.

Question: Would particles would collide with smaller or greater force in reactant B than in reactant A?
Answer: smaller