Chemistry, 16.10.2020 05:01, Dericktopsom
In an experiment, calcium carbonate reacted with different volumes of hydrochloric acid in water. One of the products formed during the experiment was carbon dioxide. The time taken for 0.89 mL of carbon dioxide to form was recorded. A partial record of the experiment is shown.
Experimental Record
Flask Mass of
Calcium Carbonate Volume of
HCl Volume of
Water Time
1 4.0 g 25 mL 0 mL 11.2 seconds
2 4.0 g 20 mL 5 mL
3 4.0 g 15 mL 10 mL
4 4.0 g 10 mL 15 mL
Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs.
Answers: 3
Chemistry, 21.06.2019 18:30, jadepotts3965
Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)
Answers: 2
Chemistry, 22.06.2019 12:00, Unknowndragon42
Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon
Answers: 2
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