An unknown substance undergoes a chemical change that gives off heat. Which statement is true? The types of molecules of the substance before and after the chemical change are different, and the change was endothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was exothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was endothermic. The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.
Answers: 1
Another question on Chemistry
Chemistry, 22.06.2019 04:30
How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer
Answers: 1
Chemistry, 22.06.2019 05:40
Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3
Answers: 3
Chemistry, 22.06.2019 08:30
Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol
Answers: 2
Chemistry, 22.06.2019 20:40
What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.
Answers: 1
You know the right answer?
An unknown substance undergoes a chemical change that gives off heat. Which statement is true? The t...
Questions
History, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
History, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
History, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
Mathematics, 19.03.2021 19:50
English, 19.03.2021 19:50
