1. which of these is an indication that a chemical reaction has occurred? a. formation of a precipitate b. melting of a substance c. boiling of a substance d. freezing of a substance 2. if decreases in temperature accompanies a reaction, what occurred? a. energy was destroyed b. energy was created c. energy was absorbed d. energy was released 3. which of these accurately describes the products of a reaction? a. new substances that are present at the end of a reaction b. substances that were not used up in a reaction c. substances that are used in a reaction d. substances that do not participate in a reaction 4. which of these describes an exothermic reaction? a. energy is released by the reaction b. energy is created in the reaction c. energy is absorbed by the reaction d. no energy is transferred by the reaction 5. what occurs in a chemical reaction a. reactants are formed without chemical bonds being broken b. reactants are formed from products by the breaking and forming of bonds c. products are formed without chemical bonds being broken d. products are formed reactants by the breaking and forming of new bonds.
Answers: 1
Other questions on the subject: Chemistry
Chemistry, 22.06.2019 13:00, nadikadiaz1
These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.
Answers: 1
Chemistry, 22.06.2019 14:00, BrandyLeach01
How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?
Answers: 3
Chemistry, 22.06.2019 17:30, llamasking
Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)
Answers: 2
You know the right answer?
1. which of these is an indication that a chemical reaction has occurred? a. formation of a precipi...
Questions in other subjects:
History, 09.06.2020 05:57
English, 09.06.2020 05:57
Social Studies, 09.06.2020 05:57
