Chemistry, 27.08.2020 03:01 XTREME3336
Read the list of sentences from the article.
1. In a physical change, the material involved is structurally the same before and after the change.
2. A piece of metal may be heated in a fire until it glows, but the metal is the same material before heating and after cooling.
3. Chemical changes require the breaking and forming of chemical bonds during a chemical reaction.
4. The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place that has altered the original substances.
Which two sentences, taken together, provide the BEST evidence to support the idea that both physical and chemical changes can significantly change the appearance of a substance?
a. 1 and 3
b. 1 and 4
c. 2 and 3
d. 2 and 4
Answers: 2
Chemistry, 21.06.2019 16:00
Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .
Answers: 2
Chemistry, 22.06.2019 07:20
Which of these conditions most likely produces an unstable isotope?
Answers: 1
Chemistry, 22.06.2019 20:00
What happens to the temperature of a substance when the average kinetic energy of its particles increases?
Answers: 3
Chemistry, 22.06.2019 21:00
Which of the following is a physical property flammability heat of combustion solubility and toxicity
Answers: 1
Read the list of sentences from the article.
1. In a physical change, the material involved is stru...
Spanish, 22.02.2021 20:00
Geography, 22.02.2021 20:00
Mathematics, 22.02.2021 20:00
Biology, 22.02.2021 20:00
Mathematics, 22.02.2021 20:00
Physics, 22.02.2021 20:00
Mathematics, 22.02.2021 20:00
Mathematics, 22.02.2021 20:00
Business, 22.02.2021 20:00