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yan [13]
3 years ago
13

Rita wants to make some toast for breakfast. She puts a slice of bread in the toaster. After 3 min, Rita notices that the sides

of the bread are black. What has happened?
A. The bread has undergone a change of state.

B. The bread has undergone a change in density.

C. Some of the matter in the bread was destroyed.

D. New substances have formed as the result of a chemical change.
Chemistry
2 answers:
fredd [130]3 years ago
6 0
The answer is D


Because the bread cannot go back to its previous state, and because a new substance was formed. :)
goldfiish [28.3K]3 years ago
5 0
I believe the answer is c.

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As electricity flows through a copper wire, the temperature of the wire increases. Some parts of the wire get warmer than others
mezya [45]

Answer:

Conduction

Explanation:

The heat can be transferred in the substances in three ways: conduction, convection, and radiation.

The conduction happens inside the material, usually a solid, and the heat flows as the molecules of the substance are agitated. The convection happens when there are different substances in touch, so it is the heat passage from a solid to a liquid or gas, from a gas to a liquid or vice versa. The radiation occurs between substances that are far away and the heat flows by electromagnetic waves.

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On the fahrenheit scale, at what temperature does water boil? a. 451°f b. 264°f c. 212°f d. 100°f
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5 0
2 years ago
Express the concentration of a 0.0610 m aqueous solution of fluoride, f–, in mass percentage and in parts per million. assume th
ASHA 777 [7]
<span>Assume you have 1 L of solution.
Moles F- = M F- x L F- = (0.0610)(1) = 0.0610 moles F-
0.0610 moles F- x(19.0 g F-/1mole F-) = 1.159 g F- in 1 L of solution
1 L solution x (1000 mL / 1 L) x (1.00 g / mL) = 1000 g of solution
mass % F- = (g F- / g solution) x 100 = (1.159 / 1000) x 100
= 0.1159%
parts per million F- = mg F- /L = 1159 / 1 = 1159 ppm F-</span>
8 0
3 years ago
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