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Svetlanka [38]
2 years ago
6

A food item that is left out of the refrigerator turns brown and forms bubbles and gas. What are the signs that this is a chemic

al reaction? Check all that apply.
A: Heat is produced.

B: Heat is absorbed.

C: Bubbles appear.

D: A precipitate forms.

E: The color changes.
Physics
2 answers:
Pavel [41]2 years ago
6 0

The answers would be:

C. Bubbles appear

E. The color changes

<u>If you'd like to know more, you can read on:</u>

Although your selections are indications of chemical reactions, if you are referring to only the chemical reaction that occurred in your example, then the two answers are the only choices.

A chemical reaction occurs when the reactants form a new product. Signs of a chemical reaction include change is smell, color and temperature. In some cases, precipitate forms.

jolli1 [7]2 years ago
5 0

Answer: C: Bubbles appear E: The color changes.

Explanation:

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Oxidation of iron to ferric oxide is a chemical change.

4Fe(s)+3O_2(g)\rightarrow Fe_2O_3(s)

Here iron which is grey in color changes first to green and then turns brownish red.

Characteristics of a chemical reaction:

1. change in color

2. heat is gained or lost

3. evolution of gas

4. formation of precipitate

Thus when a food item that is left out of the refrigerator changes colour  and evolution of gas takes place and thus would be a chemical change.

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Answer: Both Technician A and B

Explanation:

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2 years ago
What is the momentum of a 533 kg blimp moving east at +75 m/s
mylen [45]

Answer:

39975kgm/s due east

Explanation:

Given parameters:

Mass of the blimp  = 533kg

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Unknown:

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The momentum of a body is the amount of motion it posses.

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  Momentum = mass x velocity

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I don’t know what the angle is in your diagram so I used the angle from the vertical.

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2 years ago
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Answer:

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But we have a force applied and a displacement of the ball, so yes, the bat does work on the ball.

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