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NeX [460]
3 years ago
14

I will give brainliest!! How long is the pencil? Make sure to use the appropriate amount of significant figures.

Chemistry
1 answer:
8090 [49]3 years ago
5 0

Answer: Option (c) is the correct answer.

Explanation:

The bottom of pencil is placed at the starting point of scale. Whereas the tip of pencil depicts the end point of its length.

The bottom of pencil is at 0 mm and tip of pencil is at 18.73 mm. The appropriate amount of significant figures is 18.73 mm.

Therefore, we can conclude that out of the given options, pencil is 18.73 mm long.


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Answer:

0,0,0,0

Explanation:

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So:

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Oxygen: 6 elec. of valence, 2 lone pairs and shares two electrons with the H and two with the F

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Fluorine: 7 elec. of valence, 6 lone pairs and shares two electrons with the O

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Which of the following is most likely an indication of a chemical change?
mamaluj [8]

Hello there!

Question: Which of the following is most likely an indication of a chemical change?

Answer Choices:

A. A loud sound when an MP3 player is turned on.

B. A loud sound when someone claps their hands.

C. A loud sound when a starter's pistol is fired at a race.

D. A loud sound when a large object falls to the ground.

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C. A loud sound when a starter's pistol is fired at a race.

Reasons:

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B would not be correct since clapping hands causes a loud sound due to two forces slamming together and causes a disturbance in the air.

D would not be correct since a large object falling to the ground does not indicate any chemical reactions or changes since its merely the result of a mass hitting another mass.

C would be correct since the gunpowder mixes with other substances inside the pistol's chamber and causes and explosion, and explosions are part of a chemical reaction indicators.

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