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Allushta [10]
4 years ago
15

A substance undergoes a change. Which statement indicates that the change was a chemical change?

Chemistry
1 answer:
romanna [79]4 years ago
5 0

Answer:

Chemical change is represented by change in smell, temp., presence of gaseousness/bubbles, and change in color

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Correct?
bezimeni [28]
Your answer is correct.

2NaCl(s) ---T--> 2Na(s) + Cl2(g)

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8 0
4 years ago
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What is 21.97 to three significant figures
antiseptic1488 [7]

21.97

Sig Figs

   4

Decimals

   2

Scientific Notation

   2.197 × 101

Answer:

Explanation:

7 0
3 years ago
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Which of the following describes a solution of 1 gram of salt dissolved in 500 mL of water?
Law Incorporation [45]

Answer:

B

Explanation

Salt water is a solution where the salt completely dissolves therefore is is homogeneous. Solvent is the liquid (water) that dissolves the solute (salt).

3 0
3 years ago
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How many atoms is 45 moles of silicon (Si)?
TEA [102]
I think it’s 270.9. Hope this help
8 0
3 years ago
How far does light travel in 4 days
anyanavicka [17]
Light travels at precisely <span>299,792,458 metres every second (abbreviated to 3 x 10^8 metres every second but let's be precise)
There are 60 seconds in every minute (</span><span>299 792 458 x 60 = 17,987,547,480m)
60 minutes in every hour (17,987,547,480 x 60 = 1,079,252,849,000m)
96 hours in 4 days (</span><span>1,079,252,849,000 x 96 =  10,360,827,350,000m)
</span><span>Now let's convert to km to make this number (slightly) more manageable
(</span>10,360,827,350,000 / 1000 = <span>103,608,273,500km)
</span>Light travels <span>103,608,273,500km in 4 days - that's the equivalent of going around the equator of the earth 813,124 times!</span><span>

</span>
5 0
4 years ago
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