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Ivenika [448]
3 years ago
9

Which of the following are signs of a chemical change/reaction? Select all that apply.

Chemistry
1 answer:
Ymorist [56]3 years ago
3 0

Answer:

the answers are

Explanation:

5,6,7,8&9.

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Coal and Diamond are two different form of carbon. which is denser?​
GalinKa [24]

Answer:

diamond is denser because it is more tightly packed than coal

7 0
3 years ago
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Fulgurites are the products of the melting that occurs when lightning strikes the earth. Microscopic examination of a sand fulgu
BlackZzzverrR [31]

Answer:

Fe₃Si₇

Explanation:

In order to determine the empirical formula, we have to follow a series of steps.

Step 1: Determine the percent composition

Fe: 46.01%

Si: 53.99%

Step 2: Divide each percentage by the atomic mass of the element

Fe: 46.01/55.85 = 0.8238

Si: 53.99/28.09 = 1.922

Step 3: Divide all the numbers by the smallest one

Fe: 0.8238/0.8238 = 1

Si: 1.922/0.8238 = 2.33

Step 4: Multiply by numbers that make the coefficients whole.

Fe: 1 × 3 = 3

Si: 2.33 × 3 = 7

The empirical formula is Fe₃Si₇.

5 0
3 years ago
Which is a measurement of distance that is used around the world?
ivolga24 [154]
500 meters is the correct answer :)
8 0
3 years ago
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Aqueous sodium phosphate and aqueous iron (III) chloride react to produce aqueous sodium chloride and solid iron (III) phosphate
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Answer:

this one is hard

Explanation:

but it's iron because the sodium so yea there u go.

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What trend is seen in atom size, going down the periodic table?
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It is called Ionization Energy.
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