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Nataly_w [17]
2 years ago
5

The only sure evidence for chemical reaction is

Chemistry
2 answers:
3241004551 [841]2 years ago
8 0
...Is that one or more new substances are produced
omeli [17]2 years ago
3 0
When things explode
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Which of those depend on mayfly nymphs. In other terms which animal eats mayfly nymphs?

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10) Give two example of where you would find elements in our daily lives.
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3 years ago
Perform the following mathematical operation and express the results to the correct number of significant figures. (0.102 x 0.08
Kobotan [32]

Answer:

<u>2.26 </u>

<u></u>

Explanation:

First you should know what are significant figures,

1 . All non - zero digits are significant.

2 . The zero between two non-  zero are significant.Ex 302 has 3 significant figures.

3. The zero before the decimal and before any non-zero digit is non significant. Example : 0.003 has only 1 significant figure.

4. The zero after non zero are non - significant . But the zeros after the decimal point are significant.

300 has only 1 significant figure

300.0 has 4 significant figure

The least number of significant figures present in the number should be there in the final answer of the calculation.

Look at the number having minimum significant digits :

It is 3 (every number has 3- significant figures ) So the answer should also contain 3 - significant figures.

\frac{0.102\times 0.0821\times 273}{1.01}

First solve the numerator part

\frac{2.285}{1.01}

=2.2635

Round off this number to 3 significant figures.

Answer is =<u> 2.26</u>

It has 3 - significant digit since all the digits are non-zero.

5 0
2 years ago
Time zones were adopted to fix what problem
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Time Zones were adopted to fix the time. Without the time zone, you will never know what time it is

8 0
3 years ago
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A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which
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dissolving sugar in water

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Explanation: these both have chemical and physical changes happening to them.

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3 years ago
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