3 years ago

Which activity is an example of chemical change?

1 answer:

3 0

An old penny rusting, remember you can’t undo a chemical change

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kipiarov [429]

Answer:

You have to remember this memory aid, diagonals and all.

You have to keep a tight tally of the electrons you’ve used so far so you don’t go over the number of electrons in the element you’re working on.

You have to remember how many electrons fit into each subshell (s, p, d, f).

It takes a lot of time, especially when the element has more than 20 electrons.

Explanation:

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3 years ago

alexdok [17]

67.0 Should be th3 answer

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3 years ago

Lady_Fox [76]

Answer:

2 significant figures i.e. 2 and 7.

Explanation:

We need to find the number of significant figures in the given number i.e. $2.7\cdot10^{-3}$ .

It has 2 significant figures i.e. 2 and 7.

It means the power of 10 doesn't count in the significant figures.

Hence, there are 2 significant figures.

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jeka94

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GalinKa [24]

Answer:

Explanation:

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3 years ago