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vova2212 [387]
3 years ago
12

1.) How many significant figures are in the following number 0.001040 nm

Chemistry
1 answer:
r-ruslan [8.4K]3 years ago
8 0
B is the answererrrr 2
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Which of the following lists the correct symbol for the ion that tin forms when it loses 2 electrons, the correct classification
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Answer:

\huge\boxed{\sf Option \ A}

Explanation:

The symbol for TIN is Sn.

When Sn loses 2 electrons, it gets a double positive charge ( +2 ) and becomes \sf Sn ^{+2}.

It becomes a cation.

The name of Ion is Tin ( II ) Ion.

\rule[225]{225}{2}

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Calculate the number of moles of KOH in 6.70 mL of a 0.480 M KOH solution. (Enter your answer in scientific notation.)
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Answer:

3.2×10^-3 mol

Explanation:

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The question gives you the volume in mL, so to convert "mL" to "L" you need to divide by 1000. (6.70mL/ 1000L)= 0.0067L.

Now you can plug the numbers into the equation. 0.480M= n/ 0.0067L), multiply (0.480M×0.0067L)= 0.003216 mol. The scientific notation is 3.2×10^-3, 10^-3 because you move the decimal back three times and 3.2 because there are 2 sig figs.

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