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konstantin123 [22]

3 years ago

15

The picture below shows a warm air mass caught between two cooler air masses. What is this type of front called? Plz, I really n

eed help.

1 answer:

pentagon [3]3 years ago

6 0

An occluded front forms when a warm air mass is caught between two cooler air masses.

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The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

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After 1 half life its half the element
after 2 hl its quarter remaining
after 3 hl its half the quarter which is 1 eighth
after 3 half lifes

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Calcium chloride contains only calcium and chloride. What is the formula for this compound?

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Calcium chloride contains only one calcium and 2 chloride atom thus it's ionic formula would be CaCl2.

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Which of the following pairs of elements is most likely to form an ionic compound?

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magnesium and sodium because they are minerals and part of iron

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For which of the following activities might you want to hire a chemist?

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I have 2 samples of solid chalk (aka calcium carbonate). Sample A has a total mass of 4.12 g and Sample B has a total mass of 19

IRINA_888 [86]

Answer:

A) Sample B has more calcium carbonate molecules

Explanation:

M = Molar mass of calcium carbonate = 100.0869 g/mol

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

For the 4.12 g sample

Moles of a substance is given by

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{4.12}{100.0869}\\\Rightarrow n=0.0411\ \text{mol}$

Number of molecules is given by

$nN_A=0.0411\times 6.022\times 10^{23}=2.48\times 10^{22}\ \text{molecules}$

For the 19.37 g sample

$n=\dfrac{19.37}{100.0869}\\\Rightarrow n=0.193\ \text{mol}$

Number of molecules is given by

$nN_A=0.193\times 6.022\times 10^{23}=1.16\times 10^{23}\ \text{molecules}$

$1.16\times 10^{23}\ \text{molecules}>2.48\times 10^{22}\ \text{molecules}$

So, sample B has more calcium carbonate molecules.

The ratio of the elements of carbon, oxygen, calcium atoms, ions, has to be same in both the samples otherwise the samples cannot be considered as calcium carbonate. Same is applicable for impurities. If there are impurites then the sample cannot be considered as calcium carbonate.

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3 years ago