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3 years ago

Please help

Chemistry

1 answer:

photoshop1234 [79]3 years ago

4 0

Answer:

Atomic radius is directly proportional to Metallic reactivity in group 2.

Explanation:

Atomic radius is directly proportional to Metallic reactivity in group 2.

As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.

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2 years ago

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3 years ago

During laparoscopic surgery , carbon dioxide gas is used to expand the abdomen to help create a larger working space. If 4.80 L

Studentka2010 [4]

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Explanation:

To solve this problem we need to use the PV=nRT equation.

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3 years ago

A sample originally contained 1.28 g of a radioisotope. It now contains 1.12 g of its daughter isotope.

dexar [7]

The answer is 3.

The relation between number of half-lives (n) and decimal amount remaining (x) can be expressed as:

 $(1/2) ^{n} =x$

We need to calculate n, but we need x to do that. To calculate what percentage of a radioactive species would be found as daughter material, we must calculate what amount remained:
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If 1.28 is 100%, how much percent is 0.16:
1.28 : 100% = 0.16 : x
x = 12.5%
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x = 0.125

Now, let's implement this in the equation:

 $(1/2) ^{n} =0.125$

Because of the exponent, we will log both sides of the equation:
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Therefore, 3 half-lives have passed since the sample originally formed.

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3 years ago

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