3 years ago

Chemical reactions that ____ energy will not occur without a source of energy

Chemistry

1 answer:

andrezito [222]3 years ago

4 0

Chemical reactions that release energy will not occur without a source of energy. So the answer is release.

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How are genes and alleles related

Montano1993 [528]

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7 0

3 years ago

Zn-64 = 48.63%

Ann [662]

Answer:

A = 65.46 u

Explanation:

Given that,

The composition of zinc is as follows :

Zn-64 = 48.63%

Zn-66 = 27.90%

Zn-67 = 4.10%

Zn-68 = 18.75%

Zn-70 = .62%

We need to find the average atomic mass of the given element. It can be solved as follows :

$A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u$

So, the average atomic mass of zinc is 65.46 u.

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2 years ago

Which statements are true in regard to the VSEPR theory?

Naddik [55]

The correct option is D. 2) Anti-bonding electrons or lone pairs. These lone pairs, and bonds helps to form the shape which keeps these electrons separate as possible.

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2 years ago

Calculate the average atomic mass of boron (B), which has two isotopes: B-10 with 19.9% natural abundance, and B-11 with 80.1% a

lina2011 [118]

Answer:

The average atomic mass of boron is found to be

10.80

Explanation:

also u answered it urself

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3 years ago

Why is the mass of an iron atom different from the mass of a copper atom?

Jobisdone [24]

They have different number of Neutrons and protons, so their masses are different

Hope this helps!

6 0

3 years ago