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3 years ago

What Group is Zn (zinc) in? O A. 4 O B. 2A O C. 12 O D. 30

Chemistry

1 answer:

Oxana [17]3 years ago

3 0

I believe it’s (C.12)

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2 years ago

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NISA [10]

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2 years ago

What is the percent composition of hydrogen if a sample is found to contain 7 grams of hydrogen, 32 grams of nitrogen, and 7 gra

nata0808 [166]

Answer: The percent composition of hydrogen in the sample is 15.22 %

Explanation:

We are given:

Mass of hydrogen = 7 grams

Mass of nitrogen = 32 grams

Mass of carbon = 7 grams

Total mass of the sample = 7 + 32 + 7 = 46 grams

To calculate the percentage composition of hydrogen in sample, we use the equation:

$\%\text{ composition of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of sample}}\times 100$

Mass of sample = 46 g

Mass of hydrogen = 7 g

Putting values in above equation, we get:

$\%\text{ composition of hydrogen}=\frac{7g}{46g}\times 100=15.22\%$

Hence, the percent composition of hydrogen in the sample is 15.22 %

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2 years ago

When water freezes,it contracts true or false

Zigmanuir [339]

The correct answer is: False.
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Water expands (gets larger/ is less dense in solid form than in liquid form) when it freezes).
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3 years ago

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An atom with one valence electron combines with an atom with seven valence electrons. What is likely to happen to the atom with

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It will likely give up its valence electron to the other compound, forming stable octets on each of the newly formed ions. These ions have opposing charges, and tend to form strong ionic lattices. A good example of this is NaCl, which contains Na+ ions that have given up their one valence electron and Cl- ions which have accepted that electron.
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2 years ago