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2 years ago

H2 H2O H2O2 CH4 All four examples represent

Chemistry

2 answers:

miv72 [106K]2 years ago

8 0

It is covalent bonds

satela [25.4K]2 years ago

7 0

Answer: molecules

Justification:

1) Given formulas: H₂, H₂O, H₂O₂, CH₄.

2) A molecule is the chemical combination of two or more atoms through covalent bonds.

3) Non-metals only can bond among them by covalent bond, i.e. by sharing electrons.

Two nonmetals cannot bond to each other in other way (ionic bonds) because any of them will not be willing to release an electron completely.

Since the two nonmetal elements just need a few more electrons to complete their respective valence electron shell, they will do it by sharing electrons instead of releasing them.

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Carbon-14 (14C) dating assumes that the carbon dioxide on the Earth today has the same radioactive content as it did centuries a

Nataly [62]

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Explanation:

The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = 5715 years

Putting values in above equation, we get:

$k=\frac{0.693}{5715yrs}=1.21\times 10^{-4}yrs^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $1.21\times 10^{-4}yr^{-1}$

t = time taken for decay process = ? yr

$[A_o]$ = initial amount of the sample = 100 grams

[A] = amount left after decay process = 13 grams

Putting values in above equation, we get:

$1.21\times 10^{-4}=\frac{2.303}{t}\log\frac{100}{13}\\\\t=16864.4yrs$

Hence, the tree was burned 16846.4 years ago to make the ancient charcoal

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Andrei [34K]

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VikaD [51]

Answer:

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3 years ago

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vazorg [7]

70.306 would be your answer.

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