2 years ago

In one hour there are 3600 seconds. Convert 4.5 x 10^3 seconds to days.

Chemistry

1 answer:

GalinKa [24]2 years ago

7 0

Convert seconds into minutes then hours then days.

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Which describes the heliocentric model of the solar system? (1 point)

maw [93]

Answer:

Explanation:I alredy know this i am in 7th gread

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2 years ago

A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5

Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

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

$k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}$

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

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

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

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2 years ago

Advantage of modern perodic law

mario62 [17]

Answer:

it has made the study of chemistry systematic and easy. it acts as an aid to memory

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2 years ago

For which of the following reactions are both reactants and products likely to be found when the reaction appears to be complete

Scorpion4ik [409]

The answer is
HF + H2O <--> H3O(+) + F(-)

HF + H2O gives H3O(+) + F(-)
and 
H3O(+) + F(-) gives HF + H2O
it is a reciprocal reacation, so 
reactions are both reactants and products

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3 years ago

All of the covalent carbon-carbon bonds in unsaturated hydrocarbons share 2 pairs of electrons.

Evgen [1.6K]

False. carbon-carbon bonds that share 2 pairs of electrons are double bonds. An unsaturated hydrocarbon isnt necessary to only have double bonds. they can also have single bonds or triple bonds.

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3 years ago

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