3 years ago

Pleaseeee Helppppp 55 Points Question Please Helppppppppp I begg everybody

Chemistry

1 answer:

I am Lyosha [343]3 years ago

8 0

Explanation:

I can´t see with out my glasses.

You might be interested in

When iron reacts with oxygen what substance is produced?

zhannawk [14.2K]

It will produce iron oxide

8 0

4 years ago

What happens if you mix lithium and aluminum together?

Dima020 [189]

Answer:

hello

Explanation:

do you meant something like that

5 0

4 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.

5 0

3 years ago

How are the molecules moving in a cold glass of water compared to in a warm glass of water

taurus [48]

Molecules move faster in a warm glass of water they move slower in a cold glass of water

4 0

3 years ago

I have a mass of 30 grams and a volume of 60 cm3 what is the density

Nesterboy [21]

I think it's 534 grams per cubic centimetre

7 0

3 years ago

Pleaseeee Helppppp 55 Points Question Please Helppppppppp I begg everybody ​

Pleaseeee Helppppp 55 Points Question Please Helppppppppp I begg everybody