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3 years ago

B. 10% is the correct answer

Chemistry

2 answers:

worty [1.4K]3 years ago

8 0

No it’s c bro so change your answer

GarryVolchara [31]3 years ago

5 0

No the right answer is c

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A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram

Fiesta28 [93]

Answer:

6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

$N= N_0(\frac{1}{2})^n$

where

$n = \frac{t}{t_{\frac{1}{2}}}$

here

t = 458,000 years

$t_{\frac{1}{2}}$ = 229,000

$\frac{t}{t_{\frac{1}{2}}}$ = \ $\frac{ 458,000}{229,000}$

n = $\frac{t}{t_{\frac{1}{2}}}$ = 2.000

Now substituting the values

$1.675 = N_0(\frac{1}{2})^{2.000}}$

$1.675 = N_0\times (0.2500)$

$N_0= \frac{1.675}{0.2500}$

$N_0=6.70$

3 0

3 years ago

When an oxygen atom is attached to a carbon atom the carbon atom becomes more?

Ad libitum [116K]

When an oxygen atom is attached to a carbon atom, the carbon atom becomes reduced.

5 0

3 years ago

Read 2 more answers

30 POINTS PLEASE HELP ASAP

lina2011 [118]

Hello!

We have the following data:

f (radiation frequency) = $3.0*10^{19}\:Hz$

v (speed of light) = $3.0*10^8\:m/s$

λ (wavelength) = ? (in m)

Let's find the wavelength, let's see:

$f = \dfrac{v}{\lambda}$

$3.0*10^{19} = \dfrac{3.0*10^8}{\lambda}$

$\lambda = \dfrac{3.0*10^8}{3.0*10^{19}}$

$\boxed{\boxed{\lambda = 1*10^{-11}\:m}}\Longleftarrow(wavelenght)\end{array}}\qquad\checkmark$

I Hope this helps, greetings ... DexteR! =)

4 0

3 years ago

Why should atom or ions join together to form compounds?

SCORPION-xisa [38]

Answer:

while atoms form together, they percentage their outermost electrons to create more sustainable strength states. This sharing bonds the atoms into an ionic shape or a molecule

Explanation:

i hope this help a little

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3 years ago

Bacteria and archaea are examples<br> of ...

USPshnik [31]

Answer:

prokaryotes

Explanation:

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3 years ago