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3 years ago

BRAINLIEST IF RIGHT

Chemistry

1 answer:

vampirchik [111]3 years ago

6 0

A or c probably I think a tho

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Atoms of which element have two protons and two electrons?

Len [333]

B.) Helium have <span>two protons and two electrons

Hope this helps!</span>

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3 years ago

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Which organisms use cellular respiration as a way to convert energy into usable form?

san4es73 [151]

Answer:they use cellular respiration to transform the glucose molecules they make into energy they can use for carrying out life's processes

Explanation:

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3 years ago

The fraction of a radioactive isotope remaining at time t is (1/2)^t/t1/2 where t1/2 is the half-life. If the half-life of carbo

Katena32 [7]

Answer:

a) $1.065\times 10^{-8}$ fraction of carbon−14 in a piece of charcoal remains after 14.0 years.

b) $0.000\times 10^{-3}$ fraction of carbon−14 in a piece of charcoal remains after $1.900\times 10^4 years$

c) $0.0000\times 10^{-4}$ fraction of carbon−14 in a piece of charcoal remains after $1.0000\times 10^5 years$ .

Explanation:

The fraction of a radioactive isotope remaining at time t is given by:

$[A]=\frac{(\frac{1}{2})^t}{t_{\frac{1}{2}}}$

Taking log both sides:

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

[A] = fraction at given time t

$t_{\frac{1}{2}}$ = half life of the carbon−14 =5,730 years

a)When , t = 14 years

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 14 years\times (-3010)-\log [5,730 years]$

$[A]=1.065\times 10^{-8}$

b)When , t = $1.900\times 10^4 years$

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 1.900\times 10^4 years\times (-3010)-\log [5,730 years]$

$[A]=0.000\times 10^{-3} [/tex$

c)When , t = $1.0000\times 10^5 years$

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 1.0000\times 10^5 years\times (-3010)-\log [5,730 years]$

$[A]=0.0000\times 10^{-4}$

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3 years ago

Which substance forms a 0.10 M aqueous solution with the highest pH? a. NaNO2 b. NaNO3 c. HNO3 d. NH4NO3 e. FeCl3

Mila [183]

D. NH4N03 Hope it helps

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3 years ago

You have a cotton towel, strips of tissue paper, and an aluminum pie plate to use in an experiment. Which of the following is a

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Answer:

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Explanation:

Did u find the answer !! It's on

my daughters homework !! I can't find it neither

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3 years ago