Scientist use their knowledge of the half-life of carbon and uranium isotopes to measure the age of the rock or fossil .

Chemistry

1 answer:

marusya05 [52]3 years ago

8 0

They can use them to find the age of fossils.

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What is the percent by volume of a solution formed by mixing 15 mL of hydrochloric acid into water, forming 75 mL of solution?

timama [110]

Answer:

= 17% (v/v)

Explanation:

% by Volume = (Volume HCl / Volume of Solution)100%

= 15ml/(75ml + 15ml) x 100% = 16.66666667% (calculator answer)

= 17% (v/v) 2 sig figs. based on volume values given.

4 0

3 years ago

Which describes an atom of actinium?

Basile [38]

Answer:

Actinium is a chemical element with the symbol Ac and atomic number 89. A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation.

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3 years ago

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At a particular temperature, an equilibrium mixture the reaction below was found to contain 0.171 atm of I2, 0.166 atm of Cl2 an

maw [93]

Answer: 3390

Explanation:

Since this problem already gives is the equilibrium values, all we have to do is to plug them into the formula for $K_{p}$ .

$K_{p} =\frac{[ICl]^2}{[I_{2}][Cl_{2}] }$

$K_{p} =\frac{(9.81)^2}{(0.171)(0.166)} =3390$

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3 years ago

Of the following gases, ________ will have the greatest rate of effusion at a given temperature. Of the following gases, _______

kolezko [41]

<u>Answer:</u> From the given gases, the greatest rate of effusion is of $CH_4$

<u>Explanation:</u>

Rate of effusion of a gas is determined by a law known as Graham's Law.

This law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$