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agasfer [191]
2 years ago
6

An experiment was conducted to determine the density of a rock sample. The table shows a partial record of the experiment.

Chemistry
1 answer:
mart [117]2 years ago
5 0

Answer: the density of the rock

55.91g/ml

Explanation:

The density of the rock after it had being placed in the cylinder of water so the calculation should look like this:

Volume of water substract the mass of the rock:

And that is 142.5 ml - 86.59g =

Answer 55.91 g/ml

So the density of the rock is 55.91g/ml

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How do the mass and height of an object affect the gravitational potential energy?
marin [14]

Answer:

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Explanation:

Both mass and height have the same effect on the gravitational potential energy of body.

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3 years ago
How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value?4247.56.56
neonofarm [45]

Answer:

6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.

Explanation:

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given:

Concentration is decreased to 1.56 % which means that 0.0156 of [A_0] is decomposed. So,

\frac {[A_t]}{[A_0]} = 0.0156

Thus,

\frac {[A_t]}{[A_0]}=e^{-k\times t}

0.0156=e^{-k\times t}

kt = 4.1604

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Half life = 15.0 hours

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k=\frac {ln\ 2}{t_{1/2}}

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<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>

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