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4 years ago

What percent of an original sample remains after 3 half-lives? After 5 half-lives?

Chemistry

1 answer:

Salsk061 [2.6K]4 years ago

7 0

Answer:

Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained. And the percentage of quantity of a radioactive material that remains after 5 half-lives will be . ∴NN0×100=10032=3.125.

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The class measured the density of a copper block to be 8.6 +/-0.2 g/cm3 at the 95% confidence interval with a standard deviation

mezya [45]

Answer: kindly check explanation

Explanation:

Given the following :

Measured density of copper block:

8.6+/-0.2 g/cm3

True density = 8.96g/cm3

Standard deviation = 0.4g/cm

a. What is the high and low number of the confidence interval range?

High : 8.6 + 0.2 g/cm3 = 8.8g/cm³

Low : 8.6 - 0.2 g/cm3 = 8.4g/cm³

Does the true value fall within the confidence interval? NO

Actual density = 8.96g/cm³ doses not lie in between (8.4 - 8.8)g/cm³

B.) High and low of the standard deviation range?

High = 8.6 + 0.4 = 9.0g/cm³

Low = 8.6 - 0.4 = 8.2g/cm³

Value falls within range of the true density value of copper block.

8.96g/cm³ falls in-between (8.2-9.0)g/cm³

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3 years ago

True or False? Limiting cultivation increases compaction.

solmaris [256]

I believe the answer is true

3 0

3 years ago

[Gradpoint-Question AK-3] Acid is added to a beaker containing crushed marble. What effect does stirring this mixture have on th

Evgen [1.6K]

A : The number of particle collision increases

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3 years ago

Read 2 more answers

The reactant side of a balanced chemical equation is shown below.

Tresset [83]

Answer: There are 8 hydrogen atoms on the product side in the reaction.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This law also states that total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side.

For the given reaction, the balance chemical equation follows:

$PCl_5+4H_2O\rightarrow H_3PO_4+5HCl$

On reactant side:

Number of Phosphorus atoms = 1

Number of Chlorine atoms = 5

Number of Hydrogen atoms = 8

Number of Oxygen atoms = 4

On Product side:

Number of Phosphorus atoms = 1

Number of Chlorine atoms = 5

Number of Hydrogen atoms = 8

Number of Oxygen atoms = 4

Hence, there are 8 hydrogen atoms on the product side in the reaction.

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3 years ago

Which two properties are explained by the pool-of-shared-electrons model for metals?

Svetllana [295]

I believe it is C but if not that A

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3 years ago