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3 years ago

Which of the following reactions would be predicted by the activity series list

Chemistry

2 answers:

goldfiish [28.3K]3 years ago

5 0

Answer:

The answer is B) A metal replaces a metallic ion below it on the list.

Explanation:

I just did it and got it correct, luckily I didn't use the other answer posted for this question.

den301095 [7]3 years ago

3 0

Answer:

it's a D answer if it's wrong please can you understand my question please

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The half-life of plutonium-239 is 24300. If a nuclear bomb released 8kg of this isotope, how many years would pass before the am

Aneli [31]

Answer:

= 72900 years

Explanation:

The half-life is the time taken by a radioactive material to decay by half the original amount.
The half-life of plutonium-239 is 24300 years which means it takes 24300 years to decay by half the original amount.

To calculate the time taken for a mass of 8 kg to decay to 1 kg we use;

New mass = Original mass x (1/2) ^n, where n is the number of half-lives

Therefore;

1 kg = 8 kg × (1/2)^n

1/8 = (1/2)^n

solving for n;

n =3

Therefore;

Time = 3 × 24300 years

= 72900 years

It will, therefore, take 72900 years for 8 kg of plutonium-239 to decay to 1 kg.

3 0

3 years ago

Which is an example of a physical change?

levacccp [35]

Answer:

salt dissolving

Explanation:

Hope this helps!

8 0

2 years ago

Read 2 more answers

Be sure to answer all parts. In the average adult male, the residual volume (RV) of the lungs, the volume of air remaining after

Alenkinab [10]

Answer:

For a: The number of moles of air present in the RV is 0.047 moles

For b: The number of molecules of gas is $2.83\times 10^{22}$

Explanation:

For a:

To calculate the number of moles, we use the equation given by ideal gas follows:

$PV=nRT$

where,

P = pressure of the air = 1.00 atm

V = Volume of the air = 1200 mL = 1.2 L (Conversion factor: 1 L = 1000 mL)

T = Temperature of the air = $37^oC=[37+273]K=310K$

R = Gas constant = $0.0821\text{ L. atm }mol^{-1}K^{-1}$

n = number of moles of air = ?

Putting values in above equation, we get:

$1.00atm\times 1.2L=n_{air}\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 310K\\n_{air}=\frac{1.00\times 1.2}{0.0821\times 310}=0.047mol$

Hence, the number of moles of air present in the RV is 0.047 moles

For b:

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules.

So, 0.047 moles of air will contain $(0.047\times 6.022\times 10^{23})=2.83\times 10^{22}$ number of gas molecules.

Hence, the number of molecules of gas is $2.83\times 10^{22}$

7 0

2 years ago

How does the displacement moved affect the amount of work done?

Sholpan [36]

The displacement affect the amount of work done by the fact that more displacement implies more work.

Option B

Explanation:

Work can be defined as the "measure of energy transfer" that occurs when an object is moved over a distance by an external force which is applied in the "direction of the displacement".

Work can be formulated as,

$W = (F \times s)\ N / m \\ \\Work = ( Force \times Displacement )\ Newton/meter$

From the above-mentioned formula, we can infer that Work is directly proportional to the displacement of the object.Therefore, more the work is more will be its displacement.

6 0

3 years ago

Is the formation of acid rain an exothermic or endothermic reaction?

Monica [59]

It is an exothermic reaction

4 0

3 years ago