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3 years ago

How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior?

Chemistry

2 answers:

Elodia [21]3 years ago

8 0

Answer:

Radioactive elements near the core release heat as their nuclei decay. ... Radioactive elements absorb the cold temperatures underground

Rufina [12.5K]3 years ago

4 0

Answer:

the answer is c

Explanation:

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What is the boiling point of a solution produced by adding 610 g of cane sugar (molar mass 342.3 g/mol) to 1.4 kg of water? For

wel

Answer:

Boiling point of solution is $100.65^{0}\textrm{C}$

Explanation:

Cane sugar is a non-volatile solute.

According to Raoult's law for a non-volatile solute dissolved in a solution-

$\Delta T_{b}=K_{b}.m$

Where, $\Delta T_{b}$ is elivation in boiling point of solution, $K_{b}$ is ebbulioscopic constant of solvent (how much temperature is raised for dissolution of 1 mol of non-volatile solute) and m is molality of solution.

Here, $K_{b}=0.51^{0}\textrm{C}.kg.mol^{-1}$

610 g of cane sugar = $\frac{610}{342.3}$ moles of cane sugar

= 1.78 moles of cane sugar

So, molality of solution (m) = $\frac{1.78}{1.4}mol.kg^{-1}=1.27mol.kg^{-1}$

Plug in all the values in the above equation, we get-

$\Delta T_{b}=0.51^{0}\textrm{C}.kg.mol^{-1}\times 1.27mol.kg^{-1}=0.65^{0}\textrm{C}$

So, boiling point of solution = $(100+0.65)^{0}\textrm{C}=100.65^{0}\textrm{C}$

7 0

3 years ago

Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than i

ziro4ka [17]

Answer:

d) Ni < Co < Fe < Zn < Al

Explanation:

electronegativity of Aluminium 1.6

electronegativity of Zinc 1.7

electronegativity of iron 1. 83

electronegativity of Cobalt 1.88

electronegativity of Nickel 1.91

As the electronegativity of aluminium is lower as compared to other, so it will have high tendency to easily lose electron and that is why Aluminium is more reactive than the other mentioned

8 0

3 years ago

The constant k for a certain reaction is measured at two different temperatures:Temperature K376.0°C 4.8x 10^8280.0°C 2.3 x 10^8

zaharov [31]

Answer:

Explanation:

548888

3 0

4 years ago

In a bulleted list, why is it important to have accurate and precise graphs that

nasty-shy [4]

The reason being is because it help you better understand what is going on on the graph and help you answer the questions on the graph. hope this helps:)

4 0

4 years ago

Read 2 more answers

Name the chemical reaction HCI +<br> NaOH → NaCl +<br> H20

Arte-miy333 [17]

Answer:

Neutralization reaction

Explanation:

This reaction involve an acid (HCl) reacting with a base (NaOH), producing a salt (NaCl) and water. Therefore it's a neutralization reaction.

7 0

3 years ago