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4 years ago

A body cools from 60°C to 50°C in 10 minutes. Find its temperature(in °C) at the end of next 10 minutes

Chemistry

1 answer:

Len [333]4 years ago

6 0

Answer:

40 degrees Celsius

Explanation:

In this kind of question, we need to know what is called a temperature gradient. This means we need to know how the temperature changes with time.

To calculate this , we subtract the initial temperature from the final temperature so that we get the total temperature change. Afterwards, we can now divide the total temperature change by the time taken so we get the gradient.

The total temperature change is 10 degrees celcius. The gradient is 10 degrees Celsius divided by 10 minutes which is equal to 1 degree Celsius per minute. Hence, we conclude that the temperature drops at a rate of 1 degree Celsius per minute.

At the end of next ten minutes, we have a temperature drop of another 10 degrees Celsius. If we subtract this from the final temperature I.e 50, this means we now have a new final temperature of 40 degrees Celsius

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Which of the following can form a hydrogen bond with the HF molecule?

Lostsunrise [7]

Answer:

helium

(He)

Explanation:

helium

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3 years ago

What did the photoelectric experiment demonstrate?

arlik [135]

Explanation:

When an electromagnetic wave like light hits a material, the electrons gets emitted. The emission of electrons is called photoelectric effect. The emitted electrons are called photoelectrons. In this process the transfer of energy takes place from light to an electron.

Hence, the correct option regarding the photoelectric experiment is (A) " Light can cause electrons to be released from the surface of a metal."

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4 years ago

The rate of diffusion of gas A is double the rate of gas B. The ratio of their molecular weight is

Dafna1 [17]

Answer:

Ratio is 4:1

Explanation:

from graham's law of gaseous diffusion:

${ \bf{ \frac{R _{A} }{R_{B} } = \sqrt{ \frac{M_{A} }{M_{B}} } }}$

but Ra = 2Rb:

${ \sf{ (\frac{2}{1} ) {}^{2} = \frac{M _{A}}{M _{B} } }} \\ \\ { \sf{\frac{M _{A}}{M _{B} } = \frac{4}{1} }} \\ \\ {M _{A}} : {M _{B} } = 4 :1$

4 0

3 years ago

When 15.0 mL of a 6.42×10-4 M sodium sulfide solution is combined with 25.0 mL of a 2.39×10-4 M manganese(II) acetate solution d

Artist 52 [7]

Answer:

Q = 3.59x10⁻⁸

Yes, precipitate is formed.

Explanation:

The reaction of Na₂S with Mn(CH₃COO)₂ is:

Na₂S(aq) + Mn(CH₃COO)₂(aq) ⇄ MnS(s) + 2 Na(CH₃COO)(aq).

The solubility product of the precipitate produced, MnS, is:

MnS(s) ⇄ Mn²⁺(aq) + S²⁻(aq)

And Ksp is:

Ksp = 1x10⁻¹¹= [Mn²⁺] [S²⁻]

Molar concentration of both ions is:

[Mn²⁺] = 0.015Lₓ (6.42x10⁻⁴mol / L) / (0.015 + 0.025)L = 2.41x10⁻⁴M

[S²⁻] = 0.025Lₓ (2.39x10⁻⁴mol / L) / (0.015 + 0.025)L = 1.49x10⁻⁴M

Reaction quotient under these concentrations is:

Q = [2.41x10⁻⁴M] [1.49x10⁻⁴M]

Q = 3.59x10⁻⁸

As Q > Ksp, the equilibrium will shift to the left producing MnS(s) the precipitate

8 0

4 years ago

What is the molar mass of chlorine?

aalyn [17]

Molar mass Chlorine ( Cl ) = 35.45 g/mol

hope this helps!

4 0

3 years ago