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3 years ago

How long does it take water to turn into ice in the freezer?

Chemistry

1 answer:

vagabundo [1.1K]3 years ago

3 0

It would typically be around 5000 seconds(83.33) minutes for the water to freeze.

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The addition of 250.0 J to 30.0 g of copper initially at 22.0°C will change its temperature to what final value? (Specific heat

WINSTONCH [101]

Answer:

Final temperature = $43.53^{\circ} C$

Explanation:

Given that,

Heat added, Q = 250 J

Mass, m = 30 g

Initial temperature, T₁ = 22°C

The Specific heat of Cu= 0.387 J/g °C

We know that, heat added due to the change in temperature is given by :

$Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_2=\dfrac{Q}{mc}+T_1$

Put all the values,

$T_2=\dfrac{250}{30\times 0.387}+22\\\\=43.53^{\circ} C$

So, the final temperature is equal to $43.53^{\circ} C$ .

8 0

3 years ago

The electrons that are in the outermost electron shell, also known as the ____________ , have ____________ energy than those in

Tamiku [17]

The electrons that are in the outermost electron shell, also known as the valence shell, have more energy then those in the inner electron shells, I hope this helps<3

8 0

2 years ago

What is the solubility of ethylene (in units of grams per liter) in water at 25 °C, when the C2H4 gas over the solution has a pa

vredina [299]

<u>Answer:</u> The solubility of ethylene gas in water is $9.16\times 10^{-2}g/L$

<u>Explanation:</u>

To calculate the molar solubility, we use the equation given by Henry's law, which is:

$C_{C_2H_4}=K_H\times p_{C_2H_4}$

where,

$K_H$ = Henry's constant = $4.78\times 10^{-3}mol/L.atm$

$C_{C_2H_4}$ = molar solubility of ethylene gas = ?

$p_{C_2H_4}$ = partial pressure of ethylene gas = 0.684 atm

Putting values in above equation, we get:

$C_{C_2H_4}=4.78\times 10^{-3}mol/L.atm\times 0.684atm\\\\C_{C_2H_4}=3.27\times 10^{-3}mol/L$

Converting this into grams per liter, by multiplying with the molar mass of ethylene:

Molar mass of ethylene gas = 28 g/mol

So, $C_{C_2H_6}=3.27\times 10^{-3}mol/L\times 28g/mol=9.16\times 10^{-2}g/L$

Hence, the solubility of ethylene gas in water is $9.16\times 10^{-2}g/L$

6 0

4 years ago

7. Which of the following is true about rocks?

alex41 [277]

Answer:

most rocks are a mixture of minerals

4 0

3 years ago

Matter is everywhere around us. Make a list by nameof fifteen different kinds of matter that you encounter every day. Your list

Dmitry [639]

Solids: wood, plastic, metals

Liquids: water (H2O), soap, juice, milk

Gases: Air, water vapour (H2O), carbon dioxide (CO2)

An element: gold, silver, aluminum, copper, nickel, iron, nitrogen in the air

A compound: salt (NaCl), carbon dioxide (CO2)

A homogenous mixture: air, water with sugar or salt dissolved in it

A heterogeneous mixture: orange juice with pulp, cereal in milk

Pure substances: diamond, water, salt, baking soda, sugar

6 0

3 years ago