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Allushta [10]
3 years ago
15

26.2 g piece of copper metal is heated from 21.5°C to 201.6°C. Calculate the amount of heat absorbed by the metal. The specific

heat of Cu is 0.385 /g "C.

Chemistry
1 answer:
Nuetrik [128]3 years ago
6 0

Answer:1816.6 joules

Explanation:see the attached photo

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HELP ASAP PLEASE!!!! 30 POINTS
valentina_108 [34]

Answer:

it's option c

Explanation:

because if I'm not wrong I have learned these type of questions back 11 and I remember that rutherfords observation was few alpha particles were deflected by small angles.

5 0
3 years ago
Read 2 more answers
: How does the solubility of a solid in a liquid depend on temperature? How is this temperature dependence exploited to purify s
ehidna [41]

Answer:

Explanation:

Solubility of many solid in a solvent increases with increase in temperature. Increase in temperature increases kinetic energy of the solute, increasing collision and weakens the intermolecular force within the solute. This makes the solute dissolve faster in their solvents.

During recrystallization, more solutes are added to the solvent at higher temperature so that a supersaturated solution is produced on cooling. As the solution cools the over saturated solute begins to precipitate out of the solution.

Recrystallization is a form of purification if solid, as the crystalline solids continue to precipitate it reject impurities are comes out as a purer solid

3 0
3 years ago
Which of the following describes the relationship between acid strength and ka value for weak acids?
Leona [35]
I think the correct answer would be when ka increases, the acid strength increases. Ka is the product of hydronium ions and the [A-] ions  concentration over the acid concentration. Therefore, increasing the the Ka, the numerator in the definition would increase as well which correspondingly increase the strength of the acid.
8 0
3 years ago
Valency of silicate , ammonium, hydroxide, phosphate, nitrate, bisuphate ?​
Mekhanik [1.2K]

Answer:

Answer

Sodium phosphate−Na

3

PO

4

Aluminium chloride−AlCl

3

Calcium oxide−CaO

Potassium nitrate−KNO

3

Ammonium hydroxide−NH

4

OH

6 0
3 years ago
An unknown solid is entirely soluble in water. On addition of dilute HCl, a precipitate forms. After the precipitate is filtered
Karo-lina-s [1.5K]

Answer:

Pb(NO3)2

Cd(NO3)2

Na2SO4

Explanation:

In the first part, addition of HCl leads to the formation of PbCl2 which is poorly soluble in water. This is the first precipitate that is filtered off.

When the pH is adjusted to 1 and H2S is bubbled in, CdS is formed. This is the second precipitate that is filtered off.

After this precipitate has been filtered off and the pH is adjusted to 8, addition of H2S and (NH4)2HPO4 does not lead to the formation of any other precipitate.

The yellow flame colour indicates the presence of Na^+ which must come from the presence of Na2SO4.

5 0
2 years ago
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