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Sloan [31]
4 years ago
14

A chemist carefully measures the amount of heat needed to raise the temperature of a sample of a pure substance from to . The ex

periment shows that of heat are needed. What can the chemist report for the specific heat capacity of the substance?
Chemistry
1 answer:
faust18 [17]4 years ago
5 0

Answer:

241 J/kg K.

Explanation:

From the complete question, the mass of the sample= 0.37 kg, Final temperature of the sample =14.5°C (287.5K), the Initial temperature of the sample = -1.2°C(271.8 K).

Therefore, the Change in temperature,∆T = final temperature of the sample - initial temperature of the sample.

Hence, ∆T= 287.5 - 271.8.

∆T= 15.7 K.

Using the formula below;

Q= MC∆T-----------------------------------(1).

Where M= mass of the sample= 0.37 kg, Q = the heat required to raise the temperature and C= specific heat capacity= 1.4 kJ= 1.4 × 1000 = 1,400 J.

Slotting in the values into equation (1) above, we have;

1400= 0.37 × C × 15.7K

1400= 5.809C.

C= 241.005336546737820.

Specific heat capacity,C;

= 241 J/kg K.

The chemist will report the specific heat capacity of the substance as 241 J/kg K.

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You break a pencil lead. Which statement is true?
aalyn [17]

Answer:

  • <em><u>A physical change has occurred, with no energy change.</u></em>

Explanation:

When a pencil lead is broken there is not change of any chemical properties, therefore it is not a chemical change, but just a physical change. In this case the change is just the number of pieces and dimensions.

Chemical changes always involve the formation of new different substances; the bonds between the atoms of the starting substances (reactants) breake and new bonds are formed leading to new substances (products) with different chemical composition (arrange of atoms). Chemical changes occur through chemical reactions.

Hence, if there is not change on the chemical composition, you think on physical changes. Physical changes include change in shape, size, state of matter (e.g. solid, liquid, gas). In the case of a pencil lead breaking, it is a change in shape and size.

Also, since energy has not been absorbed or released during the change, the energy of the pencil lead before having been broken is equal to the sum of the energies of the pieces of pencil lead obtained. So, this is a physical change with no energy changes.

Some examples of physical changes that include change in energy are the change of state (e.g. solid to liquid or liquid to gas) and the dissolution of a compound.

7 0
4 years ago
Choose the compound below that should have the highest melting point according to the ionic bonding model. Choose the compound b
Bingel [31]

Answer:

AlN has highest melting point among given.

Explanation:

As per ionic model, ionic compounds are held together by electrostatic force. The ionic compound having strong electrostatic force will have high melting point.

Electrostatic force is proportional to charge and size of constituent ions.

F=k \frac{q_+\times q_-}{r^2}

In case of MgO

Charge on Mg = +2

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F=-k \frac{(+2)\times (--2)}{r^2}=\frac{4k}{r^2}

In case of LiF

Charge on Li = +1

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F=-k \frac{(+1)\times (-1)}{r^2}=\frac{1k}{r^2}

In case of AlN

Charge on Al = +3

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F=-k \frac{(+3)\times (-3)}{r^2}=\frac{9k}{r^2}

In case of RbF

Charge on Rb = +1

Charge on F = -1

F=-k \frac{(+1)\times (-1)}{r^2}=\frac{1k}{r^2}

In case of CaS

Charge on Ca = +2

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F=-k \frac{(+2)\times (-2)}{r^2}=\frac{4k}{r^2}

As magnitude of electrostatic force is highest in AlN, therefor, it has highest melting point.

4 0
3 years ago
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Therefore, the equation for the reaction will be as follows.

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Here, HCO_{3}^{-} acts as a base as it is accepting a proton and HS^{-} acts as an acid because it is donating a proton.


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