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3 years ago

As temperature of this substance rises from 20°C to 50°C, the substance _ heat and its kinetic energy ___ .

Chemistry

2 answers:

boyakko [2]3 years ago

7 0

Answer: Option (A) is the correct answer.

Explanation:

When a substance absorbs heat energy then there will occur an increase in the temperature of the substance.

And, as there is occurring an increase in the temperature of substance. Kinetic energy is related to temperature as follows.

$K.E \propto \frac{3}{2}kT$

Hence, with increase in temperature there will also be increase in kinetic energy of the molecules of a substance.

Thus, we can conclude that as temperature of this substance rises from $20^{o}C$ to $50^{o}C$ , the substance absorbs heat and its kinetic energy increases.

bonufazy [111]3 years ago

5 0

Hello!

I think the answer to this question would be A) Absorbs; Increases.

I hope this is correct, and it helps you out! c:

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What is the freezing point (in degrees Celcius) of 3.75 kg of water if it contains 189.9 g of C a B r 2?

blondinia [14]

Answer:

The freezing point of the solution is -1.4°C

Explanation:

Freezing point decreases by the addition of a solute to the original solvent, <em>freezing point depression formula is:</em>

ΔT = kf×m×i

<em>Where Kf is freezing point depression constant of the solvent (1.86°C/m), m is molality of the solution (Moles CaBr₂ -solute- / kg water -solvent) and i is Van't Hoff factor.</em>

Molality of the solution is:

-moles CaBr₂ (Molar mass:

189.9g ₓ (1mol / 199.89g) = 0.95 moles

Molality is:

0.95 moles CaBr₂ / 3.75kg water = <em>0.253m</em>

Van't hoff factor represents how many moles of solute are produced after the dissolution of 1 mole of solid solute, for CaBr₂:

CaBr₂(s) → Ca²⁺ + 2Br⁻

3 moles of ions are formed from 1 mole of solid solute, Van't Hoff factor is 3.

Replacing:

ΔT = kf×m×i

ΔT = 1.86°C/m×0.253m×3

ΔT = 1.4°C

The freezing point of water decreases in 1.4°C. As freezing point of water is 0°C,

<h3>The freezing point of the solution is -1.4°C</h3>

<em />

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3 years ago

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Hoochie [10]

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3 years ago

How many grams are in 2.30 x 10^23 atoms in Na?

aksik [14]

There are 8.786 g

<h3>Further explanation </h3>

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

2.30 x 10²³ atoms in Na :

$\tt mol=\dfrac{2.3\times 10^{23}}{6.02\times 10^{23}}=0.382$

mass :

$\tt mass=mol\times Ar~Na\\\\mass=0.382\times 23=8.786~g$

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3 years ago

What is the volume of 1.5 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)?

seropon [69]

V = 33.6 L hope this helps

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4 years ago

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How many atoms of oxygen are present in the reactants<br> 6CO2+6H2O=C6H12O6+6O2

cricket20 [7]

Answer:

3.6132 * 10^24 atoms/molecules of 02

Explanation:

When we look at the balanced chemical equation, we can see that there are 6 moles of O2.

In order to convert from moles to formula units (atoms and molecules),

you need to multiply by avogadro's number.

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3 years ago

As temperature of this substance rises from 20°C to 50°C, the substance _______ heat and its kinetic energy _________ .

As temperature of this substance rises from 20°C to 50°C, the substance _ heat and its kinetic energy ___ .