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2 years ago

What happens when the temperature changes from cold to hot in most substances

Chemistry

2 answers:

mihalych1998 [28]2 years ago

6 0

Explanation:

As the temperature of a solid, liquid or gas increases, the particles move more rapidly. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid. If a liquid is heated sufficiently, it forms a gas.

amm18122 years ago

4 0

Answer:

<h2>When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... Solids, liquids and gases all expand when heat is added.☺</h2>

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A sample of gas occupies a volume of 72.0 mL . As it expands, it does 141.2 J of work on its surroundings at a constant pressure

bagirrra123 [75]

The final volume of the gas is 73.359 mL

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Given :

A sample gas has an initial volume of 72.0 mL

The work done = 141.2 J

Pressure = 783 torr

The objective is to determine the final volume of the gas.

Since, the process does 141.2 J of work on its surroundings at a constant pressure of 783 Torr. Then, the pressure is external.

Converting the external pressure to atm; we have

External Pressure P $ext$ :

$P ext$ = 783 torr × $\frac{1 atm}{760 torr}$

$Pext$ = 1.03 atm

The work done W = $Pext V$

The change in volume ΔV= $\frac{W}{Pext}$

ΔV = $\frac{141.2 J \frac{1 L atm}{101.325 J} }{1.03 atm}$

ΔV = $\frac{0.0014}{1.03}$

ΔV = 0.001359 L

ΔV = 1.359 mL

The initial volume = 72.0 mL

The change in volume V is ΔV = V₂ - V₁

- V₂ = - ΔV - V₁

multiply both sides by (-), we have:

V₂ = ΔV + V₁

= 1.359 mL + 72.0 mL

= 73.359 mL

Therefore, the final volume of the gas is 73.359 mL .

Learn more about volume here:

brainly.com/question/27100414

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3 0

1 year ago

The concentrations of Fe and K in a sample of riverwater are 0.0400 mg/kg and 1.30 mg/kg, respectively. Express the concentratio

Ierofanga [76]

Answer :

The concentration in molality of Fe is, $7.1\times 10^{-7}mol/kg$

The concentration in molality of K is, $3.3\times 10^{-5}mol/kg$

Explanation:

First we have to calculate concentration in molality of Fe.

Molar mass of Fe = 56 g/mol

Concentration of Fe = 0.0400 mg/kg = $4\times 10^{-5}g/kg$

Conversion used : 1 g = 1000 mg

$\text{Concentration in molality}=7.1\times 10^{-7}mol/kg$

Thus, the concentration in molality of Fe is, $7.1\times 10^{-7}mol/kg$

Now we have to calculate concentration in molality of K.

$\text{Concentration in molality}=\frac{\text{Concentration of K}}{\text{Molar mass of K}}$

Molar mass of K = 39 g/mol

Concentration of K = 1.30 mg/kg = $1.3\times 10^{-3}g/kg$

Conversion used : 1 g = 1000 mg

$\text{Concentration in molality}=\frac{1.3\times 10^{-3}g/kg}{39g/mol}$

$\text{Concentration in molality}=7.1\times 10^{-7}mol/kg$

Thus, the concentration in molality of K is, $3.3\times 10^{-5}mol/kg$

5 0

2 years ago

How many elements are there in the first column of the periodic table?

taurus [48]

Answer:

2 are number of coloum o

8 0

2 years ago

How many moles of chlorine gas is contained in 4.81x10^24 molecules

ziro4ka [17]

Answer:

7.99 mol

Explanation:

Step 1: Given data

Molecules of chlorine gas: 4.81 × 10²⁴ molecules

Step 2: Calculate how many moles of chlorine gas corresponds to 4.81 × 10²⁴ molecules of chlorine gas

In order to convert molecules to moles, we will use Avogadro's number: there are 6.02 × 10²³ molecules of chlorine gas in 1 mole of molecules of chlorine gas.

4.81 × 10²⁴ molecules × (1 mol/6.02 × 10²³ molecules) = 7.99 mol

6 0

2 years ago

What is the mass of oxygen in 10.0 grams of water

Inessa05 [86]

Answer:

16.00 amu

Explanation:

7 0

2 years ago

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