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3 years ago

Choose all the right answers.

Chemistry

2 answers:

USPshnik [31]3 years ago

4 0

Answer:

They run out of fuel

Some heat radiates out

High pressure gases move the piston

LuckyWell [14K]3 years ago

3 0

They run out of fuel
Some heat radiates out
High pressure gases move the piston

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A man heats a balloon in the oven. If the balloon initially has a volume of 0.4 liters and a temperature of 20 degrees celsius,

Airida [17]

Answer:

0.714 liter.

Explanation:

Given:

The balloon initially has a volume of 0.4 liters and a temperature of 20 degrees Celsius.

It is heated to a temperature of 250 degrees Celsius.

Question asked:

What will be the volume of the balloon after he heats it to a temperature of 250 degrees Celsius ?

Solution:

By using:

$PV=nRT$

Assuming pressure as constant,

V∝ T

Now, let K is the constant.

V = KT

Let initial volume of balloon , $V_{1}$ = 0.4 liter

1000 liter = 1 meter cube

1 liter = $\frac{1}{1000} m^{3} = 10^{-3} m^{3$

0.4 liter = $0.4\times10^{-3}=4\times10^{-4} m^{3}$

And initial temperature of balloon, $T_{1}$ = 20°C = (273 + 20)K

= 293 K

Let the final volume of balloon is $V_{2}$

And a given, final temperature of balloon, $T_{2}$ is 250°C = (273 + 250)K

= 523 K

Now, $V_{1}$ = $KT_{1}$

$4\times10^{-4}=K\times293\ (equation\ 1 )$

$V_{2}$ = $KT_{2}$

$=K\times523\ (equation 2)$

Dividing equation 1 and 2,

$\frac{4\times10^{-4}}{V_{2} } =\frac{K\times293}{K\times523}$

K cancelled by K.

By cross multiplication:

$293V_{2} =4\times10^{-4} \times523\\V_{2} =\frac{ 4\times10^{-4} \times523\\}{293} \\ = \frac{2092\times10^{-4}}{293} \\ =7.14\times10^{-4}m^{3}$

Now convert it into liter with the help of calculation done above.

$7.14\times10^{-4} \times1000\\7.14\times10^{-4} \times10^{3} \\0.714\ liter$

Therefore, the volume of the balloon be after he heats it to a temperature of 250 degrees Celsius is 0.714 liter.

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The hardest known mineral is _____. topaz talc diamond graphite

klemol [59]

Diamond. It can only be cut with another diamond.

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4 years ago

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Create a chart that compares physical and chemical properties. Give two examples for each type of property

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Answer:

Chemical properties:

Those properties which change the chemical nature of matter.

Example:

Heat of combustion
Enthalpy of formation

Physical properties:

Those properties which do not change the chemical nature of matter.

Example

Differences between chemical and physical properties:

Chemical properties Physical properties

1. Observed after the change bringing 1. Observed with out being

the change change

2. These changes the molecules 2. only change physical state

3. Chemical identity changes 3.Chemical identity not changes

4. Structure of material changes 4.Structure of material not change

5. Chemical reaction is needed 5. No need of Chemical reaction

6. depend on composition 6. Does not depend on composition

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3 years ago

How many significant figures are present in 2.020 x 10-25

garik1379 [7]

Answer:4 and 3

Explanation:just took the test

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imagine that you're able to fully dissolve a powered substance and water what can be said about this creation

Softa [21]

We can say that the water is the solvent, and the powder is the solute. This is also a solution altogether.

Explanation:- A solute is the thing being dissolved into the solvent. While the solvent is what when the solute is being dissolved in. Together, they make a solution.

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3 years ago