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3 years ago

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What compotent of air is least nessasery for life on earth

1 answer:

taurus [48]3 years ago

5 0

Answer:

Oxygen is the component of air necessary for life on Earth. All living organisms require it for respiration.

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Wide shield-like mountains are formed from what type of lava?

Reptile [31]

The answer is either D or B. hope this helps.

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3 years ago

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How many kilojoules are needed to convert 77.5 grams of ice at -8.00°C to water at 95.0°C?

Over [174]

Q=mcθ
m= 0.0775 kg
c= 4184 J·kg−1·K−1.
θ= T(final) - T(initial), 95-(-8)

Q=33398.78 J so kJ divide 1000

= 33.39878 kJ

7 0

2 years ago

What happens when a substance undergoes a physical change? Some physical properties change, but the substance keeps its identity

elena55 [62]

Some physical properties change, but the substance keeps its identity.

When dealing with these kind of questions, understand that the keyword here is physical change. Thus, all options that says no physical properties change are WRONG. So this leaves us with only 2 answers left. However, this is a physical change, no chemical change. Thus, the substance will keep its identity and not change.

8 0

2 years ago

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You drink part of your bottle of water, leaving 160 g in the bottle. When you purchased the water, it had a temperature of 10oC.

Evgesh-ka [11]

The energy that the water in the bottle absorbed is obtained as 16800 J.

<h3>What is the specific heat capacity?</h3>

The specific heat capacity of the water refers to the energy that is required to raise the temperature of 1Kg of the water by 1 degree.

Now we have the following;

mass (m) = 160 g

temperature change dT = ( 35oC - 10oC)

specific heat capacity (c)= 4.2 J/(g * oC).

Now;

H = mcdT

H = 160 g * 4.2 J/(g * oC) * ( 35oC - 10oC)

H = 16800 J

Learn more about specific heat capacity:brainly.com/question/1747943

#SPJ1

7 0

1 year ago

Tetrahydrofuran (THF) is a common organic solvent with a boiling point of 339 K. Calculate the total energy (q) required to conv

poizon [28]

Explanation:

For the given reaction, the temperature of liquid will rise from 298 K to 339 K. Hence, heat energy required will be calculated as follows.

$Q_{1} = mC_{1} \Delta T_{1}$

Putting the given values into the above equation as follows.

$Q_{1} = mC_{1} \Delta T_{1}$

= $27.3 g \times 1.70 J/g K \times 41$

= 1902.81 J

Now, conversion of liquid to vapor at the boiling point (339 K) is calculated as follows.

$Q_{2}$ = energy required = $mL_{v}$

$L_{v}$ = latent heat of vaporization

Therefor, calculate the value of energy required as follows.

$Q_{2}$ = $mL_{v}$

= $27.3 \times 444$

= 12121.2 J

Therefore, rise in temperature of vapor from 339 K to 373 K is calculated as follows.

$Q_{3} = mC_{2} \Delta T_{2}$

Value of $C_{2}$ = 1.06 J/g, $\Delta T_{2}$ = (373 -339) K = 34 K

Hence, putting the given values into the above formula as follows.

$Q_{3} = mC_{2} \Delta T_{2}$

= $27.3 g \times 1.06 J/g \times 34 K$

= 983.892 J

Therefore, net heat required will be calculated as follows.

Q = $Q_{1} + Q_{2} + Q_{3}$

= 1902.81 J + 12121.2 J + 983.892 J

= 15007.902 J

Thus, we can conclude that total energy (q) required to convert 27.3 g of THF at 298 K to a vapor at 373 K is 15007.902 J.

5 0

2 years ago