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3 years ago

5

Which statement is true? Energy cannot be created or destroyed. Energy can be destroyed but not created. Energy can be created b

ut not destroyed.

2 answers:

vaieri [72.5K]3 years ago

6 0

Energy can not be created and cannot be destroyed
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Kryger [21]3 years ago

5 0

Energy is neither created or destroyed, so your answer would be A. Energy is not created or destroyed. Hope this helps

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The use of microorganism in our day to day life is.................

Ipatiy [6.2K]

Explanation:

The use of microorganism in our day to day life is making medicine.

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2 years ago

A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

8 0

3 years ago

_______ is force divided by area.

Digiron [165]

Answer:

Pressure

Explanation:

Basically when you are pressing something you are applying force over an area thus Pressure is force divided by area.

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2 years ago

Read 2 more answers

How many core electrons does argon have?

Artemon [7]

10 core electrons are in argon.

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3 years ago

How is carbon monoxide formed in a car engine?

alexdok [17]

Carbon monoxide is produced in an engine when incomplete combustion happened. In a combustion engine intake valve, it combines the fuel and air (nitrogen and oxygen) and when spark plug ignites it pushes the piston downwards. After that piston will push itself upward and pushes the air that was generated by the combination of those components in the exhaust valve. This is a repeated cycle which keeps the engine running. In a perfect combustion process the air being released are carbon dioxide, water and nitrogen. But when an incorrect ratio of the combination of fuel and air in the engine is processed, carbon monoxide is being generated.

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3 years ago