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3 years ago

1.What does the Law of Conservation of Energy tells us?

1 answer:

4 0

1. Energy can neither be created or destroyed.
2. Conduction. Putting a pot of water on a hot burner. Convection. Putting your wet shoes over an air vent to dry them quicker. Radiation. Sitting in front of the fire to warm your hands up.
3. renewable sources can be used again and again, but non renewable sources cannot.
4. I would recommend solar energy. I think solar energy should be considered because solar energy can be reused, and also because they can use it to power their houses and they wouldn't need fossil fuels to do so.
5. Turn off the lights and open the windows during the day and if something is left plugged into the wall and it is not being used, unplug it.

hope I could help!

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In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What m

salantis [7]

Answer : The mass of copper deposit is, 1.98 grams

Explanation :

First we have to calculate the charge.

Formula used : $Q=I\times t$

where,

Q = charge = ?

I = current = 10 A

t = time = 10 min = 600 sec (1 min = 60 sec)

Now put all the given values in this formula, we get

$Q=10A\times 600s=6000C$

Now we have to calculate the number of atoms deposited.

As, 1 atom require charge to deposited = $2\times (1.6\times 10^{-19})$

Number of atoms deposited = $\frac{(6000)}{2\times(1.6\times 10^{-19})}=1.875\times 10^{22}$ atoms

Now we have to calculate the number of moles deposited.

Number of moles deposited = $\frac{(1.875\times 10^{22})}{(6.022\times 10^{23})}=0.03113$ moles

Now we have to calculate the mass of copper deposited.

1 mole of Copper has mass = 63.5 g

Mass of Copper Deposited = $63.5\times 0.03113 =1.98g$

Therefore, the mass of copper deposit is, 1.98 grams

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3 years ago

What happens when a liquid becomes a gas?

anzhelika [568]

Answer:

A It changes shape and volume

Explanation:If a liquid turns into a gas it starts to change shape since they are not the same

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2 years ago

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Which answer below correctly identifies the type of change and the explanation for the boiling of water?

Trava [24]

Answer:

The second choice: physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved

(WAS ALREADY ANSWERED PREVIOUSLY)

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2 years ago

Photosynthesis produces

dmitriy555 [2]

Photosynthesis produces glucose and oxygen.... Respiration on the other hand would produce the other options.

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2 years ago

How does your body use perspiration to stay cool

tiny-mole [99]

Imagine each of those as a drop of sweat that will evaporate taking a bit of your body heat away. So sweat helps cool you down two ways. First, it makes your skin feel cooler when it's wet. And when it evaporates it removes some heat.

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2 years ago

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