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tester [92]
3 years ago
15

Select the correct answer.

Chemistry
1 answer:
VLD [36.1K]3 years ago
7 0

Answer:

I think it’s c.

Explanation:

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What simple machine would be best for lifting a couch through a 3rd floor apartment window?
egoroff_w [7]

Answer:

Pully

Explanation:

I would think that a pully would be most effective for lifting it Up and into the apartment (at least if you have a suitable spot to put the pully)

7 0
3 years ago
Select the correct answer. In which situation is chemical energy being converted to another form of energy? A. a lamp plugged in
garri49 [273]

Answer:

D. A burning candle. (chemical energy into energy of heat and light, i.e. thermal and wave)

Explanation:

comment and tell me if it right.

5 0
3 years ago
A sample of neon occupies a volume of 478 mL at STP. What will be the volume of the neon when the pressure is reduced to 93.3 kP
Andre45 [30]

The volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Explanation:

The kinetic theory of gases is mostly based on Boyle's law. From the Boyle's law, the pressure experienced by any gas molecules is inversely proportional to volume of the gas molecules. Also this inverse relation is obeyed if and only if the number of moles and temperature of the gas molecules remained constant.

So,P=\frac{1}{V}

So if there is a change in pressure then there will be inverse change in volume. That means if there is decrease in the pressure of gas molecules then there will be increase in the volume and vice versa.

So the Boyle's law is combined as P_{1} V_{1} = P_{2} V_{2}

As here the initial pressure or P_{1} is 1 atm or 101.3 kPa and the initial volume is 478 mL. Similarly, the final pressure is 93.3 kPa and the final volume will be

101.3*10^{3}*478*10^{-3}  = 93.3*10^{3} * V_{2}

V_{2} = 519 mL

So, the volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

5 0
4 years ago
CHo 50ml dung dịch H2SO4 2M tác dụng vừa đủ với dung dịch BaCl2
stira [4]

Answer:

cho

Explanation:

7 0
3 years ago
How many moles of ba(oh)2 are present in 275 ml of 0.200 m ba(oh)2?
DENIUS [597]
You have to put your attention to the unit of concentration. It is expressed in terms of molarity, which is represented in M. It is the number of moles solute per liter solution. So, you simply have to multiply the molarity with the volume in liters.

Volume = 275 mL * 1 L/1000 mL = 0.275 L
<em>Moles Ba(OH)₂ = (0.200 M)(0.275 L) = 0.055 mol</em>
6 0
4 years ago
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