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Gemiola [76]
3 years ago
8

Can you please help me with these true and false questions thanks!

Chemistry
1 answer:
jek_recluse [69]3 years ago
6 0
1 true
2 false 
3 false
4 true
5false
6 false
7false
8true
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I answered a question for you earlier and confused it with this question.
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10. The density of aluminum is 2.7 g/cm². A 27g piece of aluminum will have<br> what volume?
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3 years ago
A cylindrical piece of metal is 4.5 dm in height with radius of 5.50 x 10^-5 km.
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Answer:

a) V=4.3x10^3mL

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Explanation:

Hello,

a) In this case, the given height in cm is:

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And the radius in cm is:

r=5.50x10^{-5}km*\frac{1000m}{1km}*\frac{100cm}{1m}=5.5cm

Thus, the volume in cubic centimeters which is also equal in mL (1cm³=mL) is:

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b) In this case, the given height in mm is:

h=4.5dm*\frac{1m}{10dm}* \frac{1000mm}{1m}=450mm

And the radius in mm is:

r=5.50x10^{-5}km*\frac{1000m}{1km}*\frac{1000mm}{1m}=55mm

Thus, the volume in cubic millimeters is:

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c) Finally, since 1000 mL equal 1 L, the required density in g/L turns out:

\rho=\frac{m}{V}=\frac{6.54x10^5g}{4.3x10^3mL}*\frac{1000mL}{1L}\\   \\\rho=1.5x10^5g/L

Best regards.

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3 years ago
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mart [117]
1. An atom has an equel number of protons and electrons. Since protons are positive and electrons are negative, they are balanced out and there is no charge.
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