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agasfer [191]
3 years ago
6

Please do 20 and 21 I will give you extra points!!!

Chemistry
1 answer:
Vaselesa [24]3 years ago
6 0

Answer: #20

Explanation:

if the sun got dimmer then plants would that need a high tempature would not be able to grow it would also be very cold

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A sample of gas occupies 115.9 mL at -206.6°C. What volume does the sample occupy at 175.9 °C?
aniked [119]
Charles law gives the relationship between volume of gas and temperature.
It states that for a fixed amount of gas at constant pressure, volume of gas is directly proportional to the temperature.
\frac{V}{T} = k

where V - volume and T - temperature and k - constant 
\frac{V1}{T1} =  \frac{V2}{T2}
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in Kelvin , -206.6 °C + 273.15 = 66.55 K
T2 - 175.9 °C + 273.15 = 449.05 K
substituting the values in the equation 
\frac{115.9 mL}{66.55 K} =  \frac{V}{449.05 K}
V = 782 mL
the new volume is 782 mL
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3 years ago
Quiz <br> Explain why<br> Ice melts by heating
labwork [276]
By providing the heat to the ice th closely packed particles of it gain kinetic energy and move away from each other so it melts
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3 years ago
The atomic notation for a particular atom of boron is 11/5 B. The atomic number is while the mass number is_, while the mass num
Morgarella [4.7K]

The atomic number=5

The mass number=11

<h3>Further explanation</h3>

In the following element notation,

\tt \large {{{A} \atop {Z}} \right X}

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A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

So for The atomic notation for a particular atom of Boron  :

₅B¹¹

Z=5=atomic number

A=11=mass number

5 0
3 years ago
Atoms that differ only in the number of neutrons are called:
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The answer is C. Isotopes.

Isotopes are defined as two substances that have the same number of protons and electrons, but a different number of neutrons, and therefore a different atomic mass. For example, carbon-12 and carbon-14 are isotopes of each other.

Hope this helps!
8 0
3 years ago
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How many grams of RbOH are present in 35.0 mL of a 5.50 M RbOH solution?​
Ganezh [65]
I think 5.50 M x 35.0 mL x molar mass of RbOH = mass (g)
8 0
4 years ago
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