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Oksanka [162]
3 years ago
13

What is question 16 and 17

Chemistry
1 answer:
Vinvika [58]3 years ago
7 0
For question 16, the answer is B.. the atomic number is 17 and the mass is 35, when you subtract 17 from 35 you get 18 which is the number of neutrons.
for question 17, the atomic mass is protons+neutrons (in this case 8+6=14) the correct answer is C

I hope that helped
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Elaborate on how to classify elements and pure compounds.
tankabanditka [31]

Answer: C) Elements and pure compounds are homogeneous materials because they have a uniform composition throughout.

Explanation: Element is a pure substance which is composed of atoms of similar elements. Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Elements are compounds form homogeneous materials as they have uniform composition throughout and the components are evenly distributed throughout the material.

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material.

4 0
3 years ago
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How can a montain range cause a large dessert?
Simora [160]

Explanation:

An extensive mountain range can cause a large desert area.

Mountains are usually geologic features that have heights that are greater than 600m.

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3 0
4 years ago
uranium hexafluoride is a solid at room temperature, but it boils at \(56^o C\).determine the density of uranium hexafluoride at
PSYCHO15rus [73]
<span>If it is known that at 60 °C and 745 torr UF₆ is present only as a gas then we can make the assumption that:

</span>(n/V) = P/RT = (745 torr)/(62.36 L-torr/mol•K)(337 K) = 0.0354 mol/L 
Therefore the density will be:
<span>
Density = (352.02 g/mol)(0.0354 mol/L)/(1000 cm³/L) = 0.0125 g/cm³
</span>
6 0
3 years ago
If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at , what is the total pressure of the syst
Naddika [18.5K]
The pressures given are the partical pressures of the two gases.

The law of Dalton or of the partial pressures states that the total pressure of a mixture of gases is equal to the sum of the pressures of all the gases.

So, in this case:

Total pressure = pressure of nitrogen + pressure of carbon dioxyde.

Of course both terms must be in the same units.

i have found that the pressures for this problem are:

Pressure of nitrogen = 984 torr

Pressure of carbon dioxyde = 345 torr

Total pressure = 984 torr + 345 torr = 1329 torr.

Now convert to atm: 1 atm = 760 torr

=> 1329 torr * 1 atm / 760 torr = 1.74868 atm ≈ 1.75 atm

Answer: 1.75 atm

4 0
4 years ago
How many moles are in 45g c6h5no2
Andrews [41]

Answer:

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5 0
3 years ago
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