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Natasha_Volkova [10]
3 years ago
7

Which of the following statements about subatomic particles best characterizes electrons? A positive charge, light, circling the

nucleusB no charge, heavy, found in nucleusC negative charge, light, circling the nucleus D negative charge, heavy, circling the nucleus
Chemistry
2 answers:
schepotkina [342]3 years ago
7 0
Every electron carries one elementary negative charge.  Concerning mass,
it takes roughly 1,840 electrons to make enough mass for 1 proton or 1 neutron.
Electrons don't necessarily have to stay connected to an atom, but when they do,
they circle the nucleus.

So you should select (C): ==> Negative, ==> light, ==> circling the nucleus.
Sergio039 [100]3 years ago
6 0
The answer should be (C) negative charge,  light and circling the nucleus.

Why? ---- An electron always has negative charge. Its mass is 1/ 1900 times the mass of proton and it circles the nucleus.
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If 4.00 moles of gasoline are burned according to the chemical
denis23 [38]

Answer: The volume of oxygen at STP is needed for complete given combustion is 1121.28 L.

Explanation:

The given reaction equation is as follows.

2C_{2}H_{18}(l) + 25O_{2}(g) \rightarrow 16CO_{2}(g) + 18H_{2}O(g)

This shows that 2 moles of gasoline requires 25 moles of . Hence, moles of oxygen required to react with 4 moles of gasoline are calculated as follows.

\frac{25 mol O_{2}}{2 mol C_{2}H_{18}} \times 4 mol C_{2}H_{18}\\= 50 mol O_{2}

At STP, the pressure is 1 atm and temperature is 273.15 K. Therefore, using ideal gas equation the volume of oxygen is calculated.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

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T = temperature

Substitute the values into above formula as follows.

PV = nRT\\1 atm \times V = 50 mol \times 0.0821 L atm/mol K \times 273.15 K\\V = 1121.28 L

Thus, we can conclude that volume of oxygen at STP is needed for complete given combustion is 1121.28 L.

6 0
3 years ago
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lys-0071 [83]

Answer:

Solution given:

c) Magnesium metal plus silver acetate (teachers note:

<u>Balanced</u><u> </u><u>chemical</u><u> </u><u>equation</u><u>:</u>

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\boxed{\bold{\green{2HBr+Zn \rightarrow Be_{2}+H_{2}}}}

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