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iVinArrow [24]
3 years ago
10

Which of these elements has the highest first ionization energy?

Chemistry
1 answer:
julia-pushkina [17]3 years ago
6 0

Answer:

Cesium (Cs)

Explanation:

This eliment has an ionization energy of 3,8939

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What mass of oxygen is needed for the complete combustion of 4.60×10−3g of methane?
sp2606 [1]
First step in answering the question is to establish a balanced chemical reaction equation. More specifically, a combustion chemical equation. 

CH4 + 2O2 ---> CO2 + 2H20

Then using dimension analysis: 

4.60*10^{-3} g CH4 ( \frac{moleCH4}{16 g CH4}) * ( \frac{2mole O2}{mole CH4}) * ( \frac{32 g O2}{mole O2} ) =  0.0184 g O_{2}
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At what temperature (°C) will a 10.00 g sample of neon gas exert a pressure of 96.7 kPa in a
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Answer : The temperature of neon gas will be, 221.0 K

Explanation :

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Conversion used : (1 atm = 101.3 kPa)

V = volume of neon gas = 9.50 L

T = temperature of neon gas = ?

R = gas constant = 0.0821 L.atm/mole.K

w = mass of neon gas = 10.00 g

M = molar mass of neon gas = 20 g/mole

Now put all the given values in the ideal gas equation, we get:

(0.955atm)\times (9.50L)=\frac{10.00g}{20g/mole}\times (0.0821L.atm/mole.K)\times T

T=221.0K

Therefore, the temperature of neon gas will be, 221.0 K

7 0
3 years ago
7. A cyclist starting from rest accelerates at a rate of 6 m/s until she reaches 30 m/s. How long
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Answer:

Explanation:

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when the net force of an object decreases

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For the answer to the question above,
The re<span>action of solid iron with aqueous copper sulfate is an example of a single displacement type of reaction which exchanges only the cations of the element and the compound. In this case, the equation is 

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