Answer:
The answer to your question is letter b) He and Ne
Explanation:
Elements that have similar properties are placed in the same group in the periodic table.
So
A C and F These elements do not have similar properties because C is in group 4A and F is in group 7A. This is not the right answer.
B He and Ne These elements have similar properties becase they are in the same group (8A).
C Al and Si These elements do not have similar properties because Al is in group 3A and Si is in group 4A. This is not the right answer.
D N and S These elements do not have similar properties because N is in group 5A and S is in group 6A. This is not the right answer.
Answer:
206 c
Explanation:
Use the Charles' Law because you have the volume and temperature given.
V1 / T1 = V2 / T2
Let's list the given:
V1 = 0.668 L
V2 = 0.942 L
T1 = 66.8 C (339.8K)
Convert all Celsius temps to Kelvin. Just add 273.
Asked: T2
Derive the formula for T2.
T2 = V2T1 / V1
= (0.942)(339.8) / 0.668
= 479K
Since the temp should be in C, just subtract 273 from 479K.
The answer is 206 C.
If my memory serves me well, the right one is B. There is equal number of each type of atom on the reactant and product side. Check it, if I'm wrong.
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