False. That is a compound.
The climate near the equator is hot and dry, think of the Sahara desert. The climate near the north and south poles is very cold for almost the whole year.
One of the reasons for this is that as the earth orbits the sun the sun's rays are most intense for regions near the equator. Depending on the time of year, the sun's rays can be very weak near the poles, and if you are close enough to the poles there are days in deep winter when the sun does not even rise over the horizon!
If you put a straw into a glass of water, the straw looks to be bent,
although nothing has physically happened to the straw. The term that
describes this
property of light is called refraction.
So, the answer would be: Refraction
Answer: 61%
The reaction equation should be
CaF2 + H2SO4 → 2HF + CaSO4
For every 1 molecule CaF2 used, there will be 2 molecules of HF formed. The molecular mass of CaF2 is 78/mol while the molecular mass of HF is 20g/mol. If the yield is 100%, the amount of HF formed by 112g CaF2 would be: 112g/(78g/mol) * 2 * (20g/mol)=57.43g
The percentage yield of the reaction would be: 35g/57.43g= 60.94%