The correct answer is option A and B
About 300 B.C., Aristarchus suggested that the sun was at the center of the universe because a) the brightness of the planets would change and b) the planets appeared to move among the constellations.
18 centuries before Copernicus, Aristarchus predicted that all planets orbit the sun. In other words, he suggested the Solar System is heliocentric.
Answer: The mass in grams is 514.8.
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 
of particles.
To calculate the number of moles, we use the equation:
given molecules = 
Putting in the values we get:
mass of 
The mass in grams is 514.8.
Hiii it’s mutualism hope this helped :)
Answer:
Hydrogen (H₂) gas at the cathode and Bromine (Br₂) gas at the anode
Explanation:
Bromine gas is evolved at anode.Since bromide ion is negatively charged it will go to anode to be oxidized and lose electrons.
while, Hydrogen gas is evolved at cathode .Since hydrogen ion is positively charged it will go to cathode reduced and gain electrons.
Answer:
F-Cl , O-H , N-S
Explanation:
Polarity of a bond is determined by the Electronegativity across the period and its group.
So un the basis of that.
A .Br - Cl < F-Cl
B .O-H > Se-H
C .As-H < N-S
