Question

#solve these
# I will mark it brainliest

Answer 1

iii) a) refraction

b) stars twinkle because of refraction, they appear to change their position every minute, and since it is a great distance we can see it just twinkling.

iv) a) atteaction between two bodies us shown

b) if mass of m1 is doubled then the force if attraction in m2 by m1 will increase.

c) the fire of attraction will decrease

v) a) 2HCl + Zn ----------- ZnCl2 + H2

b)hydrogen gas

c) hydrogen gas extinguishes a burning splinter with a pop sound

d) Mg , Al , Zn, Fe

vi) a)addition reaction

b) it acts as a catalyst and accelerated accelerated reaction.