Answer:
A separation technique to separate solids from a solution. Crystallization can be defined as the process through which the atoms/molecules of a substance arrange themselves in a well-defined three-dimensional lattice and consequently, minimize the overall energy of the system.
Explanation:
Answer:
14 seconds
Explanation:
because you dropped it and it takes 14 seconds
Answer:
6.8 mm
Explanation:
We are given that
Mass of block,m=10 kg
Mass of bullet,
1 kg=1000 g
Total mass of system,M=
Speed of bullet,u=300 m/s

By law of conservation of momentum


According to law of conservation of energy
Change in kinetic energy of system=Change in potential energy of system


Where 

1m=100 cm

Distance traveled by block=
1cm=10 mm
decomposition
A decomposition reaction is just the opposite of combination reaction
Answer:
(a) Moon has smaller diameter and lower density than earth
Explanation:
Moon has smaller diameter than earth earth has a diameter of 12742 km whereas moon has a diameter of 3474.21 km
So for density density is given by 
From the relation we can see that density is dependent on mass and volume directly proportional to mass and inversely proportional to diameter
But in case of earth and moon mass is more dominating than volume so density is less for moon than earth