Please help asap I will give brainiest

12 = Lead

13 = red

Explanation:

12:

Given data:

Mass of metal = 143 g

Volume of metal = 12.6 cm³

Identity of metal = ?

Solution:

To check which metal is this we will calculate the density.

Formula:

d =  m/v

d = 143 g/ 12.6 cm³

d = 11.3 g/cm³

The metal is lead.

13:

First of all we will calculate the densities of all liquid. The liquid with the highest density will form the bottom layer.

Blue:

d = m/v

d = 12 g/100 mL

d = 0.12 g/mL

Clear:

d = 10 g/ 100 mL

d = 0.1 g/mL

Red:

d = m/v

d = 15 g/100 mL

d = 0.15 g/mL

Yellow:

d = m/v

d = 13 g/ 100 mL

d = 0.13 g/mL

The density of red liquid is highest from all thus it will form bottom layer.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

"the periodic table is arranged in order of atomic number."