The mass of earth is 5.974x10^24 kg. assume that earth is a sphere of diameter 1.28x10^4 km and calculate the average density of earth in grams per cubic centimeter.

The average density of Earth is 5.44 g/cm³.

Mass

Mass = 5.974 × 10²⁴ kg = 5.974 × 10²⁷ g

Volume

d = 2r = 1.28 × 10⁴ km

r = 6.40 × 10³ km × (10³m/1 km) × (10² cm/1 m) = 6.40 × 10⁸ cm

V = ⁴/₃πr³ = ⁴/₃π × (6.40 × 10⁸ cm)³ = 1.098 × 10²⁷ cm³

Density

Density = mass/volume = (5.974 × 10²⁷ g)/(1.098 × 10²⁷ cm³) = 5.44 g/cm³

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

your parents i think this could be it