Calculate the percentage by mass of lead in pbco3.

a. 17.96

b. 22.46

c. 73.05

d. 77.54

e. 89.22

Why is the earth often referred to as the blue planet

When burning petrol in motor vehicles two gases form which contribute to acid rain. what are the two gases?

An atom that is identified by the number of protons and neutrons in its nucleus; A general term for a specific isotope of an element, is called?

18.95cm equal how many hectometers

What formula do you. use to find the number of neutrons

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait

If T = dominant, and t = recessive, what would the genotypes be?