In any chemical reaction, the quantities that are preserved are

a. mass and the number of atoms

b. mass and moles

c. the number of moles and the volumes

d. the number of molecules and the volumes

the nuber of molecules an the volumes

In any chemical reaction, the quantities that are preserved are the number of molecules and the volumes.

So the correct answer should be D.

Hope this helps,

Davinia.

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3