What do you mean by mixture? give two examples?

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these