If you start with 5 molecules of O2 in the reaction 2Mg+O2--> 2MgO, how much Mg will you need?

a.

4

c.

8

b.

5

d.

10

Celine has a bottle that contains 20% of milk and the rest water. The bottle has 1 liter of water. Write an equation in one variable that can be used to find the total number of liters of milk and water in the bottle.

Which describes a chemical reaction? A. Raw eggs are fried in a pan B. Raw eggs are scrambled with a fork C. Raw eggs are placed in a refrigerator D. Raw eggs are collected from a chicken coop

Give three examples of liquid substances in which you would expect dipole-dipole attractions to be large.

Suppose the mass spectrum of a hypothetical monatomic element X contains a signal at mass number 13 and another of identical height at mass number 15. A. Sketch the mass spectrum. Make sure each axis is properly labeled. B.

Many pain relief pills have powder that is enclosed inside a capsule. Why might this type of medicine work faster than a tablet if they both have the same amount and type of medicine?

Dalton's atomic theory

Describe how food is digested and absorbed

If a solution A has twice as much solute as solution B. Is it possible for the solutions to have the same concentration?

Chris is studying oxidation and reduction reactions. Which of the following could she use as an example of an oxidation reaction?

In a short circuit as the resistance decreases what happens to the current?