Fill in the coefficient needed to make the equation balanced. 1. Na + Cl2 → NaCl

a. 2, 2
b. 2, 3
c. 2, 1
d. 2, 4

2. Al + S → Al2S3

a. 2, 2
b. 2, 3
c. 2, 4
d. 2, 6

3. H2 + O2 → H2O

A. 2, 2
b. 2, 3
c. 2, 4
d. 2, 8

4. Fe + O2 → Fe2O3

a. 4, 2, 2
b. 4, 2, 1
c. 4, 3, 2
d. 4, 3, 1

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61