HEL PL;EAS 1. Which state of matter has a definite volume but no definite shape?
a- soild
b- liquid
c- gas
d- plasma

2. What causes phase changes?
a- it is a law of nature that cannot be explained
b- inertia
c- adding or removing heat energy
d- calculating the density

3. I have two samples of gold. One is 20 grams and the other is 40 grams. Which of the following is the same for both samples of gold?
Group of answer choices

a- mass
b- volume
c- density
d- length

Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d.the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge

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

How can a mixture of salt water be separated into salt and water