In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?

A.

chromatography

B.

distillation

C.

filtration

D.

condensation

Strontium-90 has a half-life of 29 years. In how many years will a 1 kg sample of strontium-90 decay and reduce to 0.25 kg of strontium-90? Answer 58 years 116 years 87 years 29 years

How do you name this compound: Ca (HSO3) 2

What is the symbol for aluminum thiosulfate?

Why are ethics important when considering experiments? O A. It is important that people are not harmed for the sake of science. O B. Scientists would not be able to get funding if their experiments were not ethical. O C.

What do the broken lines mean connected to the hydrogen atoms

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O In the reaction of 6 moles of CH4 with excess oxygen, how many moles of water could be produced? 6 C 12.01 Carbon 1 H 1.01 Hydrogen 8 O 16.00 Oxygen A. 4 B. 6 C. 8 D. 12

Most mutagens have what kind of an effect on an organism?

According to the hess's law, the enthalpy of solution is: δhsoln = δhsolute + δhsolvent + δhmix. considering dissolving a small drop of nonpolar pentane oil in water which term (s) in the equation will experience the largest enthalpy change.

Solve for x: ln x = 0.863. Report your answer to 3 significant figures.

What water activities might be easier to do in Lake Assal's salty water? What activities could be more difficult?