Is putting salt into water a chemical or physical change

Which of the following is a way your body fights a bacterial infection? Fever Shivers Sweats Increased heart rate

What was Johann Dobereiner's contribution to the development of the periodic table? A. He arranged the elements according to increasing mass B. He arranged the elements according to increasing atomic number C.

When you finish using the compound brightfield microscope, what should you have your lab instructor do?

Which of the following isa harmful waste material that leaves the blood and travels through the lungs before leaving the body?

Conduction can occur in solids, liquids, or gases, but it is more effective in

Consider the following representation of a reaction mechanism. Step 1: Unimolecular (fast) Step 2: Bimolecular (slow) Step 3: Unimolecular (fast) Which conclusion about the rate law for the reaction above is reasonable? A.

1. Which of the following best describes an example of pure chemistry? a) testing the effects of lower concentrations of a drug on humans b) studying chemicals containing carbon c) developing a cure for osteoporosis d) finding an antidote for a new

Problem 1: For which of the following activities might you want to hire a chemist? A. building a garage B. testing a sample of water from a well C. finding a comet D.

Why do most living things need food water and the ability to get rid of waste?

What is the effect of adding more water to the following equilibrium reaction? CO2 + H2O - > 2H2CO3