The student compared the conductivity of sodium chloride solution with the conductivity of potassium chloride solution. State one variable the student should keep constant when measuring the conductivity of the two solutions.

Find the mass in grams of 1.37x1020 particles of h3po4

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.