Which of the following is always true when a substance undergoes a physical change?

a. the composition changes.

b. a change in color occurs.

c. no new substance is formed.

d. its specific gravity remains the same.

What layer of earths atmosphere is the layer next to the earth

What is the final volume in milliliters when 0.918 L of a 44.0 % (m/v) solution is diluted to 21.8 % (m/v) ?

A tank contains 200 L of fluid in which 30 grams of salt are dissolved. Brine containing 1 g of salt per liter is then pumped into the tank at a rate of 4L/min; the well mixed solution is pumped out at the same rate.

A solution containing a mixture of lactic acid and lactate was found to have a pH of 3.51. Calculate the ratio of the lactate concentration to the lactic acid concentration in this solution.

Is Neon a metal, nonmetal, or a metalliod

A student has 2.99 g of Potassium Permaganate. How many mL of a. 532 M solution can the student make? How does one solve this?

Which statement is true according to the kinetic theory? 1. Moles of different gases with the same mas and temperature always have the same average density. 2.

A substance with a pH of 9 has A) no H30 + ions or OH - ions. B) more H30 + ions than OH - ions. C) more OH - ions than H30 + ions. D) the same number of H30 + ions as it does OH - ions.

Consider the following quantities used in thermodynamics: E, H, q, w, S, G. How many of them are state functions? a. 2 b. 0 c. 3 d. 1 e. 4

What are some good problem statements