What mass of helium is in a 2.00L ballon at STP

Greg classified some substances as shown in the table. Greg's Table Soluble in Water Insoluble in Water Dishwashing detergent Cloth Drink mix Plastic Sand Copper Why is Greg's table incorrect? Plastic is soluble in water. Copper is soluble in water.

50 mL of 2M H2SO4 react with 75 mL of 2M NaOH. Identify the limiting and excess reactants

Two elements that have similar properties to copper

Which electrolyte is stronger, NaOH or Ca (OH) 2? Why?

Which of the following substances are not homogeneous mixtures? A. Gold Ring B. Spaghetti Sauce C. Cane Sugar D. Window Glass E. River Water F. Bottled Water

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

A 5.00L reaction vessel is filled with 1.00mol of H2, 1.00mol of I2, and 2.50mol of HI. If equilibrium constant for the reaction is 129 at 500k, what are the equilibrium concentrations of all species?