How do you separate sand and zinc?

A sample of nitrogen gas, (N2), occupies 45.0 mL at 27.00∘C and 80.0 kPa. What will be the pressure if the gas is cooled to - 73.00∘C at constant volume?

Hydrofluoric acid, hf, has a ka of 6.8 * 10-4. what are [h3o+], [f-], and [oh-] in 0.710 m hf?

What are the four states of matter and explain them

A nugget of gold with a mass of 521 g is added to 50.0mL of water. The water level rises to a volume of 77.0mL. What is the density of the gold?

Which of the following is not a step in balancing redox reactions in acidic solution, using the half-reaction method? A) H2O and OH - are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance.

What does a coefficient represent in a chemical formula? How do you use the coefficient to calculate the number of atoms in each molecule?

Identify 3 physical changes that could occur with a sheet of paper

What makes an acid or base strong?

In a laboratory, Carlos places one plate with grape jelly and another plate with cooked brown rice inside an ant farm. The next day, he finds that both plates are filled with ants.

Which statement is true at STP? (The atomic mass of Zn is 65.39 u.)