How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?

Which of the following changes to a system WILL NOT result in an increase in the system's pressure? a. Decreasing the volume of the system b. Increasing the volume of the system c. Raising the temperature of the system d.

Classify the following compounds as ionic or covalent: a. MgCl2 b. Na2S c. H2O d. H2S

Which of the following elements has 2 electrons in the 4s sublevel?

Which of these is a mixture? Question 3 options: calcium carbon dioxide salt water potassium

Main ides what is weather

3. Which net ionic equation describes this reaction? 3Ca (OH) 2 (aq) + 2FeCl3 (aq) → 3CaCl2 (aq) + 2Fe (OH) 3 (s) 3Ca2 + (aq) + 3OH - (aq) + Fe3 + (aq) → Fe (OH) 3 (s) + CaCl2 (aq) Fe3 + (aq) + 3OH - (aq) + 3Ca2 + (aq) → Fe (OH) 3 (s) + 3Ca2 + (aq)

How many moles of methane are produced when 25.1 moles of carbon dioxide gas react with excess hydrogen gas?

Which reaction releases the greatest amount of energy per kilogram of reactants? A) neutron + uranium-235 ➡️ barium-141 + krypton-92 + 3 neutrons B) 2C + H2 ➡️ C2H2 C) C3H8 (g) + 5O2 (g) ➡️ 3CO2 (g) + 4H2O (l) D) NaOH (aq) + HCl (aq) ➡️ NaCl (aq) +

Name the hardest artificial substance known?

Suzzane has type A - blood. Which thpe of blood could she receive in a blood transfusion?