The combustion of hydrogen gas in oxygen, is it an endothermic or exothermic process? Write a chemical reaction for this process

How much heat is needed to raise the temperature of 8g of water by 16oC?

Which has more thermal energy, 500g of ice or 500g of steam? explain your answer.

Classify the following substances as diamagnetic or paramagnetic based on its magnetic properties. A substance that has paired electrons A substance that has unpaired electrons A substance that has no net magnetic moment A substance that is

Which of the following substances can have variable composition? a) diamonds b) graphite c) air d) water

A metal has a mass of 8.7 grams and a volume of 3.2mL is it metal gold?

How many grams of silver chloride (AgCl) can be produced if you start with 12.5 grams of barium chloride (BaCl2) ? 2AgNO3 + BaCl2 = = > 2AgCl + Ba (NO3) 2

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese (IV) oxide. 4 HCl (aq) + MnO 2 (s) ⟶ MnCl 2 (aq) + 2 H 2 O (l) + Cl 2 (g) 4HCl (aq) + MnO2 (s) ⟶MnCl2 (aq) + 2H2O (l) + Cl2 (g) A sample of 43.

Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.

Which of the following words correctly describes CO2? Select all that apply A. Its a substance b its a compound c its a element D its a mixture

A certain reaction has an activation energy of 51.64 kj/mol. At what temperature Kelvin will the reaction be 5.50 times faster than it did at 343K?