In an exothermic reaction, energy is transferred from

a. the reactants to the surroundings.

c. one reactant to another.

b. the surroundings to the reactants.

d. the container to the chemicals.

Which is one possible way the digestive system works together with other body system

Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot's kinetic energy is joules.

Select whether there is no work done by the system, work done by the system or work done by the surroundings for each system described below: A. H2O (l) ⟶ H2O (g) ΔH = 44.0 kJ/mol B. 2 NO (g) + O2 (g) ⟶ 2 NO2 (g) ΔH = - 114.1 kJ/mol C.

Which is the strongest reducing agent is

If 3.50 g of the unknown compound contained 0.117 mol of C and 0.233 mol of H, how many moles of oxygen, O, were in the sample? Express your answer to three significant figures and include the appropriate units.

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.