Which one is not required for reaction of nitrogen with hydrogen to form ammonia gas?

1. uv light 2. high pressure

3. high temperature 4. iron catalyst

Which of the following is the most important factor when determining a safe speed? A) Number of passengers on your boat B) Distance from the nearest safe shoreline C) Presence of a safe water buoy D) Wind, water conditions and currents

Diffraction is when light is bent around obstructions. Which of the these observation about clouds would indicate diffraction? A) After rain storms, you can sometimes see rainbows. B) Clouds are white or gray and cannot be seen through.

A slice of Swiss cheese contains 48 mg of sodium What is this mass in grams What is this mass in ounces? (16 oz = 453.6 g) What is this mass in pounds? (1 lb = 453.6 g)

What is The substance that could not be dissolved and has settled out of a solution

What is a substance that contains only a single type of atom

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.