4. Write a chemical formula for a compound that has two atoms of oxygen (0) and

three atoms of iron (Fe).

A ball on the surface of a pool bobs up and down due to the waves formed in the pool. The water waves have a wavelength of 1.2 meters, and they pass the ball with a frequency of 3 hertz. What is the speed of the waves?

Thea dissolves 0.33 mole of glucose into 450 mL of water. What is the concentration of the solution?

How does the ozone layer over the Arctic change with the seasons?

Water becomes a gas. what step is this?

Sam is heating water on the stove for his science experiment. How will he know when it is boiling? A. It will be warm. B. There will be bubbles forming in the water. C. The water will turn bluish. D. The temperature will rise to 80 degrees Celsius.

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?

The temperature of 15 grams of water increases by 3.0 degress. how much heat was absorbed by water?

What are the four types of stoichiometry problems?

100 ml oxygen at 1.75 atm and 200ml nitrogen at 0.6 atm are passed to a 500 ml vessel. Calculate the total pressure of the mixture in the vessel at same temperature