Using the equation

2H2+O2-->2H2O

If 19 g of oxygen reacts completely, how many grams of hydrogen must react with it?

Question options:

4.8

3.6

1.2

2.4

Explain the difference between an endothermic and an exothermic reaction using the concepts of potential energy, stability, and a system. How do these types of reactions demonstrate the conservation of energy? (Energy of Reactions)

Rearrange D=m/v to make v the variable

13. A warm air mass that is cut off from the ground is said to be 14. A swirling center of low air pressure is called a (n) 15. are high-pressure centers of dry air.

how many milliliters of a 5.0M sulfuric acid solution would you need to prepare 100.0 mL of 0.25M sulfuric acid?

What are the conditions required for natural selection

A penny has a mass of 2.50g and the moon has a mass of 7.35 X 10^22 Use this information to answer the questions below. Be sure your answers have the correct number of significant digits.

If a car tire has a diameter of 3232 inches, what is the approximate circumference of the tire?

9) Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak.

Explain what happens to the average kinetic energy thermal energy and temperature of a substance when the particles in the substance slows down

Which of the following could be used to describe the rate of a reaction? change in time/change in concentration change in mass/change in concentration change in concentration/change in time change in concentration/change in mass