Which of the following is true for combustion reactions?

Energy is absorbed.

Energy is released.

Hydrogen is a reactant.

Nitrogen is a reactant.

What is the speed of the silver sphere at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100% of the sphere's initial potential energy is converted to kinetic energy by the time impact occurs.)

What is vapor pressure and why does it change with temperature?

If we start with 8000 atoms of radium-226 how much would remain after 3200 years?

As the average kinetic energy of the particles in a gas increases, which of the following occurs? The temperature of the gas increases. The temperature of the gas decreases. The number of particles increases. The number of particles decreases.

On a hot day, the sun causes the sidewalk to become very warm. How do the particles that make up the sidewalk change as the temperature increases? A:They move closer together. B:They move freely from place to place. C:Their kinetic energy decreases.

Aldo drove 420 miles using 18 gallons of gas. at this rate, how many gallons of gas would he need to drive 357 miles

How many grams of As2S3 are in 3.25 moles?

How does a solid turn into a liquid

What does the Ka represent in the equation and why is it important?

Is an american alligator a autotroph?