Which of the following is true about a combustion reaction?

a. It is an endothermic reaction.

C. CO2 and H20 are produced.

b. Oxygen must be a reactant.

d. All of the above.

What are the 3 rocks in the rock cycle?

Would you choose to have your genome sequenced to screen for diseases

A race car starts from rest on a circular track. The car increases its speed at a constant rate at as it goes 4.25 times around the track.

In a chemical reaction, activation energy increases the amount of chemical energynumber of particlestemperature of the reactants. This outcome causes the particles to collide, which results in the breaking upformationreaction of new products.

A 0.157kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.850m/s. It has a head-on collision with a 0.306kg glider that is moving to the left with a speed of 2.26m/s. Suppose the collision is elastic.

Why is there controversy to the opinion that human contribution of carbon dioxide to the atmosphere is cause warming

If the resistance of a circuit increases, that means that the current has to

One watt is equal to which of these values? 1 joule/hour 1 joule-hour 1 joule/second 1 joule-second

What are some of the benefits of learned optimism that have been found in research? O A. Fewer health problems O O B. All of these C. Making more money O D. A lower divorce rate

Katie runs 6 km in 0.6 hour, then 5 km in 0.5 hour. Katie's average speed is __ per hour.