Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O?

a. 2

b. 3

c. 5

d. 6

A science class puts a balloon containing 1.25 l of air at 101 kpa into a bell jar. using an air pump, the class removes some of the air in the jar, causing the balloon to expand to a volume of 2.25 l.

Drivers a and b travel west from boston. driver a leaves three hours earlier traveling at a constant speed of 68mph. driver b follows at a constant speed of 85 mph. how many hours would it take for driver b to catch up to driver a?

A system expands by 0.91m3 at a constant pressure of 105 kPa. (a) Find the heat that flows into or out of thesystem if its internal energy increases by 91 J.

How is refraction different from reflection? A. Refraction occurs only within the same medium B. The light travels at the same speed as before it was C. The angle of refraction is measured from the flat surface rather than from the normal D.

What is discrete charge distribution and continuous charge distribution

Which safety measures should you follow during a thunderstorm? Check all that apply. (A) Avoid touching anything that conducts electricity. (B) Avoid touching a person who has been struck by lightning. (C) Go outside.

1. An automobile with a mass of 1000 kg accelerates when the traffic light turns green. If the net force on the car is 4000 N, what is the car's acceleration?

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball.

Under what conditions will an object experience a gravitational force? Under what conditions will an object experience an electric force? Under what conditions will an object experience a magnetic force?

A basketball player pushes down with a force of 34 N on a basketball that is inflated to a gauge pressure of 9 x 104 Pa. What is the diameter of contact between the ball! and the floor?