What is the correct way to balance this equation? H2 + O2→H2O

H2 + 2O2→H2O

H2 + O→H2O

2H2 + O2→2H2O

2H2 + O2→H2O

To qualify for the finals in a racing event, a race car must achieve an average speed of 250 km/h on a track with a total length of 1 600 m.

An object is placed exactly halfway between the Earth and moon. The object will fall toward the

How is a problem different from an exercise?

Which of the following is NOT a type of galaxy? a. spiralc. elliptical b. ovald. irregular

The figure shows two vectors, u and v. Which law of vector addition should be used to find the resultant of these two vectors? A) Triangle law of vector addition, expressed symbolically as w u +v.

A certain gas is present in a 15.0 l cylinder at 2.0 atm pressure. if the pressure is increased to 4.0 atm the volume of the gas decreases to 7.5 l.

Choose all the answers that apply. To qualify as a planet, a celestial object must: have an irregular shape revolve around the sun orbit in a clear area have enough gravity to have a spherical shape have a satellite

Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most abundant element in living cells?

Acceleration is defined as the rate of change for which of the following? A. time B. velocity C. position D. displacement

What are 3 characteristics of a tornado?