The first element on the periodic table of elements is carbon.

A. True

B. False

For a rainbow to form, sunlight needs to enter and then re-emerge from raindrops. What happens to the light between when it first enters a raindrop and when it comes out of the raindrop

What is the range of the numbers of isotopes chemical elements have?

Suppose that a solution is tested for NO2 ion by adding 3M H2SO4 and heating, repeating this process until no further reaction occurs.

What is a benefit of fuel cell cars over standard cars? Fuel consumption is reduced by 30-90 percent. O Hydrogen-powered cell vehicles are cheaper. Hydrogen fuel is very safe and economical to store.

A scientist would most likely need to update her model when it

What is one element in the same family as oxygen?

Why does a ball rolling along a level sidewalk slow down and then stop

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas