Which one of the following substances can be separated into several different elements?

A: Air

B: Iron

C: hydrogen

D: nickel

What is newton's third law second law first law?

Explain why astronomers have deduced that galaxies contain a large quantity of dark matter

Referring to the map of the temperature field in the room, what was the largest variation in temperature?

When you hold a small amount of sodium chloride in a flame, you observe that the flame is bright yellow. What can you do to be sure that the color is due to sodium and not chlorine?

The earth's worst mass extinction was: Late Devonian Ordovician-Silurian Permian-Triassic End Triassic Cretaceous-Tertiary

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?

Given the two sets, which statement is true? A = {1, 2} B = {1, 2, 3, 4}