Today, there are about how many people living on the earth?

3.4 billion

7.5 billion

9.0 billion

6.6 billion

a gas has a volume of 45.0 mL and a pressure of 760.0 mm. If the pressure increased to 850.0 mm and the temperature remained the same, what would be its new volume?

Why is gas collected over water not pure

What is the estimated age of a tree with 6 dark rings and 6 light rings? 12 years old 3 years old 4 years old 6 years old

Determine which ordered pairs fall on the graph of f (x) = - 2x-1 Show all of your work for each ordered pair. Ordered Pairs: (1,1) (-1, - 4) (-2, - 1/8) (0,1/2)

Which reaction is an example of an acid-base reaction? Which reaction is an example of an acid-base reaction?

An electronic circuit element consists of 23 mg of silicon. An electric current through the circuit adds heat at a rate of 7.4 x 10-3 J/s.

If an object sinks in water it's density is less than that of water true or false

What is the main link between water in the oceans and on land

Which of the following pairs lists a substance that can neutralize H2SO4 and the salt that would be produced from the reaction? CaOH2 and Ca (SO4) 2 LiOH and Li2SO4 NH4 and NH4SO4 NH3 and (NH3) 2SO4

What layer of earths atmosphere is the layer next to the earth