How many moles of hydrogen are in 50.0 l of hydrogen gas at stp? 1.39 moles 2.23 moles 0.985 moles 2.74 moles 4.56 moles?

What mass (in mg) does 2.63moles of nickel have?

An electrically neutral atom of oxygen has eight electrons. What other facts do you know for sure about this atom? 1.) there are eight neutrons in the nucleus 2.) there are eight protons 3.) there is a charge of + 8 on an atom of beryllium 4.

Which element is most likely to bend without breaking? carbon (C) iodine (I) silicon (Si) cobalt (Co)

An organism that contains two of the same alleles for a trait is said to be

What accurately pairs an atom to its charge

A tube that carries air from the larynx to the lungs is called

How many electrons should be shown in the lewis symbol for hydrogen?

A 0.070 M solution of the salt NaB has a pH of 9.60. Calculate the pH of a 0.010 M solution of HB. Or, what is the Kb of HB?

Classify each of the following as an element, a compound, or a mixture: (a) iron (b) oxygen (c) mercury oxide (d) pancake syrup (e) carbon dioxide (f) a substance composed of molecules each of which contains one hydrogen atom and one chlorine atom

If an unknown mineral has a hardness between 5 and 9, what could you do to the mineral to find out more about its hardness?