Identify the period or group number described for the following case:

a) contains elements C, N and O

b) start with helium

c) Contains the alkali metals

d) end with neon

Rank the following 0.100 M solutions in order of increasing H3O + concentration: HF, Ka = 6.3 * 10-4; HCN, Ka = 6.2 * 10-10; HOCl, Ka = 4.0 * 10-8 HF < HCN < HOCl HCN < HOCl < HF HOCl < HCN < HF HF < HOCl < HCN HOCl < HF < HCN

If a large marshmallow has a volume of 3.25 in3 and density of 0.242 g/cm3, how much would it weigh in grams? 1 in3=16.39 cm3

When the number 2.35 is rounded to contain 2 significant figures it becomes 2.4?

A great white shark has resided at a depth where the pressure is 16 atm. If the initial volume of its swim bladder is 4 L, what would the new volume be if it surfaces where the pressure is 2 atm

Seedless nonvascular plants include

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?