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

Define element and compound. explain the difference between an element and a compound.

Which one of the following equations is the net ionic equation for the reaction of aqueous sodium hydroxide (NaOH) with aqueous hydrochloric acid (HCl) ?

What is the molarity of Cl - in each solution? a. 0.210 M NaCl b. 0.160 M SrCl2 c. 0.110M AlCl3

Calculate the formula mass for the compound tin (IV) sulfate.

The noble gases are good together in the periodic table where the mobile gas is in table

Nitrogen dioxide (NO2) gas and liquid water (H2O) react to form aqueous nitric acid (HNO3) and nitrogen monoxide (NO) gas. Suppose you have 5.0 mol of NO2 and 11.0 mol of H2O in a reactor. Suppose as much as possible of the NO2 reacts.

How long does it take the Earth to rotation and revive

What is Charles' law formula?

Which stars have the highest absolute brightness? Select one: a. Supergiants b. Giants c. Yellow stars d. Dwarfs

What volume would 3.01•1023 molecules of oxygen gas occupy at STP?