Which group of elements are considered to be in the same family?

A. helium, neon and argon

B. potassium, calcium and scandium

C. manganese, iron and cobalt

D. hydrogen and helium

3. How many moles are in 75g of Na20?

After the equilibrium represented above is established, some pure O2 (g) is injected into the reaction vessel at constant temperature.

What ion is primarily responsible for determining the ph of a substance? a. h+ b. oh- c. both of them?

What is responsible for creating the exerted by a gas

If enough heat is added to a substance, electrons begin to separate from the atomic nuclei. Which process does this describe? A. A solid turning into a liquid B. A plasma turning into a gas C. A gas turning into a plasma D.

Balance the following chemical equation: / text{CH}_ 4 + CH 4 + start text, C, H, end text, start subscript, 4, end subscript, plus / text{O}_ 2 / rightarrow 2 →start text, O, end text, start subscript, 2, end subscript, right arrow / text{CO}_2 +

How did the invention of the spectroscope in 1859 change the science of chemistry

Will zinc and sodium carbonate react?

What fraction of carbon 14 remains in an animal frozen in a glacier 18000 years ago?

How do you convert the number of molecules of a substance to the number of moles? a. add Avogardo's number b. subtract Avogardo's number c. multiply Avogardo's number d. devide Avogardo's number