A family of elements that has two electrons in its outer energy level is the

A test tube contains a pure colourless gas. It is either oxygen, carbon dioxide, hydrogen or nitrogen. When a burning splint is put into the gas it just goes out. you are allowed only one more test to identify the gas.

Write out the rule for determining total magnification of a compound microscope

A covalent bond always includes a pair of electrons. A. True B. False

What phase change is a type of. Physical change, chemical change, nuclear change, covalent change

A gas with a temperature of 98.0 degrees Celsius has a volume of 88.0 ml. The volume is increased to 100.0 ml. What is the new temperature in degrees celsius

Which characteristics belong to all members of the domain Eukarya? Check all that apply. have a cell wall are unicellular are multicellular have a nucleus or nuclei have a cell membrane

What is the total number of atoms in one unit of back

Is filtration is an effective method to purify water for drinking?

Does oxygen release thermal energy

Is adding chocolate syrup to milk a chemical or physical change?