Check all the phrases that accurately complete the following sentence:
A Bunsen burner can be ignited
when the gas supply is turned on.
when it is connected to a gas supply.
by holding the striker above the burner and
striking it.
when objects are nearby and can ignite.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.