Which of the following is an example of a physical property?

A) reacts with metals

B) hardness

C) changes color when burned

D) tarnishes

Which word (s) below is represented by the word "period" on the periodic table? a. group b. family c. energy level d. valence electrons

When steam is passed through red hot coke, a mixture of two gases is formed. Explain with reaction

Which of the following represents a physical change in matter

How many atoms of magnesium are in 1.00 gram?

What do you think Jose's grandmother meant by saying that the bread was too dense? What other things can you think of that are "dense"?

Draw the organic product of the following nucleophilic reaction

How does the energy of the activated complex compare with the energies of reactants and products? select one: a. it is lower than the energy of both reactants and products. b.

A student asked to convert measurements from liters to mililiters and from mililiters to liters. His answers are shown in bold in the choices shown below. On which choice did he make a mistake?

Donald is making a model of a nitrogen atom. The box for nitrogen in the periodic table is shown. To represent a neutral atom, which of these must Donald include in his model?

What are the charges and relative masses of the 3 main subatomic particles