Structure of Matter CFA

Which of the following is true about how hydrogen and oxygen can combine to form molecules?

• Hydrogen and oxygen can combine in many ways to form different molecules.

• Two atoms of hydrogen are always required to bond with two atoms of oxygen.

• When oxygen combines with hydrogen to make a molecule, water will always be produced.

• Molecules composed of hydrogen and oxygen must have at least four atoms.

Tags

OK.7.PS1.1

Which of the following best explains the relationship between molecules and atoms?

• Atoms are molecules that have a charge.

• Atoms have smaller parts, called molecules.

• Molecules are made up of two or more atoms.

• Molecules are atoms that have no mass.

Tags

OK.7.PS1.1

The extended structure of sodium chloride (NaCl) is shown. Which of the following describes the configuration of Layer 4 of the sodium chloride crystal?

• It will be identical in all of its characteristics to Layer 1.

• It will contain 4 atoms of chlorine and 5 atoms of sodium.

• It will have chlorine atoms in all four of its corners.

• It will have sodium that are bonded only to other sodium atoms.

Tags

OK.7.PS1.1

Students are asked to create models of molecules using marbles of different colors to represent atoms of different types. Included is a table describing the models made by four students. Which of the following is the most accurate evaluation of these models?

• Only Students 1, 2, and 4 created acceptable models, since molecules must be made of different types of atoms.

• All of the students created acceptable models because molecules can consist of many different configurations of atoms.

• Only Student 2 created an acceptable model of a molecule, since every molecule must have a balance of atoms.

• All student models are acceptable except that of Student 4, since molecules can’t be made of so high a number of atoms.

Tags

OK.7.PS1.1

Atomic models of graphite and diamond are shown. Graphite is a soft, dark material often used as a lubricant. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials?

• A. The arrangement of the atoms of each one

• B. The elements of which each one is made

• C. The number of atoms each one is made of

• D. The size and shape of the individual atoms

Tags

OK.7.PS1.1