3rd Quarterly Review - Classification, Atomic Structure,

A mixture contains sand and salt. The sand can be separated from the salt during filtration because the substances in the mixture differ in

• solubility in water
• boiling point
• density at STP
• electronegativity

The following diagram represents a method of separating salt from water. Which of the following best describes this laboratory method.

• the salt will be separated from the water based on molecular weight
• the salt will be separated from the water based on the boiling point
• the salt will be separated from the water based on solubility
• the salt will be separated from the water based on air pressure

Which sample of matter can be separated into different substances by distillation?

• NaCl(aq)
• LiCl(s)
• CO(g)
• NaCl(l)

The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of copper.

• (62.93 u)(30.85) + (64.93 u)(69.15)
• (62.93 u)(0.3085) + (64.93 u)(0.6915)
• (62.93 u)(69.15) + (64.93 u)(30.85)
• (62.93 u)(0.6915) + (64.93 u)(0.3085)

What is the net charge of a ion that has 15 protons, 16 neutrons, and 18 electrons

• 18-
• 1+
• 15+
• 3-

Using, the Bright Line Spectra, which of the following element(s) are in the mixture?

• elements A, D, Z
• elements A, D, X
• elements A, D, X, Z
• only elements A and D
• All elements are present in the mixture

Which statement describes how an atom in the ground state becomes excited?

• The atom releases energy, and one or more electrons move to a lower electron shell.
• The atom releases energy, and one or more electrons move to a higher electron shell.
• The atom absorbs energy, and one or more electrons move to a lower electron shell.
• The atom absorbs energy, and one or more electrons move to a higher electron shell.

In an all neutral atoms of carbon, which of the following is always true?

• The number of protons will equal the number of neutrons
• The number of electrons will equal the number of neutrons
• The number of protons will be greater than the number of neutrons
• The number of electrons will equal the atomic number

Given the table below that shows student's examples of proposed models of the atom, which model correctly describes the locations of protons and electrons in the Bohr model of the atom?

• A
• B
• C
• D

An atom from a collected sample is determined to have 12 protons, 13 neutrons, and 12 electrons. What is the charge of the nucleus for this atom?

• 1+
• 0
• 12+
• 13+