Chemistry Exam Review

Determine the element according to the mass abundance data in the table.

• aluminum

• chromium

• magnesium

• sodium

Tags

NGSS.MS-PS1-1

A sample of lead is found to contain three isotopes: 23.5% of the sample has a mass of 204 amu, 24.1% has a mass of 207 amu, and the remainder has a mass of 208 amu. What is the average atomic mass of lead?

• 206.3 amu

• 207.2 amu

• 206.8 amu

• 82.0 amu

The following table shows the mass and abundance of three isotopes of element J. Which set up would calculate the average atomic mass of element J correctly?

• 15 + 50 + 35 / 3 = Average atomic mass of J

• Mass Z + Mass Y + Mass W / 3 = Average atomic mass of J

• (Mass Z x 0.15) + (Mass Y x 0.50) + (Mass W x 0.35) = Average atomic mass of J

• (Mass Z + 0.15) + (Mass Y + 0.50) + (Mass W +0.35) = Average atomic mass of J

Choose the correct Lewis Dot diagram for K2O.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The diagram represents the electron dot formula for the bonding of Mg and Cl. Which of the following are true for the bonding type involved in MgCl? Select TWO correct answers.

• The two electrons that the Mg atom loses are gained by the chlorine atoms.

• The one electron that the Mg atom loses is gained by the chlorine atom.

• The two elements join together in a covalent bond.

• The two elements join together in an ionic bond.

• The two elements join together in a hydrogen bond.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following are true regarding this electron dot structure? Select TWO correct answers.

• It represents an element that is classified as a noble gas.

• It represents an element that is from the halogen group.

• It represents an element that will readily give an electron away.

• It represents an element that will readily accept an electron.

• It represents an element that is a metal.

Which of the following are true regarding this element's electron dot structure? Select TWO correct answers.

• This is a group 13 element.

• This is a group 17 element.

• This element comes from a group that is stable.

• This element has three valence electrons.

• This element is in period three on the periodic table.

Tags

NGSS.MS-PS1-1

Which particles are represented by the dots in Lewis valence e-dot structures?

• core electrons

• valence electrons

• protons

• all electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following statements are true regarding Lewis Dot Structures? Select TWO correct answers.

• The mass number determines how the electrons will be arranged.

• They illustrate valence electrons with dots.

• They represent how valence electrons are distributed around atoms.

• The dots represent the protons and neutrons in the nucleus.

• All electrons are shown in a Lewis Dot Structure.

Tags

NGSS.HS-PS1-1

What element is representative of the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

• Boron

• Magnesium

• Chlorine

• Silicon