Chemistry Worksheet

Which of the following is a chemical property of sodium?

• silver-white color

• density of 0.968 g/cm³

• soft at room temperature

• tarnishes when exposed to air

A mixture of iron and sulfur can be separated by attracting the iron particles with a magnet. If the iron and sulfur mixture is heated strongly, iron (II) sulfide forms. Iron (II) sulfide is no longer magnetic, and cannot be separated by physical methods. What is iron (II) sulfide?

• Element

• Compound

• homogenous mixture

• heterogeneous mixture

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of these statements accurately describes a trend in atomic radii in the periodic table? Select TWO correct answers.

• The atomic radius decreases as you go from right to left across a period.

• The atomic radius increases as you go from right to left across a period.

• The atomic radius decreases as you move down a group.

• The atomic radius increases as you move down a group.

• The atomic radius remains the same as you go from right to left across a period.

Which of these elements is the most reactive?

• Potassium

• Calcium

• Scandium

• titanium

Which element has the ground state electronic configuration, 1s²2s²2p⁶3s²3p⁶4s¹?

• calcium

• potassium

Tags

NGSS.HS-PS1-1

Which of the electron dot structures correctly illustrates diatomic nitrogen with a triple bond?

• :N≡N: with three shared pairs between the two N atoms

• :N=N: with two shared pairs

• :N:N: with one shared pair

Tags

NGSS.MS-PS1-1

Which of the following is the scientific name for LiCl?

• Chlorolithium

• lithium chloride

What is the chemical formula for the carbon tetrachloride?

• CCl3

• CCl4

• C3Cl

• C4Cl

Tags

NGSS.MS-PS1-1

Which statements of the following are true regarding the equation listed below? Fe + CuCl2 → FeCl2 + Cu Select TWO correct answers.

• The equation is balanced.

• The equation is not balanced.

• This is a synthesis reaction.

• This is a single-replacement reaction

• This is a decomposition reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many moles are there in 5.0 x 10^24 atoms of sulfur?

• 0.83 moles

• 8.3 moles

• 0.12 moles

• 12 moles