Lesson Worksheet: Halogens Chemistry

In this worksheet, we will practice describing the compounds and reactivities of halogens and trends in their physical and chemical properties.

Q1:

Which of the following is a halogen?

  • AArsenic
  • BThallium
  • CAstatine
  • DSelenium
  • EGermanium

Q2:

Halogens can generally be found as diatomic molecules (e.g., I2). What type of bonding occurs in these molecules?

  • ACovalent
  • BMetallic
  • CIonic

Q3:

Which of the following is not a property of the halogens?

  • AThey have low melting points.
  • BThey are good thermal conductors.
  • CThey are colored.
  • DThey are poor electrical conductors.
  • EThey have low boiling points.

Q4:

As halogens increase in atomic number, which of the following trends is observed?

  • AToxicity increases.
  • BReactivity decreases.
  • CBoiling point decreases.
  • DMelting point decreases.
  • EAtomic radius decreases.

Q5:

Which of the following statements about the colors of halogens is correct?

  • AThe colors become darker as the atomic number increases.
  • BThe colors become lighter as the atomic number increases.
  • CThe lighter-colored halogens are less reactive.
  • DAstatine is likely to have a white color.
  • EThe colors do not have a pattern.

Q6:

Which statement explains why the different halogens in group 17 react in similar ways?

  • AThey all have seven valence electrons.
  • BThey all form diatomic molecules.
  • CThey are all colored elements.
  • DThey all have low boiling points.
  • EThey are all gases.

Q7:

Which of the following statements explains why reactivity decreases down group 17?

  • AAs the atoms get larger, the positive nucleus can attract an electron more easily.
  • BAs the atoms get larger, they become more closely packed.
  • CAs the atoms get larger, they contain more electrons.
  • DAs the atoms get larger, electrons are lost more easily.
  • EAs the atoms get larger, the positive nucleus cannot attract an electron as easily.

Q8:

A halogen displacement reaction is shown in the following equation: X+2Br()Br()+2X()22aqgaq

What is the color change that occurs when the bromide solution is converted to bromine gas? What halogen could X2 be?

  • AColorless to purple, chlorine
  • BColorless to brown, iodine
  • CColorless to brown, chlorine
  • DBrown to colorless, iodine
  • EBrown to colorless, chlorine

Q9:

As you descend group 17 from F2 to I2, intermolecular forces between the molecules increase. Which group 17 trend is the result of the increased intermolecular forces?

  • AMelting and boiling points increase down the group.
  • BHalogens have greater atomic mass down the group.
  • CThe colors of halogens get darker down the group.
  • DThe reactivity of halogens increases down the group.
  • EMelting and boiling points decrease down the group.

Q10:

Fluorine reacts with hydrogen explosively in cold conditions, whereas iodine and hydrogen only partially react even with constant heating. Which statement best describes why these differences are observed?

  • AFluorine is less dense than iodine.
  • BFluorine gains an outer electron more easily than iodine.
  • CIodine is a darker color than fluorine.
  • DHalogens increase in reactivity as you go down the group.
  • EThe fluorine atoms have gained an electron and formed negative ions.

This lesson includes 15 additional questions and 2 additional question variations for subscribers.

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