Worksheet: Halogens

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 halogens is a solid at room temperature?

  • AFluorine
  • BBromine
  • CIodine
  • DChlorine

Q6:

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.

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:

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.

Q9:

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

Q10:

Which change in periodic trends is observed in halogens as we go down the group?

  • ALower density
  • BLower melting and boiling points
  • CHigher melting and boiling points
  • DLighter color
  • EGreater reactivity

Q11:

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.

Q12:

Which of the following equations shows a displacement reaction involving chlorine?

  • ACl+HOHClO+HCl22
  • BCl+2KBr2KCl+Br22
  • CCl+MgMgCl22
  • DCl+2Na2NaCl2
  • ECl+H2HCl22

Q13:

A sample of the radioactive halogen astatine large enough to be visible to the human eye has never been created. If such a sample were created, which of the following statements about its physical state and color would most likely be true?

  • AIt would be a dark-colored gas.
  • BIt would be a light-colored gas.
  • CIt would be a light-colored crystalline solid.
  • DIt would be a dark-colored crystalline solid.
  • EIt would be a brown-colored liquid.

Q14:

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.

Q15:

Which of the following statements about group 17 elements is correct?

  • ABromine will react with a solution of sodium chloride.
  • BIodine has a lighter color than chlorine.
  • CBromine will react with a solution of sodium iodide.
  • DAt room temperature and pressure (RTP), fluorine has a higher density in gram per liter than chlorine.
  • EBromine has a higher melting point than iodine.

Q16:

Which of the following is the electron configuration of a halogen?

  • A2, 8, 4
  • B2, 8
  • C2, 5
  • D2, 7
  • E2, 6

Q17:

When the following reactants are combined in individual experiments, how many chemical reactions will take place? Cl+2KBrCl+2KIBr+2KClBr+2KII+2KClI+2KBr222222

Q18:

Which of the following halogens could be reacted with sodium chloride to prepare chlorine gas?

  • AFluorine
  • BIodine
  • CChlorine
  • DBromine
  • EAstatine

Q19:

Based on their melting points, give the correct order of the following halogens starting with the highest one.

  1. Chlorine
  2. Iodine
  3. Bromine
  4. Fluorine
  • A4, 1, 3, 2
  • B3, 4, 2, 1
  • C2, 3, 4, 1
  • D3, 2, 4, 1
  • E2, 3, 1, 4

Q20:

What is the correct order of the following halogens according to their atomic size, starting with the largest one?

  1. Chlorine
  2. Iodine
  3. Bromine
  4. Fluorine
  • A2, 3, 4, 1
  • B3, 2, 4, 1
  • C3, 4, 2, 1
  • D2, 3, 1, 4
  • E4, 1, 3, 2

Q21:

Which of the following is not a property of bromine?

  • AIt is slightly miscible with water.
  • BIt is miscible in nonpolar solvents.
  • CIt reacts directly with most metals to form ionic bromides.
  • DIt is less reactive than fluorine.
  • EIt is freely miscible with water.

Q22:

The melting points of the following halogens are listed in the table, with the exception of that of bromine.

Halogen Fluorine Chlorine Bromine Iodine
Melting Point 220C101C114C

Based on the values in the table, in which temperature range would the melting point of bromine most likely lie?

  • A4160C
  • B141160C
  • C101120C
  • D1130C
  • E910C

Q23:

Fill in the blank: Increasing the atomic number of halogens leads to .

  • Aan increase in the chemical reactivity
  • Ban increase in the toxicity
  • Can increase in the valence electrons
  • Dan increase in the melting and boiling points
  • Ea decrease in the atomic radius

Q24:

Fill in the blank: Chlorine is added to swimming pools to disinfect water as a result of its conversion to .

  • Acalcium chloride
  • Bsodium chloride
  • Cchloride ions
  • Dhypochlorous acid
  • Ehydrochloric acid

Q25:

Based on their chemical reactivity, give the correct order of the following halogens starting with the highest one:

  1. Chlorine
  2. Iodine
  3. Bromine
  4. Fluorine
  • A2, 3, 1, 4
  • B4, 1, 3, 2
  • C3, 2, 4, 1
  • D2, 3, 4, 1
  • E3, 4, 2, 1

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