Lesson Worksheet: Halogens Chemistry • 7th Grade
In this worksheet, we will practice describing the compounds and reactivities of halogens and the 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., ). 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:
What is the color change that occurs when the bromide solution is converted to bromine gas? What halogen could 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 to , 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.
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