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Chemistry LibreTexts

Homework 38

  • Page ID
    28953
  • Q 1.36

    Question

    Classify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous.

    a. Plain yogurt b. Chicken noodle soup c. Titanium d. Table salt

    Solution

    What we know:

    A pure substance is made up of only one type of particle.

    A mixture is a substance composed of two or more particles.

    An element is a substance that cannot be chemically broken down into simpler substances.

    A compound is a substance composed of two or more elements.

    A heterogeneous mixture is one in which the composition varies from one region of the mixture to another.

    A homogeneous mixture is one with the same composition throughout.

    Solution:

    a. mixture, homogeneous

    b. mixture, heterogeneous

    c. pure substance, element

    d. pure substance, compound

    Q 4.75

    Question

    Write the electron configuration for each ion.

    a. Li+ b. I- c. S2- d. Al3+ e. Co2+

    Solution

    Strategy: Help can be found in the following link. 6.8: Electron Configurations

    Solution:

    a. [He]

    b. [Xe]

    c. [Ar]

    d. [Ne]

    e. [Ar] 3d7

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