Homework 38

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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. S^2- 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