Question

name: ____________ class: __________ date: ____________ use your text book to create a study guide for you assessment tomorrow. do not turn this in. take it home to study! section 1: multiple choice write the letter of the correct answer on the line. 1. which of the following are pure substances? a. solutions b. compounds c. homogeneous mixtures d. colloids 2. a substance that is made up of only one kind of atom is a(an)... a. compound b. homogeneous mixture c. element d. solution 3. what is the symbol for aluminum? a. al b. al c. au d. a 4. if a material contains three elements joined in a fixed proportion, it is a(an)... a. mixture b. solution c. atom d. compound 5. which of the following is a mixture? a. carbon dioxide b. silicon

Explanation:

Step1: Recall pure - substance definition

Pure substances include elements and compounds. Solutions, homogeneous mixtures, and colloids are mixtures. So for question 1, compounds are pure substances.

Step2: Recall element definition

An element is made up of only one kind of atom. So for question 2, the answer is element.

Step3: Recall chemical - symbol knowledge

The chemical symbol for aluminum is Al. So for question 3, the answer is Al.

Step4: Recall compound definition

A compound is made up of two or more elements joined in a fixed proportion. So for question 4, the answer is compound.

Step5: Recall mixture definition

Carbon dioxide is a compound, silicon is an element. A mixture contains two or more substances not chemically combined. But among the given options, if we assume there are more options not shown and based on the knowledge of these two substances, we know they are not mixtures. However, if we consider the general concept, we need to know that a mixture is a combination of substances. But from the given choices, this question seems to be incomplete in terms of options for a proper answer. But if we go by the knowledge of these two substances, they are not mixtures.

Answer:

1. b. compounds
2. c. element
3. b. Al
4. d. compound
5. (Incomplete options provided, but carbon dioxide and silicon are not mixtures as they are a compound and an element respectively)