Name: Total: ___ / 15 points
Topics: Matter and its classifications, chemistry, periodic table, compound symbols.
Purpose: To review concepts learned in lecture and to demonstrate understanding of the topics listed above.
Tasks: Fill out the boxes or draw or sketch as specified in each question. Follow the model below.
Model example to answer the homework questions.
E.g. Johll textbook page 23, Chapter 1, question 23. Identify each of the following substances as either a heterogeneous or homogeneous mixture. (1.3). Supplement: justify your choice.
Substance | Classification | Reasoning |
(a) Soil | __heterogenous | Can distinguish different colors and softness of different parts (dead leaf versus mud versus sand grain). |
(b) Air | __homogenous | All parts have the same properties (density, color) and it is a gas solution |
(c) Diesel fuel | __homogenous | It is a liquid with uniform properties and is a solution. |
(d) Concrete | __heterogenous | It is “chunky” and “bubbly” with rock bits and air voids bound by solid cement. |
Criteria: Points are specified for each question. Deductions will be made for missing, incomplete, or incorrect responses in 0.5-point increments.
Q1. (3 points) Johll textbook page 23, Chapter 1, question 2. What is the difference between compounds and elements? (1.3).
Compounds are pure substances with: | On the other hand, elements are pure substances with: |
Q2. (4 points) Johll textbook page 23, Chapter 1, question 4. Illustrate the difference between a heterogenous mixture and a homogeneous mixture by drawing two containers, each containing “●”, “∆”, and “▪” particles. (1.3).
Hints: have about 12 symbols in each container, don’t connect particles, which has particles spread evenly?
Heterogeneous mixture: | Homogeneous mixture: |
Q3. (2 points) Johll textbook page 23, Chapter 1, problem 20. Identify each of the following substances as either a pure substance or a mixture. (1.3). Supplement: part (b) changed to soda ash, part (c) is changed to air.
(a) Ethanol =
| (b) Soda ash = | (c) Air = | (d) Brass = |
Q4. (3 points) Johll textbook page 23, Chapter 1, question 12. Sketch the periodic table and indicate where metals, metalloids, and nonmetals are located. (1.5).
Hints: may use color or texture to distinguish regions; label regions or use a legend/key.
|
Q5. (3 points) Johll textbook page 24, Chapter 1, problem 34. Examine each of the elements and symbols listed below and correct any spelling errors or incorrect atomic symbols. If there are no errors, indicate by writing correct. (1.5).
Name and symbol | Write “Correct”, or write corrections here |
(a) Sulfer, Su | |
(b) Aluminum, Al | |
(c) Manganese, Mn | |
(d) Boron, Bo |