I. 7th Grade Science
a. Compounds and Mixtures
b. Quarter: 1
II. Unit #2: Compounds and Mixtures Unit Length: 6 weeks
a. Unit Introduction: During this unit, students will discover that the basic elements can be chemically combined to form simple compounds and these substances have different properties than those of the elements from which they are made. That many different combinations of elements are possible, making a variety of substances. Additionally, students will discover that substances can be physically combined forming a mixture. Those mixtures of simple substances can be separated using the properties from which they are made.
b. Standards for Unit #:
CT State Grade Level Expectations (Draft)
GRADE-LEVEL CONCEPT 1:u Mixtures are made of combinations of elements and/or compounds, and they can be separated by using a variety of physical means.
GRADE-LEVEL CONCEPT 2: u Pure substances can be either elements or compounds, and they cannot be broken down by physical means.
SCIENTIFIC LITERACY TERMINOLOGY: Characteristic property, mass, weight, volume, density, solubility, boiling point, mixture, solution, particle, atom, element, molecule, compound, metal, non-metal, chemical reaction
c. Essential Questions:
1. How do compounds chemically combine?
2. What is the difference between a physical and a chemical change?
3. How can compounds have different properties than the elements that make them up?
4. How can a mixture be separated by using physical properties?
d. Essential Content/Concepts:
1. A compound is a substance made of two or more elements that are chemically combined.
2. A compound is represented by a chemical formula.
3. The smallest part of a compound is a molecule.
3. A substance that undergoes a physical change is still the same substance after the change.
4. A chemical change produces new substances with properties different than those of the original substances.
5. When elements are chemically combined, they form compounds, such as water and table salt that have properties that are different from the elements of which they are made.
6. A mixture is made of two or more substances that are not chemically combined.
7. Mixtures can be separated by physical properties such as particle size, density, solubility, and boiling point.
e. Essential Skills:
1. Separate substances in a mixture.
2. Compare and contrast the properties of water with those of hydrogen and oxygen.
3. Design and conduct appropriate types of scientific investigations to answer different questions.
4. Identify independent and dependent variables, and those variables that are kept constant, when designing an experiment
f. Vocabulary –
Compound, mixture, chemical change, physical change, solubility, boiling point, substance, molecule, chemical formula, solid , liquid, gas, rate of reaction,
g. Science Misconceptions
1. A physical change produces new substances.
2. A chemical change does not produce a new substance.
2. Reading for Information
3. Web or Library Research
a. “Compounds and Mixtures that Innovate” research compounds that have changed or advanced society. Examples are ceramics, plastics, Teflon, concrete, bronze, and steel
4. Multimedia Presentations
a. Discovering the Elements Part II (57:12) United Streaming Videos
IV. Significant Tasks (ST)
Significant Task 2: Separation of a Mixture (Lab packet)
1. Significant Task Introduction: The Separation of a Mixture Task will reinforce the experimental process. Using the “Lab Packet” students will identify and define variables for a scientific investigation. Write an appropriate procedure to solve the identified problem and conduct an investigation. Using suitable scientific tools the student will measure and use mathematical operations to calculate volume and density in metric units and record data, drawing conclusions and assessing their validity. Assessment: Lab Packet Rubric
b. Length/Timing: End of Unit 2
c. Essential Questions:
1. How are variables identified?
2. Why should procedures be detailed?
3. What information belongs in a data table?
d. Assessment Tools (AT): Lab Packet
Readings, Texts, Materials, Videos
Example Assessment Questions:
a. the souring of milk b. the burning of oil c. the melting of ice d. the rusting of iron
a. dissolving sugar in water b. boiling water c. freezing water d. electrolysis of water
a. forms one or more substances c. absorbs heat
b. releases heat d. absorbs electricity