Filed under: Uncategorized
Monday – TSW write a poem or a song that explains the arrangement of particles in solids liquids & gases and the changes in states of matter. (7.12.spi.4 compare the motion and arrangement of molecules in solids, liquids, and gases.)
Tuesday – TSW present his/her poem or song to the class and take a group quiz over chapter 19 content.
Wednesday – TSW complete directed reading workbook pages from chapter 20,
7.12.tpi.5 classify a given type of mixture as homogeneous or heterogeneous.
Thursday – TSW contrast elements, compounds and mixtures. (7.12.spi.2 distinguish between elements, compounds, and mixtures (i.e. Na, Cl, NaCl, C, O2, CO2, H2, H20).)
Homework: Complete chapter 20 in the red workbook.
Friday – TTW conduct on oral review of key concepts from chapter 20 in preparation for next week’s quiz. TTW give students a copy of her chapter 20 notes and a concept map to complete over the weekend. (These notes are posted beneath the lesson plans for this week.)
Homework: Complete the concept back on the back of your chapter 20 notes. Write down any questions you have over the weekend and present them in class on Tuesday.
Chapter 20 quiz next Thursday!
Next week we will begin studying weather. This content tends to be a little intense so please make sure that your child studies his/her notes every night.
Chapter 20 Notes
• An element is a pure substance that cannot be separated into simpler substances by physical or chemical means. (Periodic Table of the Elements p. 666-667)
• A pure substance is one in which there is only one type of particle.
• There are three categories of elements: metals, nonmetals and metalloids (p. 527)
• A compound is a pure substance composed of two or more elements that are chemically combined. The compound is a new pure substance that is different from the elements that it is made of.
• Elements must combine in a definite ratio to make a compound. For example, water is always composed of two hydrogen molecules and one oxygen molecule (H2O).
• Some compounds can be broken down into elements through chemical changes. Other compounds may be broken down to form simpler compounds using chemical changes.
• A mixture is a combination of two or more substances (solids, liquids, gases) that are NOT chemically combined. The substances do NOT react to form a compound. Pizza is an example of a mixture.
- The components of a mixture do not have a definite ratio.
- Substances in a mixture retain their identity.
- Mixtures can be physically separated. (For example: Saltwater can be separated by heating it. When the water changes from a liquid to a gas, the salt remains behind. And you can pick the ingredients off of a pizza that you don’t like.)
• A solution is a type of mixture. It is a mixture that has one substance evenly dissolved into another. They are referred to as homogeneous mixtures because they look the same throughout.
• A suspension is a type of mixture. It is a mixture that has particles dispersed throughout, but the particles do not dissolve. They settle out like muddy water, Italian salad dressing and medicines that say shake well before use. Suspensions are referred to as heterogeneous mixtures because the different components are easily seen.
• A colloid is a type of mixture. Its particles do not dissolve into one another, but they do not settle out either. Colloids have properties of both solutions and suspensions. Examples of colloids are milk, mayonnaise, sick deodorant, gelatin and whipped cream.