Chemistry Assessment

Eligible Texas EssentialKnowledge and Skills

Texas Education AgencyStudent Assessment DivisionSeptember 2010

Readiness standards have the following characteristics.

•They are essential for success in the current grade or course.

•They are important for preparedness for the next grade or course.

•They support college and career readiness.

•They necessitate in-depth instruction.

•They address broad and deep ideas.

Texas Education AgencyStudent Assessment DivisionSeptember 2010

Supporting standards have the following characteristics.

• Although introduced in the current grade or course, they may be emphasized in a subsequent year.

• Although reinforced in the current grade or course, they may be emphasized in a previous year.

• They play a role in preparing students for the next grade or course but not a central role.

• They address more narrowly defined ideas.

Texas Education AgencyStudent Assessment DivisionSeptember 2010

TEA is implementing a number of changes that should serve to test knowledge and skills in a deeper way.

• Tests will contain a greater number of items that have a higher cognitive complexity level.

• Items will be developed to more closely match the cognitive complexity level evident in the TEKS.

• In science, process skills will be assessed in context, not in isolation, which will allow for a more integrated and authentic assessment of these content area.

• In science, the number of open-ended (griddable) items will increase to allow students more opportunity to derive an answer independently.

Texas Education AgencyStudent Assessment DivisionSeptember 2010

Matter

Prior Knowledge

• Properties of solids, liquids, and gases

• Phase Changes

• Pure substances vs mixtures

• Physical vs chemical changes

Engage

Bags with

Balls

What should be taught…

Properties of the phases of matter are essential prior knowledge for understanding gas relationships, kinetics and intermolecular forces

Compressibility

Structure

Shape

Volume

What should be taught…

• Phase diagrams

• Heating curves

Heating Curves

Phase Diagrams

On the following phase diagram, label: solid, liquid, gas, triple point, and critical point; use the phase diagram to answer the 4 questions which follow.

1) What is the freezing point of this substance at 1 atmosphere? ________

2) What is the boiling point of this substance at 1 atmosphere? ________

What should be taught…

• Classifying matter based on the characteristics of pure substances vs mixtures

• Classifying matter based on the characteristics of elements vs compounds (CCRS)

• Separation techniques (CCRS)

Classifying mixtures as homogeneous or heterogeneous (CCRS)

–Oil and water– Salt and water– Lead pellets and water– Sand and water–Vinegar and water

Which mixtures are

heterogeneous?What do they

look like?

Separation Techniques (CCRS)

• Mixtures can be separated by physical methods like: distillation, filtering, chromatography

• Compounds can be separated by chemical changes which generally require energy like: heating, electrolysis

What should be taught…

• Physical vs chemical properties

• Physical vs chemical changes

• Intensive vs extensive / Intrinsic (CCRS)

Physical and Chemical

Properties

• Melting point and

boiling point

• Density

Changes

• Phase changes

• Dissolving

Density

An intensive (intrinsic) property

A ratio of 2 extensive properties: mass & volume

A block of maple wood with a volume of 4.05 cubic centimeters and a density of 0.67 g/cm3 is sawed in half. The density of the two smaller blocks is now

A. one-fourth the original density.B. one-half the original density.C. two times the original density.D. the same as the original density.

Identify the property described as physical/chemical and extensive/intensive.

• 40.0 grams of sugar is dissolved

in every 2 cups of Kool-aid. P E

• A copper pan left in water for 4

weeks shows signs of rusting. C I