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Identifying Unknown Samples Part I

During this segment, the students perform a lab to test and identify four unknown samples.

During this segment, the students perform a lab to test and identify four unknown samples.

Premiere Date: July 11, 2016 | Runtime: 00:03:31

Support Materials

Toolkit

Qualitative Analysis Lab
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Unit 5D Note Taking Guide & Segment Questions
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Crosscutting Concepts

Cause and Effect

Mechanism and explanation. Events have causes, sometimes simple, sometimes multifaceted. A major activity of science is investigating and explaining causal relationships and the mechanisms by which they are mediated. Such mechanisms can then be tested across given contexts and used to predict and explain events in new contexts.

Science & Engineering Practices

Generating a Hypothesis and Developing a Model

Modeling can begin in the earliest grades, with students’ models progressing from concrete “pictures” and/or physical scale models (e.g., a toy car) to more abstract representations of relevant relationships in later grades, such as a diagram representing forces on a particular object in a system. (NRC Framework, 2012, p. 58)

Planning and Carrying Out Investigations

Students should have opportunities to plan and carry out several different kinds of investigations during their K-12 years. At all levels, they should engage in investigations that range from those structured by the teacher—in order to expose an issue or question that they would be unlikely to explore on their own (e.g., measuring specific properties of materials)— to those that emerge from students’ own questions. (NRC Framework, 2012, p. 61)

Vocabulary

activity series - a list of metals or non-metals in order of decreased reactivity.

chemical change - any change that results in the formation of a new chemical substance.

coefficient - a number in front of a chemical substance that represents the quantity needed for a reaction.

combustion reaction - a type of chemical reaction that occurs when carbon and hydrogen compounds react with oxygen to produce carbon dioxide and water.

decomposition reaction - when one reactant breaks apart into two or more products.

double displacement reaction - a type of chemical reaction that occurs when the like ions of two ionic substances displace each other to form new substances; also known as a double replacement reaction.

law of conservation of matter - matter cannot be created or destroyed, it just changes from one form to another.

matter - anything that has mass and takes up space.

physical change - a change which alters a substance without altering its composition.

precipitate - a solid substance formed in a solution during a chemical reaction.

product - a substance formed as the result of a chemical reaction.

reactant - a substance that takes part in and undergoes change during a chemical reaction.

single displacement reaction - a type of chemical reaction that occurs by the transfer of electrons, so that a neutral substance displaces a like-charged ion in a compound so that it becomes neutral; also known as a single replacement reaction.

solubility table - a table which displays the ability of a substance to dissolve or dissociate in water or an acid.

synthesis reaction - a reaction that combines two or more reactants to form one product. 

Georgia Standards of Excellence

SC2Obtain, evaluate, and communicate information about the chemical and physical properties of matter resulting from the ability of atoms to form bonds.

SC2.fDevelop and use bonding models to predict chemical formulas including ionic (binary and ternary), acidic, and inorganic covalent compounds.

SC3Obtain, evaluate, and communicate information about how the Law of Conservation of Matter is used to determine chemical composition in compounds and chemical reactions.

SC3.aUse mathematics and computational thinking to balance chemical reactions (i.e. synthesis, decomposition, single replacement, double replacement, and combustion) and construct an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.

SC3.bPlan and carry out investigations to determine that a new chemical has formed by identifying indicators of a chemical reaction (specifically precipitate formation, gas evolution, color change, water production, and changes in energy to the system should be investigated).

Request Teacher Toolkit

The Chemistry Matters teacher toolkit provides instructions and answer keys for labs, experiments, and assignments for all 12 units of study. GPB offers the teacher toolkit at no cost to Georgia educators. Complete and submit this form to request the teacher toolkit. You only need to submit this form one time to get materials for all 12 units of study.