Marking Guidelines: Student name: _____________________________________ Class Teacher’s Name: ___________________ Knowledge and understanding 1. Defines what an acid and base is in accordance with Arrhenius and Bronsted-Lowry. Criteria OR Mark • defines an acid and a base using Arrhenius therory • defines an acid and a base using Bronsted-Lowry theory 2 •defines an acid and a base using Arrhenius therory 1 • defines an acid and a base using Bronsted-Lowry theory Not demonstrated/non-serious attempt 0 2.Explain the limitations of the Arrhenius and Bronsted-Lowry theories. Criteria • Makes an informed judgement about the limitations of the Arrhenius and B-L theories using models to demonstrate your answer. • Includes at least TWO relevant examples to show the limitation of Arrhenius and B-L • Makes a judgement about the limitations of the B-L model • Includes at least ONE relevant example OR 5 4 • Outlines a limitation of either the Arrhenius or B-L model • Includes an example for the model they provided a limitation for. • Outlines a limitation of one of the models AND • Includes at least ONE relevant example OR Mark • Outlines a limitation 3 2 • provides an example • Provides some relevant information Not demonstrated/non-serious attempt 1 0 3. Assess the usefulness of the Bronsted–Lowry model in classifying acids and bases. Criteria • Makes an informed judgement about the usefulness of the B-L model which highlights the reason we use B-L and not the other when looking at acids and bases • Considers an advantage of the B-L model and also reiterates the limitation from the above section to explain the usefulness of the model • Includes at least TWO relevant equations to show why the B-L model works so well in explaining acids and bases. Mark 5 • Attempts to makes a judgment about the usefulness of the B-L model • Considers an advantage of the model • Includes at least ONE relevant equation OR 4 • Outlines an advantage of the B-L model • Includes at least TWO relevant equations • Outlines an advantage of the model AND • Includes at least ONE relevant equation 3 • Outlines an advantage and/or limitation of the model 2 • Provides some relevant information 1 Not demonstrated/non-serious attempt 0 4. Demonstrates clearly the differences between strong, weak, concentrated and dilute acids and bases, using animations or models. Criteria • Demonstrates an extensive knowledge and understanding of strong, weak, concentrated and dilute acids. AND • Effectively uses animations and/or models. • Demonstrates a thorough knowledge and understanding of strong, weak, concentrated and dilute acids. AND • Effectively uses animations and/or models. Mark 5 4 • Demonstrates a sound knowledge and understanding of strong, weak, concentrated and dilute acid with appropriate animations, models or images. 3 • Demonstrates a basic knowledge and understanding of strong, weak, concentrated and dilute acids with animations, models or images. 2 • Provides some relevant information. 1 Not demonstrated/non-serious attempt 0 Working scientifically 5. Demonstrate your knowledge and understanding by using ionic equations to show the dissociation of acids and bases in water and the formation of conjugate acids and bases. Criteria Mark • Using ionic equations correctly shows the process of dissociation of acids and bases and the formation of their conjugate acids and bases. • Links this information to a model from the above section to clarify explanation. • Provides some steps in the equation. Not demonstrated/non-serious attempt 2 1 0 6. Demonstrate the application of your knowledge and understanding through calculating and then modelling: a. the pH of an acid and a base when diluted in water Criteria Mark • Correctly chooses an example to calculate the pH of an acid and base when diluted in water. • Refers to a model to demonstrate the results in the calculation 3 • Correctly chooses an example to calculate the pH of an acid or base when diluted in water. • Refers to a model to explain calculation 2 • Attempts a calculation using a model 1 Not demonstrated/non-serious attempt 0 b. pH, pOH, [H+] and [OH-] for a range of solutions. Criteria • chooses FOUR relevant examples for the calculation and demonstration of pH, pOH, [H+] and [OH-] for a range of solutions • calculates all examples, showing relevant working and rounds off to the correct decimal places. • refers to at least TWO models when explaining the FOUR calculations • Provides only THREE relevant examples for the calculation and demonstration of pH, pOH, [H+] or [OH-] for a range of solutions Mark 4 3 AND • calculates all examples, showing relevant working and rounds off to the correct decimal places. • refers to a model when explaining the THREE calculations OR • provides most steps of the FOUR relevant examples • Provides some steps of the calculations. 2 • Provides some relevant information. 1 Not demonstrated/non-serious attempt 0 7. Overall multimedia presentation Criteria OR Mark • The multimedia presentation is clear, succinct and flows logically in all parts. 3 • The multimedia presentation is clear in most parts. 2 • The multimedia presentation had some technical issues. 1 • submission was not a multimedia presentation 0 • non-serious attempt 8. Harvard Referencing Criteria Mark • Referencing evident throughout presentation where appropriate (inserted as an image in the bottom right hand corner of presentation) • Extensive reference list provided at the end of presentation to finish the preserntartion 3 • Reference list from relevant resources provided at the end of presentation 2 • references provided but not in Harvard. 1 • no referencing 0 Raw Mark Scaled Mark Knowledge and understanding /17 /10 Working scientifically /15 /10 Total /20 Comments Two things you did well Two things to improve on
