Standing waves in Strings

Investigate and model the behavior of standing waves on strings and/or in pipes to relate quantitatively the fundamental and harmonic frequencies of the waves that are produced to the physical characteristics (eg length, mass, tension, wave velocity) of the medium

Chemistry Trial Paper – Difficulty: Moderate

Question 21) a) Explain how a primary standard base is prepared using an example. [4 marks] b) Justify the use of the above primary standard you used a primary standard [3 marks] Question 22) Outline the process used for a titration experiment with a strong acid of known concentration and a strong base of unknownContinue reading “Chemistry Trial Paper – Difficulty: Moderate”

The scientific Method

Aim: Hypothesis: Criteria for a hypothesis A hypothesis should be developed in response to previous research. It should be a testable and falsifiable statement which predicts the change of an independent variable and the result on the dependent variable followed with brief reasoning. Common scaffold’s for a hypothesis include: If [independent variable] then [depndent variable]Continue reading “The scientific Method”

Relative motion of objects in two dimensions

Relative motion of objects in two dimensions.
Analyse the relative motion of objects in two dimensions in a variety of situations, for example:
– a boat on a flowing river relative to the bank
– two moving cars
– an aeroplane in a crosswind relative to the ground

La Chatelier’s Principle & Collision theory

Explain the overall observations about equilibrium in terms of thecollision theory Learn. When an external stress (Change in temperature, pressure, concentration) is applied to a system in equilibrium. The system will respond in a way which minimizing the effect of the change. This is La Chatelier’s principle. Collision theory explain chemical reactions as successful collisionsContinue reading “La Chatelier’s Principle & Collision theory”

Reflection, refraction, diffraction, wave superposition

Explain the behaviour of waves in a variety of situations by investigating the phenomena of:– reflection– refraction– diffraction– wave superposition Learn. Mechanical waves are the net movement of energy, not the medium itself – it is important to remember this. When two waves move through the same medium and overlap, they interfere with one another,Continue reading “Reflection, refraction, diffraction, wave superposition”

Surface Area to Volume Ratio

Learn. The surface area to volume ratio (SA:V) is one of the underlying themes throughout biology. It explains why cells are as small as they are, why we developed systems to deliver food and oxygen to our cells, why some animals are large and thin whilst others are fat and small. The process of diffusionContinue reading “Surface Area to Volume Ratio”

Sample Trial Paper – Difficulty: Hard

Multiple choice (20 marks) 1. What is the IUPAC name of the following compound? (A) 1,3-dichloro-2-fluoro-2,3-dibromopropane (B) 1,2-dibromo-2-fluoro-1, 3- dichloropropane (C) 1,2-dibromo-1,3-dichloro-2-fluoropropane (D) 2,3-dibromo-1,3-dichloro-2-fluoropropane 2. Ethanol is often called a “universal solvent” since it can dissolve both polar and nonpolar solutes. Which property of ethanol makes it a suitable solvent for both organic and inorganicContinue reading “Sample Trial Paper – Difficulty: Hard”