Year 11: AS 90954 Demonstrate understanding of the effects of astronomical cycles on planet Earth

Homework exercise in preparation for the internally assessed achievement standard AS 90954 Demonstrate understanding of the effects of astronomical cycles on planet Earth.

Produce a report in two parts.

Part 1

Describe in detail using information, visual representations, and data the astronomical cycles listed below.

  • Spin of the earth on its axis
  • Orbit of the earth around the sun.
  • Effect of the Earth’s tilt and the heating effect of the Sun.

Part 2

Describe in detail using information diagrams and dat the effect of these cycles on the earth with respect to:

  • Day and night
  • Seasons
  • Changes of temperature during the day and night

Seasonal changes at the North and South poles, latitude of New Zealand, Tropics of Cancer and Capricorn, and the Equator

To be handed in next Monday. The report is your first attempt at using this material. Create your own diagrams and tables. DO NOT cut and paste

Places you will find information include your text book (feel free to use it you have paid for it) wikipedia and youtube.

 

 

Structure and Bonding: Introduction

The blocks of the old auditorium are small and held together with mortar. The eight tonne slabs of the new building have an extended structure that is tied together tightly with steel rods.

 

The blocks of the old auditorium are small and held together with mortar. The eight tonne slabs of the new building have an extended structure that is tied together tightly with steel rods.

Chemists have very specialised skills. Architects understand the materials they work with and the forces that hold them together. They can design structures that have never been built before. Architects have designed the new auditorium.

 

Chemists do exactly the same thing at the atomic, molecular or ionic level.

 They can design new molecules with a specific  purpose, to lower blood pressure, blood cholesterol or to conduct electricity like metals. Whether its quick drying paint that will protect the outside of your house for the next 10 years or an insecticide to kill the stink bugs munching happily in the vege garden a chemical architect will draw up a solution.

Chemical architects work with only three types of particle, atoms molecules and ions. The size and types of force between these particles determines many of their properties such as melting point, solubility and electrical conductivity.

In the structure and bonding topic you are constantly referring to three questions:

  1. what are the particles (atoms ions or molecules)?

  2. What are the forces holding these particles together (ionic covalent metallic or Van der Waals bonds)?

  3. What are the properties (melting point, solubility and electrical conductivity)

With Van der Waals forces shapes of molecules, electronegativity and polarity are also important. Molecular shape can be predicted from  Lewis diagrams and Lewis structures. That is just about everything?

Make sure that you understand everything in the video before moving on to the next section
 

 

 

Bacterial Basics

Check out the following:

  • Bacterial basics
  • How bacteria live: Extra cellular digestion
  • Watch a white blood cell chase a bacterium and absorb it…a horrible end
  • Bacteria dividing

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