Tagged: experiments

Year 8 Science – Elements and Compunds

Froth flotation

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This term we have been studying the elements of the periodic table, comparing elements and their compounds and discovering the properties of metals and non-metals. Find out more about the elements at the Interactive Periodic Table. This site, The Periodic Table of Videos, has videos with experiments and information about most of the naturally occuring 92 elements. The Minerals Council of Australia have some excellent resources to help our learning about the earth’s minerals, including “Oresome Froth” (how metals are extracted from their ores) and “Metals Matter” (use a virtual metal detector to discover the metal composition of everyday household objects). While I am on the Year 6/7 camp at Roses Gap this week you can explore the above sites and revise for the test which will be on March 12th.

After the earthquake off the coast 0f Chile this weekend, you may be interested in this animation from the BBC which shows how eathquakes cause tsunamis.

Today’s task – Year 7 Maths and Science

releasing leaf hoppers

Firstly, congratulations for participating in the biological control of bridal creeper using leaf-hoppers, the DPI project we completed last term. The leaf hoppers we bred in class were successfully released at Hawkesdale Apex Park during the last week of term 3. We hope many of them survived the cold and wet weather we had over the September school holidays!

Today we will be looking at two tasks on the computers – (1) continuing our Beetle Game (Maths 300) to learn more about probability and long-range frequencies and (2) entering our paper aeroplane data onto the Google docs. spreadsheet to compare our results with other students.

(1) Go to Maths 300 on the intranet and choose “Beetle Game”. Click on “Make a Beetle” and then play ten games by clickoing on “Auto” and then clicking on the space bar. What do your results suggest? If this was a carnival game, how would you organise the cost and prizes so that you can make some money? Then go to “Make many beetles” and choose how many people you think will play the game at a school fete or carnival. How do you think you should organise the prizes now?

(2) Go to the Google spreadsheet “Paper Aeroplane Flight Distance data” and enter your results from five trials. Calculate the mean, using a calculator and then check using the formula option in the spreadsheet. Compare your results with other students’ – how did your plane go? How can you improve your design to increase your flight distance?

(3) If you have completed the above tasks, write a blog post about one of the three activities – releasing leaf hoppers to control bridal creeper, the “Make a beetle” game or Paper Aeroplane project.

aeroplane prac1

Forces and Simple Machines

simple machine

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This week in Year 7 Science we will be looking at Forces – conducting experiments using contact forces (friction, bouyancy and surface tension) and non-contact forces (gravity, magnetism and electr-static forces). In Year 8 Science we will be studying Simple Machines – inclined planes, levers, the wheel and axle, pulleys and gears. One of the best sites to find resources for these units of work is Science-Class-net. There are hundreds of activities, demonstrations, experiments, graphic organisers, quizzes and slideshows about all science topics. I am very grateful to Mr. Poarch, a retired science teacher, for sharing all his wonderful resources collected over a lifetime of teaching and making them accessible on the internet.

Acids and Bases – Year 8 Science

Today we will be doing an experiment with acids and bases – making a pH indicator using red cabbage and testing various household substances. PH is a measure of the acidity (ph is less than 7) or alkalinity (ph is greater than 7) of a substance.

Here is a similar experiment to the one in your textbook. Acids and bases from Vision Learning, includes a colour chart and pH of various substances. Good information from Chemistry 4 kids here.

Separating Mixtures

Today the Year 7R science class successfully separated a mixture of salt, sand, rice and iron filings. We used a range of methods of separation including seiving, magnetic separation, filtering, decanting and evaporation and crystallisation. All the images have been saved in a folder called “Separating Mixtures” in the year 7 Science folder on the Student Public drive. Use these images to create a Photostory (with audio) or a PowerPoint (with text) describing the procedure you used to separate the materials and how successful you were in collecting pure materials. How would you improve your method if you did this experiment again? How were some of the materials lost?

See Katie and Chloe’s PowerPoint of the process they used here.

Cody and Dylan’s Video here: seperating-mixtures

Physical or Chemical Change?

 

 The Science Class site has some excellent experiments, videos and demonstrations of physical changes and chemical reactions. This one is about observing the changes when a sugar cube is heated: changing_sugar.pdf Have you ever seen spaghetti dance? You can do this experiment with sultanas as well.

Check out our Voicethread here: Physical or Chemical Change?

Watch our video here: Four Simple Chemical Experiments

Year 8 students performed these experiments during the last week of term – are they physical changes or chemical reactions?

1.Heating Copper carbonate

2. Mixing Hydrochloric acid and Magnesium metal.

3. Mixing Barium chloride and Sodium sulphate.

4. Mixing Steel wool and Copper sulphate.

Online Quizzes

The Science of Toys with the CSIRO

Students working out how different size frogs make different sounds.

Students working out how different size frogs make different sounds.

 Today we welcomed Simon from the CSIRO “Labs on legs” program to the school for National Science Week. He presented two workshops to prep to year 5 students about the science behind how toys work. Students learnt about:

  • what is inside a baby doll,
  • how to make a slinky ‘walk’,
  • which spinning tops work best,
  • how a ‘magna-doodle’ works,
  • what is inside a kaleidoscope,
  • how to make a toy car do two 360 degree loops,
  • how to measure the speed of a toy car
  • why different size frogs make different sounds and much more……………