Chemical+Reactions

= = Chemical Reactions

**1. Chemical and Physical change**
**P****hysical Change** is a change of state: (from solid to liquid to gas... or visa versa). How do the words melting, boiling, freezing and condensing fit with these changes of state? Try and put them in a sentence. Write this in your notes. Make a labelled diagram showing these changes.


 * Chemical Change** is when two chemicals react together to form a new chemical.
 * Tell tale signs of a chemical reaction are... a change of colour, a change in temperature, the formation of a product, or when one of the products is completely used up.
 * You can tell what the rate of reaction is by the speed at which changes occur. An explosion is a chemical reaction which happens at a very fast rate (rate of reaction).

//Use these hints to improve your answers in the following prac.//

**Experiment 2.1 Observing reactions**
WORK IN PAIRS but each person must complete their OWN report.

Write a laboratory report which including:


 * Aim:** To observe a variety of chemical reactions and discover the signs that a chemical reaction has taken place.
 * Method:** Just write refer to Science for Life 8, page 23
 * Results:** Record all your observation here. You should make these in a table with the headings of Reaction 1, Reaction 2 etc
 * Discussion:** Talk about your results. How did they relate to the aim of the experiment. What signs were there that a chemical reaction had occurred?
 * Conclusion:** Briefly talk about the experiment you performed and then summarise the signs that a chemical reaction has taken place.


 * SUBMIT TO SIMON **

Like to know more? Try "Science with Tom"

What are the signs that a chemical reaction has taken place?

Investigation: Rusting
Review evidence of chemical reactions

There are two alternative practical experiments for this topic. Your teacher will tell you which one you are to complete. They are both a chance to be a real scientist!!


 * 1) [[file:Rusting Investigation.pdf]] (student designed)
 * 2) Rusting investigation page 25 of Science for Life 8.
 * There are three parts to this experiment
 * A: takes one week. You will begin it today and record and interpret your results the following week.
 * B: is your own design. You can try something in class, or if you need more time, try doing it at home, in two jars above the kitchen sink.
 * C: takes two days. In this cool experiment you can see how much oxygen is used in rusting by how much the water level changes.





Write up a prac report using keynote.


 * SUBMIT RESULTS TO SIMON **

=Rusting investigation practical write up:=

Please complete the following sections for your report. You may submit it written in pages or may also record your discussion and conclusion section.

In the **discussion** section you should consider the following:


 * What were the results?
 * Where there any nails that didn't rust?
 * Which nail rusted the most? What were the conditions?
 * Which nail rusted the fastest? What were the conditions?
 * Which nail rusted the least? What were the conditions?
 * Were the any unexpected products produced? What did they look like. Do you think this happened in other peoples with similar reaction conditions?

In the **conclusion** section you should include the following information: > Submit the finished report, including pictures to SIMON
 * What you did (what were you testing?)
 * How you did it (what tests did you perform)
 * What the results were (sum it up, which nail rusted the least and the most)
 * Any improvements for the future (If you were to do a similar experiment again, what differences would you make to the design of the experiment.. i.e. would you use smaller nails or different water? Would you use less or more salt...)

**2. Types of Chemical Reactions**
Explain what each of the following reaction types are. Now, list the various signs which will tell you the type of reaction occurring.


 * Exothermic reactions**


 * Endothermic reactions**


 * Photochemical reactions**

Do the experiment page 27 and write a small lab report.


 * 3. Rate of reaction**

Explain the difference between a slow and a fast rate of reaction. Give four examples of each type of reaction.

Complete the following practical activity: . Read p34-37 Catalysts and Enzymes __Pick a task__:
 * 4. Catalysts + Enzymes**

Make a claymation which shows how __enzymes__ work. You need to show the substrate, the enzyme and how they fit together. You should also show what happens when the enzyme denatures. You either need to narrate your film or add text to it.

OR

Make a claymation which shows how __catalysts__ work. You need to show the reactants and the products and how they fit together. You should also show what happens when the enzyme denatures. You either need to narrate your film or add text to it.

__How to do it__: http://www.iherr.com/?page_id=6 media type="youtube" key="vb4mhHNLrZQ" height="349" width="560" media type="youtube" key="ipE3nCjI0IU" height="349" width="560"

MAKE a video on iMovie which explains what the law of conservation of mass is AND give an example. You may wish to film your self eating something on scales OR film some reactions, do an iStop motion movie or use some plasticine.
 * 5. The Law of Conservation of Matter**

Glogster task: