Room 5 have been busy in the 2 weeks working on Kitchen Chemistry and Fair testing.
We have been learning about chemical and physical changes that take place when we do different experiments.
We are learning the differences between a chemical and physical change and also learning about fair testing.
Have a read about the different experiments we have been doing and have a go trying some at home:
How do you know when a Chemical change has taken place?
- A permanent change of colour
- The production of gas
- The production of light and/or heat
- The dissolving of a metal (the metal disappears)
- The production of an insoluble solid (a solid that cannot be dissolved)
How do you know when a Physical change has taken place?
- The object keeps its"identity”, nothing new is made.
- It might look different or feel different than when you first started but it is still the same thing. This is called changing form.
Experiment 1: Playing with Paper:
Today in Room 5, Mrs Dunatov, burnt a piece of paper to show us what a Chemical reaction looked like . We had to predict what we thought might happen. We also got to play with paper and try to think of different ways that we could change it!
When we burnt the paper, Mrs Dunatov, lit the paper in a pot so it was safe. We watched the paper burn and turn into ash. This was a Chemical change because something new was made and we could not turn the ash back into paper. However when we were folding and scrunching and drawing on paper, it was easy to see that it was still paper and we were only making Physical changes to it doing this!
Photos by Charlee and Tiana
Experiment 2: Making Popcorn:
Today Room 5 made popcorn. We had to predict what we thought might happen. We also had to guess whether it was a Chemical or Physical reaction.
We predicted that the popcorn kernels would pop and turn into white popcorn. We thought it would be fast. We also thought it was a chemical reaction as it made a smell, was hot, and turned from a hard, small, yellow kernel to a large, white, fluffy popcorn.
Our predictions were right except that it took a while to heat up the kernels enough for them to pop!
Photos by Charlee and Tiana
Experiment 3, 4 and 5: Baking Soda and Vinegar Experiments
Today we mixed baking soda and vinegar to perform 3 different experiments.
Balloon Blowing
We put baking soda into the bottom of a coke bottle then added a small amount of vinegar then Mrs Dunatov put a balloon over the mouth of the bottle and we watched what happened.
We predicted that there could be an explosion, a boom, a bang or the balloon could go up.
Our predictions were not quite right. The vinegar and baking soda mixed together and bubbled up and created a gas called Carbon Dioxide. This gas filled the balloon and blew it up. But there was no explosion or boom or bang!
Photos by Michael
Plastic Bag Explosions:
Mrs Dunatov put baking soda into a small packet of paper and poured vinegar into the plastic bags and put in the small paper with the baking soda in it. Then she sealed it and we waited for the reaction.
We thought it would make a big bang but the vinegar and baking soda didn’t create enough carbon dioxide to make the bag pop!
Photos by Michael
Bottle Volcano
Mrs Dunatov put a large amount of baking soda into a coke bottle and then poured a lot of vinegar in on top of it.
We predicted that there would be a big explosion like a volcano and maybe a bang.
The bubbles erupted over the top of the bottle and spilled out everywhere but they didn’t explode everywhere.
All of the experiments showed us that mixing baking soda and vinegar together will create a chemical change. We know this as the gas, Carbon Dioxide, was created and caused bubbles and the balloon to blow up.
Photos by Michael
Experiment 6: Hokey Pokey
Today we made Hokey Pokey in 2 groups. Mrs Dunatov didn’t tell us what we were going to do, she only showed us the ingredients of Golden Syrup, Baking Soda and Sugar and we had to predict what we thought would happen when they were all mixed.
We predicted that there might be an explosion, a loud bang, an eruption, a lot of mess, bubbles, carbon dioxide or an eruption.
When Mrs Dunatov took us to the staffroom, we found out that we were making Hokey Pokey and we were all very excited as we hadn’t made it before.
First we buttered the tray so that the Hokey Pokey wouldn’t stick to the bottom of it while it cooled.
We put 5 tablespoons of sugar into a pot followed by 2 tablespoons of golden syrup.
Then Mrs Dunatov put it on the stove and the heat from the stove melted the sugar and the golden syrup together.
When it started to boil and we could see the bubbles we added 1 teaspoon of baking soda.
It frothed up and became a new solid and smelt lovely!
Mrs Dunatov poured it onto the tray to cool.
We knew that a chemical change had taken place as a new solid was formed, we could not change it back into the original ingredients and it made bubbles. Not all of our predictions we were right but some of us were.
We got to eat it back in class and it was delicious!
Here is a link to the recipe if you would like to try it at home:
Photos by Marcellin
Photos by Patronilla
Experiment 7 : Planting plants and Fair Testing
We learnt about fair testing today and planted 12 seeds with different variables. We are looking forward to seeing what grows and what does not. Have a look at our predictions below and stayed posted for the results!!!
Fair
Testing: Plants Experiment|
1
|
Needs watering
|
Bean seed: Soil
Water
Window
Sill
|
Yes, we think this will grow as it has water, soil and
sunlight which is everything a plant needs to grow.
|
|
2
|
|
Bean seed: Soil
No Water
Window
Sill
|
No, we don’t think this will grow as it will not get any
water and it will get thirsty in the sun.
|
|
3
|
Needs watering
|
Bean seed: Paper Towel
Water
Window Sill
|
Yes, we think this will grow as the wet paper towel can act
like soil and it is getting water and sun.
|
|
4
|
Needs watering
|
Bean seed: Soil
Water
Cupboard
|
No, we don’t think it will grow at all as there is no sun
for it in the cupboard.
|
|
5
|
Needs watering
|
Pea seed: Soil
Water
Window
Sill
|
Yes, we think it will grow well as the only thing different
is that it is a pea seed.
|
|
6
|
Needs watering
|
Bean seed: Soil
Water
Table
|
Yes and No, we think it will grow ok but not as well as the
window sill as it doesn’t get as much sun.
|
|
7
|
Needs watering
|
Bean seed: Soil
Water
Square
container
Window
Sill
|
Yes, we think this will grow well as the only thing
different is the container.
|
|
8
|
Needs watering
|
Bean seed: Soil
Water
Mrs Sullings
Office
|
Yes, we think this will grow ok as it will get sun from Mrs
Sullings’ window and it has soil and water.
|
|
9
|
|
Bean seed: Soil
No Water
Cupboard
|
No, we don’t think this will grow as it has no water or
sunlight.
|
|
10
|
Needs watering
|
Bean seed: No Soil
Water
Window Sill
|
No, we don’t think it will grow as it has no soil.
|
|
11
|
|
Bean seed: No Soil
No Water
Window
Sill
|
No, we don’t think this will grow as there is nothing for it
to grow in and no water.
|
|
12
|
|
Bean seed: Soil
Water (only once)
Window
Sill
Lid on
|
Yes, we think it will grow but not very much as the lid will
shade it and make it hard for it to grow.
|
