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Monday, 26 February 2018

Bua-Determining Buoyant force


DATA TABLE
Object
Weight in Air
Apparent weight in water
Buoyant force
Volume of displaced water
Weight1
0.1 N
0.24 N
0.23N
0.1 ml
Weight2
0.2N
0.30N
0.28N
0.2ml
Weight4
0.8N
0.6N
0.2N
10ml
Weight5
1N
0.8N
0.2N
20ml
Weight6
2N
1.75N
0.25N
30ml
Weight7
2N
1.75N
0.25N
30ml
Weight8
5N
4.20N
0.8N
70ml
Weight9
8.5N
6N
2.5N
350ml



Wednesday, 14 February 2018

Bua-Electric charge lab


Launch LabHow can you bend water?

1. Infer Why did you rub the balloon on your sweaterPredict what might have happened if you simply touched the balloon to your sweater instead of rubbing it.
We rubbed the balloon to take the negative charges from the sweater.  If you just touch the balloon to your sweater instead of rubbing it, the charge may not transferred.
2. Key ConceptWhy do you think the balloon interacted the way it did with your sweater and with the stream of water?
Because the balloon gained electronsit has an unbalanced negative chargeBecause the sweater lost electronsit has an unbalanced positive charge. The stream of water bent toward the balloon.

Sunday, 19 November 2017

Exploring Color Lab

                                         
                                                             Exploring Color Lab
Materials
1. Flashlight
2. Color filters (Red, green, blue, yellow, purple)
3. A white paper


Activity A:Color by Addition

Red + Green = Orange/yellow

Red + Blue = Pink

Blue + Green = Light green

Red + Green + Blue = Yellow/white


Activity B:Color by Subtraction

          The color that appeared on a sheet of white paper when viewed through each filter.

Color filter
Results on a white paper
red
red
blue
light blue
green
green
yellow
yellow
purple
pink/purple

Saturday, 16 September 2017

Crystallization of Milk-Bua





Ingredients

-Chocolate milk
-Ice
-Salt
-Tray
-Zip lock bag
-Plastic frame
-Snacks 

Instructions 

1. Pour chocolate milk into a zip lock bag with a bit of air and put this bag in the tray. 
2. Pour salt on the a zip lock bag.
3. Put ice to cover the bag.
4. Use the plastic frame to shake it.
5. Put all the snacks inside the bag.
6. Wait until it's ready.

Questions

1)  why do we add salt to the ice?

Salt allows the temperature of the mixture around the ice cream to get colder.

2)   why do we add the cookies and other things, only after the milk has frozen slightly? If not, all the ingredients would mix together.

3)  what are two factors that affect the freezing you think?Ice crystals, and salt

4)  why do you need a bit of air in the bag?

It would make ice cream smoother.

Saturday, 3 June 2017

Volume, density and mass lab


Volume, density and mass lab

          To measure the volume of the irregular-shape items such as rocks, we can use water to do it.

In this lab, we filled 150 ml of water into a beaker and then put the rock into the water. The extra 

volume above 150 ml equals to the volume of the rock we put in. But sometimes the level of water 

was over 200 ml, so we use graduated cylinder to measure that volume.

               And to find density of the rocks, we have to divide the rock weight by its volume or use the 
formula of D=M/V.

Sample Number.
Weight gram
Volume ml
Density g/ml
1
125.6 g
50 ml
2.512 g/ml
2
135.6 g
50 ml
2.712 g/ml
3
46.0 g
50 ml
0.92 g/ml
5
45.0 g
45 ml
1.0 g/ml
6
111.3 g
50 ml
2.226 g/ml
7
244.5 g
77 ml
3.2 g/ml
9
199.2 g
100 ml
1.992 g/ml
11
98.8 g
19 ml
5.2 g/ml
12
147.0 g
60 ml
2.45 g/ml

 



How could you use the densities to identify the minerals?
          Different minerals will have different density. The same type of minerals would have the same density.

Would density or color be more useful in identifying a particular mineral?
          Density is more useful than color because each mineral has its own density but minerals can be same color.

Wednesday, 24 May 2017

The Impact of Environment-Bua

Writing Assignment 50 words-The impact of environment

   Acid rain

Acid gases are produced when fossil fuels like coal and oil are burned in power stations, factories and in houses. Acid gases go up into the sky, and when they mix with the clouds, it can cause rain - or snow, sleet, fog, mist or hail - to become more acidic.

When acid rain falls down, it affects trees, lakes, buildings and farmland. It can be very harmful to the environment. It also affects our health. When we breathe in air pollution, they can cause breathing problems.

When we burn fuels, sulphur and nitrogen are released into the air. Then they mix with water in the air and are transformed into different chemicals called 'sulphur dioxide' and 'nitrogen oxides'

The pH scale measures the strength of acids and alkalis.

+Gifpal