Yeast experiment

On Unit 3,Cell Division, we are doing an experiment about yeast on how they bud.There are flask A and flask B.On flask A we add yeast and hot water only. On flask B we added yeast ,hot water and sugar.We placed balloons on top of the flasks.On flask A the balloon  inflate a bit.On flask B, the balloon inflates bigger.I concluded that the yeast needed energy to bud.When it buds, carbon dioxides are released.The balloon soon inflates bigger.It was a very great experiment in the science lab.

  

The Talk Show

On Science we had project which was doing a talk show. In this project I'm working in a group which was with Stanley, Kayla, Chepal, Jennifer and me. There researcher, Host and Resource man. We researched about how to take care of us and the others. There was a lot of debation. At last we wrote about how to help tsunami victims. The talk show goes well. Chepal becomes the Host and Stanley becomes resource man. At last we did it. It was a very fun project .

en.wikipedia.org/wiki/Talk_show

yeast budding experiment

On Unit 3,Cell Division, we are doing an experiment about yeast on how they bud.There are flask A and flask B.On flask A we add yeast and hot water only. On flask B we added yeast ,hot water and sugar.We placed balloons on top of the flasks.On flask A the balloon  inflate a bit.On flask B, the balloon inflates bigger.I concluded that the yeast needed energy to bud.When it buds, carbon dioxides are released.The balloon soon inflates bigger.It was a very great experiment in the science lab.

yeast budding experiment link

Electric Circuits

Reflection of the Electric Circuit-building activity

I felt very fun building the electric circuit. I learnt how to make parallel and a series circuit. I also learnt that if one light bulb in a series circuit is blown the others will also turned off, while in a parallel circuit when a light bulb is blown the others wouldn’t.  It’s very fun building an electric circuit.

Light and Heat

Refraction of light

Light travels in a straight line but when it enters another medium it would be seen to bend.

How does a lens work?

A lens is a plastic or glass, which refracts light to form an image. When we look through a lens it will seemed like it was distorted. This because light undergoes refraction as it travels from air to glass and back to air again. Lenses are usually used to magnify objects. The examples are magnifying glass, microscopes, spectacles, cameras and telescopes.

Dispersion of light through a prism

White light is actually made up of different colours. We can prove this by shining white light to a prism, a a transparent plastic or glass object with smooth surfaces and can refract light. It occurs because, light travels at different speeds and the different colours refract at different angles as they pass through a prism.

Dispersion of light through water droplets

Water droplets can also act like a prism. The water droplets refract on sunlight.

Transfer of Heat

Conduction: Heat is transferred from one object to another. The example is, from the heat of boiling water to a spoon.

Convection: The transfer of heat from one region to another by the movements of fluids. The example is, from cold water to hot water.

Radiation: It is the release of heat from the surface

Annual project The annual project is very fun we made the pyramid,miniature ,ratio posters, booklet and also the PPT.

Seperating mixtures Seperating mixtures can be done by sieving,decanting,filtration,desalination and evaporation.

Physical and chemical change When physical change is is done,no new materials are formed while when physical change is done,new materials are formed.

Human population Factors affecting human population size -Birth rate    The birth rate isthe number of live babies born ina year for every 1000 people.   A high birth rate:    -Early marriges    -Lack of knowledge of birth control -Death rate The death rate is the number of people dying in a year for every 1000 people.   A high death rate:    -diseases     -famine    - natural disasters -Decrease in population size   A people considered ageing when:    -people under the age of 15 make less than 30% of the population.    - people above the age of 65 make up more than 6% of the population. People density Human migration is human movement from one area to another. Immigration Immigration takesplace when people move to another country permanently. Emmigration Emigration takes place when people move out of the country permanently.

Pollutions Air Pollution Air pollution occurs when harmful subtances are realeased into the air. Causes of air pollution -burning of fuels,rubbish and forests    Burning of fuels produces black smoke which are harmful to the environment.    Burning of rubbish released poisonous into the air.    Burning of forests also cause huge amount of smoke into the air. -Dust and dirts in the air    When we breathe the air in lookedto be clean but actually there are a lot of       dusts and dirts in the air. -Smoke from cigarettes   Cigerretes consists of harmful subtances which is harmful to the environment. Effects of air pollution -health prolems    Dirts in the air causes eye iritation.    Cigerrets can leat us to lung cancer. -Haze    haze is caused by the smoke when forests is burnt. -Acid rain    When smokes is released into the airthey contain gases which dissolves in the rainwater. Water pollution Water pollution occurs when subtances is released into the water. Causes of water pollution -Harmful chemicals from factories nd farms    Chemical that is wasted from the factories is realeased to the water.    Pesticides and fertilisers from farms are released in to water. -Rubbish    Rubbish is dump in to the water and cause the water to be dirty. -Human waste    Some people do not have proper places to get rid of their wates so they dump it in rivers and seas. -Oil spills    Oil are harmful when it leaks from ships and could cause an oil spill. Effects of water pollution -Harms organisms in water    Rubbish and chemical waste contains harmful subtances which could kill the organisms in water. -Harms human    Polluted water is unsafe to drink. Soil pollution Soil pollution occurs when subtances are released into the soil. Causes of soil pollution -Rubbish    When rubbish is dumped on land,the soil is pollutedand they seep into the soil. -Harmful chemicals from farms    Excessive in farms can pollute the soil. Effects of soil pollution -Air pollution    When rubbish can't be brokened down it releases harmful gases into the Air. -Water pollution    The waste of the soil pollution can go to water. -Deterioration of soil condition    Pesticides can kill living things living underground. -Growth of germs and pests    As the number of rubbish grew bigger,the bacterias are growing rapidly.

The science fair

The science fair is fun .There are a lot of games.The tug of war is very fun. We had a lot of fun.

making the pyramid

making the poster of the pyramid

making of the miniature tutankhamen

pouring water

materials

materials

desalination

burning of paper-chemical change

burning candle-chemical change