9th grade biology

1. There are 5 main substances that are needed by humans. they are carbohydrates, protein, fats, vitamins and dietary fibre.
2. Carbohydrates are organic compound that provide us with energy.
3. there are 3 kinds of carbohydrates, they are monosaccaharides, dissacharides and polysaccharides.
4. Proteins are very complex organic substances that help us to grow.
5. Kwashiorkor is one of desease that is caused by lacking of protein.
6. Fats are used to provide a source and storage of energy, protect organs from physical.injuries.
7. Water has the function to be solvent for inorganic and organic compounds.
8. there are 4 main digestive process. they are mechanical digestion, chemical digestion, absorption and assimilation.
9. inflammation, polyneuritis, and formation of ulcers are some effects of consuming excessive alcohol.

9th grade physics

1. pressure is force per unit area.
2. a rectangular wooden block measuring 0.250 m x 0.125 m x 0.840 m is resting on a table top. it has mass of 15 kg. calculate the greatest pressure and least pressure!
3. great pressure can be overcome by sharing the pressure to large area.
4. work is force per distance of an object.
5. Please give examples of work.
6.energy can only be changed, it can not be created or destroyed.
7. Energy is the capability to do work
8. there are several kinds of energy, they are chemical, potential, elastic and kinetic energy.
9. Power is the rate of work done
10. Brownian law states that all particles move in random and constant motion

chemistry final test (9th grade)

Please study from text book pages 121,122,123,141,142. please memorize the way to finish the questions.