Questions for crystallization of milk

 Procedure

1. prepare a liter of milk, topping, cups, spoon, box, ice, salt, bag

2. put ice in box
3. put milk in bag
4. push ice in box
5. Shake milk in box
6. when milk was frozen put topping in bag and shake again
7. bring bag come out
8. Can eat it

Questions

1)  why do we add salt to the ice?

-  It will lower the freezing temperature of the water and salt make exotherm.

2)   why do we add the cookies and other things, only after the milk has frozen slightly

- Cookie won't mix milk if we put it after it frozen.

3)  what are two factors that affect the freezing you think?

- Ice & salt

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

- If there is much air inside it may pop the bag when shaking

Resource : 

Lab rock 

                        `

                       

1. the density of each of each of your mineral samples. How could you use the densities to identify the minerals

1. You can identify a mineral by its appearance and other properties.2. The color and luster describe the appearance of a mineral, and streak describes the color of the powdered mineral. 3. A mineral has a characteristic density.4. Mohs hardness scale is used to compare the hardness of minerals.

2. Would density or color be more useful in identifying a particular mineral? Explain your answer. 

I think both of it are useful but density is more useful. The reason is it is more accurate because it used the same ratio even if how big or how heavy it is and one mineral can be more than one color.

The impact of society on environment

1. environmental pollution resulted in increase of temperature of atmosphere which resulted in global warming.

2. Green house resulted in increases the global temperature and global warming because in earth have a lot of Chlorofluoro carbons carbon dioxide, Methane and Nitrous oxide  

3. Acid rain resulted lives of plants and animals, damages stone statues and buildings. It reduces productivity of crops, forests and grasslands. It causes skin and respiratory diseases in man. Due to acid rain leaves of plants turns yellow and brown.

Individual Project

 What is clouds?

Types of clouds?

Cumulus 

Cirrus

Stratus

Nimbus

My video

By Mon Bright Deer

Highlight in PHS

  In first year at Panyarathighschool, I get many good in knowledge such as adaptation, feeding relationship variation, classification, atmosphere and speed.

  I did made many lab, I like the most is fish and shrimp lab because I did feed fish and shrimp. It is best for study fact. 

  In next year, I will hope good think in add science.

Classifying Clouds

   

Stratus

Sheets of low, grey clouds that bring light snow or rain.

Cirrus

Thin, feather like clouds made of ice crystals high in the atmosphere.

Usually means a change in the weather is coming.

Cumulus

White and fluffy clouds that usually mean good weather.

The Effect of Gravity on Speed

Introduction

Gravity provides a constant acceleration (force) on an object.  The effect is changed by using ramps at different angles. In this lab, you will find the optimal angle to maximize acceleration on a ball bearing so it travels the farthest and/or the fastest.  Friction is the opposing force created by the surface interactions.  Whenever something rolls due to a force, friction will oppose this force and slow it down.

Equipment needed:

Timer                                       Ramp                           Ball Bearing

Graph Paper (2)                       Ruler                                      

Procedure:

1.         Put the ramp against the seat of a chair.  Place the ramp and chair so that the ramp points towards the hallway.  Have your teammate on the other end of the hallway. 

2.         Place the ball bearing at the top of the ramp.

3.         Lift the ramp 20 cm and release the ball bearing

4.         Time how long it takes to travel  5 meters.

5.         See how far it will go..

6.         Repeat the experiment three times for each height then do 40 cm, 60 cm, and 80 cm.

Height	Time to travel 5 meters	Distance travelled
20	2.98 s	5 m
40	3.66 s	5 m
60	8 s	5 m
80	6 s	44 cm

Observations:

 When the height is high, the time is short, the height is low the time is long.

Analysis

1.         Describe how the ball rolls off the ramp at each height—discuss the effect of bouncing or other factors.

           

 When the height is high the ball will bounce and the distance also shorter than the ball that doesn't bounce.

2.         Discuss what is the fastest speed reached and any factors that could improve this.

         2.98 s

3.         Does the ball travel in a straight line, why or why not?

         No, because it is circle so it can go anyway.