Science - Guía de Preguntas .

Final Exam Practice

1)    Plan a fair test to find out whether or not the following objects float in salty water (the volume of the sample: 1500 cm3- Mass: 1700 g.)

  

a) A football, which has got a volume of 570 cm3 and a mass of 400 g.

b) A rectangular prism, which has got a length of 75 cm, a width of 37 cm, a height of 23 cm and a mass of 70 kg.

Mention the steps to take and the instruments that you will use to do this.

2)    Describe the particles inside this glass according to movement and arrangement, saying what state of matter they are. Then, compare them to the particles which compose the glass. What is the difference between them? Remember that glass is a solid made up mostly of sand (silicon dioxide).

3)    Describe how the following temperatures will affect the particles of water and glass in each case, and explain WHY these temperatures will have these effects.

A)    Water is exposed to 150 degrees Celsius.

B)    Glass is exposed to -40 degrees Celsius.

4)    Why is it that you can drink water but cannot drink ice? (SEE PAGE 34 – SCIENCE BOOK)

5)    Why is the glass solid and not liquid or gaseous?

6)    Explain why gases can change volume? (Think of their particles)

7)    (AIR PRESSURE) At sea level, you grab a balloon and fill it up with air from your lungs. Then, you take it into a mine chamber, located a few kilometers underground. Think about the situation and answer these questions:

a)    What produces air pressure inside and outside the balloon?

b)    What do you think that will happen to the balloon as you go deeper and deeper? Why?

c)     What would happen to the balloon´s volume if you started sucking the air out of the mine chamber?