Pruebas del III Parcial

Prueba 1

Septimo A y B

Jueves 5 de Febrero

Contenido

Capitulos 11, 12 y 13.

paginas: 200-242. S86-S93

Study Guide

1. What is matter? Anything that has mass and occupies space.

2. How can matter be identified? By its properties.

3. List the three properties of matter: Chemical, physical, and biological.

4. What are biological properties? Characteristics of matter that are unique to living things. example: growth, reproduction, etc.

5. What are chemical properties? property that describes how that kind of matter interacts with other kinds of matter. Describe a situation in which the identity of matter is changed. Example. burning paper, eggshell dissolving in vinegar, and turning brown (apple) when exposed to air).

6. What are physical properties? property of matter that can be observed by your senses without altering the composition of the matter. Example: rearing a piece of paper.

7. Explain the two ways physical properties can be.

-Describing the matter itself, like shape, color, etc.

-Describing how the matter changes like sugar dissolved in water.

8. What is molecule? The smallest particle of a substance, that is still identifiable as that substance.

9. How are the properties useful? The properties of a material determine its use.

10. SI: Systeme Internationall d' Unites. Based on multiples of 10. Practice conversions.

11. What is volume? The amount of space occupied by matter. The amount of space inside a hollow object.

12. What is the displacement method? A method that measures the volume of an object by measuring the amount of liquid that it displaces in a container.

13. What is density? The mass of a material per unit of volume.

14. What is Mass? A measure of the amount of matter in an object (amount of matter a substance contain: mass is constant).

15. What is weight? Is the downward force exerted by an object due to gravity. the weight i no constant because gravity change according the location. The weight is the mass multiplied by gravity.

16. List the unit of measuring mass and weight. Mass: kilograms and gram. Weight: Newtons.

18. List the four states of matter: Liquid, Solid, Gas, and Plasma.

19. Describe how the molecules interact in each state of matter:

Liquid: Molecules can change position and move past each other. Molecules move about freely, but they are held close together by attractive forces.

Solid: Molecules are close together in a fixed pattern. Strong attractive forces lock the molecules in a place.

Gas: Molecules are spread far apart. Molecules move about randomly with large spaces between them.

Plasma: Molecules have been broken down into electrically changed particles.

20. Mention the six changes of state:

Solid to liquid: Melting or liquefaction.

Liquid to solid: Solidification, or freezing.

Liquid to gas: Vaporization and evaporation or boiling

gas to liquid: Condensation and liquefaction

solid to gas : Sublimation or vaporization

gas to solid : solidification or crystallization

All mater, gases, liquids, and solids have volume. True.

The mass of the Earth is 6 sextillion ton. ( 6,000,000,000,000,000,000,000). True.

Ligtht year is the distance that light travel on one year, which is 9.46 billion of km. True.

Light travel 300.000km/sec. True.

The gravitational force exerted on the moon is one sixth that exerted by the Earth. True.

A change of state is a physical change. True.

Pruebas del III Parcial

TEST 7

Octavo A y B : Lunes 2 de Febrero.

Contenido (Lessons)
-10-1 Forces at Work.
-10-2 Different Kinds of Forces.
-10-3 What Makes Things Fall?
-11-1 The Tools to Use.
-11-2 Estimating the Size of a Force.
(paginas: 217- 240, y S75-S77, S84-S86 )

Study Guide

1. What is force? A push or pull exerted by one object on another. In exerting a force there is an AGENT that exerts a push or pull and a RECEIVER.

2. Name the effects that forces have on objects: Change the shape of an object, give motion to an object at rest, and alter the speed or direction of an object in motion.

3. What is motion? A change in position of an object when compared wiht a reference point.

4. What is the differenc between velocity and speed? Speed simply refers to how fast an object is moving, velocity refers the speed and direction of the moving object.

5. What is acceleration? A change in the speed or direction of motion.

6. Name some types of forces: buoyand, magnetic, electrical, gravitational, elastic, and frictional.

7. What are non contact forces? are forces exerted by an agent that does NOT touch the receiver.

8 What are contact forces? are forces exerted by an agent that does touch the receviver.

9. Which forces are contact forces? Buoyant, elastic, and frictional forces are contact forces.

10. Which forces are non contact forces? Magnetic, electrical, and grivitational forces are noncontact forces.

11. List the agent, receiver and effect.

Example: Magnet and paper clips: the agent is the magnet, the receiver is the pile of paper clips and the effect is the magnet attracting the paper clips.

-Piece of paper falling down.

-Hand pushing a book.

- When you loss your balance.

12. List 5 examples of buoyant, gravitational ,electrical, magnetic, frictional, and elastic forces. In each case identify the agent and the receiver of the force and state the force's effect.

13. How is the motion of an object described? By comparing it with a reference point, which is an object that is considered stationary.

14. How is speed determined? By dividing the distance traveled from a reference point by the amount of time it takes to conver that distance. Practice the exercises.

15.What is friction? Is a force that opposes motion.

16. How is motion of an object determined? By all the forces that act on it.

17. Every object in the universe exerts an gravitational force on every other object. True

18. The size of a gravitational force depends on the masses of the objects involved and the distance between them. True.

19. The weight of an object changes with its location in the universe, but hte mass of an object remain constant. True.

20. What is gravitational force? a force that is dependent on mass, and causes objects to move toward each other.

21. What is mass? The amount of matter present in an object.

22. What is weight? The gravitational force exerted on an object.

23. Every object remains at rest or moves with a constant speed in a straight line unless acted on by some unbalanced force. True.

24. Force is equals to mass by acceleration, force and acceleration are proportional. True.

25 For every action there is an equal and opposite reaction. True.

26. What is Inertia? The resistance of a mass to any change in its motion.

FINAL GRADES II PARTIAL

Class average 73%

Class average 64%

Partial Exam Study Guide 8th

Definition of:
Desalination, Distillation, Solution, Mixture, Suspension, Concentration, Dilute solution, Concentrated solution, Saturation, Atmosphere, Ocean, Buoyancy, Saliva, Tears, Blood, Acids, Bases, Perspiration, pH, Salts, Colloids ( include the three kinds). Melting point, Boiling point, Freezing point, Solubility.

Describe:
Steps for Making Honey. -Composition of the Atmosphere. - Composition of the Ocean. -Composition of Blood. -Composition of Saliva. -Composition of Tears. -Uses of Acids. -Uses of Bases. -Uses of Salts

Answer:
How can we raise the boiling point of a substance?. _How can we compare the concentration of solution? (3 ways).._How much saliva you produce in one day?._ How can you increase the solubility of one substance?._ What is an emulsion? Aerosols?._ Do all bases and acids present the same strength?