GRADES III PARTIAL

8A: 22 pts accumulated

8B: 24 pts accumulated

T: test; H: Homework

T: Test; L: Lab reports.

Test 8 Sciences 7th

Monday, February 23

Study Guide.

T or F. All the following statements are True.

No two objects can occupy the same space at the same time.

Weight is measured in Newtons

The gram is the base unit for measuring mass. The liter for measuring volume.

A change of state is a physical change.

Boiling point is the temperature at which a liquid rapidly becomes a vapor (gas).

Melting point is the temperature at which a solid changes to a liquid.

Freezing point is the temperature at which a liquid changes to a solid.

Condensation is when a gas becomes liquid.

Chemical are uniform substances with predictable properties.

Each chemical has certain chemical and physical properties that distinguish it from other chemicals.

Bubbles, heat, light, and color changes may indicate a chemical change. Chemical change are not easily reversed.

Chemical change form new substances, but physical changes do not.

Examples of physical changes are: breaking, dissolving, boiling, evaporating, or freezing.

Atoms, the basic units of all the elements, are not the smallest form of matter.

Answer.

1. What is matter? S86

2. What is molecule? S87

3. What is mass? S90

4. What is weight? S90

5. Compare and contrast mass and weight (at least 2 differences and 1 similitude)

6. What is density? S92.

7. List the four statement of the atomic theory. S100

8. What is an atom? S100

9. What is electron? S101

10.What is a proton? S102

11. What is a neutron? S102.

12. Answer the five questions of Checking Your Understanding on p S105.

13. State the temperatures at which oxygen, aluminum, water and hydrogen would be liquid and gas. p242.

Exercises. (show all work)

1. Find the weight of your parents (both) and siblings (all).

2. A block of pine wood has a mass of 120 g and a volume of 300 ml. what is the density of the wood?

3. Find the density of the objects measured in Lab 7: "Mass and Volume". Lemon, baseball ball, rock, and egg. which objects would you expect to float on water, why?.

Solve the study guide on your notebook. Write question and answer of print the study guide and paste it in the notebook.

TEST 8 SCIENCES

Monday, February 16

8th A y B

Study Guide

ANSWER:

1. What is gravitational force (gravity)?

2. What is weight?

3. What is mass? how do they differ (mass and weight)?

4. Describe the first two laws of Isaac Newton that describe motion and its related forces.

5. Describe the Gravitational Theory.

6. What is Friction (frictional force)? List 3 examples of friction (name the surfaces involved)

7. List three ways we can reduce friction.

8. List three harms of friction.

9. What is inertia?

10. Relationship between inertia and mass.

T or F

1. A large mass exerts a stronger pull than does a smaller mass at the same distance. True (gravitational attraction depends on their masses and the distance between them (objects)).

2. Objects with different masses accelerate downward at the same rate. True. (more force is needed to accelerate a larger mass, and because of its greater mass, the pull of gravity acting on the larger mass is greater than the pull of gravity acting on the small mass).

3. Acceleration and force are directly proportional, as force increases, acceleration increases. True.

4. Inertia is not a force, is a quality of an object that causes it to resist any change in its state of rest or motion. True.

5. Friction occurs when surfaces rub against each other. True.

6. Friction is greater when motion is starting than when it is continuing. True.

7. Friction is greater for heavier weight. True.

8. The greater the mass, the greater the inertia, that is the greater the tendency of an object to remain as it is and the greater the force needed to alter the object's state. True

Practice

1. Find the Force (weight) of an object if its mass is 220 Lbs.

2. Find the acceleration of a 75 kg skater that pushes off from a wall with a force of 200 N.

3. Fin the mass of an object with a force of 15 N.

4. Find the weight of your parents and siblings on Earth.

5. Find the weight of your parents and siblings on Mars and Moon.

Exposiciones 8vo A y B

Exposicion:
Realizar conecciones de la arquitectura unica con el periodo de la historia y la tecnologia disponible. Incluya los conceptos utilizados en la Unidad 5 : Structures and Design.
Uso de Poster (individual) . El poster debe incluir figuras, fotos o diagramas grandes. Utilizar letra grande evitando textos largo.
Presentaciones basadas en la lectura del Poster seran evaluadas con nota minima.
Debe conocer la pronunciacion correcta de las palabras a usar y exponer de una manera clara y simple.
Valor: Poster 5 pts; Manejo del contenido 5 pts; Respuesta y Formulacion de Preguntas: 5 pts.
Fecha: Febrero 20-22.