Q.2:What is meant by?

1- The dot product of two vectors A and B = 75.2.

 2- The vector product of two vectors A and B = 43.6 n.

Q.1:Define:

1. Measurement.                                        2- Fundamental physical quantities.

3. Derived physical quantities.                 4- Standard meter.

5- Standard kilogram.                                  6- Standard second.

7- Dimensional formula.                              8- Absolute error.

9- Relative error.                                           10- Scalar quantities.

11- Vector quantities.                                    12- Distance.

13- Displacement.                                        14- Resultant force

2. Mention one harm of nano technology in the following fields:

   1. Medical: nano particles have a negative effects on organs.

   2. Environmental: Pollution of water and air by nano particles.

   3. Social: un even distribution of resources.

2. Mention one application of nanotechnology in the following fields:

   1. Medical: Early diagnosing of diseases.

   2. Agricultural: Production of pesticides.

   3. Energy: Production of nano silicon and hydrogen fuel cells.

   4. Industerial: Production of nano wrapping substance.

   5. Communication: Production of wirless nano devices.

   6. Environmental: Production of nano filter for purifying air air and water.

5) a- What is the importance of measurement in chemistry:

1. Gaining information.

2. Monitoring and protection.

3. Evaluation and suggestion.

3. Write the scientific term:

1. An organized structure of knowledge includes facts, concepts, principle and theories. (Science)

2. The chemical substance with healing properties. ( medicines)

3. Deals with the treatment of matter on the nano scale.( nano technology)

4. Deals with the chemical applications of the nano substances.( nano chemistry)

5. Equals one of a billion of meter. ( nano meter)

6. Substances in which one or more of their dimension is between(  1– 100nm).       ( nano substance)

7. The volume of the substance in which the nano properties appears.      (critical nano volume)

8. The properties of the substance that depend on the nano volume of the substance. ( volume dependent properties)

9. A place at which the chemical experiments are carried out.   (chemistry laboratory)

10. The comparison of an known quantity with a known one.  ( measurement)

3. Choose from column (B) What suits column (A):

2) Give reason:

1. Measurement has a great importance in chemistry

- Bec.it provide us with necessary information and quantitative data.

2. Chemistry is considered the center of most other sciences.

- Bec.it integrates with other branches of science.

3. Nano meter is an unusual measuring unit.

- Because extraordinary properties of the substance appear on this Scale.

4. Bucky ball (C₆₀) is used as a medicine carrier.

- Bec.it is a Hollow ball with an outer part resists the reaction inside the body

51. Nano tubes can be used to make space elevator.

- Bec. they are lighter and stronger than steel.