- •Mr. Ahmed mabrouk second term 2011
- •1(A Metal substitutes water hydrogen or acid:
- •2) The substitution of a metal instead of another one into its salt
- •1) Reaction between acid and Alkali. (Neutral)
- •2) The reaction of acid with salt
- •3 ) The Reaction of salt with salt
- •L esson 1 exercises
- •L esson 2: Speed of Chemical reactions
- •The definition of the speed of chemical reaction
- •The speed of chemical reaction:
- •Type of coherence in reactants
- •C atalysts have some common properties:
- •Biology
- •L esson 2 Exercise
- •Lesson 3: Solution
- •Solutions of acids, bases and minerals
- •Economic importance of some common acids
- •E conomic importance of some common bases
- •Economic importance of some common minerals
- •Lesson 3 Exercise
- •L esson 3 Exercise
- •Science, Technology and Society
- •A) Shinning metal
- •B) In the Kitchen
- •C) In the garden
- •D) In the medical field
- •Electromotive force ( emf )
- •T ypes of electric resistance:
- •The relationship between the current intensity and the potential difference (Ohm’s law):
- •Lesson 1 exercises
- •1 Complete the following sentences:
- •2 Choose the correct answer for each of the following statements:
- •3 Write the scientific term corresponding to each of the following statements:
Lesson 1 exercises
1 Complete the following sentences:
a The current following through a conductor is .....................proportional to .........................
b The unit ............... is used to measure the current intensity is known as …............
c ................. is measured by using the Voltmeter and has a measuring unit.......................
d The ...................... is used to measure the electromotive force of a battery in units known as .......................
e While connecting charged conductors, the electric current passes from the conductor have ....................... potential to the conductor have ....................... potential.
2 Choose the correct answer for each of the following statements:
a The ....................... is used to measure the electromotive force of a battery.
(Voltmeter – Ammeter – Reostat)
b The sliding Rheostat are used to change .................. and .............. in the electric circuit.
(The current intensity and potential difference – the resistance and potential difference – current intensity and resistance).
c The Ammeter is used to measure ....................... in the electric circuit.
(The potential difference – the current intensity – the resistance)
d The unit of measuring the electric resistance is .......................
(Ampere – Volt – Ohm)
e The unit of measuring the current intensity is .......................
(Ampere – Volt – Ohm)
3 Write the scientific term corresponding to each of the following statements:
a The obstruction the electric current during its flow in the conductor.
(----------------------------)
b The flow of electric negative charges in a conducting element (metal wire).
(----------------------------)
c The amount of electric charges that flow through a conductor in a certain time.
(----------------------------)
U nit 2 Lesson 1: The Physical Properties of the Electric Current
Electricity is a hidden energy that can not accurately describe yet, we identify it through its