The National Evangelical
School in Nabatieh
Name :
Grade : 7
Date :
Section : ( A,B ,C&D)
Teacher : Fatima Halawani
Subject : Chemistry
Exercise 1 : True or false
Answer by true or false and correct the false statements.
a- Two non-miscible liquids form a homogenous mixture.
b- Simple distillation consists of a condensation followed by a vaporization.
c- The water obtained by simple distillation of salty water is called : distilled water .
d- The liquid that passes through the filter paper is called residue.
e- A mixture of oil and water can be separated by filtration .
f- The separatory funnel is used to separate two miscible liquids.
Exercise 2:
Separation
techniques
Name of technique
Type of mixture
Example of mixture
1- Copy and complete the above table.
2- Indicate the physical property the technique(A) depends on.
(A)
(B)
Exercise 3 :
Part A
A student went to the chemistry lab of his school and measured the density of three
immiscible liquids : Vinegar , mercury and oil. He tabulated the results in the adjacent
table.
1- Specify the type of this mixture. Which mixture ??
2- The three liquids formed three layers (X) , (Y) and (Z) as shown in the adjacent
figure .
Give the name of each layer.
i- Layer (x):
ii- Layer(Y):
iii- Layer(z):
3- The student used the adjacent set up to separate the contents of the above beaker.
He poured the three liquids in glassware (A). doc-1
a- Give the name of glassware (A).
b- Name and define the corresponding
separation technique.
c- Justify the following statement :
Can we use
the above technique can not be used to
separate a mixture of water and alcohol
Justify your answer.
Part (B)
Consider a beaker containing a mixture (A) which is formed of sand , salt and water . we pour this
mixture into a conical flask beaker through a funnel fitted with a filter paper as shown in document
(1).
Referring to document (2):
1- Identify the type of mixture (A).
2- How many phases are formed. Specify them.
3- Name the separation technique shown
in the adjacent document.
4- Identify the residue and the filtrate.
Liquid
Density (g/cm3)
Vinegar
1.05
oil
0.8
mercury
13.6
Doc-2
Doc-1
1
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2
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