Class IXth Science Test From Chapter 2 – Is Matter Around Us Pure
M.M: 79 marks Date: 02/09/2011
Time: 1 hour 30 minutes
Q 1: Fill in the blanks with the correct answer (1 mark per answer x 35 = 35 marks)
- An ______ is a form of matter that cannot be broken down by chemical reactions into simpler substances.
- A _________ is a substance composed of two or more different types of elements, chemically combined in a fixed proportion.
- A _______ contains more than one substance (element and/or compound) mixed in any proportion.
- Symbol of Boron is _______, Silicon is _________ and Germanium is __________.
- ________ number of elements are naturally occurring and the rest are ________________.
- Two elements that are liquid at room temperature are _______ and ________.
- Elements ________ and _________ become liquid at slightly above room temperature.
- ________ _______ was the first scientist to use the term element in 1661.
- _____ _______ ________ (1743 – 94), a French chemist was the first to establish an experimentally useful definition of an element.
- Although, ice, water and water vapour, all look different and display different ______________ properties, they are ______________ the same.
- Burning is a ____________ change.
- A chemical change is also called a ________ __________
- Melting of wax is a ________ change while burning of wax is a ________ change.
- The crystallisation method is used to _______ solids.
- The boiling point in 0 Celsius of oxygen is _________, argon is _______ and nitrogen is ________
- % Air by volume for oxygen is ______, for argon is ______ and for nitrogen is _________
- Two examples of solids that sublime are _______ and _______________
- The ink used by used by us has water as the _______ and the dye as a __________ in it.
- Usually, a dye is a _______ of two or more colours.
- ______ in Greek means colour.
- _________ technique was first used for separation of colours.
- Two examples of gel are ______ and ________.
- Two examples of liquids dispersed in gas as aerosols are ______ and __________.
- Two examples of solid sols are __________ and __________.
- The components of a colloidal solution are the _________ _______ and the _________ _____________.
- ________ effect can be observed when sunlight passes through the canopy of dense forest.
- Aerated drinks like soda water etc. contain _______ gas as ________ and __________ as solvent.
- Air is a _______ of gas in gas.
- 1 nm = ________ metre.
- Tincture of iodine has _______ as the solute and ________ as the solvent.
- Milk is a mixture of ______, ______, _______ etc.
- A pure substance consists of a _______ type of particles.
- Dissolved sodium chloride can be separated from water by the _______ process of __________.
- ________ are the elements having intermediate property between those of metals and non-metals.
- Brass is a mixture of ________ zinc and ________ copper.
Q 2: Define mixture. How many types of mixtures are there? Write one difference between them. Also give two examples of each.
(5 marks)
Q 3: Define solution. Give two examples of same. (2 marks)
Q 4: What do you understand by an alloy? (1 mark)
Q 5: What are the components of a solution? Define them. (3 marks)
Q 6: Write two differences between a solution and a suspension. (2 marks)
Q 7: Write two properties of colloids. Give two examples of colloids. (3 marks)
Q 8: Which method can be used to obtain dye – coloured component from blue/black ink? (only write the name) (1 mark)
Q 9: Which device can be used to separate cream from milk?
(1 mark)
(1 mark)
Q 10: What is the principle of centrifugation? (1 mark)
Q 11: With the help of an experimental setup, explain how will you separate acetone from water? (3 marks)
Q 12: What is chromatography? Write its two applications.
(3 marks)
(3 marks)
Q 13: Write the name of process that can be used to separate a mixture of ammonium chloride and salt. (1 mark)
Q 14: Draw a diagram only to show how will you separate petrol from water? (2 marks)
Q 15: Write one difference between distillation and fractional distillation. Also write one example of substances that can be separated by each process. (2 marks)
Q 16: How is liquid air obtained? Write in brief. (1 mark)
Q 17: Write the steps for obtaining pure copper sulphate from an impure sample. Also name the process involved. (3 marks)
Q 18: Show a diagram of water purification system in water works. (2 marks)
Q 19: Classify the given changes as physical or chemical changes: (3 marks)
- Making of fruit salad with raw fruits
- Cutting of wood from trees
- Photosynthesis
- Cooling of water to form ice
- Breaking of a toy made of clay
- Cooking of food
Q 20: Write two differences between a mixture and a compound. (2 marks)
Q 21: Give two examples each of metals, non-metals and metalloids. (3 marks)
