the chapter 2"Is Matter Around Us Pure?"
Fill in the Blanks
1) A pure substance consists of a _______ type of particle.
2) A solution is a _____ mixture of two or more substances.
3) The component of a solution present in a larger amount is called the______.
4) The scattering of a beam of light by colloidal particles is called the ____
5) Brass is a mixture of approximately 30%______ and 70%_____.
6) A chemical change is also known as a ______.
7) ______ are mixture of two or more metals or a metal and non-metal.
8) The amount of solute present in a saturated solution at a given temperature is called its ______.
9) Elements can be normally divided into metals, non-metals and ____.
10) The constituents of a mixture can be separated by_____ methods.
VERY SHORT QUESTION.
1) What is a solution?
2) What are alloys?
3) What is the Tyndall effect?
4) What is the difference between a solute and a solvent?
5) What is a chemical change also called?
6) What is a chemical change also called?
7) What are the two main constituents of air?
8) Name two element that are liquid at room temperature.
SHORT QUESTION
1) Define a pure substance from a scientific perspective. How does this differ from the common understanding of "pure"?
2) Explain the difference between homogeneous and heterogeneous mixture with two example for each.
3) What are the properties of a suspension?
4) How can you confirm that a colorless liquid is pure water?
5) List two difference between a mixture and a compound.
6) Describe the properties of metals.
7) How does the solubility of a salt change with a change in temperature?
LONG QUESTION.
1) Explain the process of creating a saturated solution and an unsaturated solution. what is solubility? What would you observe if you cooled a saturated solution slowly?
2) Describe the properties of a colloidal solution. How does it differ from a true solution and a suspension in terms of particle size, visibility, stability, and the Tyndall effect?
3) Differentiate between physical and chemical changes. Provide a detailed explanation with examples, including the case of a burning candle where both types of change occur.
4) Explain the different ways to express the concentration of a solution. Use the mass by mass percentage formula to solve the following problem: A solution contains 40g of common salt in 320g of water. Calculate the concentration.
5) Classify the following into elements, compounds, and mixtures: Sodium, Soil, Sugar solution, Silver, Calcium carbonate, Tin, Silicon, Coal, Air, Soap, Methane, Carbon dioxide, Blood. Justify your classification for each item.
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