VERY SHORT ANSWER QUESTIONS 1.Give one example each of homogeneous and heterogeneous mixture. 2. How can we check whether the given soli substance is pure or not? 3. A hard substance produces a tinkling sound when beat. Is it metal or a non- metal? 4. Is brass a mixture or a compound? 5. What type of solution is an alloy? Liquid solution or solid solution 6.Give one example of solid- liquid homogeneous mixture.
Answers
Answer:
1) Homogenous: Salt water
Heterogeneous: Oil and water
2) If the substance has constant and even composition, and slightly higher melting point then it is a pure substance.
in case of water, it can be determined by passing electricity through it
3) metal
4) mixture (of copper and zinc)
5) alloy is a substance made by mixing a metal and a non metal or two metals
6) ice cubes in a drink
1. Examples of Homogenous mixtures —
Air, Saline solution, most alloys and bitumen.
Examples of Heterogeneous mixtures —
Sand, oil and water and chicken noodle soup.
2. To determine if a substance is pure in school laboratories, we can check the substance melting or boiling or use chromatography ( see Separation techniques). A pure solid has a constant / fixed melting point. i.e. it will melt completely at one temperature only.
3. It is metal as metal have the sonorous property. The property by which a metal produces a ringing sound when stuck hard is called sonorous property.
4. Brass is a mixture of the elements of copper and zinc. Bronze is a mixture of copper and tin. Water is a compound of the elements hydrogen and oxygen.
5. An alloy is a solid solution, as it contains two metals abd metals are solid too.
6. Ice cubes in a drink, sand an water and soil and oil.