EASY
Earn 100

Define mixture. What are the types of mixture?

Important Questions on Is Matter around Us Pure?

EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Who gave the definition of an element?
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Example of an element among the following is
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

Consider the elements of group-14. Choose the correct alternative:

a) Si and Ge are semiconductors

b) Carbon and silicon are non-metals

c) Sn and Pb are metals

d) Si and Ge are metalloids

HARD
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
A mixture of sulphur and carbon disulphide is:
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Give two characteristics of a chemical compound. 
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Distinguish between a compound and a mixture.
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

How many total elements are there?

EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

Name the element which is most abundant in the earth's crust.

EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
_____ is a metal which is liquid at room temperature. (Bromine/ Mercury)
HARD
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

Hydrogen is the most abundant element in the earth’s crust.

HARD
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Two substances X and Y react to form a new substance X2Y according to the following equation:
2X + Y → X2Y
Which of the following are incorrect?
i. The product formed is an element.
ii. The product cannot be classified as a compound.
iii. The product will always have a fixed composition.
iv. X2Y exhibits the properties of both A and B.
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
The elements which behave like metals and non-metals are called _____. (transition metals / semi-metals)
HARD
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Classify the following into elements, compounds and mixtures: water, seawater, dry ice, petrol, sugar, silver, brass, steel.
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Identify the elements from the following:
a. sugar 
b. steam 
c. neon 
d. chromium 
e. molybdenum 
f. coal.
 
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Benzene is a compound and it contains carbon and hydrogen.
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Classify the following into elements, compounds and mixtures: 
water, sea water, dry ice, petrol, sugar, silver, brass, steel. 
 
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

Explain the terms:

a.compound

b.colloid.

EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
A pure substance which contains two different kinds of atoms is called _____.
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances
Element is the simplest form of matter.
EASY
Science>Chemistry>Is Matter around Us Pure?>Types of Pure Substances

Pick out the odd-one from the following:

Steam, diamond, silver, nitrogen.