How to learn naming Chemical Formulae?

Chemicals
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Nomenclature of Simple Inorganic compounds.

1. A formula is a shorthand notation used to identify the composition of a molecule or compound.

2. For example chemical formula of water is H₂O. It includes the symbol of each element (e.g. Hydrogen:H and Oxygen:O)  in the molecule, along with numerical subscripts to show how many atoms of each element are present.

3. Most of the inorganic compounds are binary compounds i.e. it consists of two elements. Some are ternary i.e. contain more than two elements.

CBSE Class 10 - Science - SA1 Paper

Class 10 - Science - SA1 - Paper (2010)

NTSE SAT Quiz-13 (Maths) / Class 8 Maths

NTSE SAT Quiz-13 (Maths)

Q1: One third of a number is greater then one fourth of its successor by 1, find the number.

(a) 5
(b) 15
(c) 20
(d) 25

Class 11 - Physics - CH3 - Motion In a Straight Line (Part-2)

Motion in straight line!
(source:clker.com)

NCERT Chapter Solutions (Q14-onwards)

For Questions (1-13) see page.

Q 3.14: A man walks on a straight road from his home to a market 2.5 km away with a speed of

5 km/hr. Finding the market closed, he instantly turns and walks back home with a speed of

7.5 km /hr. What is the

(a) magnitude of average velocity, and

(b) average speed of the man

over the interval of time

(i) 0 to 30 min,

(ii) 0 to 50 min,

(iii) 0 to 40 min ?

[Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero !]

Answer:

Class IX- English(Comm.) - INTEGRATIVE GRAMMAR PRACTICE 2

INTEGRATIVE GRAMMAR PRACTICE 2

1. Look at the notes given below and complete the paragraph that follows by choosing the correct options from the choices given below. Write the correct options in your answer sheet against the correct blank numbers.

Kalakshetra - cultural academy - preserves - Indian art - founded in 1936 - internationally recognized Indian Parliament Act - institution of national Importance.

Kalakshetra is a cultural academy dedicated to (a)_______________ especially Bharathanatyam. The academy (b) ___________________ Arundale and under her guidance the institution achieved (c) ______________ for its unique style and perfection. In 1993 an (d) _____________ recognized the Kalakshetra foundation as an institution of national importance.

Answer:

Class 9 - Maths - Coodinate Geometry

Coordinate Geometry - Important Points

1. Each point on a number line is associated with a number called its coordinate.

2. Each point on a plane is associated with an ordered pair (x,y) of numbers called its coordinates.

NTSE (Science) Quiz-12/Science & Technology Objective Test (Haryana Board)

Science & Technology Objective Test (Haryana Board)/ 

NTSE Sample Quiz-12 (Science) /Class 8 Science

Q1. Atomic number of sodium is 11 and number of neutrons is 12, then atomic mass will be
(a) 12
(b) 22
(c) 11
(d) 23


Q2: Which original particle of atom contains negative charge?
(a) On nucleus
(b) On proton
(c) On neutron
(d) On electron

Class 6 - Science - CH4 - Sorting Materials into Groups

NCERT Chapter Answers and  other Q & Answers

Ever wonder how mails are sorted and posted. Watch this video (source: you tube)

Q1: Name five objects which can be made from wood.

Answer:

1. Chair
2. Table
3. Plough, 
4. Bullock cart and its wheels
5. Door

Unit 3: Future Time Reference (CBSE Class 9 English Comm. Workbook)

2. Look at sentences in Column A. Match them with the appropriate explanation in Column B.

A	B
1. Next Friday is the 29th of May.	a. emphasizing that something will happen very soon
2. I'll have left by the time you get here.	b. making a promise
3. I'm visiting my uncle on Sunday.	c. predicting that something will be true at a given time in the future
4. I'll send the photographs as soon as I can.	d. stating something which is a certainty
5. The lesson is about to start… hurry!	e. reporting a decision made earlier
6. The population of our country will increase in the next ten years.	f. making a prediction about future events.

Answer: 1-d, 2-c, 3-e, 4-b, 5-a, 6-f

Class 9 - Unit ObjectiveTest - Science - The Matter in Our Surroundings

Objective Test 

Q1: Fill in the blanks

a. The process of ________ causes cooling.
b. The process of cooling glass is known as ____.
c. Liquids have no fixed ______ but have fixed _____.
d. ____ exists in all three states of matter.
e. Carbon dioxide is a white solid called _____ at temperature below ______.