Maths Fractions Decimals Algebric Expression class 7

Simplify

1.  2 z + u + 4, when z = 7 and u = 3	2.   x − z − 7, when x = 3 and z = 7
3.   5 + 4a, when a = 7	4.   7 q z2, when q = 10 and z = 4

Express each phrase as an algebraic expression.

1.   12 more than the quotient of 16 and a number j	2.   10 times the sum of a number q and 49
3.   2 less than the product of 3 and a number r	4.   2 increased by a number z
5.   a fourth of the difference of 38 and a number s	6.   31 multiplied by a number t

Q 22 In the adjoining figure, name the following pairs of angles:

   

(i)     Obtuse vertically opposite angles

(ii)    Adjacent complement angles

(iii)   Equal supplementary angles

(iv)   Unequal supplementary angles

(v)    Adjacent angles that do not form a linear pair.

Short Questions

1.     An angle is greater than 45 . Will its

complement be an angle greater than 45 or equal to 45  or less than 45 ?

2.     State true or false: If measure of an angle is 90° then its supplement angle will be greater than 90°.

3.     State true or false: Two acute angles form a linear pair.

4.     Fill in the blank : If two adjacent angles are complementary they form a ______

5.     How many litres are there in 755 ml ? 

6.     1/3 is the  reciprocal of ______. 

7.     Fill in the blank given below by any one of >, < or = 
 2.005 __ 2.05 

8.     Write an equivalent  fraction of .

9.     A player played 14 games. Out of which he won 8 games. Write the fraction of the games he won

10.                        ___has no reciprocal.

Answer the following

1.     Raghu has 175 sweets out of which he gives one fifth part part to his sister and out of the remaining he gives  two seventh part to his youngest brother. How many sweets are left with him.

2.      

3.

 

Chemical Bonding class 10

Chemical bonding

A.    Fill in the blanks

1.       The force which holds the two atoms together is called _____________

2.       Transfer of one or more electrons from one atom to other takes place to form ______________or ___________bonds

3.       A _____________covalent compounds shows some ionic character

4.       _____________has four electrons In valence shell.

5.       Elements with completely filled outer shells are called __________

6.       __________compounds  are soluble in water

7.       Negatively charged particles formed by gain of electrons are called_______

8.       Number of electrons present in outermost shell are called __________

9.       The bond formed by a shared pair of electrons with both electrons coming from the same atom.

10.   ____________compounds are hard crystals yet brittle

Short Answer type question

1.           Difference between polar and non polar molecules

2.           Why do most of elements forms ions

3.           What is a lone pair? Give two examples

4.           In the formation of the compound XY₂, an atom X gives one electron to each Y atom. What is the nature of bond in XY₂. Draw the orbit structure of this compound.

5.           The electronic configuration of chloride ion and argon atom is same then what is the difference between the two

6.           What type of bonds are usually formed between the metals and non metals and why?

7.           Elements X,Y and Z have at no 6,9 and 12. Which one will

a.     Form anion                 b) form a cation                  c) has four valence electrons

8.           Predict the type of bonding in

a.     Oxygen                         b. calcium oxide                  c. water

Answer the following

1.     Give reason for the following

a.     A molecule of methane has four single covalent bonds

b.     Sodium chloride has high melting and boiling point

c.      Why atoms loose or gain electrons

d.     Non-polar are soluble in organic solvents but insoluble in water.

2.     Explain with the help of electron dot structure

a.     Formation of water

b.     Formation of Ammonia

3.     Distinguish between Oxidation and Reduction

4.     Five atoms are labeled from A to E

Atoms                        Mass No                    Atomic No

A                                    40                                        20

B                                    19                                          9

C                                      7                                          3

D                                   16                                           8

E                                    14                                          7

         a) Which one of these atoms

                     i)contains 7 protons

                     ii) has an electronic configuration of 2,7

         b) Write down the formula of the compound formed between C and D

         c) Predic  which are i) metals      ii) non-metals

5.     An atom X has electronic configuration of 2,8,18,8,1

         a) predict the sign and charge on a simple ion of X

         b) write if X will be oxidizing agent or reducing agent

6.     What do you understand by redox reaction. Give one example

7.     Give structure of

         a) hydronium ion               b) Ammonium ion

8.     Match the following

                     Column A                                         Column B

1)    Sodium Chloride                                   increases

2)    Ammonium ion                                     Covalent bond

3)    Electronegativity across period           Ionic bond

4)    Carbon tetrachloride                            coordinate bond

5)    Non metallic character down               decreases

the group