Gas Laws and Staticelectricity Woeksheet class 9

                                                           Gas laws

1.  Moist nitrogen at a pressure of 700 mm Hg and temperature 27^oC is found to occupy a volume of 100 cm³. Find the volume of dry nitrogen gas at S.T.P.
(Aqueous tension at 27^oC is 15 mm Hg)

2.   A given mass of a gas occupies 960 ml at 27^oC. What volume will it occupy if the temperature is raised to 177^oC, pressure remaining constant.

3.  A gas occupies 200 cm³ at a temperature of 27^oC and 720 mm of Hg. Find its volume at 3^oC and 740 mm of Hg.

4. What is the pressure-volume relationship of a gas when temperature remains constant?

5. The volume occupied by a certain gas was found to be 5.6 dm³ at 2 atmospheric pressure. If the pressure is increased by 20%, find the new volume of the gas.

                                           

                                                 Static electricity

Question 1

During a thunderstorm the safest place in open is under the trees 

True

False

Question 2

When an ebonite rod is rubbed with a fur, the charge acquired by the rod is positive and by fur is negative.

False

True

 Question 3

The metal foil on the glass bottle of an electroscope is earthed when the electroscope is in use, in order to protect it from any external damage.

False

True

Question 4

The negative charge on a body is due to gain of electrons while the positive charge on the body is due to gain of protons.

False

True

Question 5

Sparking is caused due to flow of electrons through the air between the two non touching charged bodies when kept closer to each other. 

False

True

Question 6

The charge on an unevenly shaped body is uniformly distributed. 

True

False

carbon and its compounds

Question .1. (i) What is the special feature of the structure of : (a) C₂H₄ (b) C₂H₂.

(ii) What type of reaction is common to both these compounds?

(iii) Give the name and structural formula of (a) a saturated hydrocarbon, (b) an unsaturated hydrocarbon with a double bond.  

(iv) Copy and complete the following sentence: A saturated hydrocarbon will undergo _________ reactions whereas the typical reaction of an unsaturated hydrocarbon is _________. 

(v) State the term defined by the following :- Compounds containing carbon and hydrogen only.

(vi) State the general formula for a saturated hydrocarbon and give one example and structural formula of the same.

(vii) Draw the structural formula of ethyne. How does the structure of alkynes differ from that of alkenes.

(viii) Fill in the blanks with the correct words : – Alkanes are the (a) _______ [analogous / homologous] series of (b) _______ [saturated / unsaturated] hydrocarbons. They differ from alkanes due to the presence of (c) _________ [double / single] bonds. Alkenes mainly undergo (d) ________ [addition / substiution] reactions.  

Question .2. (i) State the structural formula of ethane.

(ii) Draw the structural formula of the two isomers of Butane. Give the correct IUPAC name of each.

(iii) From the following list, write down the appropriate words to fill in the blanks (a) to (e) below: -
Addition, carbohydrates, C_nH_2n-2, C_nH_2n, CnH_2n+2, electrochemical, homologus, hydrocarbons, saturated, substitution, unsaturated.

The alkane from an (a) ________ series with the general formula (b) __________. The alkanes are (c) __________ (d) __________ which generally undergo (e) ___________ reaction.

Question 3.Draw  the structure of cyclic Propane

Questions4. Nomeclature of Hydrocarbons. click below link
http://scienceworksheets.blogspot.in/2013/10/chemistry-organice-nomenclature-of.html

Hereditary and Evolution and Light Worksheet

                                                   Hereditary and Evolution

(Q.1)  Which contributed to the success of Mendel?

(a)Qualitative analysis of data
(b) Observation of distinct inherited traits
(c) His knowledge of biology
(d) Consideration of one character at a time

(Q.2)  Phenotypic trait is

(a) The visible characteristics of an organism
(b) The genetic constitution of an individual
(c) Gene ratio between individuals
(d) Form the basis of inheritance

(Q.3)  Dominant trait is one that:

(a) decides fate of organism in a population.
(b) is expressed in first filial generation.
(c) appears in the proportion of 1/4 in second filial generation.
(d) qualifies an organism to be the primary consumer.

(Q.4)  Mendel had perform his studies on

(a) garden Pea
(b) chick pea
(c) cow pea
(d) beans

(Q.5)  Mendelian laws apply only when-

(a) The parents are pure breeding
(b) The characters are linked
(c) One pair of contrasting character is dependent upon other pair
(d) F1 in a monohybrid cross shows two types of individuals

(Q.6)  Sex chromosomes may be defined as-

(a) Z-chromosomes
(b) G-chromosomes
(c) D-chromosomes
(d) X-chromosomes

Light

(Q.1)  Magnification produced by a concave mirror is

(a) Negative for a real image and Positive for a virtual image
(b) Only positive
(c) It produces no magnification
(d) Only negative

(Q.2)  Radius of curvature of a spherical mirror (or lens) is

(a) Half of its focal length
(b) Double of its focal length
(c) Equal to its focal length
(d) There is no relation

(Q.3)   A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

(Q.4)  What is the difference between real and virtual images?

(Q.5)   An object is placed at a distance of 10cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

(Q.6) Why do we  prefer convex mirror as a rear view mirror in vehicles?

(Q7). A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of object. Also find the  power of the lens?