S R INTERNATIONAL SCHOOL
BAREILLY
SUMMER
VACATION
HOMEWORK
[2015-16]
CHEMISTRY – WORKSHEET 1
NAME: ____________________________
DATE: _________________
An Elemental Tale
THE GOLD DUST KID
The kid mounted his trusty steed, old [B] _________________. His shooting [Fe]
_________________ strapped to his side, he headed out for the bright [Ne]_________________
lights of Sabattus, aiming to rob the Litchfield stage. There was sure to be a load of precious [U]
___________________ aboard, and probably [K] ____________________, too. Inhaling a deep
breath of [O] _____________ he coughed on the [S] _________________ from the nearby mills.
Since the [Hg] _________________ was climbing, he quenched his thirst with some H20, tasting the
[Cl] ____________________ all big cities like Wales had. As he headed north, his bones ached
from [Ca] ____________________ deposits built up over years of riding the [Zn]
____________________ trail. Overhead a [He] _______________ filled balloon floated in the
breeze; the sun beat down like burning [P] ____________________.
Soon he spotted the stage, guarded only by a sheriff with a [Sn] _______________ badge. “Halt,”
he yelled, “or I’ll fill you full of [Pb] ____________________.” The sheriff drew his gun, but alas,
was too slow. The kid’s gun, blazing like flaming [Mg] ____________________ did the [Cu]
____________________ in. Anyone who drew on the Kid should know his life wasn’t worth a
plugged [Ni] ____________________. A [Pt] ____________________ blonde riding beside the
[Al] ____________________ - framed coach rode for her life when the Kid pulled out some [N]
____________________ compounds, preparing to blow the safe to atoms.
Suddenly, a shout rang out, “Hi ho [Ag] ____________________, ” and a masked man on a white
horse raced across the [Si] ____________________ sands like [Na] ____________________
skittering on H20. A [H] ____________________ bomb would not have stopped the lawman; the
Kid had met his doom. The rest of his life was to be spent behind [Co] ____________________
steel bars, a warning to all who flirt with danger. Your first detention may be the initial step in a [C]
____________________ copy life of the saga of the [Au] ________________ Dust Kid.
Classify each of the following as an element, a compound or a mixture:
a. Coffee
_______________________
b. Silver
_______________________
c. Calcium carbonate
_______________________
d. Ink from a ball point pen
_______________________
e. Toothpaste
_______________________
f. Tap water
_______________________
Describe each of the following as a chemical change, physical change or both:
a. A wet towel dries in the sun
__________________________
b. Hot air rises over a radiator
__________________________
c. Lemon juice is added to tea, causing its color to change
__________________________
d. Coffee is brewed by passing hot water through ground
coffee
__________________________
e. Methane is burned in air
__________________________
f. Ice melts and becomes water
__________________________
Convert the following as directed:
a. 300 K to Celsius scale
b. 573 K to Celsius scale
c. 203 K to Celsius scale
d. 30ºC to Kelvin scale
e. 373ºC to Kelvin scale
f. 23ºC to Kelvin scale
S R INTERNATIONAL SCHOOL
BAREILLY
SUMMER
VACATION
HOMEWORK
CHEMISTRY – WORKSHEET 2
NAME: ____________________________
[2015-16]
DATE: _________________
Fill in the blanks with the information in the box below.
More than 2000 years ago, Greek philosophers proposed the existence of very small, indivisible particles,
each of which was called a(n) (1) ____________________. The theory that such particles existed was
supported, much later, by (2) ____________________, who proposed, in his law of (3)
____________________, that matter cannot be created or destroyed. Then (4) ____________________
proposed, in his law of (5) ____________________, that the ratio of the masses of elements in any given
compound is always the same. The law of (6) ____________________, proposed soon after, states that the
masses of one element that combine with a fixed mass of another element in different compounds are in
simple, whole-number ratios.
An atomic theory based on these laws was developed by (7)
____________________.
It was later proposed that the atom was not indivisible, but is made up of smaller particles, each of which is
called a(n) (8) ____________________.
These particles include the negatively-charged (9)
__________________, discovered by (10) ____________________; the positively-charged (11)
____________________; and the uncharged (12) ____________________, discovered by (13)
____________________. The latter two particles are present in the (14) ____________________, or
center, of the atom, which was discovered by (15) ____________________ in his gold foil experiment.
The number of positively-charged particles in an atom is called its (16____________________. The sum of
the positively-charged particles and the uncharged particles is called the (17) ____________________ of
the atom. Atoms that have the same number of positively-charged particles but different numbers of
uncharged particles are called (18) ____________________.
The Danish physicist (19) ___________________ proposed a model of the atom in which the electrons
orbit the nucleus without losing energy. He called each possible orbit a(n) (20) __________________.
He based his theory, to some extent, on the work of (21) ___________________, who proposed that light
is made up of units of energy of a definite amount, each of which is called a(n) (22) __________________
of energy.
atom
multiple proportions
Chadwick
Planck
Proust
Rutherford
Lavoisier
mass number
Bohr
nucleus
Dalton
electron
isotopes
Thomson
atomic number
neutron
conservation of matter
definite proportions
quantum energy level
subatomic particle
proton
Identify these scientists:
I PREDICTED THE EXISTENCE OF NEUTRONS
AND MADE A MODEL WITH A POSITIVE NUCLEUS
AND MOSTLY EMPTY SPACE
_______________________________________
I SUGGESTED THAT ELECTRONS TRAVEL IN DEFINITE
ENERGY LEVELS AROUND THE NUCLEUS
_______________________________________
I DISCOVERED THAT CATHODE RAYS WERE SMALL
NEGATIVE PARTICLES. I LIKE PLUM PUDDING
_______________________________________
I USED MY LAW OF MULTIPLE PROPORTIONS TO SUGGEST
MY INDIVISIBLE PARTICLE MODEL. I WAS ALSO COLOR BLIND.
_______________________________________
Write the chemical formula for each of the following:
a) Magnesium nitrite
______________________
b) Nitrogen trifluoride
______________________
c) Tin (IV) carbide
______________________
d) Phosphoric acid
______________________
e) Hydrobromic acid
______________________
Write the names of the following compounds:
1) Li2O
___________________________
2) AlCl3
___________________________
3) MgS
___________________________
4) Na2S
___________________________
5) CaO
___________________________
6) KBr
___________________________
7) A12O3
___________________________
8) CuC12
___________________________