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WorksheetsChemistry Test
Total questions: 25
Worksheet time: 13mins
1. Subatomic particles with a negative charge
Electrons
protons
neutrons
The noble gases, such as helium "He" and xenon "Xe", are non-reactive because:
they are chemically unstable
they have been around longest on the Earth
They have completely filled their outer electron shells
they are unusually large atoms.
Elements in the same column on the periodic table have similar chemical re-activity because:
They contain similar amounts of energy levels
they have the same number of valence shell electrons
atoms prefer to have completely full or completely empty valence shells
they have similar numbers of isotopes
How many neutrons does the isotope below have? 89 36Kr
53
39
123
36
If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?
I. 7735X
II. 7733X
III. 8137X
IV. 8135 X
I and II
III and IV
I and III
I and IV
Which is NOT an example of a physical change?
tearing paper
chopping wood
molding clay
burning wood
What is an atom that has an unstable nucleus and undergoes radioactive decay?
Radiation
Radioisotopes
Radioactivity
The following are pure substances EXCEPT:
oxygen
water
lemonade
sand
Which of the following statements are true for pure substances?
pure substances contain only one kind of particles
pure substances have the same composition throughout
pure substances may be compound or mixtures
Pure substance can be exemplified by all elements other than nickel
Name the techniques depicted in the picture.
Colloidal
Tyndall
Suspension
Brownian
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer.
Which of the following dye(s) is/are safe for use?
P only
P and X only
P and R only
P and S only
In Chromatography the retardation factor Rf are used for identification of components.
A high Rf mean the component has a
greater affinity to the stationary phase
greater affinity to the mobile phase
no affinity to the stationary phase
lesser affinity to the mobile phase
Which state of matter that has a definite volume and shape.
solid
liquid
gas
plasma
A gas has an/a
definite shape, definite volume
found in the stars
Indefinite shape, indefinite volume
Indefinite shape, definite volume
Particles of a liquid
have no viscosity.
are tightly packed together and stay in a fixed position.
decrease in volume with increasing temperature.
are free to move around one another but still touch.
The Rf value for the blue component is
0.1
0.3
10
3
Of the halogens, which has the smallest atomic radius?
F
Cl
Br
I
Which alkaline earth metal is the least reactive?
Mg
Ca
Br
Be
Which of the period 3 elements has the largest electronegativity?
Fluorine
Chlorine
Argon
Sodium
Electronegativity is define ..
the energy required to remove an electron from a specific atom
the ability of an atom to attract electrons
he ability of an atom to lose electrons
how easy it is to make friends.
Which "Halogen" would be able to replace Chlorine in Sodium Chloride?
Fluorine
Astatine
Bromine
Iodine
Which of the following physical properties decreases when going down group 2 ?
First ionisation energy
Number of electron shells
Atomic radius
Number of valence electrons
When you put Calcium in water, what molecule forms?
Calcium hydrate
calcium precipitate
calcium hydroxide
magnesium oxide
Which equation shows the displacement of bromine by chlorine?
2NaBr + Cl2 → 2NaCl + Br-
2NaBr + Cl2 → 2NaCl + Br2
NaBr + Cl- → NaCl + Br2
NaBr + 2Cl- → NaCl + 2Br-
which statement is true about halogens?
form covalent compounds with other non-metallic elements
Form ionic compound with hydrogen
A less reactive halogen will displace a more reactive element form its ionic salt
form negative ion of charge -2
