WorksheetsPRE-UPS 1
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Which state of matter has particles that are tightly packed?
a)
Gas
b)
Solid
c)
Liquid
d)
All of the above
2.
Aluminium chloride, AlCl₃ exists as
a)
Atom
b)
Electron
c)
Ion
d)
Molecule
3.
Which of the following substances is NOT an element?
a)
Cu
b)
Ca
c)
Cl
d)
CO₂
4.
Water vapour cooling and turns into water droplets is an example of
a)
Condensation
b)
Evaporation
c)
Freezing
d)
Melting
5.
Isotopes are atoms of an element that
a)
have the same atomic number.
b)
different mass number but have the same proton number.
c)
has the same number of neutrons.
d)
different nucleon number but has the same mass number.
6.
The number of electrons in ⁶³₂₉Cu are
a)
28
b)
29
c)
62
d)
63
7.
Table 1 below shows the number of protons and neutrons of four different atoms. Which atoms are isotope?
a)
A and B
b)
B and D
c)
C and D
d)
B and C
8.
An element X has 10 electrons and 10 neutrons. What is the nucleon number of this element?
a)
18
b)
19
c)
20
d)
21
9.
The relative molecular mass is the mass of a molecule of a compound compared to
a)
the mass of a carbon-12 atom
b)
the mass of a hydrogen atom
c)
one twelfth the mass of a carbon-12 atom
d)
one twelfth the mass of a hydrogen atom
10.
What is the correct name for this polyatomic ion, ClO⁻
a)
chlorite
b)
chlorate
c)
perchlorate
d)
hypochlorite
11.
What is the name for Ca(HCO₃)₂
a)
Calcium dicarbonate
b)
Calcium Carbonate
c)
Calcium bicarbonate
d)
Calcium hypochlorite
12.
An atom with more electrons than protons is a
a)
anion
b)
cation
c)
neutral atom
d)
molecule
13.
An element Z has 11 protons and 12 neutrons. Which one is the correct isotopic notation of elemet Z?
a)
¹¹₁₂Z
b)
¹¹₂₃Z
c)
¹²₁₁Z
d)
²³₁₁Z
14.
How many atoms in 1 mol of potassium?
a)
6.02 x 10¹⁹ atoms
b)
6.02 x 10²⁰ atoms
c)
6.02 x 10²¹ atoms
d)
6.02x 10²³ atoms
15.
Which of the following is considered as an empirical formula?
a)
C₆H₁₂O₆
b)
C₂H₄O₂
c)
C₆H₆
d)
H₂O
16.
Which of the following represent a molecular formula and its empirical formula?
a)
molecular formula = CH₄ and empirical formula = CH₂
b)
molecular formula = C₂H₆ and empirical formula = C₂H₄
c)
molecular formula = C₃H₆ and empirical formula = CH₃
d)
molecular formula = C₅H₁₀ and empirical formula = CH₂
17.
What is the definition for Avogadro's number?
a)
number of grams per one mole of a substance
b)
6.02 x 10²³ particles per one mole of a substance
c)
simplest, whole number ratio of a chemical formula
d)
whole number ratio that is a multiple of a chemical formula
18.
Mass of one mole of carbon is equal to
a)
1/12 g
b)
12.00 g
c)
6.02×10²³ g
d)
6.23×10²³ g
19.
How many oxygen atoms, O are in 1.0 mole of oxygen gas, O₂ ?
a)
6.02×10²³ atoms of oxygen
b)
6.23×10²³ atoms of oxygen
c)
1.204×10²⁴ atoms of oxygen
d)
1.246×10²⁴ atoms of oxygen
20.
An organic compound composed of only C and H contains 6.00 mol C and 18.0 mol H. What is the empirical formula of the compound?
a)
CH
b)
CH₃
c)
C₂H
d)
C₂H₅
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