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Worksheets1st Semester Assessment
Total questions: 33
Worksheet time: 33mins
Which of these substances is a molecule?
Magnesium
Bromine gas
Sodium chloride
The table 1 below shows the number of protons and neutrons of three atoms, X, Y and Z.
Atoms X , Y and Z are
Ions
Isomers
Isotopes
Which of the following electron arrangements has three valence electrons?
Which of the following statements is true about the symbols of X and Y in Diagram 1?
X and Y have same chemical properties
X and Y have 6 valence electrons each
X and Y have same physical properties
Which of the following shows the electron arrangement and the number of neutrons in magnesium atom in Diagram 2?
2.8.2 / 24
2.8.2 / 12
2.8 / 12
When magnesium burns in excess oxygen gas, a white powder magnesium oxide, MgO is formed.
Which of the following is a balanced chemical equation to represent the reaction?
Mg(s) + O(g) → MgO(s)
Mg(s) + O2(g) → MgO(s) + O(g)
2Mg(s) + O2(g) → 2MgO(s)
The following equation represents the reaction of metal M with an acid.
M + 2HCl --> MCl2 + H2
What is the volume of hydrogen gas produced when 150 cm3 of 0.2 mol dm-3 hydrochloric acid is used?
[1 mol of gas occupies the volume of 24 dm3 at room temperature and pressure]
0.36 cm3
0.72 cm3
360.00 cm3
720.00 cm3
Diagram 3 shows the set-up of apparatus to determine the empirical formula of an oxide of metal X.
Which of the following is metal X?
Zinc
Copper
Tin
Sodium reacts with chlorine to form sodium chloride.
Which of the following equation represents this reaction?
Na + Cl2 --> NaCl2
Na + Cl --> NaCl
2Na + Cl2 --> 2NaCl
Which of the following is the correct chemical formula for aluminium sulphate?
Al3(SO4)2
Al2(SO4)3
AlSO4
Diagram shows the position of atom X in the Periodic Table. The electron arrangement of atom X is 2.8.Y.
What is the value of Y?
1
3
5
7
Astatine is below iodine in Group 17 in the Periodic Table.
Which of the following statement is TRUE for astatine?
Solid at room temperature
More electronegative than iodine
Exist as monoatom
Metal Z is soft and shiny. It reacts with cold water to produce an alkaline solution. What is metal Z?
Copper
Magnesium
Potassium
Which of the following elements are located in group 1?
Sodium
Xenon
Lithium
Aluminium
The following information is about element X.
- Can be used as catalyst in industry
- Forms complex ions
Which of the following is correct about element X?
It has a low melting point
It does not conduct electricity in solid state
It forms coloured compounds
Elements M,N and K are located in Group 17 of Periodic Table. Element N is more electronegative than element M.
The reaction of red-hot iron wool with gas M is more vigorous than the reaction of red-hot iron with gas K.
The reactivity of the three elements in ascending order is:
M, N, K
N, M, K
Element X is below potassium in the Periodic Table. We can predict that
Element X is less electropositive than potassium
Atom of element X has more valence electrons than potassium
Element X reacts more vigorously than potassium in oxygen
Which statements are true about elements when going across Period 3?
The atomic size of elements increases.
The electronegativity of atoms of the elements increase.
The properties of the oxide of the elements change from basic oxide to ampotheric oxide and acidic oxide.
The nuclei force of attraction of atoms towards electron to achieve stable electron arrangement becomes weaker.
Which of the following properties can be used to show that copper is a transition element?
Can conduct electric in the form of solid and liquid states
Ductile and malleable
Forms coloured ions
Table shows the property of oxides of elements R, S and T.
These elements are located in the same period in the Periodic Table of Elements.
Arrange the three elements across the period from left to right.
T, S, R
R, S, T
T, R, S
R, T, S
Which chemical equation is correctly balanced?
Na + O2 → Na2O
Zn + HCl → ZnCl2 + H2
Zn + H2SO4 → ZnSO4 + H2
The chemical formula of tetrachloromethane is CCl4.
What is its relative molecular mass?
[Relative atomic mass: C = 12, Cl = 35.5]
47.5
83.5
154
Kinetic Theory of Matter states that:
* The tiny particles are discrete
* The tiny particles move randomly
Which of following situations are explained by the theory?
Melting of lead(II) bromide
Combustion of magnesium in air
Bromine gas mixing with air
Aqueous copper(II) sulphate moving through a gel
Diagram shows the cooling curve for a sample of a pure substance X.
Which of the following statements is true about the arrangement of particles at time t?
All the molecules only vibrate and rotate at their fixed position
All the molecules move freely
Some of the molecules vibrate and rotate at their fixed positions and the others move from one point to another
Diagram hows the apparatus set-up to determine the empirical formula of copper(II) oxide.
The flow of dry hydrogen gas must be continued during the cooling process. What is the reason for this action?
To avoid the oxidation of copper to copper(II) oxide
To ensure the complete conversion of copper to copper(II) oxide
To remove the air from the combustion tube
Which of the following statements involve chemistry field?
Research in increasing the melting point of a substance
Investigate the resistance in electricity
Optimising the insulation for heat
Which of the following steps are carried out after the data collection?
Making observation
Making conclusion
Making hypothesis
Writing report
Diagram shows the arrangement of particles of a substance that undergoes change in the physical state through process Y at room condition.
Which of the following substances undergo process Y?
Naphthalene
Iodine
Chlorine
Ernest Rutherford suggested:
Positively charged sphere
Electrons move in shell
Negatively charged electrons scattered in the sphere
John Newlands suggested:
Arranging known elements in order of increasing atomic mass.
Law of Octaves.
Triad Law
Element X and Y are two different elements that are located in the same group in the
Periodic Table of Elements.
Which of the following statements is correct about their atoms?
Atoms of element X and Y have the same number of electrons
Number of neutron for atoms X and Y have changes during formation of an ion
Atoms of element X and Y have different number of protons
Diagram shows the electron arrangement of an ion of element Z.
Which of the following is true about element Z?
Located in Group 13 and Period 2 in the Periodic Table of Elements
The electron arrangement of atom Z is 2.8
Release three electrons to form an ion
Veronol is barbiturate used to induce sleep in psychiatric patients. The molecular formula of veronol is C8H12N2O3. What is the relative molecular mass of veronol?
[Relative atomic mass: H = 1, C = 12, N = 14, O = 16]
186
184
182
