Download N5_Ink_Ex_1_Unit_1

National 5 Chemistry Chemical Changes and Structure
Ink Exercise 1
Name:__________________
Q1. The diagram represents the structure of an atom.
a) Complete the table.
(2)
b) Ernest Rutherford used alpha particles to confirm the structure of the atom. The table
shows the number of protons, electrons and neutrons in an alpha particle.
b)i) What is the atomic number of an alpha particle? _________
(1)
b)ii) When alpha particles are passed through an electric field, which letter in the diagram
shows the path taken by them? _________
(1)
Q2. Electrolysis of molten sodium hydride produces a gas.
a) Explain the term electrolysis
__________________________________________________________________
__________________________________________________________________
_______________________________________________________________ (2)
b) Identify the electrode that the gas would be produced at. State the name of the gas
produced and how could you test for the gas.
__________________________________________________________________
________________________________________________________________(2)
c) Why must molten sodium hydride be used?
__________________________________________________________________
________________________________________________________________(1)
Q3. Circle the correct answer.
An atom is neutral because
A The number of electrons equals the total number of protons plus neutrons.
B The number of neutrons equals the total number of electrons plus protons.
C The number of protons equals the number of neutrons
D The number of electrons equals the number of protons.
(1)
Q5. The element carbon can exist in the form of diamond.
The structure of diamond is shown below.
a) Name the type of bonding and structure present in diamond.
_______________________________________________________________ (1)
b) Carbon forms many compounds with other elements such as hydrogen.
i)
ii)
Draw a diagram to show how the outer electrons are arranged in a molecule of
methane, CH4.
(1)
Draw a diagram to show the shape of a molecule of methane.
(1)
Q6. Circle the correct answer.
Which of the following numbers is the same for lithium and oxygen atoms?
A Mass number
B Atomic Number
C Number of outer electrons
D Number of occupied energy levels
(1)
Q7. Glass is made from the chemical silica, SiO2, which is covalently bonded and has a melting
point of 1700˚C.
a) What does the melting point of silica suggest about its
structure?________________________________________________________(1)
b) Antimony oxide, Sb2O3, is added to reduce any bubbles that may appear during the
manufacturing process. What type of bonding will be present in Antimony
oxide?___________________________________________________________(1)
c) In the manufacture of glass, other chemicals can be added to alter the properties of
the glass. The element boron can be added to glass to make oven proof dishes.
c)i) Information about an atom of boron is given in the table below.
Use the information to complete the nuclide notation for this atom of Boron.
______________________________________________________
(1)
d) Atoms of boron exist which have the same number of protons but a different number of
neutrons from that shown in the table. What name can be used to describe the
different atoms of boron?
_________________________
(1)
Q8. Outer electron diagrams for atoms can give lots of information about an atom.
a) Draw an outer electron diagram for a Mg2+ ion
(1)
b) Describe the relationship between the number of outer electrons an atom has and which
periodic table group it is in.
__________________________________________________________________
________________________________________________________________(1)
Q9. Electricity can be produced in an electrochemical cell.
a) Explain how the electrical charge is carried through the wires and solution in an
electrochemical Cell.
__________________________________________________________________
________________________________________________________________(1)
b) Explain the function of an electrolyte.
________________________________________________________________(1)
c) What are electrolytes generally made of?
________________________________________________________________(1)
Q10. The table below contains information about some substances.
a) Identify the substance which exists as a covalent network ________
(1)
b) Identify the ionic compound ___________
(1)
Total (25)