Year 9 Science

Practice Chemistry Test

Name:______

SECTION ONE: Multiple choice (2 marks each = total 26 marks)

Q1. Atoms:

A are the smallest particles of matter

B are the building blocks of elements

C cannot be broken into smaller particles

D contain a nucleus of protons and electrons

Q2. Which of the following is a noble gas?

A Oxygen

B Argon

C Potassium

D Aluminium

Q3. Ions:

A are positively charged atoms

B are negatively charged atoms

C are atoms with either a positive or negative charge

D none of the above

Q4. Alloys are mixtures of metals that are held together by metallic bonding. Metallic bonding is most likely to occur between atoms with the following atomic numbers:

A 11 and 20

B 12 and 6

C 19 and 9

D 7 and 8

Q5. Which of the following lists of solids contains only electrical conductors?

A tin, gold, ice, wood

B copper, zinc, magnesium, glass

C plastic, wood, air, salt

C copper, silver, aluminium, iron

Q6. Aluminium Iodide is an ionic compound. It has how many iodide atoms?

A one

B two

C three

D four

Q7. A nitrogen atom can form a nitride ion with the formula N. What is the number of electrons in the outer shell of a nitrogen atom?

A 3

B 5

C 7

D 8

Q8. Cations are:

A Negative ions usually metals

B Positive ions usually metals

C Negative ions usually non-metals

D Positive ions usually non-metals

Q9. J. J. Thomson invented:

A the “plum pudding model”

B the shell theory

C the term atom

D the term neutrons

Q10. The scientist who discovered that atoms consist of a positive nucleus with electrons orbiting in shells is:

A Rutherford

B Democritus

C Bohr

D Chadwick

Q11. Selenium appears in group VI of the periodic table and bromine is in group VII. The bonding between selenium and bromine atoms in a compound would most likely be:

A covalent

B ionic

C metallic

D unable to be determined from the information given

Q12. An element with atomic number 11 reacts with an element whose atomic number is 8. The bonding between atoms of these elements is most likely to be:

A covalent

B ionic

C metallic

D unable to be determined from the information given

Q13. Which of the following statements is false about metals:

A metals usually gain electrons to form anions

B metals are shiny due to the way light is reflected of delocalised electrons

C Metals conduct heat and electricity due to the delocalised electrons

D Metals are malleable because they rearrange themselves so that no like charges are near enough to repel

SECTION TWO: Short answer (74 marks)

NAME______

Q1. a) Label the atom above with the following terms: element name, protons, neutrons, electrons (2)

b) Is this atom a neutral atom? Explain your response. (2)

c) Where is this element positioned on the periodic table? Is it a metal or a non-metal or a metalloid? (2)

d) What does the group and period position tell us about the element? (2)

e) This element is a noble gas, what are the common features of these gases? (2)

Q2. A particle has 6 protons, 7 neutrons and 6 electrons.

a)  What name is given to a particle like this? (1)

b)  Which element is it? Explain your response (2)

c) Will it behave the same as an atom with 6 protons, 6 neutrons and 6 electrons? Explain (2)

Q3. Atoms that have more or fewer electrons than protons have become ions.

a)  Positive ions are also called……………………………. (1)

b)  Explain how atoms of some elements become positive ions. (2)

c)  Which elements typically become positive ions? (1)

d)  Negative ions are also called…………………………… (1)

e)  Explain how atoms of some elements become negative ions. (2)

f)  Which elements typically become negative ions?(1)

Q4. Name the type of bonding you would expect to find in the following substances and write the chemical formula: (16)

Substance / Bonding type / Chemical formula
magnesium oxide
calcium chloride
nitrogen dioxide
sodium oxide
Carbon dioxide
pure copper
copper sulfide
aluminium iodide

Q5. a) The atomic number is the smaller number on the periodic table. What does the atomic number tell us about the atom? (1)

b)  The mass number is the larger of the two numbers on the periodic table. What does the mass number tell us about the atom? (1)

c)  Using the mass number and atomic number for each of the following elements: write out the electron shell configuration (i.e. Lithium 2,1) and work out the number of protons and neutrons in each. (9)

a)  Aluminium Protons: Neutrons:

Electron configuration:

b)  Calcium Protons: Neutrons:

Electron configuration:

c)  Sulfur Protons: Neutrons:

Electron configuration:

Q6. A neutral atom of element 20 becomes an ion. How many electrons does it now have? What is its valency? Which noble gas will it match the electron configuration of? (3)

Q7. Draw the electron configuration using the concentric shell method for the following: (4)

a)  Cl

b)  Ca

Q8. Complete the following table: (5)

Ionic / Molecular
Type of bonding / Ionic bonding
Types of atoms
i.e. metal or non-metal or both
Do they share or give electrons?

Q9. Metalloids have properties of both metals and non-metals, list 3 properties that metals and non-metals have. (6)

Metals

1)

2)

3)

Non-metals

1)

2)

3)

Q10. Complete the dot diagrams for the following co-valent compounds. (6)

a)  HCl

b)  Water

c)  Carbon dioxide