Unit ReviewUse this to review your understanding of the Unit.Click on either True or False or Multiple Choice.Click on the Home icon to get back to this page.

True or False

Multiple Choice

In decomposition of hydrogen peroxide, the enzyme catalase found in the liver acts as a catalyst.

True False

The formula for disulfur dichloride is:

S2Cl2

True False

The water that comes out of the tap in your kitchen is a pure substance.

FalseTrue

In phosphorus pentachloride , the phosphorus atom is bonded covalently to five chlorine atoms.

True False

The formula for potassium oxide is:

P4O10

FalseTrue

In losing 3 electrons, aluminum atom becomes aluminide ion

FalseTrue

The chemical formula for lithium bromide will be:

Li2Br

FalseTrue

The formula for iodine heptafluoride is:

IF7

True False

Aluminum is very shiny.

The above statement describe the “lustre” of aluminum.

True False

According to the particle theory, in solids the particles are very closed together and are in random constant motion.

True False

If an atom has 16 protons, 16 electrons and 17 neutrons, it is an isotope of the element Chlorine.

FalseTrue

The Periodic Table of Elements arrange elements based on their atomic number.

True False

In CaCl2, the calcium atom is covalently bonded to 2 chlorine atoms

FalseTrue

Blue gatorade drink is an example of mechanical mixture.

FalseTrue

Silicon has an atomic mass of 28.09 u. This means that the most common isotope of Silicon has 14 neutrons.

True False

End of True or False

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In reaction with metals, non-metals tend to:

A. Receive the metal’s outer orbit electrons and become negatively charged ions.

C. Share the electrons located in their outer orbit

B. Donate the electrons in their outer orbit and become negatively charged ions.

D. Share the electrons located in their inner orbits

Which of the following is NOT part of John Dalton’s theory of atom?

A. Atoms contain negatively charged particles called electrons

C. Atoms of an element are identical, but atoms of different elements are different

B. All matter is made up of tiny, indivisible particles called atoms

D. Atoms can be rearranged, but never created or destroyed

Which of the following is NOT TRUE?

C. All Group 14 elements have 14 valence electrons

B. All Group 17 elements have 7 valence electrons

A. All Group 2 elements have 2 valence electrons

D. All Group 1 elements have 1 valence electron

Discover the neutron component of an atom:

A. Chadwick

C. Rutherford

B. Bohr

D. Dalton

Which of the following statements is TRUE?

B. The atomic mass can be used to find out the number of neutrons that an element has.

C. The number of electrons of a neutral atom will be greater than the number of protons..

A. The atomic number indicates the number of protons and neutrons of an element.

D. None of the above

Carbon – 14 is an isotope of carbon. It has:

B. 6 protons and 8 neutrons

C. 8 protons and 6 neutrons

A. 7 protons and 7 neutrons

D. 6 protons and 6 neutrons

Solid blocks of four pure substances are placed in water as shown. What can be said about the density of the substances?

B. Density of substance 2 is less than density of water

C. Densities of substances 1, 3 and 4 are less than density of water

A. They have the same density

D. The density of substance 2 is greater than the others

Which is NOT a characteristic physical property?

B. Mass

C. Boiling point

A. Density

D. Melting point

In Bohr-Ruther Diagram:

B. The first orbit can hold a maximum of 2 electrons

C. The neutrons are drawn orbiting the nucleus

A. All orbits can hold a maximum of 8 electrons

D. None of the above is true

A 20.0 g sample of wood has a density of 0.50 g/cm3. What is the volume of the sample?

B. 40 cm3

C. 10 cm3

A. 20 cm3

D. 25 cm3

Cubes A and B are uniform throughout and come into perfect balance on a scale shown below. How do the densities of the two objects compare?

C. Object A has greater density

B. There is not enough information to tell

A. The objects have the same density

D. Object B has greater density

An alloy is an example of a:

A. Solution

C. Pure substance

B. Mechanical mixture

D. None of the above

The least reactive group of elements:

D. Noble gases

B. Alkaline Earth metals

A. Alkali metals

C. Halogens

The correct name for compound KF is:

C. Potassium fluoride

B. Potasside fluorine

A. Potassium fluorine

D. Potasside fluoride

Which of the following is NOT TRUE for Alkaline Earth Metals?

C. Can be found as solids, liquids or gas

B. Burn with bright, colourful flames

A. Shiny and silvery

D. More reactive as you move down the periodic table

Which of the following represents a physical change?

D. All of the above

B. Cutting a piece of wood into two

A. Dissolving salt into water

C. A cube of ice melting at room temperature

The Bohr-Rutherford diagram of Magnesium suggests that in ionic compounds, Magnesium will have an ionic charge of:

C. +2

B. -2

A. 0

D. -1

To find out whether a mystery white powder is made up of salt or cornstarch, you can do the following test:

C. Add iodine solution and see if the powder turns blue-black in colour

B. Add iodine solution and see if the powder turns red in colour

A. Dissolve them in water. Only salt will dissolve in water.

D. None of the above

In doing a gas test you insert a glowing splint into the tube. You then see splint re-lighted. The gas produced is:

C. Oxygen gas

B. Carbon dioxide

A. Hydrogen gas

D. Water vapour

All group 15 elements:

B. Have 5 valence electrons

C. Are metals

A. Have 15 valence electrons

D. Will lose 3 valence electrons when forming ionic compounds

In forming ionic compound between Magnesium and Chlorine, the composition will be:

D. 1 Magnesium bonded to 2 Chlorine

B. 1 Magnesium bonded to 1 Chlorine

A. 2 Magnesium bonded to 2 chlorine

C. 2 Magnesium bonded to 1 Chlorine

The picture shown represents:

A. A molecule C. Various ions

B. An ionic compound D. An element

Alkali metals are:

D. All of the above

B. Relatively low densities, can float on water

A. Shiny, silvery and soft

C. Highly reactive

In a block of ice, the molecules are:

A. Vibrating back and forth, but remaining more or less in one location

C. Completely motionless

B. Freely sliding past one another, but remaining close together

D. Extremely disorganized with no recognizable pattern to their locations

Congratulations!You have reached the end of the review.

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