Elements, Compounds and Mixtures

An Irish scientist who is now considered the father of chemistry proposed the first modern definition of an element. This scientist was
1. Robert Boyle
2. Isaac Newton
3. George Boole
4. Robert Kane
A substance that cannot be split into simpler substances by chemical means is known as
1. an element
2. a molecule
3. a compound
4. a mixture
One of the following substances is not an element. Which one is it?
1. Water
2. Hydrogen
3. Mercury
4. Nitrogen
Which one of the following elements is a liquid at room temperature?
1. Mercury
2. Oxygen
3. Iron
4. Gold
Approximately how many elements are there on earth?
1. 100
2. 10
3. 1,000
4. 20
Which one of the following elements has the symbol C?
1. Carbon
2. Calcium
3. Chlorine
4. Copper
What is the chemical symbol of the element phosphorus?
1. P
2. F
3. Ph
4. Fe
Elements are sometimes written with two letters. Magnesium is one of these elements.
What is the symbol for magnesium?
1. Mg
2. MG
3. mg
4. mG
Which one of the following elements is NOT a metal?
1. Nitrogen
2. Nickel
3. Mercury
4. Sodium
Which one of the following elements is a non-metal?
1. Carbon
2. Iron
3. Zinc
4. Gold
Which one of the following elements is used in party balloons?
1. Helium
2. Oxygen
3. Nitrogen
4. Neon
A substance which is made up of two or more elements chemically combined is known as
1. a compound
2. a molecule
3. an atom
4. a substance
Which one of the following substances is a compound?
1. Sodium fluoride
2. Iron
3. Oxygen
4. Hydrogen
Water is a compound made up of two different elements. These elements are
1. Hydrogen and oxygen
2. Hydrogen and nitrogen
3. Oxygen and iron
4. Sodium and chlorine
True or false?
The properties of a compound will be the same as the properties of the elements that make up the compound.
1. False
2. True
Where two or more substances are mixed together but not chemically combined, this substance is called
1. a mixture
2. a compound
3. an atom
4. a molecule
Which one of the following is a mixture?
1. Sea water
2. Water
3. Oxygen
4. Iron sulfide
Which one of the following substances is not a mixture?
1. Water
2. Air
3. Crude oil
4. Petrol
When iron filings and sulfur powder are mixed together at room temperature, which one of the following statements is correct?
1. The iron may be separated from the mixture by using a magnet.
2. The sulfur may be separated from the mixture by dissolving it in water.
3. A new compound called iron sulphide is formed.
4. They cannot be separated from each other.
Which one of the following statements about mixtures is correct?
1. A mixture must contain at least two different substances.
2. It is extremely difficult to separate a mixture into different substances.
3. The different substances in the mixture are in a definite proportion to each other.
4. A mixture is made up of elements chemically combined.
Which one of the following statements about compounds is correct?
1. The elements in a compound are always present in the same ratio.
2. It is easy to separate a compound into the elements that it is made from.
3. The properties of a compound are the same as the properties of the elements of which it is made up.
4. At least one of the elements in a mixture must be a gas.
What two elements make up common table salt?
1. Chlorine and sodium
2. Sodium and hydrogen
3. Sodium and oxygen
4. Chlorine and hydrogen
Which one of the following represents the compound called carbon dioxide?
1. CO₂
2. CO
3. H₂O
4. C
Which of the following represents the particles in a mixture?
Which of the following represents the particles in a compound?
A molecule is defined as the smallest part of an element or compound that can exist on its own. Which one of the following is ,b>not a molecule?
1. Sodium (Na)
2. Hydrogen (H₂)
3. Water (H₂O)
4. Sodium chloride (NaCl)
A substance made up of only one type of atom is called
1. an element
2. a mixture
3. a compound
4. a gas
The smallest part of a compound which still has the properties of that compound is called
1. a molecule
2. an atom
3. a mixture
4. a solid
Which one of the following elements is used in jewelry?
1. Silver
2. Potassium
3. Nitrogen
4. Carbon
Which one of the following elements is used in window and door frames?
1. Aluminium
2. Potassium
3. Nitrogen
4. Carbon
Which one of the following may be classified as a compound and as a molecule?
1. Water
2. Crude oil
3. Oxygen
4. Sodium
A compound is a molecule that contains at least two different elements. Each of the following substances in the list are molecules. One of these is not a compound.
Which one is it?
If a substance consists of more than one type of atom chemically combined, then it is
1. a compound
2. a mixture
3. an element
4. a molecule
The photograph is of Marie Curie (1867-1934).
She showed the existence of the element radium and she produced 0.1 g of the compound radium chloride in 1902 by processing tons of pitchblende ore obtained from mines in Bohemia.
What is meant by the term compound?
1. A substance made up of two or more different types of atom chemically combined.
2. A substance made up of two or more different types of atom mixed together but not chemically combined.
3. A substance that cannot be split up into simpler substances by chemical means.
4. A substance made up of only one type of atom.
The photograph is of Marie Curie (1867-1934).
She showed the existence of the element radium and she produced 0.1 g of the compound radium chloride in 1902 by processing tons of pitchblende ore obtained from mines in Bohemia.
What is meant by the term element?
1. A substance made up of only one type of atom.
2. A substance made up of more than one type of atom.
3. A substance containing different elements not chemically combined.
4. A substance made up of many different types of atom.
Which two of the following statements are correct?
1. Elements consist of only one type of atom.
2. Compounds consist of two or more different types of atom.
3. A compound can easily be split up into its different elements.
4. An element is always represented by a symbol consisting of two letters such as He.
Matter is the ‘stuff’ that all things are made of, including us.
The diagram shows how some types of matter are classified.
The diagram is not complete.
Elements are often divided into two sub-groups.
What are these two sub-groups A and B?
1. Metals and non-metals
2. Liquids and gases
3. Metals and liquids
4. Non-metals and gases
Which one of the following statements is correct?
1. Water is a compound and nitrogen is an element.
2. Water is an element and nitrogen is a compound.
3. Water and nitrogen are both compounds.
4. Water and nitrogen are both elements.
Natural gas is mainly methane (CH₄).
What two elements are found in methane?
1. Carbon and hydrogen
2. Carbon and oxygen
3. Magnesium and hydrogen
4. Magnesium and oxygen
Which of the following statements is correct?
1. Air is a mixture and table salt is a compound.
2. Table salt is a mixture and carbon is a compound.
3. Air is a mixture and carbon is a compound.
4. Carbon is a mixture and air is a compound.
How many atoms out there in a molecule of CO₂?
1. 3
2. 2
3. 1
4. 4
How many atoms are there in a molecule of CH₄?
1. 5
2. 4
3. 2
4. 3
Which one of the following four statements is incorrect?
1. All elements are solid at room temperature.
2. Iron contains only one type of atom.
3. Water is not an element.
4. The element Mercury is a liquid at room temperature.
Which one of the following four statements is correct?
1. Compounds always contain different types of atom.
2. Water is an element made up of hydrogen and oxygen atoms.
3. The symbol for sodium is So.
4. All gases are elements.
Study the four diagrams representing different substances.
Which two of these diagrams represents elements?
1. A and B
2. B and C
3. C and D
4. A and D
Which one of the following diagrams represents a mixture, an element and a compound?
1. D
2. A
3. B
4. C
Which of the following is made up only of one type of atom?
1. Aluminium foil
2. A crystal of table salt
3. A drop of water
4. Tomato ketchup
How many different types of atom may be present in a compound?
1. Two or more different types
2. Only one type of atom
3. Exactly four different atom types
4. Three or more different atom types
This diagram represents
1. a compound
2. an element
3. a mixture
4. an atom
This diagram represents
1. a mixture
2. an element
3. a compound
4. an atom
This diagram represents a model of
1. an atom
2. an element
3. a compound
4. a mixture
Of the four boxes shown, which one represents a model of elements only?
1. A and C
2. B and D
3. B and C
4. A, C and D
Of the four boxes shown, which one represents a model of chemical compounds only?
1. B
2. B, C and D
3. B and D
4. C
A compound is a substance that
1. is made up of two or more elements chemically joined together.
2. contains two or more elements physically combined together in a fixed ratio.
3. contains only metallic elements chemically joined together.
4. is made up of only element.
Which of the following sets of substances represents mixtures only?
1. Brass, seawater and air
2. Gold, carbon and air
3. Orange juice, sodium and hydrogen
4. Air, blood and sodium chloride
Copper sulfate can be broken down into simpler substances by chemical means. It is therefore
1. a compound
2. a mixture
3. an element
4. an atom
A beaker containing a black-yellow powder has a magnet put into it. When the magnet is removed, black particles are stuck to it, leaving a yellow powder behind in the beaker.
The black-yellow powder is therefore
1. a mixture
2. an element
3. an atom
4. a compound
When a substance is analysed using an electron microscope, it is found to contain only one type of atom.
This substance is
1. an element
2. a compound
3. a mixture
4. neither of the other three
Study the diagrams representing elements, compounds and mixtures shown, and choose the correct statement from the following:
1. X represents an element and W represents a mixture.
2. Y represents an el.ement and W represents a mixture
3. X represents an element and Z represents a mixture.
4. Y represents a compound and Z represents a mixture.
The smallest part of an element that still has the properties of that element is called
1. an atom
2. a molecule
3. a mixture
4. a compound

Elements, Compounds and Mixtures

Multiple Choice Quiz