Computa Quiz - ComputaNetworks

Question 1 / 20

When two or more atoms combine chemically, they form a:

A. Mixture B. Molecule C. Element D. Atom

Question 2 / 20

Which of the following represents a molecule of an element (containing only one type of atom)?

A. H2O B. CO2 C. O2 D. NaCl

Question 3 / 20

Pure water (H2O) is classified as a/an:

A. Element B. Mixture C. Compound D. Metal

Question 4 / 20

A single molecule of water consists of how many Hydrogen atoms?

A. One B. Two C. Three D. Four

Question 5 / 20

Which of the following is a compound?

A. Carbon dioxide B. Oxygen gas C. Iron filings D. Gold ribbon

Question 6 / 20

What is the chemical formula for common household salt?

A. H2O B. CO2 C. NaCl D. CaCO3

Question 7 / 20

A compound is formed when constituent elements combine:

A. Physically in any ratio B. Chemically in a fixed ratio C. Without any reaction D. Only at very low temperatures

Question 8 / 20

What does the chemical formula CO2 represent?

A. Carbon monoxide B. Carbon dioxide C. Copper oxide D. Calcium oxide

Question 9 / 20

The properties of a compound are usually:

A. Exactly the same as its constituent elements B. An average of its constituent elements C. Entirely different from its constituent elements D. Dependent only on the heavier element

Question 10 / 20

How many oxygen atoms are present in one molecule of Ozone (O3)?

A. One B. Two C. Three D. Four

Question 11 / 20

The smallest particle of a compound that can exist independently and show all properties of that compound is a/an:

A. Atom B. Molecule C. Element D. Electron

Question 12 / 20

When carbon burns completely in oxygen gas, it forms carbon dioxide. Carbon dioxide is a:

A. Mixture B. Element C. Compound D. Metal

Question 13 / 20

What is the chemical formula of pure water?

A. HO B. H2O C. HO2 D. H2O2

Question 14 / 20

In a molecule of Carbon Dioxide (CO2), how many carbon atoms are present?

A. One B. Two C. Three D. Zero

Question 15 / 20

Which of the following is NOT a compound?

A. Water B. Sugar C. Oxygen gas D. Baking soda

Question 16 / 20

The constituent elements of a compound can be separated from each other by:

A. Simple filtration B. Handpicking C. Chemical methods only D. Magnetic separation

Question 17 / 20

Which of the following is a molecule containing two atoms of the same element?

A. CO B. N2 C. HCl D. H2O

Question 18 / 20

The formula 'Glucose' is C6H12O6. How many types of elements make up glucose?

A. 3 B. 24 C. 6 D. 12

Question 19 / 20

A substance formed by the chemical combination of hydrogen and chlorine is Hydrogen Chloride. It is a:

A. Mixture B. Element C. Compound D. Atom

Question 20 / 20

Which of the following describes a molecule of water?

A. It contains 2 oxygen atoms and 1 hydrogen atom B. It contains 2 hydrogen atoms and 1 oxygen atom C. It is a mixture of gases D. It is a single atom

Quiz 2: Molecules and Compounds

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