General Science

What is the best description of gypsum?

A substance used to control pests
B CO2, important greenhouse gas
C smallest unit of an element retaining its chemical identity
D calcium sulfate dihydrate

Which statement correctly identifies combustion?

A positively charged subatomic particle
B rapid reaction with an oxidant commonly releasing heat
C Group 1 metals other than hydrogen
D positively charged ion

Which of the following is most closely associated with halogens?

A Group 17 elements
B rapid reaction with an oxidant commonly releasing heat
C large molecule made of repeating structural units
D mixture or solid solution of metals or metal with another element

Which of the following is most closely associated with base?

A substance accepting H+ or producing OH− in water
B surface vaporisation below boiling point
C water containing appreciable calcium or magnesium ions
D calcium sulfate dihydrate

Which of the following is most closely associated with carbon dioxide?

A methods such as painting, galvanising or alloying that reduce corrosion
B pure substance formed by chemical combination of elements in fixed proportions
C CO2, important greenhouse gas
D fertiliser supplying nitrogen, phosphorus and potassium

Which statement correctly identifies BOD?

A NH3, basic nitrogen compound used in fertilisers
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C anything having mass and occupying space
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which of the following is most closely associated with fertiliser?

A loss of electrons or increase in oxidation state
B substance donating H+ in Brønsted-Lowry theory
C horizontal row in the periodic table
D material supplying plant nutrients

Which of the following is most closely associated with combustion?

A reaction between acid and base forming salt and usually water
B rapid reaction with an oxidant commonly releasing heat
C fossil fuel consisting mainly of methane
D substance changing reaction rate without being consumed overall

Which of the following is most closely associated with acid?

A temperature at which solid and liquid coexist at specified pressure
B chemical decomposition driven by electric current
C substance donating H+ in Brønsted-Lowry theory
D synthetic surfactant used for cleaning

Which statement correctly identifies glass?

A amorphous inorganic solid commonly based on silica
B salts of higher fatty acids
C NH3, basic nitrogen compound used in fertilisers
D calcium oxide

Which statement correctly identifies mixture?

A measure related to hydrogen-ion activity/concentration
B combination of substances retaining their chemical identities
C reaction involving oxidation and reduction together
D solid fossil fuel formed largely from ancient plant matter

Which statement correctly identifies base?

A substance accepting H+ or producing OH− in water
B polyvinyl chloride polymer
C corrosion product formed mainly on iron/steel
D liquid hydrocarbon mixture from geological deposits

Which statement correctly identifies galvanisation?

A combining capacity of an atom or ion
B pure substance whose atoms have the same atomic number
C coating iron or steel with zinc
D uncharged subatomic particle

Which of the following is most closely associated with boiling point?

A coating iron or steel with zinc
B temperature at which solid and liquid coexist at specified pressure
C temperature at which vapour pressure equals surrounding pressure
D synthetic surfactant used for cleaning

Which statement correctly identifies fertiliser?

A material supplying plant nutrients
B combination of substances retaining their chemical identities
C number of protons plus neutrons
D methods such as painting, galvanising or alloying that reduce corrosion

In general science, atom refers to:

A chemical/electrochemical deterioration of a material
B synthetic polyamide polymer
C smallest unit of an element retaining its chemical identity
D fossil fuel consisting mainly of methane

Which statement correctly identifies fuel?

A atoms of the same element with different neutron numbers
B substance donating H+ in Brønsted-Lowry theory
C substance releasing usable energy in combustion or another process
D horizontal row in the periodic table

What is the best description of melting point?

A liquefied petroleum gas, mainly propane and butane
B reaction releasing heat
C substance changing colour over a characteristic pH range
D temperature at which solid and liquid coexist at specified pressure

What is the best description of galvanisation?

A smallest unit of an element retaining its chemical identity
B substance used to control pests
C CO2, important greenhouse gas
D coating iron or steel with zinc

In general science, combustion refers to:

A elements showing intermediate metal/non-metal properties
B acid-base indicator red in acid and blue in base
C rapid reaction with an oxidant commonly releasing heat
D vertical column in the periodic table

In general science, petroleum refers to:

A liquid hydrocarbon mixture from geological deposits
B small molecule that can form a polymer
C loss of electrons or increase in oxidation state
D rapid reaction with an oxidant commonly releasing heat

In general science, solute refers to:

A surface vaporisation below boiling point
B chemical/electrochemical deterioration of a material
C salts of higher fatty acids
D substance dissolved in a solution

Which statement correctly identifies quicklime?

A Group 1 metals other than hydrogen
B positively charged ion
C calcium oxide
D positively charged subatomic particle

What is the best description of halogens?

A Group 17 elements
B atom or group of atoms carrying net electric charge
C two or more atoms chemically bonded
D Group 18 elements with very low reactivity

What is the best description of exothermic reaction?

A reaction releasing heat
B SI amount-of-substance unit containing Avogadro’s number of entities
C NH3, basic nitrogen compound used in fertilisers
D acidic precipitation associated mainly with sulfur and nitrogen oxides