General Science

Which statement correctly identifies valency?

A chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
B combining capacity of an atom or ion
C nitrogen fertiliser, CO(NH2)2
D anything having mass and occupying space

Which statement correctly identifies non-metals?

A elements generally lacking typical metallic properties
B measure related to hydrogen-ion activity/concentration
C reaction involving oxidation and reduction together
D solid fossil fuel formed largely from ancient plant matter

What is the best description of atomic number?

A number of protons in the nucleus
B mixture or solid solution of metals or metal with another element
C substance producing ions in solution or molten state
D large molecule made of repeating structural units

Which of the following is most closely associated with pesticide?

A reaction releasing heat
B substance used to control pests
C substance changing colour over a characteristic pH range
D elements generally lacking typical metallic properties

What is the best description of hard water?

A water containing appreciable calcium or magnesium ions
B steel containing sufficient chromium for corrosion resistance
C separation of insoluble solids from a fluid using a filter
D homogeneous mixture of solute and solvent

Which of the following is most closely associated with catalyst?

A substance changing reaction rate without being consumed overall
B uncharged subatomic particle
C combining capacity of an atom or ion
D elements generally showing conductivity, malleability and ductility

Which statement correctly identifies coal?

A arrangement of elements by atomic number and recurring properties
B solid fossil fuel formed largely from ancient plant matter
C elements generally lacking typical metallic properties
D substance changing colour over a characteristic pH range

Which statement correctly identifies urea?

A mixture or solid solution of metals or metal with another element
B large molecule made of repeating structural units
C substance producing ions in solution or molten state
D nitrogen fertiliser, CO(NH2)2

What is the best description of combustion?

A number of protons in the nucleus
B rapid reaction with an oxidant commonly releasing heat
C methods such as painting, galvanising or alloying that reduce corrosion
D pure substance formed by chemical combination of elements in fixed proportions

What is the best description of cation?

A temperature at which solid and liquid coexist at specified pressure
B synthetic surfactant used for cleaning
C positively charged ion
D calcium hydroxide

In general science, sublimation refers to:

A solid-to-gas change without passing through liquid
B liquefied petroleum gas, mainly propane and butane
C reaction releasing heat
D fluoropolymer known for chemical resistance and low friction

Which of the following is most closely associated with urea?

A sodium carbonate decahydrate
B aqueous solution containing acetic acid
C component that dissolves the solute
D nitrogen fertiliser, CO(NH2)2

What is the best description of mass number?

A temperature at which vapour pressure equals surrounding pressure
B coating iron or steel with zinc
C number of protons plus neutrons
D fluoropolymer known for chemical resistance and low friction

What is the best description of steel?

A calcium sulfate dihydrate
B CH4, simplest alkane and major natural-gas component
C iron-based alloy containing carbon
D water containing appreciable calcium or magnesium ions

In general science, stainless steel refers to:

A atoms of the same element with different neutron numbers
B steel containing sufficient chromium for corrosion resistance
C smallest unit of an element retaining its chemical identity
D substance used to control pests

What is the best description of group?

A vertical column in the periodic table
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

In general science, neutralisation refers to:

A calcium sulfate hemihydrate
B reaction between acid and base forming salt and usually water
C solid-to-gas change without passing through liquid
D amount of solute relative to a specified quantity

Which statement correctly identifies proton?

A liquid hydrocarbon mixture from geological deposits
B positively charged subatomic particle
C polyvinyl chloride polymer
D corrosion product formed mainly on iron/steel

In general science, LPG refers to:

A liquid hydrocarbon mixture from geological deposits
B liquefied petroleum gas, mainly propane and butane
C chemical/electrochemical deterioration of a material
D synthetic polyamide polymer

In general science, ethanol refers to:

A polyvinyl chloride polymer
B liquid hydrocarbon mixture from geological deposits
C an alcohol used in sanitizers, solvents and fuels
D corrosion product formed mainly on iron/steel

Which statement correctly identifies boiling point?

A synthetic polyamide polymer
B fossil fuel consisting mainly of methane
C temperature at which vapour pressure equals surrounding pressure
D energy barrier associated with a reaction pathway

What is the best description of activation energy?

A biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
B fertiliser supplying nitrogen, phosphorus and potassium
C sodium chloride
D energy barrier associated with a reaction pathway

In general science, fertiliser refers to:

A material supplying plant nutrients
B negatively charged subatomic particle
C negatively charged ion
D Group 17 elements

In general science, acid refers to:

A steel containing sufficient chromium for corrosion resistance
B separation of insoluble solids from a fluid using a filter
C polymer produced from ethene
D substance donating H+ in Brønsted-Lowry theory

Which statement correctly identifies PVC?

A water containing appreciable calcium or magnesium ions
B chemical/electrochemical deterioration of a material
C surface vaporisation below boiling point
D polyvinyl chloride polymer