General Science

What is the best description of base?

A reaction absorbing heat
B substance accepting H+ or producing OH− in water
C acid-base indicator red in acid and blue in base
D compressed natural gas, mainly methane

In general science, urea refers to:

A chemical/electrochemical deterioration of a material
B nitrogen fertiliser, CO(NH2)2
C water containing appreciable calcium or magnesium ions
D surface vaporisation below boiling point

Which of the following is most closely associated with noble gases?

A energy barrier associated with a reaction pathway
B fossil fuel consisting mainly of methane
C ionic compound of cations and anions
D Group 18 elements with very low reactivity

In general science, carbon dioxide refers to:

A CO, toxic product of incomplete combustion
B CO2, important greenhouse gas
C calcium sulfate hemihydrate
D an alcohol used in sanitizers, solvents and fuels

Which statement correctly identifies washing soda?

A chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
B anything having mass and occupying space
C nitrogen fertiliser, CO(NH2)2
D sodium carbonate decahydrate

What is the best description of reduction?

A calcium hydroxide
B temperature at which solid and liquid coexist at specified pressure
C synthetic surfactant used for cleaning
D gain of electrons or decrease in oxidation state

Which of the following is most closely associated with filtration?

A chemical/electrochemical deterioration of a material
B separation of insoluble solids from a fluid using a filter
C synthetic polyamide polymer
D fossil fuel consisting mainly of methane

In general science, plaster of Paris refers to:

A negatively charged ion
B Group 17 elements
C calcium sulfate hemihydrate
D negatively charged subatomic particle

Which statement correctly identifies group?

A material supplying plant nutrients
B vertical column in the periodic table
C combination of substances retaining their chemical identities
D number of protons plus neutrons

What is the best description of electrolyte?

A negatively charged ion
B anything having mass and occupying space
C substance producing ions in solution or molten state
D negatively charged subatomic particle

What is the best description of corrosion?

A NH3, basic nitrogen compound used in fertilisers
B SI amount-of-substance unit containing Avogadro’s number of entities
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D chemical/electrochemical deterioration of a material

Which statement correctly identifies ethanol?

A reaction absorbing heat
B an alcohol used in sanitizers, solvents and fuels
C compressed natural gas, mainly methane
D acid-base indicator red in acid and blue in base

Which statement correctly identifies matter?

A anything having mass and occupying space
B Group 18 elements with very low reactivity
C substance accepting H+ or producing OH− in water
D atom or group of atoms carrying net electric charge

What is the best description of vinegar?

A number of protons plus neutrons
B aqueous solution containing acetic acid
C vertical column in the periodic table
D elements showing intermediate metal/non-metal properties

In general science, halogens refers to:

A liquid hydrocarbon mixture from geological deposits
B reaction between acid and base forming salt and usually water
C Group 17 elements
D substance changing reaction rate without being consumed overall

Which of the following is most closely associated with stainless steel?

A elements generally showing conductivity, malleability and ductility
B combining capacity of an atom or ion
C steel containing sufficient chromium for corrosion resistance
D uncharged subatomic particle

Which of the following is most closely associated with polymer?

A large molecule made of repeating structural units
B water containing appreciable calcium or magnesium ions
C calcium sulfate dihydrate
D surface vaporisation below boiling point

Which statement correctly identifies electrolysis?

A Group 1 metals other than hydrogen
B positively charged subatomic particle
C positively charged ion
D chemical decomposition driven by electric current

In general science, period refers to:

A measure related to hydrogen-ion activity/concentration
B atom or group of atoms carrying net electric charge
C Group 1 metals other than hydrogen
D horizontal row in the periodic table

What is the best description of fertiliser?

A CO, toxic product of incomplete combustion
B SI amount-of-substance unit containing Avogadro’s number of entities
C CH4, simplest alkane and major natural-gas component
D material supplying plant nutrients

Which statement correctly identifies carbon monoxide?

A CO, toxic product of incomplete combustion
B water containing appreciable calcium or magnesium ions
C calcium sulfate dihydrate
D CH4, simplest alkane and major natural-gas component

Which statement correctly identifies acid?

A liquefied petroleum gas, mainly propane and butane
B reaction releasing heat
C fluoropolymer known for chemical resistance and low friction
D substance donating H+ in Brønsted-Lowry theory

Which of the following is most closely associated with exothermic reaction?

A substance donating H+ in Brønsted-Lowry theory
B loss of electrons or increase in oxidation state
C horizontal row in the periodic table
D reaction releasing heat

What is the best description of rust?

A corrosion product formed mainly on iron/steel
B sodium chloride
C biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
D fertiliser supplying nitrogen, phosphorus and potassium

What is the best description of polyethylene?

A polymer produced from ethene
B steel containing sufficient chromium for corrosion resistance
C substance releasing usable energy in combustion or another process
D small molecule that can form a polymer