General Science

Which of the following is most closely associated with vinegar?

A synthetic polyamide polymer
B fossil fuel consisting mainly of methane
C chemical/electrochemical deterioration of a material
D aqueous solution containing acetic acid

What is the best description of element?

A Group 1 metals other than hydrogen
B pure substance whose atoms have the same atomic number
C positively charged subatomic particle
D positively charged ion

Which of the following is most closely associated with rust prevention?

A positively charged ion
B methods such as painting, galvanising or alloying that reduce corrosion
C measure related to hydrogen-ion activity/concentration
D Group 1 metals other than hydrogen

What is the best description of common salt?

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

Which of the following is most closely associated with salt?

A ionic compound of cations and anions
B NH3, basic nitrogen compound used in fertilisers
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D calcium oxide

Which statement correctly identifies electrolyte?

A substance donating H+ in Brønsted-Lowry theory
B substance producing ions in solution or molten state
C horizontal row in the periodic table
D atoms of the same element with different neutron numbers

In general science, atomic number refers to:

A aqueous solution containing acetic acid
B number of protons in the nucleus
C component that dissolves the solute
D sodium carbonate decahydrate

In general science, PTFE/Teflon refers to:

A fluoropolymer known for chemical resistance and low friction
B calcium sulfate dihydrate
C CH4, simplest alkane and major natural-gas component
D CO, toxic product of incomplete combustion

In general science, gypsum refers to:

A calcium sulfate dihydrate
B substance accepting H+ or producing OH− in water
C atom or group of atoms carrying net electric charge
D Group 18 elements with very low reactivity

What is the best description of filtration?

A vertical column in the periodic table
B number of protons plus neutrons
C elements showing intermediate metal/non-metal properties
D separation of insoluble solids from a fluid using a filter

Which of the following is most closely associated with distillation?

A separation based mainly on differences in boiling points
B compressed natural gas, mainly methane
C reaction absorbing heat
D amorphous inorganic solid commonly based on silica

Which statement correctly identifies slaked lime?

A calcium hydroxide
B substance donating H+ in Brønsted-Lowry theory
C atoms of the same element with different neutron numbers
D horizontal row in the periodic table

Which statement correctly identifies rust?

A CO, toxic product of incomplete combustion
B two or more atoms chemically bonded
C corrosion product formed mainly on iron/steel
D mass of one mole of a substance

Which of the following is most closely associated with CNG?

A chemical decomposition driven by electric current
B synthetic surfactant used for cleaning
C compressed natural gas, mainly methane
D temperature at which solid and liquid coexist at specified pressure

Which statement correctly identifies filtration?

A reaction between acid and base forming salt and usually water
B substance changing reaction rate without being consumed overall
C separation of insoluble solids from a fluid using a filter
D Group 17 elements

Which statement correctly identifies steel?

A methods such as painting, galvanising or alloying that reduce corrosion
B iron-based alloy containing carbon
C aqueous solution containing acetic acid
D O3, allotrope of oxygen

Which of the following is most closely associated with methane?

A temperature at which vapour pressure equals surrounding pressure
B CH4, simplest alkane and major natural-gas component
C salts of higher fatty acids
D coating iron or steel with zinc

What is the best description of indicator?

A coating iron or steel with zinc
B temperature at which vapour pressure equals surrounding pressure
C fluoropolymer known for chemical resistance and low friction
D substance changing colour over a characteristic pH range

In general science, reduction refers to:

A fertiliser supplying nitrogen, phosphorus and potassium
B gain of electrons or decrease in oxidation state
C biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
D pure substance whose atoms have the same atomic number

In general science, distillation refers to:

A measure related to hydrogen-ion activity/concentration
B solid fossil fuel formed largely from ancient plant matter
C separation based mainly on differences in boiling points
D reaction involving oxidation and reduction together

What is the best description of period?

A smallest unit of an element retaining its chemical identity
B substance used to control pests
C horizontal row in the periodic table
D CO2, important greenhouse gas

Which of the following is most closely associated with evaporation?

A component that dissolves the solute
B substance producing ions in solution or molten state
C surface vaporisation below boiling point
D mixture or solid solution of metals or metal with another element

Which of the following is most closely associated with atomic number?

A NH3, basic nitrogen compound used in fertilisers
B number of protons in the nucleus
C calcium oxide
D acidic precipitation associated mainly with sulfur and nitrogen oxides

What is the best description of petroleum?

A vertical column in the periodic table
B number of protons plus neutrons
C elements showing intermediate metal/non-metal properties
D liquid hydrocarbon mixture from geological deposits

What is the best description of ion?

A component that dissolves the solute
B atom or group of atoms carrying net electric charge
C sodium carbonate decahydrate
D separation based mainly on differences in boiling points