General Science

In general science, pH refers to:

A measure related to hydrogen-ion activity/concentration
B coating iron or steel with zinc
C temperature at which vapour pressure equals surrounding pressure
D salts of higher fatty acids

Which statement correctly identifies element?

A elements showing intermediate metal/non-metal properties
B pure substance whose atoms have the same atomic number
C acid-base indicator red in acid and blue in base
D vertical column in the periodic table

Which statement correctly identifies electron?

A iron-based alloy containing carbon
B small molecule that can form a polymer
C separation based mainly on differences in boiling points
D negatively charged subatomic particle

What is the best description of atom?

A reaction between acid and base forming salt and usually water
B Group 17 elements
C smallest unit of an element retaining its chemical identity
D substance changing reaction rate without being consumed overall

In general science, compound refers to:

A small molecule that can form a polymer
B gain of electrons or decrease in oxidation state
C substance releasing usable energy in combustion or another process
D pure substance formed by chemical combination of elements in fixed proportions

What is the best description of ammonia?

A NH3, basic nitrogen compound used in fertilisers
B reaction releasing heat
C liquefied petroleum gas, mainly propane and butane
D substance changing colour over a characteristic pH range

Which statement correctly identifies endothermic reaction?

A combining capacity of an atom or ion
B reaction absorbing heat
C uncharged subatomic particle
D pure substance whose atoms have the same atomic number

Which of the following is most closely associated with polyethylene?

A sodium chloride
B sodium hydrogen carbonate, NaHCO3
C fertiliser supplying nitrogen, phosphorus and potassium
D polymer produced from ethene

What is the best description of glass?

A component that dissolves the solute
B separation based mainly on differences in boiling points
C sodium carbonate decahydrate
D amorphous inorganic solid commonly based on silica

What is the best description of washing soda?

A ethanoic acid, CH3COOH
B gas absorbing and emitting infrared radiation
C calcium hypochlorite-based bleaching/disinfecting material
D sodium carbonate decahydrate

Which statement correctly identifies carbon dioxide?

A CO2, important greenhouse gas
B synthetic surfactant used for cleaning
C temperature at which solid and liquid coexist at specified pressure
D calcium hydroxide

In general science, valency refers to:

A combining capacity of an atom or ion
B smallest unit of an element retaining its chemical identity
C atoms of the same element with different neutron numbers
D substance used to control pests

In general science, boiling point refers to:

A iron-based alloy containing carbon
B separation based mainly on differences in boiling points
C temperature at which vapour pressure equals surrounding pressure
D small molecule that can form a polymer

In general science, ion refers to:

A ethanoic acid, CH3COOH
B atom or group of atoms carrying net electric charge
C gas absorbing and emitting infrared radiation
D material supplying plant nutrients

What is the best description of rust prevention?

A nitrogen fertiliser, CO(NH2)2
B methods such as painting, galvanising or alloying that reduce corrosion
C chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
D calcium hydroxide

In general science, baking soda refers to:

A SI amount-of-substance unit containing Avogadro’s number of entities
B positively charged subatomic particle
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D sodium hydrogen carbonate, NaHCO3

Which of the following is most closely associated with soap?

A salts of higher fatty acids
B chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
C anything having mass and occupying space
D negatively charged subatomic particle

Which of the following is most closely associated with corrosion?

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 chemical/electrochemical deterioration of a material

Which of the following is most closely associated with rust?

A measure related to hydrogen-ion activity/concentration
B positively charged ion
C Group 1 metals other than hydrogen
D corrosion product formed mainly on iron/steel

Which of the following is most closely associated with greenhouse gas?

A ethanoic acid, CH3COOH
B gas absorbing and emitting infrared radiation
C substance used to control pests
D CO2, important greenhouse gas

What is the best description of non-metals?

A combining capacity of an atom or ion
B elements generally showing conductivity, malleability and ductility
C elements generally lacking typical metallic properties
D substance changing colour over a characteristic pH range

Which of the following is most closely associated with ozone?

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B CH4, simplest alkane and major natural-gas component
C calcium sulfate dihydrate
D O3, allotrope of oxygen

In general science, indicator refers to:

A calcium hydroxide
B nitrogen fertiliser, CO(NH2)2
C synthetic surfactant used for cleaning
D substance changing colour over a characteristic pH range

In general science, detergent refers to:

A pure substance whose atoms have the same atomic number
B synthetic surfactant used for cleaning
C fertiliser supplying nitrogen, phosphorus and potassium
D biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water

In general science, monomer refers to:

A coating iron or steel with zinc
B small molecule that can form a polymer
C temperature at which vapour pressure equals surrounding pressure
D salts of higher fatty acids