General Science

In general science, exothermic reaction refers to:

A negatively charged ion
B negatively charged subatomic particle
C Group 17 elements
D reaction releasing heat

What is the best description of methane?

A CH4, simplest alkane and major natural-gas component
B substance donating H+ in Brønsted-Lowry theory
C loss of electrons or increase in oxidation state
D rapid reaction with an oxidant commonly releasing heat

Which of the following is most closely associated with molar mass?

A mass of one mole of a substance
B liquid hydrocarbon mixture from geological deposits
C substance changing reaction rate without being consumed overall
D reaction between acid and base forming salt and usually water

In general science, rust prevention refers to:

A methods such as painting, galvanising or alloying that reduce corrosion
B number of protons in the nucleus
C arrangement of elements by atomic number and recurring properties
D pure substance formed by chemical combination of elements in fixed proportions

What is the best description of polymer?

A substance changing colour over a characteristic pH range
B large molecule made of repeating structural units
C liquefied petroleum gas, mainly propane and butane
D reaction releasing heat

In general science, solution refers to:

A sodium carbonate decahydrate
B homogeneous mixture of solute and solvent
C aqueous solution containing acetic acid
D substance dissolved in a solution

What is the best description of molar mass?

A pure substance formed by chemical combination of elements in fixed proportions
B number of protons in the nucleus
C biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
D mass of one mole of a substance

In general science, periodic table refers to:

A number of protons in the nucleus
B arrangement of elements by atomic number and recurring properties
C pure substance formed by chemical combination of elements in fixed proportions
D vertical column in the periodic table

Which of the following is most closely associated with acetic acid?

A steel containing sufficient chromium for corrosion resistance
B ethanoic acid, CH3COOH
C polymer produced from ethene
D separation of insoluble solids from a fluid using a filter

What is the best description of redox reaction?

A reaction involving oxidation and reduction together
B water containing appreciable calcium or magnesium ions
C CH4, simplest alkane and major natural-gas component
D calcium sulfate dihydrate

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

A substance used to control pests
B an alcohol used in sanitizers, solvents and fuels
C number of protons plus neutrons
D CO2, important greenhouse gas

In general science, fuel refers to:

A elements generally showing conductivity, malleability and ductility
B substance releasing usable energy in combustion or another process
C energy barrier associated with a reaction pathway
D ionic compound of cations and anions

Which statement correctly identifies NPK fertiliser?

A fluoropolymer known for chemical resistance and low friction
B coating iron or steel with zinc
C fertiliser supplying nitrogen, phosphorus and potassium
D temperature at which vapour pressure equals surrounding pressure

What is the best description of valency?

A ethanoic acid, CH3COOH
B gas absorbing and emitting infrared radiation
C combining capacity of an atom or ion
D calcium hypochlorite-based bleaching/disinfecting material

What is the best description of LPG?

A measure related to hydrogen-ion activity/concentration
B liquefied petroleum gas, mainly propane and butane
C reaction involving oxidation and reduction together
D Group 1 metals other than hydrogen

Which statement correctly identifies alloy?

A calcium sulfate hemihydrate
B an alcohol used in sanitizers, solvents and fuels
C CO2, important greenhouse gas
D mixture or solid solution of metals or metal with another element

Which of the following is most closely associated with indicator?

A substance changing colour over a characteristic pH range
B an alcohol used in sanitizers, solvents and fuels
C CO2, important greenhouse gas
D substance used to control pests

Which statement correctly identifies greenhouse gas?

A component that dissolves the solute
B sodium carbonate decahydrate
C separation based mainly on differences in boiling points
D gas absorbing and emitting infrared radiation

What is the best description of solvent?

A iron-based alloy containing carbon
B component that dissolves the solute
C substance releasing usable energy in combustion or another process
D small molecule that can form a polymer

What is the best description of baking soda?

A amount of solute relative to a specified quantity
B CH4, simplest alkane and major natural-gas component
C sodium hydrogen carbonate, NaHCO3
D calcium sulfate dihydrate

In general science, glass refers to:

A gas absorbing and emitting infrared radiation
B ethanoic acid, CH3COOH
C amorphous inorganic solid commonly based on silica
D material supplying plant nutrients

Which statement correctly identifies solution?

A corrosion product formed mainly on iron/steel
B homogeneous mixture of solute and solvent
C solid-to-gas change without passing through liquid
D water containing appreciable calcium or magnesium ions

Which statement correctly identifies pesticide?

A pure substance whose atoms have the same atomic number
B substance used to control pests
C uncharged subatomic particle
D combining capacity of an atom or ion

Which of the following is most closely associated with activation energy?

A measure related to hydrogen-ion activity/concentration
B Group 1 metals other than hydrogen
C positively charged ion
D energy barrier associated with a reaction pathway

What is the best description of quicklime?

A methods such as painting, galvanising or alloying that reduce corrosion
B number of protons in the nucleus
C pure substance formed by chemical combination of elements in fixed proportions
D calcium oxide