General Science

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

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