General Science

What is the best description of litmus?

A acid-base indicator red in acid and blue in base
B solid-to-gas change without passing through liquid
C amount of solute relative to a specified quantity
D corrosion product formed mainly on iron/steel

Which of the following is most closely associated with common salt?

A amorphous inorganic solid commonly based on silica
B compressed natural gas, mainly methane
C sodium chloride
D reaction absorbing heat

Which statement correctly identifies gypsum?

A pure substance whose atoms have the same atomic number
B combining capacity of an atom or ion
C uncharged subatomic particle
D calcium sulfate dihydrate

Which of the following is most closely associated with carbon monoxide?

A negatively charged subatomic particle
B CO, toxic product of incomplete combustion
C anything having mass and occupying space
D chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water

Which of the following is most closely associated with electrolyte?

A substance releasing usable energy in combustion or another process
B small molecule that can form a polymer
C gain of electrons or decrease in oxidation state
D substance producing ions in solution or molten state

What is the best description of neutron?

A polymer produced from ethene
B solid fossil fuel formed largely from ancient plant matter
C steel containing sufficient chromium for corrosion resistance
D uncharged subatomic particle

Which statement correctly identifies period?

A pure substance whose atoms have the same atomic number
B horizontal row in the periodic table
C uncharged subatomic particle
D combining capacity of an atom or ion

Which of the following is most closely associated with atom?

A iron-based alloy containing carbon
B smallest unit of an element retaining its chemical identity
C separation based mainly on differences in boiling points
D component that dissolves the solute

Which of the following is most closely associated with non-metals?

A solid-to-gas change without passing through liquid
B elements generally lacking typical metallic properties
C polyvinyl chloride polymer
D corrosion product formed mainly on iron/steel

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

A elements generally lacking typical metallic properties
B substance changing colour over a characteristic pH range
C reaction releasing heat
D reaction absorbing heat

Which of the following is most closely associated with gypsum?

A calcium sulfate dihydrate
B elements generally lacking typical metallic properties
C substance changing colour over a characteristic pH range
D reaction releasing heat

In general science, hard water refers to:

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

Which of the following is most closely associated with baking soda?

A vertical column in the periodic table
B number of protons plus neutrons
C combination of substances retaining their chemical identities
D sodium hydrogen carbonate, NaHCO3

What is the best description of mole?

A negatively charged ion
B negatively charged subatomic particle
C anything having mass and occupying space
D SI amount-of-substance unit containing Avogadro’s number of entities

What is the best description of acid rain?

A calcium oxide
B temperature at which vapour pressure equals surrounding pressure
C salts of higher fatty acids
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which statement correctly identifies polymer?

A corrosion product formed mainly on iron/steel
B solid fossil fuel formed largely from ancient plant matter
C polyvinyl chloride polymer
D large molecule made of repeating structural units

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

A vertical column in the periodic table
B combination of substances retaining their chemical identities
C number of protons plus neutrons
D reaction involving oxidation and reduction together

What is the best description of fuel?

A negatively charged ion
B negatively charged subatomic particle
C anything having mass and occupying space
D substance releasing usable energy in combustion or another process

Which of the following is most closely associated with NPK fertiliser?

A calcium hydroxide
B fertiliser supplying nitrogen, phosphorus and potassium
C nitrogen fertiliser, CO(NH2)2
D synthetic surfactant used for cleaning

Which statement correctly identifies halogens?

A elements showing intermediate metal/non-metal properties
B acid-base indicator red in acid and blue in base
C arrangement of elements by atomic number and recurring properties
D Group 17 elements

What is the best description of periodic table?

A fertiliser supplying nitrogen, phosphorus and potassium
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C sodium chloride
D arrangement of elements by atomic number and recurring properties

Which of the following is most closely associated with ammonia?

A amount of solute relative to a specified quantity
B calcium sulfate hemihydrate
C NH3, basic nitrogen compound used in fertilisers
D solid-to-gas change without passing through liquid

Which of the following is most closely associated with melting point?

A temperature at which solid and liquid coexist at specified pressure
B calcium sulfate dihydrate
C solid-to-gas change without passing through liquid
D water containing appreciable calcium or magnesium ions

What is the best description of slaked lime?

A negatively charged ion
B negatively charged subatomic particle
C calcium hydroxide
D anything having mass and occupying space

What is the best description of pesticide?

A material supplying plant nutrients
B substance used to control pests
C smallest unit of an element retaining its chemical identity
D gas absorbing and emitting infrared radiation