Chemistry Review Flashcards
(54 cards)
Which of the following is an example of a chemical change?
a) Cutting grass b) rusting a nail c) percolating coffee d) clothes drying on a line.
b) rusting a nail
To find the number of neutrons in an atom, you must: a) add the atomic number and the atomic weight b) subtract the atomic number from the group number. c) subtract the atomic number from the atomic weight d) subtract the electric charge from the group number
c) subtract the atomic number from the atomic weight
The particles that are gained or lost by atoms when they react are: a) electrons b) protons c) neutrons d) ions
a) electrons
The staircase on the Periodic Table in important because it separates: a) ionic bonds from covalent bonds b) electrons from protons c) acids from bases d) metals from non-metals
d) metals from non-metals
Two elements that are likely to form a covalent bond when they react are: a) hydrogen and fluorine b) carbon and nitrogen c) magnesium and sulphur d) potassium and helium
b) carbon and nitrogen
The element which is MOST likely to form an ionic bond with oxygen is: a) boron b) magnesium c) hydrogen d) potassium
d) potassium
In the formula C3H8, there are: a) 3 carbon and 8 hydrogens b) 1 C 3+ ion and 1 H 8+ ion c) 3 carbons and 8 heliums d) 8 carbons and 3 hydrogens
a) 3 carbon and 8 hydrogens
The element which reacts MOST vigourously to lose electrons is: a) hydrogen b) francium c) aluminum d) polonium
b) francium
The non-metal which is BEST at stealing electrons from other atoms is: a) boron b) astatine c) fluorine d) radon
c) fluorine
In order to make a positive ion, an atom must: a) gain a proton b) lose a proton c) gain an electron d) lose an electron
d) lose an electron
Which of the following names is written correctly? a) sodium chlorine b) Sodium chloride c) Sodium Chloride d) Sodium chlorine
b) Sodium chloride
Which property of water causes its unusually high boiling point? a) It has heavy particles b) It can dissolve salt c) It is a polar molecule with + and - ends. d) It expands when it freezes.
c) It is a polar molecule with + and - ends.
Which of the following formulas represents a compound that can actually exist? a) HO2 b) C2O3 c) SiO2 d) MgHe2
c) SiO2
Ionic Bonds are formed when: a) two atoms of roughly the same strength share valence electrons b) a metal gains electrons from a non-metal to get six valence electrons in total c) a group 8 atom shares + ions with a non-metal to bond d) a strong non-metal takes electrons from a metal making + and - ions that bond.
d) a strong non-metal takes electrons from a metal making + and - ions that bond.
Covalent (or molecular) compounds are easily distinguished from ionic crystals by the fact that: a) ionic crystals are softer b) Ionic solutions conduct electricity while covalent solutions don’t c) ionic crystals are easy to melt d) covalent crystals have 6 sides while ionic crystals have 8 sides
b) Ionic solutions conduct electricity while covalent solutions don’t
When a clear, colourless, odourless gas is produced by a chemical reaction, you can test its identity using a burning wooden splint. You will know the gas is hydrogen if: a) it puts out the flames b) the gas explodes with a “pop” c) the glowing splint bursts back into flame d) the flame burns green and smells like chlorine
b) the gas explodes with a “pop”
Which of the following is a chemical change? a) crushing a sugar cube b) melting an ice cube c) dissolving salt in water d) reacting Zn with HCI to give H2 gas
d) reacting Zn with HCI to give H2 gas
An unidentified element is yellow, brittle, and does not conduct electricity. It is probably: a) a metal b) radioactive c) a non-metal d) unclassifiable
c) a non-metal
Metalloids are: a) used by aliens to build space ships b) are always ductile and are not solid at room temperature c) solids, dull and good conductors of heat and electricity d) solids that may be shinny or dull, may conduct but are not ductile
d) solids that may be shinny or dull, may conduct but are not ductile
Which of the following is NOT a property of metals? a) malleability (can be shaped/bent) b) ductility (can be stretched) c) lustre (can be shined) d) brittleness (breaks easily)
d) brittleness (breaks easily)
Which of the following used to organize the modern Periodic Table? a) atomic number b) atomic mass c) atomic size d) state at room temperature
a) atomic number
In a chemical reaction: a) total mass stays the same b) total mass is gained as electrons are transferred c) mass is lost as it changes to energy d) total mass is lost as protons are transferred
a) total mass stays the same
Which atom or ion has the same number of electrons as the chloride ion (Cl -1)? a) Ne b) Cl c) K + d) N 5+
c) K +
An element that can replace the S in K2S
Oxygen
