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What is not a property of ionic compounds?
When they dissolve in water, all the ions create a solution and will not conduct electricity
At room temperature they are usually hard, brittle solids that can be crushed
Their positive and negative ions arrange into sheets, forming crystals
All of the ions are attracted to each other within the compound, and therefore they have very high melting points
An unknown compound was found to break into small crystals that could be ground into a powder. When the powder was stirred into water, it dissolved and the solution conducted electricity very well. What is the unknown compound likely to be?
Ionic compound
Element
Covalent compound
Mechanical mixture
What is the proper name for the ion Pb4+?
Lead(IV)
Lead
Lead(II)
Lead(II, IV)
As an experiment, you decide to try to create an ionic compound that uses your two favourite elements, magnesium and neon. Before you start your lab partner gives you some correct advice. What did she say?
“Magnesium and neon cannot form an ionic compound because neon is a noble gas and does not form compounds very easily.”
“Magnesium is a multivalent element, so make sure you choose the right ion before we go any further.”
“Magnesium and neon don’t form an ionic compound, they form a covalent compound.”
“Magnesium and neon are both metals, so they can’t form an ionic compound together.”
What is a polyatomic ion?
A group of atoms that act like a single ion
Any atom that can exist in more than one ion form
A non-metal atom that can exist in more than one ion form
A metalloid atom that can exist in more than one ion form
A lithium battery, shown here, can produce twice the voltage of a zinc battery.
Why is this so?
Lithium is more reactive so it can produce more electrical energy
Lithium is less reactive so it can produce more electrical energy
Lithium is more reactive so it can produce more chemical energy
Lithium is less reactive so it can produce more chemical energy
Sodium metal and chlorine gas react to form the ionic compound sodium chloride (NaCl).
What best describes how sodium metal and chlorine gas react to form NaCl?
Sodium transfers an electron to chlorine - the oppositely charged ions attract each other
Chlorine transfers an electron to sodium - the oppositely charged ions attract each other
Chlorine transfers an electron to sodium - the like charged ions attract each other
Sodium transfers an electron to chlorine - the like charged ions attract each other