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What makes a pure substance?
elements and compounds
When atoms join together they make...
molecular structures and giant structures
Nonmetals + Nonmetals=
Covalent Bonds
metal+ nonmetal=
Ionic bonds
what makes a metallic bond? _______ + ______
metal + metal
True or False. Molecules are made of atoms help together by very strong forces of attraction called Ionic bonds.
False. Covalent Bonds
Which of the following is an example of an Ionic bond: A) NaCl B) CO2 C) Fe
A) NaCl - sodium chloride
Correct the statement: Ionic crystals are sollid with low melting points and freezing points.
Ionic crystals are solid with HIGH melting points and BOILING points.
True or False Covalent crystals are soluble in water.
False Insoluble
What is a giant structure?
A group of large number of atoms
Ionic crystals do not conduct electricity in their solid state but DO so when _____ and _____
melted and in solution
Correct the statement: amorphous are structures that have an ordered arrangement
Crystals are structures that have an ordered arrangement
What type of crystals give up their atoms electrons to the crystal network, forming positive ions?
Metallic crystals
What type of bond is this?
Ionic bond
What type of bond is this?
Covalent Bond
What type of bond is this?
Metallic Bond
