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semester exam unit 3

semester exam

QuestionAnswer
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you? There are two bromide ions for every magnesium ion.
Each family (or group) in the periodic table has its own characteristic properties based on the number of valence electrons.
An ionic bond is the attraction between oppositely charged ions.
ions that are made of more than one atom are examples of polyatomic ions.
Which of the following is a characteristic property of ionic compounds? They form hard, brittle crystals with characteristic shapes.
In what form can an ionic compound conduct electricity?when dissolved in water when dissolved in water
A chemical bond formed when two atoms share electrons is called a(n) covalent bond.
What is a double bond? What is a double bond?
Which is a property shared by most molecular compounds? low melting point
Molecular compounds do not conduct electricity because they do not break up into ions.
A covalent bond in which electrons are shared unequally is polar.
Electrons involved in bonding between atoms are valence electrons.
If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have 8 valence electrons.
Ionic compounds are electrically neutral.
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is equal
Bonds that form between two nonmetal atoms usually are ____________________ bonds. positive
Elements in Group 1 lose one electron to form ions with a(n) ____________________ charge. molecular
When an ionic compound forms, the total number of positive charges and the total number of negative charges must be zero
A(n) ____________________ compound is a compound that consists of molecules made of atoms that are covalently bonded. covalent
What type of reaction is FeS + 2 HCl ® FeCl2 + H2S? a double replacement reaction
Which of the following is NOT a correct inference that you can make about the burning of gasoline? The reaction is a physical change.
CaCO3 represents a chemical formula.
The only sure evidence for a chemical reaction is the production of one or more new substances.
A shorter, easier way to show chemical reactions, using symbols instead of words, is called a chemical equation.
The substances listed on the left side of a chemical equation are the reactants.
Which of the following is a balanced chemical equation? 2 Fe2O3 + 3 C ® 4 Fe + 3 CO2
Which two processes could be considered opposites? a synthesis reaction and a decomposition reaction
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a decomposition reaction.
A chemical reaction that absorbs energy in the form of heat is described as endothermic.
Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction? adding a catalyst
A material used to decrease the rate of a chemical reaction is a(n) inhibitor.
Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide. 2 Na + O2 ® 2NaO
The principle of conservation of mass is true for reactions in both open and closed systems.
In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the number of molecules or atoms of each substance in the reaction.
Every chemical reaction involves a change in energy.
Chemicals that act as biological catalysts by speeding up reactions in living things are enzymes.
In a chemical equation, a(n) ____________________ tells you how many atoms or molecules of a reactant or a product take part in a reaction. chemical formula
A chemical reaction that releases energy in the form of heat is a(n) ____________________ reaction. coefficient
The _________________________ of a compound shows the ratio of elements present in the compound. decomposition
In a(n) ____________________ reaction, the products are simpler substances than the reactant. exothermic
Created by: jay mcanally
 

 



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