Atomic Structure And Chemical Reactions Question Preview (ID: 42252)
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A substance containing two or more elements chemically bonded together:
a) Mixture
b) Atom
c) Alloy
d) Compound
When a chemical change occurs:
a) Atoms are rearranged
b) The law of conservation of mass is always obeyed
c) The chemical properties of new substances are different from the ones you started with
d) All of the above
The principle of conservation of mass is satisfied in a chemical equation when:
a) The same number of each type of molecule appears in the reactants and products
b) The same number of each type of atom appears in the reactants and products
c) The sum of the coefficients on the reactant side is the same as the product side
d) Each atom on the product side has the same subscript that it had on the reactant side
What is the coefficient for sodium hydroxide: 2NaOH
a) 0
b) 1
c) 2
d) 4
Where is the subscript located?
a) Below an element symbol
b) Before a compound's formula
c) Above an element symbol
d) After a compound's formula
Where are the reactants located?
a) Left side of the equation
b) Right side of the equation
c) The arrow represents reactants
d) Below each element symbol
Where are the products located?
a) The right side of the equation
b) The left side of the equation
c) The arrow represents the products
d) Before each compound's formula
What compound is represented as C6H12O6
a) Sugar or glucose
b) Water
c) Salt
d) Sand
A reaction is exothermic if forming new bonds:
a) Requires more energy than it tool to break the old bonds
b) Takes the same amount of energy as was needed to break the old bonds
c) Absorbs energy from the system, causing a temperature drop
d) Releases more energy than it took to break the old bonds
When you activate an instant cold pack, water mixes with a chemical and the pack gets very cold. This is an example of an:
a) Endothermic reaction
b) Exothermic reaction
c) Combustion reaction
d) A physical change
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