Chemical Reactions And Equations Question Preview (ID: 39320)
Types Of Chemical Reactions.
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A process in which one more mor substances change to make a new substance with new properties
a) Physical Change
b) Chemical Change
c) Element
d) Atom
What is an example of a chemical reaction
a) Breaking glass
b) Leaves changing colors in fall
c) Ripping paper
d) Bending a paper clip
What are signs that a chemical reaction has occurred
a) Gas bubbles
b) New substance with different properties
c) Precipitate
d) All of these
Type of reaction in which 2 or more elements combine to forma single more complex compound. A+B yield AB
a) Synthesis
b) Decomposition
c) Single replacement
d) Double replacement
Type of reaction in which a single compound breaks down into parts. AB yield A+B
a) Synthesis
b) Decomposition
c) Single replacement
d) double replacement
Type of reaction in one 1 element is being singled out/replaced AB + C yields AC + B
a) single replacement
b) synthesis
c) decomposition
d) double displacement
Type of reaction in which elements switch places. AB + CD yields AC + BD
a) synthesis
b) double replacement
c) decomposition
d) single replacement
Type of reaction in which energy is released
a) exothermic
b) endothermic
c)
d)
Type of reaction in which energy is taken in
a) exothermic
b) endothermic
c)
d)
Photosynthesis is what type of reaction?
a) exothermic
b) endothermic
c)
d)
Whats on the left side of the chemical equation
a) Reactants
b) Products
c) Yields
d) Subscript
Whats on the right side of a chemical equation?
a) Products
b) Reactants
c) Yields
d) Coefficient
What does the arrow mean in a chemical reaction?
a) Yields
b) The reaction stops
c) Nothing
d) Reactants
Hydrogen and oxygen reactants to form water. Whats the reactants?
a) Hydrogen and water
b) Water
c) Hydrogen and oxygen
d) Hydrogen
Hydrogen and oxygen reactants to form water. Whats the products?
a) water
b) Hydrogen and oxygen
c) hydrogen
d) oxygen
How many hydrogen atoms are in the following formula 2H2O
a) 2
b) 4
c) 1
d) 0
How many Carbon atoms are in the following formula: 3CH4
a) 3
b) 4
c) 1
d) 12
How do you know if a chemical equation obeys the Law of Conservation of Mass?
a) The mass of the reactants are greater than the products
b) It is balanced (mass of reactants = mass of products)
c) The mass of the products are greater
d) you dont
What does a subscript tell you?
a) How many of each atom is in the compound
b) How many compounds you have
c) Nothing
d) Chemical symbol
What is the big number placed in from the formula called?
a) subscript
b) coefficient
c) compound
d) elemenr
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