What is the right part of a chemical equation called...2H2 + O2 --> 2H2O
Reactants
Products
Yields
Chemical Equation
Q.2.
What is the left part of a chemical equation called?2H2 + O2 --> 2H2O
Reactants
Products
Yields
Chemical Equation
Q.3.
In a ___________change, a substance changes into a different substance.
Physical
Chemical
Q.4.
What is the BEST definition of a chemical reaction?
A change in matter that produces one or more NEW substances
When two things combine and EXPLODE.
Q.5.
What type of change occurs when a new substance is formed that has different properties from the original substances?
chemical change
nuclear change
physical change
mutation
Q.6.
Which of the following IS a physical change?
Getting a haircut
Rusty metal
sour milk
A compound
Q.7.
Which one shows that a chemical reaction has occurred?
dissolving
melting
formation of a gas
bending
Q.8.
A change in the shape of an object is an example of _________________.
a chemical change
energy
an endothermic change
a physical change
Q.9.
Which of the following is an example of a chemical change?
water freezes to form ice
sugar dissolves in water
gasoline burns in a car engine
a piece of metal expands when it is heated
Q.10.
A substance that is formed as the result of a chemical reaction is a __________________
Product
Reactant
Starters
Enders
Q.11.
What type of reaction is illustrated below?Zn + H--> ZnS + H2
synthesis
decomposition
single replacement
double replacement
Q.12.
Which statement is not a description of a chemical reaction?
A solid is dropped into a beaker of liquid and a gas is released.
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
A solid is dropped into a beaker of liquid and an explosion occurs.
A liquid is heated in the sun and half of it evaporates.
Q.13.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Coefficient
reactant
subscript
product
Q.14.
A chemical reaction that absorbs heat
Single replacement
Exothermic
Endothermic
Decomposition
Q.15.
In a chemical reaction
The atoms of the reactants always stay together to form the products
The atoms of the reactants unbond, rearrange, and then rebond to form the products
New atoms are formed which combine to make the products
Some atoms disappear while others multiply to form the products
Q.16.
If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
4CO₂ + 3H₂O
3CO₂ + 4H₂O
2CO₂ + 3H₂O
3CO + 4H₂O
Q.17.
Which of the following answers will balance the equation below?__K + __Br2 --> __KBr
2, 1, 1
2, 3, 2
2, 1, 2
1, 2, 3
Q.18.
What type of reaction is illustrated below?FeS + Hal --> H+ FeCl
synthesis
decomposition
single replacement
double replacement
Q.19.
A chemical change is different than a physical change because in a chemical change
Chemicals are used
Molecules do not physically touch
A new substance is formed and in a physical change no new substance is formed
The change can be seen but in a physical change it cannot
Q.20.
True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.
True
False
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