Q.1
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
0 h : 0 m : 1 s