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Intro to Chemistry 5.1 Quiz Review
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A ___ change does not produce new substances.
Physical
During a ___ change, new substances form.
Chemical
The starting substances and the substances produced have different physical and chemical ___.
Properties
A chemical reaction is a process in which atoms of one or more substances rearrange to form one or more new ___.
Substances
Sometimes, changes in ___ properties, such as color or odor, indicate a chemical reaction.
Physical
A solid formed when two liquids are mixed is called a ___ and can be evidence of a chemical reaction.
Precipitate
A change in energy is another sign that a ___ has occurred.
Chemical reaction
___ is absorbed or released during a chemical reaction and is evidenced by warming or cooling.
Thermal energy
The only way to be certain a chemical reaction has taken place is to compare the chemical properties of the substances ___ the change
Before and after
During a chemical reaction, atoms of elements or compounds ___ and form new elements or compounds.
Rearrange
Atoms rearrange when chemical ___ between atoms break.
Bonds
A ___ is a description of a reaction using element symbols and chemical formulas.
Chemical equation
Element symbols represent ___.
Elements
When an element exists as a diatomic molecule, the element symbol is followed by the subscript ___.
2
Chemical formulas represent ___.
Compounds
A chemical formula contains ___ and ___ to describe the makeup of a compound.
Element symbols and subscripts
When chemical formulas differ, they represent different ___.
Substances
A chemical equation includes the substances that ___ and the substances ___.
React, formed
___ are the starting substances in a chemical reaction.
Reactants
___ are the substances produced by a chemical reaction.
Products
True or False: In a chemical equation, the reactants are written to the left of an arrow, and the products are written to the right of the arrow.
True
Two or more reactants are separated by ___ signs, as are any two or more products.
Plus
The ___ states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
Law of conservation of mass
Mass is conserved in a chemical reaction because ___ are conserved.
Atoms
To show that mass is conserved, a chemical equation must show that the number of each type of atom must be ___, or the same on both sides of the equation.
Balanced
Chemical equations are balanced by adding ___.
Coefficients
Is this equation balanced?
No
Is this equation balanced?
Yes
Is this equation balanced?
No
A ___ is a number placed in front of an element symbol or a chemical formula in an equation.
Coefficient
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