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WorksheetsChemical Equations and Reactions
Total questions: 26
Worksheet time: 52mins
This type of bond forms between nonmetal atoms when they share electrons
Ionic bond
Covalent bond
metallic bond
This type of bond is an attraction that holds negative and positive ions together.
ionic bond
covalent bond
metallic bond
These bonds form when metallic atoms pool their electrons. Electrons are able to move freely among the positive metal ions.
ionic bonds
covalent bonds
metallic bonds
Electrons in the outermost energy level are called
satellite electrons
outer electrons
valence electrons
In a chemical formula, this number is used to represent the number of each atom being represented.
Exponent
Coefficient
Molecule
Subscript
Two or more atoms bonded together
Molecule
Compund
Subscript
Coefficient
This number appears before a chemical formula. It represents how many molecules there are.
Subscript
Coefficient
Molecule
Atom
When an atom gains or loses an electron, it becomes...
an isotope
radioactive
an ion
a molecule
When two or more substances combine to form a new substance with new properties.
physical change
chemical change
A change that occurs when matter changes shape or state of matter. This does not change the material into a new substance.
physical change
chemical change
The things that exists AFTER the reaction are called
reactants
products
The things that exist BEFORE the reaction are called
Reactants
Products
Is this reaction balanced or unbalanced?
C3H8 + O2 -> H20 + CO2
balanced
unbalanced
Endothermic reactions...
release energy
absorb energy
Exothermic reactions
release energy
absorb energy
Is this a chemical or physical change: Two substances were combined together and immediately, a gas was produced and the color changed to yellow.
chemical change
physical change
Is this a chemical or physical change: one substance was exposed to heat and changed from solid to liquid.
physical change
chemical change
Is this reaction balanced or unbalanced?
C3H8 + 5O2 -> 4H20 + 3CO2
balanced
unbalanced
How many valence electrons does Chlorine have?
1
17
7
8
How many valence electrons does Carbon have?
1
2
3
4
Two substances each have a temperature of 20 degrees Celsius. After they are combined the temperature rises to 27 degrees Celsius. Was this a chemical or physical change?
physical change
chemical change
The Law of Conservation of Mass says....
an object in motion will stay in motion unless acted upon by a force
an object at rest will stay at rest unless acted upon by a force
mass cannot be created or destroyed, but it can change forms
mass = force x gravity
What kind of reaction is this: Na + Cl → NaCl
single displacement
double displacement
synthesis
decomposition
What kind of reaction is this: HCl + KI → HI + KCl
single displacement
double displacement
synthesis
decomposition
What kind of reaction is this: 3CuCl2 + 2Al → 2AlCl3 + 3Cu
single displacement
double displacement
synthesis
decomposition
Which of these is NOT a sign of a chemical change:
color change
unexpected temperature change
phase change
gas/bubbles/odor
