Chemical Reaction I
The atomic number of an element is its
Number of protons
Difference between physical and chemical change
during a physical change, the substance stays the same; during a chemical change, a new substance forms
A metal and non-metal form this type of compound
It is a ionic compound
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Free 100 points🙂
What do most chemical reactions need in order to proceed from start to finish?
An ignition source
Rust forms when metal (iron/steel) comes into contact with water or moisture and oxygen
A chemical reaction
An increase in temperature will usually cause the rate of reaction to
Increase
In a closed system there should be no change in what?
Mass
What type of reaction is this A + B = AB
Synthesis Reaction
(Double points)
Give an example of a molecule
H20,H2,O2,N2
Which one of the following is a chemical change, NOT a physical change: splitting wood, melting ice, burning wood
Burning wood
Color, texture, bending, tearing, melting, boiling, dissolving are all examples of this
words that indicate a physical change
State the Law of Conservation of Mass
Matter can not be created or destroyed in a chemical reaction
Cooking, bubbles occur, formation of gases, temperature changes, corrosion, tarnishing are examples of this
words to look for to determine if a chemical reaction occurs?
When balancing an equation, this can not be changed.
The subscript
What kind of energy must be added for combustion to take place?
Thermal energy (Heat)
What type of reaction is this CaCo3(s) -> CaO(s) + CO2(g)
Decomposition
A reaction that releases energy is called this.
exothermic reaction
A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat
Combustion Reaction
An increase in temperature will usually cause the rate of pressure to
Increase
how is CO different from CO2
CO2 has 2 oxygens while CO has only 1
Give three examples that a chemical change has taken place
temp. change, color change, odor change ect.
What is type of reaction is 2Na+Cl2 -> 2NaCl
Synthesis reaction
The type of energy that a particle has when it is in motion
It is kinetic energy
What is the 55th element
crip mack