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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The outermost electron shell is called-
Valence shell
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
Brass is a homogenous mixture or heterogenous mixture
Homogeneous Mixture
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?
How does the number of electron shells change as you move down through the periods?
It increases
What kind of energy must be added for combustion to take place?
Thermal energy (Heat)
Electrons are shared in this type of bond
Covalent bond
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
As you move down a group in the periodic table, what happens to the atomic radius?
It increases
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.
The atomic mass of an element is
Sum pf protons and neutrons
The type of energy that a particle has when it is in motion
It is kinetic energy
How do elements in the same group (column) of the periodic table relate to each other?
They have similar chemical properties