Unit 1- Chemical Changes and Structure Flashcards
What will affect the rate of a chemical reaction?
- Temperature
- Concentration
- Particle Size
- Catalysts
How does a reaction take place?
Particles must collide with enough energy (Activation Energy)
Temperature (Affect to Rate)
If the temperature increases the particles will have more energy and move faster, therefore increasing the temp increases the rate because the particles collide with more energy
Concentration (Affect to Rate)
If the concentration of the reactant is increased there are more reactants moving in the same space therefore there will be more collisions
Particle Size (Affect to Rate)
In a chemical reaction the outer surface area must react before exposing the inner area of the reactant therefore decreasing the particle size more surface area is exposed and therefore more collisions will occur, faster rate
Catalysts
Catalysts change the rate of a reaction but are not used up. They are a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change
How to Measure Rate?
Rate= Change in Measurable Quantity/Time
Who invented Atomic Theory?
John Dalton
What did Daltons discoveries state?
- Elements are made from tiny particles called Atoms
- All the atoms of one element are identical
- The atoms of one element are different from the atoms of any other element
- Atoms of one element can join with atoms of other elements to form compounds
Definition of Electrons
Negatively charged particles that spin around the atom in circles (energy levels)
Relative mass of nearly zero
Definition of Protons
Positively charged particles found in the nucleus of an atom
Relative Mass of 1
Definition of Neutron
No electric charge - found in the nucleus of an atom
Relative mass of 1
Definition of Atomic Number
How many protons there are in an atom of that element
Can atoms have multiple energy levels
Yes. The first energy level must only hold 2 electrons. Others can hold max 8. This is only true for the first 20 elements
What is group 1 on periodic table?
Alkali Metals
