Unit 1- Chemical Changes and Structure Flashcards Preview

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Flashcards in Unit 1- Chemical Changes and Structure Deck (19):
1

What will affect the rate of a chemical reaction?

1. Temperature
2. Concentration
3. Particle Size
4. Catalysts

2

How does a reaction take place?

Particles must collide with enough energy (Activation Energy)

3

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

4

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

5

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

6

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

7

How to Measure Rate?

Rate= Change in Measurable Quantity/Time

8

Who invented Atomic Theory?

John Dalton

9

What did Daltons discoveries state?

1. Elements are made from tiny particles called Atoms
2. All the atoms of one element are identical
3. The atoms of one element are different from the atoms of any other element
4. Atoms of one element can join with atoms of other elements to form compounds

10

Definition of Electrons

Negatively charged particles that spin around the atom in circles (energy levels)
Relative mass of nearly zero

11

Definition of Protons

Positively charged particles found in the nucleus of an atom
Relative Mass of 1

12

Definition of Neutron

No electric charge - found in the nucleus of an atom
Relative mass of 1

13

Definition of Atomic Number

How many protons there are in an atom of that element

14

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

15

What is group 1 on periodic table?

Alkali Metals

16

What is group 2 on periodic table?

Alkaline Earth Metals

17

What is group 3-11?

Transition Metals

18

What is group 18 on periodic table?

Noble gasses

19

What is group 17 on the periodic table?

Halogens