#2 Power of Energy Flashcards
Changes & Energy (30 cards)
3 types of physical changes
1) phase change
2) Dissolution
3) déformation
What is deformation
Changing the shape or form of an object or material
What is a physical change
Does not change the nature of a substance
What is a chemical change
Affects the nature and characteristic properties of matter. Chemical changes are brought about by chemical reaction, where chemical bonds in the reactant molecule are rearranged to form a new product molecule.
What does the law of conservation of mass state
Mass can neither be created nor destroyed, it is only transformed. Therefor, the total mass of the reactant is always equal to the total mass of the products in any chemical reaction.
Parts of a chemical reaction
Reactants/reagents and products
What happens to the number of atoms during a chemical change
The number of atoms stays the same
5 clues of a chemical change
1) release of a gas (bubbling)
2) permanent colour change
3) release of light
4) release or absorption of heat
5) formation of precipitation
4 types of chemical changes
1) Synthesis
2) Decomposition
3) Oxidation
4) Precipitation
What is synthesis
Two or more reactants combine to form a new product. 2H2 + O2 — 2H20
What is decomposition
A compound is broken down into two or more substances. 2H20 —- 2H2 + 02
What is oxidation
A reaction where a substance combines with oxygen. 4Fe + 30 —- 2Fe203
What is precipitation
Two solutions react, forming an insoluble product. (aq)
What is energy
Is the capacity to do work or to effect change
What is transformation of energy
It’s the changing of energy from one form to another.
What is energy transfer
The movement of energy from one location to another.
4 principal energy forms
1) thermal energy
2) radiant energy
3) chemical energy
4) mechanical energy
What is thermal energy
Energy associated with the movement of the particles making up a substance. The higher the temperature, the more thermal energy. Sun, fire
What is Radiant energy
Energy contained in and transported by electromagnetic wave. Sun, microwaves, x-rays
What is chemical energy
The energy stored in the chemical bonds of a molecule. Food, glucose
What is mechanical energy
Energy due to the motion of an object. The greater the speed and the mass = greater mechanical energy.
Nuclear energy
Elastic energy
Hydraulic energy
-Energy stored in the nucleus of an atom
- stored due to compression or extension
-Energy from moving water
Unit of measurement of energy
Joules = J
Kilojoules = 1000J
What is temperature
A measure of the degree of agitation of the atoms-molecules making up a substance
