Types of Reactions
Using heat to break down a substance into smaller substances is what type of reaction.
Thermal Decomposition
Describe a test for hydrogen gas.
Flame test (squeaky pop)
What is the smallest particle you can see through a microscope.
The Atom
Give an example of a synthesis reaction
oxygen gas + hydrogen gas = water
sodium + chlorine = sodium chloride.....
Give 2 examples of thermal decomposition
cooking food / lime production / baking soda
Name this type of reaction?
2 Zinc + O2 > 2 ZnO
Oxidation / Combustion / Synthesis
Describe a test for oxygen gas
Flame test (flame gets bigger)
What are the 3 sub-atomic particles?
Protons (+), Neutrons (0), and Electrons (-).
Deescribe the metal reactivity series
A list of metals based on reactivity.
Which two isotopes were infamously used in the "Fatman" and "Little Boy"
Uranium - 235
Plutonium - 239
Which halogen is the most reactive? Why?
Flourine - It has the smallest volume / valence shell closest to nucleus.
Describe the difference between a compound and a mixture.
Compound is a molecule made of different atoms, with unique properties, whereas a mixture are many different compounds mixed together with their original properties.
Which of the 3 sub-atomic particles determines the reactivity of an element?
Electrons.
Is creating bonds and endothermic reaction or exothermic?
Endothermic
What is meant by the term "chemical potential energy" and give 2 other types of energy.
Energy stored in bonds / substance.
Mechanical / Kinetic / Sound
Internal Energy / Heat
elastic, electromagnetic, gravitational, nuclear
Name 3 double displacement reactions
respiration, photosynthesis, combustion of hydrocarbon, neutralization
Describe metallic bonding
Positive ions trapped in a sea of free moving electrons (valence electrons)
What is meant by the term "isotope".
an element with a specific mass number.
EX) C-12 (stable), C-14 (radioactive)
U-238 (stable), U-235 (radioactive)
In the thermite reaction an initial energy input is required. Why?
Energy is needed to first seperate the ions from the reactants so the reaction can start / not enough activation energy
Where does nuclear energy come from?
NUCLEUS
OF
ATOMS
!!!!!!!!!!!!!!!!!!!!!
Type of reaction?
Energy Transfer?
Electron Transfer?
2Al + Fe2O3 -> Al2O3 + 2Fe
Thermite / Single replacement
Exothermic
Redox Reaction
Describe the 3 different types of bonding.
Metallic = ions in sea of electrons
Covalent = non metals sharing valence electrons
Ionic = Atoms giving or taking electrons creating static electricity.
Of the four fundamental forces:
Strong Nuclear, Weak Nuclear, Gravitational, Electromagnetic
Which is responsible for opening a door?
Electromagnetic
If a cube increases the length of a side by a factor of 4 (x4), what happens to the SA:V ratio of the cube.
SA:V ratio is 4 times smaller.
Who is the most powerful marvel hero? Only one correct answer (EVIL LAUGH)
The Hulk (gamma irradiated)