Science Exam 3.0 Flashcards
Types of reactions
- synthesis reaction
- decomposition reaction
- displacement reaction
What is a chemical reaction??
A chemical reaction is a process where a set of substances undergo a chemical change to form a different substance
What is a synthesis reaction??
Synthesis reaction is one where two substances combined to make a new substance. It can be shown in an equation such as A+B=AB.
What is decomposition reaction??
A decomposition reaction is where a complex substance breaks down to form two separate substances. It can be shown in an equation such as AB= A+B
What is displacement reaction??
A displacement reaction is where elements or compounds are displaced to make new substances
Examples of synthesis reaction
Water: 2H2 + O2= 2H2O
Carbon dioxide: 2CO + O2= 2CO2
A+B=AB
Examples of decomposition reaction
CaCO3= CaO + CO2
AB= A+B
2KCIO3= 2KCI + 3O2
Examples of displacement reaction
AC+BD=AB+CD
Mg+2HCI=MgCI+H2
What is a mixture?
A mixture is a combination of two substances or more
Types of mixtures
Homogeneous and heterogeneous mixtures
What is an homogenous mixture??
Is a mixture where the components are not visible
What is heterogeneous mixture??
A mixture where the components are visible sometimes
Homogeneous examples
Soda medicine cupcake etc.
Heterogeneous examples
Salad pizza taco soup etc.
Separation methods
For homogeneous mixtures distillation and evaporation
For heterogeneous mixtures evaporation filtration decantation magnetic separation
Distillation
Is the technique of heating a liquid to create vapor which is collected
Evaporation
The process by which molecules undergo a spontaneous transition from liquid to gas
Filtration
Is a mechanical or physical process to separate solid from Fluids particulates
Decantation
Separate particulates from a mixture by allowing the solids settle to the bottom
Magnetic separation
Is a process in which magnetically material is extracted from a mixture using magnetic force
What is force??
We understand force as a Vector which is a physical quantity with size and direction
The forces are
Friction gravity normal force tension muscular force
Friction
In which a moving object can be slow down by air water or any surface the object moves upon
Gravity
In which a mass is attracted to another
Normal force
Made by any surface on objects standing on it
Tension
Which is the force a rope makes when it’s tensioned
Muscular force
The force made by muscles when an exercise is done
Speed
A vector representing a change of position
Reaction
The opposite force to any action
Dynamometer
The instrument to measure force
Direction
Where a vector goes
Friction
The force that creates resistance between surfaces
Action
The force that acts up on itself
Acceleration
Vector representing changes of speed
Newton’s first law
An object in move stays at move unless an outside force acts upon it
An object in rest stay at rest unless an outside force acts upon it
Newton’s second law
To move a mass you need a force
F=ma
Newton’s third law
Every action has an equal and opposite reaction
What is inertia
Inertia is a property of matter
