Chemistry Basics
Focus of study for chemistry
What is the study of composition of matter and the changes it undergoes?
The simplest form of matter that has unique properties
What is an element?
Density is the property that represents the relationship of...
The type of change that occurs when ice melts
What is a physical change?
The name of the substances that are present before a chemical reaction takes place
What is a reactant?
John Dalton's contribution to chemistry
What is atomic theory?
A mixture that is of uniform composition (also provide an example)
What is homogenous mixture
Any solution for an example (gatorade, etc.)
The three phases of matter
What is Solid, Liquid, Gas
The main difference between a physical change and a chemical change
What is...
A physical changes does not form a new substance
A chemical change does form a new substance
What is a reaction that releases heat energy to its surroundings?
The person who introduced the concept of the molecules and described gas behavior mathematically
Who is Robert Boyle?
The smallest unit of an element
What is an Atom?
What is...
Entropy increases
Enthalpy increases
A change that occurs when wood is burned
What is a chemical change?
The activation energy in a chemical reaction is
What is the minimum energy required for a reaction to occur?
A scientist that discovered gases like oxygen
Who is...
Joseph Priestly
C.W. Scheele
Antoine Lavoisier
A technique used to separate components based on their movements at different rates through a medium
What is Chromatography?
The benefit of using a graph that has multiple densities of substances graphed on it
What is...
Comparing densities of substances to see which element is more dense?
Calculating densities of substances to identify them using a reference sheet?
Two possible indicators of a chemical change...
What is...
Color change
Gas Production
Temperature change
Formation of a precipitate
Light
New substance
The ΔE in an endothermic reaction is
(must also explain how the ΔE causes the temperature change)
What is a positive change in ΔE?
This causes a cooling effect because energy is taken from the surroundings into the substance that is going through the chemical change.
The number that is used to describe the amount of particles in 1 mole of a substance.
What is...
Avogadro's Number
6.02 X 1023
A compound and molecule differs in the aspects of...
What is...
Compounds consist of two or more different elements chemically combined
Molecules consist of two or more of the same elements chemically combined
The difference between enthalpy and entropy
What is...
Enthalpy is the energy of particles?
Entropy is the randomness or disorder of particles?
The law of conservation of mass states
What is the total mass of reactants must equal the total mass of the products during a chemical reaction?
(must explain what enthalpy is and how it is different in both exothermic and endothermic reactions)
What is...
Enthalpy is the amount of energy in a substance
Endothermic reactions have an increase in enthalpy
Exothermic reaction have a decrease in enthalpy