Quiz 2 (5-7) Flashcards
(26 cards)
Define endothermic
The system absorbs heat from its surroundings, increasing its potential energy. It would feel cool to the touch.
Define exothermic
The system releases heat from the surroundings, so the potential energy of the system decreases. It would feel hot to the touch.
Is endothermic positive or negative?
Positive
Is exothermic positive or negative?
negative
Define solvent:
The substance that dissolves a solute
Define solution:
A mixture where one substance dissolves completely in another substance. The solute dissolves in the solvent.
Define soluble:
A substance that can dissolve in a solvent to form a solution
Define Solute:
A substance that gets dissolved in a solution
Define insoluble:
A substance that cannot dissolve in a particular solvent
Define precipitation reaction:
A type of chemical reaction where two solutions are mixed and an insoluble solid forms, called a precipitate which separates from the solution.
Define precipitate:
The solid that forms and separates from a solution during a chemical reaction.
Define residue:
Remaining substance that is left behind after a process. It can be evaporation, filtration, etc.
Define suspension:
A mixture where small solid particles are mixed with a liquid or gas but do not dissolve.
Define filtration:
The process is used to separate solid particles from a liquid or gas by passing the mixture through a filter.
What is the difference between melting and dissolving?
Melting is the process by which a solid turns into a liquid when heated whereas dissolving is the process by which a substance mixes with a liquid to form a solution. Melting involves a change of state and dissolving involves mixing.
What is the difference between a liquid and a solution?
Liquid is a state of matter where molecules are close together and move freely. Solution is a specific type of liquid mixture, where one substance is completely dissolved in another.
when two or more simple substances join together to make something more complex.
Synthesis reaction
A type of chemical reaction where a substance (usually a fuel) combines with oxygen to produce energy in the form of heat and light. It’s burning!
Combustion reaction
One compound breaks down into two or more simpler substances. (AB–>A + B)
Decomposition reaction
A type of reaction where one element replaces another in a compound.
Displacement reaction
Two elements in different compounds swap places.
Double displacement
What type of reaction is H2 + O2 –> H2O?
synthesis
What type of reaction is
CaCO3—>CaO + CO2?
Decomposition
What type of reaction is
Zn + 2HCI—>ZnCl2 + H2
Single displacement
