Open Ended
What is a physical change?
Any change that alters (changes) the form or appearance of a substance but does not change it into another substance. Molecules stay the same.
Flammability, reactivity and combustibility are all examples of ______ ________.
Chemical Properties
What is the difference between an endothermic change and an exothermic change?
Endothermic change is when energy is absorbed by the matter involved in a chemical reaction. Exothermic change is when energy is released during a chemical reaction in the form of heat or light.
A change that alters the form or appearance of a material but does not make the material into another substance.
Physical Change
A mixture containing a solvent and at least one solute that has the same properties throughout; a mixture in which one substance is dissolved in another.
Solution
What are two ways that matter can undergo a physical change?
Cutting, bending, etc.
Chemical reactions occur when bonds of molecules ____ and the atoms _____ to make new molecules.
Is a solution a physical change or a chemical change?
Physical Change
A change in which one or more substances combine or break apart to form new substances.
Chemical Reaction
The part of a solution that is usually present in the largest amount and dissolves a solute.
Solvent
What are three signs of a chemical reaction that we learned about?
Formation of a precipitate, production of a gas and color change.
During a ______ _______, the original substance transforms into a new substance after the reaction.
Chemical Reaction
Hydrogen gas and oxygen gas combine to make water. Which are the products and which are the reactants?
Reactants: Hydrogen and Oxygen
A substance that enters into a chemical reaction.
Reactant
The part of a solution that is dissolved by a solvent.
Solute
When you dissolve salt into water to make saltwater, which is the solvent and which is the solute?
Solute: Salt
Solvent: Water
A _______ __________ is a way to show a chemical reaction using symbols instead of words.
A substance formed as a result of a chemical reaction.
What happens to the molecules during a physical change and during a chemical reaction?
During a physical change the molecules stay the same. During a chemical reaction molecules rearrange to form a new substance.
A _____ _______ describes matter and can be determined without destroying the substance.
Physical Property
Two or more substances that are together in the same place but their atoms are not chemically bonded.
Mixture