December Chemistry Flash Cards
What is a Compound?
A pure substance whose smallest unit is made up of atoms of MORE than one type of element.
What is Heterogeneous Mixture?
TWO or more substances that are together but do NOT combine chemically to form a new, pure substance.
A mixture with VISIBLE components and does not look the same throughout.
What is Homogeneous Mixture?
A mixture that appears the same throughout
Is sugar a compound or an element?
Compound
Is Chili Heterogeneous mixture or Homogeneous mixture?
Heterogeneous
Is Mild a Heterogeneous or Homogeneous mixture?
Homogeneous
During a phase change, the temperature of a substance ________.
Varies
What is Volume?
Anything that takes up space and has mass.
What is Plasma?
The 4th State of Matter
It is NOT common on Earth
What is Solid?
Definite shape and volume, particles are packed very closely.
What is Liquid?
Matter with a definite volume but o definite shape.
What is Surface Tension?
Uneven forces acting on the particles of a liquids surface.
What is Chemical Reaction?
The processes where substances change into different substances through the breaking of chemical bonds.
What is the difference between REACTANTS and PRODUCTS in a CHEMICAL REACTION
4 types of evidence a chemical reaction has taken place.
Gas Bubble
Color Change
Precipitation
Energy Released or Used Up
What are the 4 Main Types of Chemical Reactions?
Synthesis
Decomposition
Single Replacement
Double Replacement
What is a Synthesis chemical reaction
Occurs when two elements combine to form a compound.
What is a Decomposition chemical reaction?
A single compound breaks down into two or more elements/compounds.
What is a Combustion chemical reaction?
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. (Think marshmallow burning on a stick.)
What is a Catalyst?
A substance that helps a chemical reaction happen faster. (Think putting gasoline on a fire.)
How does temperature affect the rate of a reaction taking place?
It increases the reaction taking place.
What is Chemical Property?
Original material is transformed into a new material with new properties.
A chemical reaction occurs and new products occur.
Exp: Burning wood, rotting banana, fireworks.
What is Physical Change?
Any change in size, shape or form of matter without changing the identity of substance.
DOES NOT FORM A NEW SUBSTANCE
Exp: Ice cream melting, cutting apple, stretching rubber band.
What is Exothermic?
Energy is released in a reaction and it becomes warmer.
What is Physical Property?
Characteristics that can be OBSERVED through senses, such as color and texture, shape, size, mass. volume, density, odor/smell, texture, etc.
Wax melting is an example of…?
Physical change
Rusting of metal is an example of…?
Chemical change
What is Chemical Change?
One or more substances are changed into new substances that HAVE NEW AND DIFFERENT PROPERTIES.
The change is difficult or impossible to reverse.
Exp: New color appears, bubbles of gas are formed, solid material (precipitates) forms into a liquid.
