Vocabulary and Definitions
A homogeneous mixture formed when a solute dissolves into a solvent.
What is a solution?
The term that describes the speed at which a solute dissolves in a solvent.
What is the rate of dissolution?
Tearing, folding, or crumpling a piece of paper changes its appearance but is this type of change.
What is a physical change?
Alka-Seltzer dropped into water or baking soda mixed with vinegar shows this indicator of a chemical reaction.
What is the production of gas (or bubbling/fizzing/foaming)?
Writing on paper is an example of this kind of change.
Physical change
A substance that dissolves in another substance (solvent) to form a mixture.
What is a solute?
Increasing this factor gives particles more kinetic energy, causing them to move faster and hit the solute more energetically.
What is temperature?
Sharpening a pencil is a __________ change.
What is a physical change?
Leaves changing color during autumn or silver tarnishing are examples of this chemical change evidence.
What is a color change?
When two or more liquids combine it is called a _______.
what is a solution?
The substance in which a solute is dissolved (for example, water in sweet tea).
What is a solvent?
Crushing or breaking a solute into smaller pieces increases this, allowing solvent particles to attack it from multiple directions.
What is surface area?
Type of change that results in a temporary alter in look/phase and can typically be reversed, versus a change that forms permanent new substances.
What is a physical change (versus a chemical change)?
A solid substance that forms and settles out when two liquid solutions are mixed together.
What is a precipitate?
A solution where the solvent is water.
What is an aqueous solution?
The measure of the average kinetic energy of all the particles in a material.
What is temperature?
This action (stirring or mixing) increases particle collisions and distributes solute particles evenly throughout the solvent.
What is agitation?
Combustion, such as burning wood or setting off fireworks, creates new products and is categorized as this type of change.
What is a chemical change?
Burning wood producing heat, fireworks giving off light, or explosions making sound are all evidence of this.
What is the release of energy?
In a solution of water and sugar water is the _______ and sugar is the __________.
What is solvent and solute?
A thin layer of corrosion that forms on metals, making them look dull or discolored.
What is tarnish?
The three ideal conditions to dissolve sugar as quickly as possible when making sweet tea.
What are high temperature (warm water), smaller/granulated sugar pieces (high surface area), and stirring (agitation)?
When a sliced apple turns brown after exposure to air, it undergoes this chemical reaction process.
What is oxidation?
An example of a color change occurring that is NOT a chemical change.
What is adding food coloring to water?
Name the 4 main pieces of evidence that indicate a chemical change has taken place.
What are: 1) Production of gas, 2) Color change, 3) Formation of a precipitate, and 4) Release of energy (light, heat, sound)?