Lesson 1
what are mixtures
A mixture is two or more substances physically combined.
WHat is physical change
A physical change is a change that alters the form or appearance of a substance without changing it into a different substance .
What is this the definition of : where matter can enter or escape
An open system
How do you identify a pure substance?
Chemical and physical properties.
describe Heterogeneous mixture
a combination of two or more substances where the individual components remain physically separate and distinguishable.
Liquid or solid reactants produce what in a chemical reaction?
What is the law of conservation of mass?
When during a chemical reaction matter is neither created nor destroyed.
What is an example of a polymer?
Wool, silk, rubber, and cellulose.
explain what solutions are
A solution is a homogenous mixture of a solvent and one or more solutes.
Explain the building and breakings chemical bonds.
Chemical changes occur when existing bonds break and new bonds for. As a result, new substances are made.
To synthesize means to ...
Put things together
What are synthetic materials?
Chemicals and resources made by humans.
types of solubility
saturated, unsaturated, supersaturated or physical states solid-in-liquid, gas-in-liquid, liquid-in-liquid.
Compare and contrast chemical change and physical change.
A physical change, changes the appearance of a substance without changing it into a different substance. A chemical change, changes the substance.
What three things do chemical equations convey?
1. the identities of the molecules involved in the reaction
2. the elements that make up these molecule
3. weather the molecules are products or reactants.
Synthetic fibers are cheaper to produce, they last longer, dry quicker, and they clean easier than natural fibers.