A pure substance made up of two or more elements that are chemically combined
What is a compound
100
This evidence of chemical change may be seen as bubbles in a liquid
What is gas production
100
The materials at the beginning of a chemical reaction
What are the reactants
100
sour taste, corrosive, wet feeling
What are some characteristics of acids
100
A solution that has a pH between 0 and 6
What is an acid
200
Two or more substances that are in the same place but can be separated
What is a mixture
200
this evidence of chemical change is called a precipitate
What is formation of a solid
200
The NEW material(s) formed at the end of a chemical reaction
What are the products
200
A solution that has a pH of 7 on the pH scale
What is neutral
200
The products of a reaction between and acid and a base
What are water and a salt
300
A well mixed mixture
What is a solution
300
when sugar turns from white to brown when cooked is an example of this type of evidence of chemical change.
What is color change
300
This law states that the total mass of the reactants is equal to the total mass of the products
What is the Law of Conservation of Mass
300
The part of a solution that dissolves the other substance
What is a solvent
300
A solution that has a pH between 8 and 14 on the pH scale
What is a base
400
substance changes form (size, shape, appearance) but does not change into a new substance(s).
What is a physical change
400
This type of evidence of chemical change may include an increase OR a decrease
What is temperature change
400
2CuO + C ⇒ 2Cu + CO2
This is the number of Cu atoms on each side of the equation
What is 2
400
Bitter taste, corrosive, slippery feeling
What are some characteristics of bases
400
A hydrogen atom that lost its electron that is now a positively charged ion
What is a hydrogen ion
500
a change in matter that forms one or more NEW substances. The same elements are present but they are rearranged to into different combinations to form NEW substances.
What is a chemical change
500
This is the KEY characteristic of a chemical reaction
What is the production of NEW substances
500
6CO2 + 6H2O ⇒C6H12O2 + 8O2 + energy
These are the atoms involved in this chemical equation
What are carbon, oxygen, hydrogen
500
The part of a solution that is dissolved
What is the solute
500
A negatively charged ion made of oxygen and hydrogen