What are the signs that a chemical reaction has taken place?

Atomic Structure

U-236

• Number of protons• Number of electrons• Number of neutrons• Ion, element or isotope?

Define the following and give an example

Substance

Heterogenous

Compound

Homogeneous

Mixture

Differentiate between independent and dependent variables

Percent Composition

C6H12O6

Empirical and molecular formulas

38.67% C 16.22% H 45.11% N

Molar mass = 124 g/mol

Calculate the quantity of energy needed to heat 8.0 g of water

from 42.0 degrees Celsius to 45.0 degrees Celsius.

Chemical formulas

Calcium chloride

Sodium acetate

Copper (II) sulfate

Magnesium phosphate

Balance the following and tell me what type of reaction it is

Copper + sulfur produces copper (I) sulfide

Silver nitrate + aluminum chloride produces silver chloride

+ aluminum nitrate

Chromium (III) carbonate breaks down into chromium (III) oxide +

carbon dioxide