Separating Mixtures
Using color to observe a substance is an example of what property?
physical property
Fe
Chemical symbol for iron
chemical reaction
the ability to float when submerged in a liquid
Buoyancy
What physical property was used to observe iron fillings?
Magnetism
Identify the key term that explains how salt was separated from the water.
Evaporation
NaCl
Chemical compound for salt.
Why is rusting an example of a chemical change?
Oxidation occurred. Iron, oxygen, and water combines leading to corrosion.
The formula for calculating the density of an object is
d= m/v
In a mixture, substances can be separated by __________ means
physical
How can you separate a mixture of iron fillings from a mixture of sand?
Use a magnet to remove the iron fillings.
Element, compound, or mixture? N2
Element- made up of only Nitrogen atoms
Freezing water is a type of:
physical reaction
Temperature is held constant. As volume of a container filled with gas decreases, pressure ______
increases
Cannot be chemically broken down into a simpler substance
element
Why was it important to use filter paper to separate sand from water?
The filter paper caught the sand and allowed water to pass through.
SiO2 is the chemical formula
sand
A precipitate occurs when two substances mix and form a solid. What must happen to multiple substances in order for this took take place?
A chemical reaction.
transition from solid directly to the gas phase.
Sublimation
Water is made up of what elements and how many of each?
Identify the key term that best describes how sand was separated from water.
Filtration
Compound
A chemical combination of two or more substances
Compound
It remains constant before each phase change.
Milk and fog are examples of:
Colloids