Chemical or Physical
Two liquids are mixed and a solid white gunk is formed.
Chemical or physical.
Chemical: a precipitate was made.
What is the formula for Density?
D = M/V
What is the chemical property called that determines whether or not a chemical will bubble and fizz when it dissolves something else?
Acidity (acid or base)
Define Texture
How something feels
What is Mr. McNeil's favorite color?
Black and red.
two solids are mixed together and you see heat and smoke rising. `
Physical or chemical?
Chemical. Something new was produced.
If a sample has a mass of 4g and a volume of 2 ml, what is it's density?
4/2 = 2 g/ml
What is the chemical property that determines whether or not a chemical is capable of burning?
Flammability
define malleability
Whether something has the ability to be pounded into sheets without breaking.
What is Mr. McNeil's favorite game franchise?
Final Fantasy
Water is boiling. Physical or chemical change?
Physical. Water is still water.
A mostly Iron rock has a mass of 20g. If Iron has a density of 8 g/ml, how much space (volume) should it take up?
20/8 = 2.5 ml
What is the chemical property that determines whether or not something can react with oxygen?
Rust (oxidization)
Define ductility
whether something has the ability to be pulled into wires.
What is Mr. McNeil's little dog named?
Kira
A blue solid and a clear liquid are mixed. The solid dissolves and turns the liquid blue.
Physical or chemical change?
Physical. The blue stuff dissolved.
How can we measure the volume of an oddly shaped rock or solid?
Put it in a glass that has measurements on it and that is filled with water.
Whether something is capable of decomposing and releasing radiation.
What are three physical properties that you can verify with your senses?
Taste, texture, color, odor, etc.
if you had two unknown substances, how could you know if they are identical?
if they have the same melting and boiling points, the same reactivity, etc.
If you have two unknown substances, which type of property would be best to use to identify each substance and why?
You should use Chemical Properties! We can identify chemicals based on their chemical properties and how they react with other sustances.
Physical properties are useful if there are big differences between the two. But if they are close to the same (flour vs baking soda), we have to look at chemical properties.
Lead has a density of 11.4 g/ml
Iron has a density of 7.84 g/ml
Mercury has a density of 13.5 g/ml
Copper has a density of 8.96 g/ml
If each of these were melted and mixed together, which would end up separating into which layers?
Top to bottom: Iron, Copper, Lead, Mercury
What word describes how dangerous or reactive something is?
Volatile
Why is dissolving salt in water a physical change?
The salt is still in the water. It is still made of sodium and chlorine and will still taste salty.
How is a mixture and a pure substance different?
A mixture is made of more than one type of chemical.
A pure substance is made up of only one chemical.