Hazardous Materials
Name 5 hazards a chemical can pose.
flammable, toxic, biohazard, radioactive, corrosive
What is the formula for density?
Density = mass/ volume
Name 3 ways to separate a mixture.
Filtration, distillation, magnetism, evaporation, centrifugation
What is the most accurate way to measure a liquid?
a graduated cylinder
Define toxicity.
The kind of harmful effects caused by a substance
You find and test the pH of an unknown chemical. It has a pH of 3. How would you classify this chemical?
Hazardous: Corrosive
How would you calculate the volume of an earring?
Water displacement.
You would like to separate several random pieces of metal. What would be the best way to begin separating them?
With a magnet
Where do you read the liquid level on a graduated cylinder?
the meniscus of the liquid
Define reactive.
Substances capable of causing an explosion or providing heat or oxygen (oxidizers) that might cause a fire, or can emit toxic fumes when mixed with other substances.
You have a substance with a pH of 7. When added into an acid, it produces a gas and smells bad. What can you determine about this chemical?
It reacts with acid.
A graduated cylinder has an initial volume of 25 mL. You drop a rock into the graduated cylinder and now the volume reads 33 mL. What is the volume of the rock?
8 mL
What is an example of a mixture that can be separated using a filter?
sand & water, Coffee grinds & water, any liquid with a solid
How much liquid is in the graduated cylinder?
28
Define risk.
The chance that something unfavorable, such as injury or death, will occur due to a particular action or event.
What does it mean to say a substance is corrosive?
A substance that may dissolve metals, ruin clothing, or burn skin. Strong acids and bases are corrosive.
The mass of an object is 48 g. It's volume is 100 mL. What is its density? (Hint: the FULL answer)
0.48 g/mL
What is the difference between evaporation and distillation?
Using the evaporation technique, you are keeping the solid. Using the distillation technique, you are keeping the liquid vapors.
What is the volume of the gray cylinder?
10 mL
Define miscible.
Two or more substances that can be mixed together in any ratio to form a single phase without separation.
What is the pH of the most corrosive types of substances?
1 & 14
The mass of an object is 448 g. It's volume is 14mL. What is its density? No Calculators. (Hint: the FULL answer)
32 g/mL
You have vinegar, oil, pepper, and oregano in a bottle. List the steps you would take to separate this mixture so that you only have vinegar left.
1. Centrifugation
2. Pipette the less dense layer at the top (oil)
3. filter out the solids.
4. Left with the vinegar.
What is the volume of the ring?
4 mL
Define Trade-off.
An exchange of one thing in return for another. Giving up something that is a benefit or an advantage, in exchange for something that may be more desirable. Trade-offs always involve balancing benefits against risks.