Safety Rules and Lab Procedures
What is the volume of the water in the plastic cup?
(see cylinder)
What type of hazard is a substance if can catch fire spontaneously?
flammable
If a liquid separates when it is mixed with water, is it considered to be miscible or not miscible in water?
not miscible
What is the formula to determine density?
Density = mass / volume
What is a substance that is harmful to human health or the environment if not handled with caution known as?
hazardous materials
What safety rules should you follow while doing a science laboratory? A. Wear safety goggles at all times. B. Securely replace tops on all chemicals at all times. C. Immediately tell your teacher if a spill occurs. D. All of the above.
D
What type of hazard would you find this image on?
toxic
How would you separate a mixture of sand and water?
A filter
If vegetable oil is less dense than water, and Mercury, a liquid metal, is more dense than water, which liquid would sink to the bottom if all three liquids were mixed together?
Mercury
Which type of property (chemical or physical) is the ability to conduct an electric current an example of?
physical property
What two pieces of laboratory equipment would you use to measure the mass and volume of a wooden block?
a balance and metric ruler or a balance and a graduated cylinder
How should you dispose of old batteries? Why?
bring them to a facility that collects/recycles them because they contain heavy metals that can contaminate ground water if they end up in the landfill.
How would you separate a mixture of salt and iron shavings?
a magnet
What is the density of a rock that has a mass of 60 g and a volume of 5 mL?
12 g/mL
What is the difference between a homogeneous mixture and a heterogeneous mixture?
A homogeneous mixture has the same uniform appearance and composition throughout. A heterogeneous mixture consists of visibly different substances.
If you were working with the product with the pictured label, what safety precautions would you take?
Wear safety goggles and wash hands when done. Keep away from an open flame.
According to the chemical data card, what type of hazard(s) would you classify Hydrochloric Acid as?
toxic and corrosive
If you determined an unknown metal to have the volume of 2 mL and a mass of 8.6 grams, according to the Table of Known Densities, what type of metal is your sample? How do you know?
Titanium - because my sample has a density of 4.3 g/mL, which is closest to the density of Titanium (4.5 g/mL)
If the wooden cube pictured has a mass of 21 grams, will it sink or float in water? How do you know?
It will float because its density is 7/9 g/cm^3, which is less than 1 g/c^3 (the density of water)
What two properties can you determine if you place a solid in water?
density and volume
Write a procedure to separate the contents of a can containing olive oil, water, small pebbles, and fine pieces of metal (iron). Be sure to include safety precautions!
Sample answer. 1. Put on goggles. 2. Use a dropper to remove the top layer of olive oil. 3. Pour the mixture through a filter to filter out the solid. 4. Use a magnet to remove the iron shavings. 5. Use forceps to remove the small pebbles. 6. Wash hands when done.
If the label on a drain cleaner says that it is harmful or fatal if swallowed, and it causes severe irritation to eyes and skin, then what type of hazard is it?
toxic
Compare the information in your data table to the Table of Known Liquids and determine what liquid A is. How do you know?
Lauric Acid - not miscible in water, but is miscible in ethanol
If you have a wooden block with the density of 1.4 g/mL and you cut it in half, will it sink or float in water? Explain.
It will sink in water because its density will remain 1.4 g/mL, which is greater than 1.0 g/mL (the density of water). Even though you cut the wooden block in half, its density does not change.
From our various lab activities, identify an example of a chemical property of matter.
flammability or reactivity with Copper Chloride