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43 Cards in this Set

  • Front
  • Back
What is the result when the holes of the burner are completely closed?
The flame turned from blue to yellow.
Describe what happened when an evaporating dish is held in the flame. Suggest a possible explanation.
When burning with a luminous flame (low) it doesnt burn completely and it forms sut.
Where is the hottest portion of a properly adjusted flame located?
At the tip of the inner cone.
What happens when copper wire is held in the hottest part of the flame?
It then begins to catch on fire/ spark.
Why is the nonluminous flame preferred over the yellow luminous flame in the laboratory?
Because it is even hotter.
Describe the scale of your graduated cylinder (that is what is the smallest division and what is the maximum capacity).
The maximum capacity of the graduated cylinder is 100 mL and the smallest is 1mL.
A filter should not be wet with water when the liquid to be filtered does not mix with water. Why?
When you have something that doesnt mix with water for ex. oil it wouldnot go through because water is on the filter paper. So dont put water on the filter paper so it can pass thru.
What property of the sand enables it to be seprarated from the water by filtration?
Because the sand is a solid that doesnt mix with water.
What does the filtrated contains? After the water and salt includiing the sand was poured in...
sodium chloride and water (h20)
What property of the salt prevents it from being separated from the water by filtration?
Because the salt dissolves into the water.
Why should a low flame be used to heat the filtrate if the solid is to be recovered?
So that you dont over heat it that it would splatter or burn the solid so you heat it slowly and evaporate the solvet with out splattering.
As soon as you enter the lab, what safety equipment should you put on immediately?
Apron and googles.
Before doing an experiment, what should you read and discuss with your teacher?
read the safety paragragh and review the safety rules and regulation needed to conduct the experiment safely before you begin.
Before you light the burner, what safety precuations should always be followed?
Should always check to see that long hair and loose clothing have been confined/put away. Also wear safety googles.
What immediate action should you take when the flame of your burner is burning inside the base of the barrel?
You should turn off the gas at the gas valve. Do not touch the barrel for it is extremely hot. Allow barrel to cool down.
When inserting glass tubing, why is it important that you wear safety googles and gloves or cover the tubing and stopper with protective pads and cloth?
Because the glass could brake.
What do you think might be a common cause of fires in lab drawers or locker?
Because if you put hot items in a wooden drawer it would eventually heat up and catch on fire.
Why are broken glassware, chemical, matches, and other laboratory debris never discarded in a waste paper basket?
Because it is a safety precaution against fires and it prevents personal injuries such as hand cuts.
List the safety precautions that should be observed when inserting or removing glass tubing from a rubber stopper?
Never attempt to insert glasstubing that has jagged edge they should b polished b4 being inserted into a rubber stopper. Use water or glycerin as lubricant at the end; next protect hands and fingers by wearing leather gloves. Use a twisting motion and gently push the glasstubing into the stopper then when finished remove the glasstubing to keep it from sticking or freezing to glass.
Why should you never touch chemicals with your hands?
B/c it could pass thru the skin into the blood stream and can cause serious health problems.
What precaution can help prevent chemical contamination in reagent bottles?
Never pour unused chemicals back into their reagent bottles.
Why are chemicals and hot objects never placs directly on a balance pan?
Bc it can permanently damage the surface of the balance pan and affect the accuracy of measurements.
List 3 pieces of equip. used in the lab for measuring small quanities of liquids. What is the correct procedure for filling a buret wit liquid?
Pipet, graduated cylinder, and a buret; Never pour a liquid directly from its reagent bottle into the buret. You should 1st pour the liquid into a small clean and dry beaker that is easy to handle then pour the liquid from the beaker into the buret. (PREVENT SPILLAGE)
How can a liquid be transferred from a beaker to a funnel w/o spattering and w/o runnin dwn the outside wall of the beaker?
By holding a stirring rod at the lip of the beaker. The liquid will run dwn the rod and drop off into te funnel w.o runnin dwn the outside of the beaker.
Describe the conditions of all lab equip. at the end of an experiment. What should be checked before you leave the lab?
equip. should b clean and dry and put away in an orderly fashion for the next lab experimen. Be sure that the valve of the gas jet is shut off. Make sure to wash hands thouroughly w/ soap at the end of each lab period.
What is the correct procedure for removing a solid reagent from its container in preparation for use in an experiment?
By using a spatula.
What is the the correct procedure from removing a liquid reagent from its container in preparation for use in an experiment?
From a beaker hold a stirring rod at the lip and pour slowly so that the water wont spill on the side.
Wht is it important to use a low flame when evaporating water from a recovered filtrate?
Bc a high flame would cause water to over react and splatter to the side w/o evaporating it/burning it
Never work alone in the lab.
true or false
Never lay the stopper of a reagent bottle on the lab table.
true or false
At the end of an experiment in order to save the school'smoney save all excess chemicals and pour them into their stock bottles.
true or false
The quickest and safest way to heat a material in a test tube is by concentrating the flame of the test tube.
true or false
Use care in selecting glassware for high temperature heating. Glassware should by Pyrex or a similar heat treated type.
true or false
A mortar and pestle should be used for grinding only one substance at a time.
true or false
Safety googles protect your eyes from particles and chemical injuries. Ot is completely safe to wear contact lenses under them while performing experiments.
true or false
Never use the watepaper basket for disposal of chemicals.
true or false
First aid kits may be used by anyone to give emergency treatment after an injury accident,
true or false
Eye wash and face wash fountains and safety shower should be checked daily for proper operation.
true or false
blue flame
yellow flame
a dip in water lik a u
process of seperationg liquid
is what goes throught the funnel into the beaker after filtration