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☆☆☆☆☆adding acid to the water
between the secon and third finger
a crucible with the lid slightly ajar
maintain a consistent temperature thoughout
2,700
Level with the bottom of the fluid's meniscus
No. Chemicals should be disposed of in a safe manner. Usually directions for disposal can be found on the box/tube/packet that the chemical came in. If none can be found, ask a professional (teacher, lab assistant, poison control expert) what is the proper disposal for a certain chemical. Excess materials poured down the drain may be poisonous to the environment or people, and can leak from the sewage system to our ground water and eventually to our food.
Consistent temperature can be achieved by heating a test tube while moving the test tube all around the flame. Do not let only one part of the test tube rest on a flame but instead, keep moving the test tube slowly.
16 protons and 18 electrons
40.78
The atomic number for the Element Lead is 82.
50.4 has three significant digits.
The atomic number for the Element Lead is 82.
Mass number refers to a particular isotope of 82Pb.
