Tutor profile: Emily W.
Subject: Environmental Science
Regarding toxicology and the potential for humans to interact with harmful chemicals, what are the four main ways in which absorption can occur?
The main ways a toxin can be absorbed are inhalation (through the lung), ingestion (through the GI tract), skin contact, or direct injection into the bloodstream.
Subject: Basic Chemistry
For the element carbon, figure out how many valence electrons there are in each shell.
Answer: First Level = 2, Second Level = 4. Explanation: Carbon has the atomic number of 6. This means that it has 6 electrons. Valence electrons are organized by shells or levels. Each level has a specific number of electrons that it can hold. The first level can only hold 2 electrons. Since carbon has more than 2 electrons, carbon must have more than one level in its' electron cloud. The second level can hold 8 electrons. Since 2 electrons went into the first level of the cloud, the remaining 4 will go into the second level of the cloud. Note: the outermost level of the electron cloud does not need to be full.
What is the absolute value of -12?
The absolute value of -12 would be 12. The absolute value of a number simply means the number's distance from 0. For example, the number 12 would also have an absolute value of 12.
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