Toxins and Conversions Study Guide

Dose causing death of half of the organisms exposed at this level.

• LD₅₀

• LC₅₀

• TC₅₀

• TD₅₀

Indicates how poisonous a substance is to biological organisms

• toxicity

• acute effects

• chronic effects

• bioaccumulation

What is more dangerous LD50 of

• 0.04 ppm

• 1.29 ppm

• 1.04 ppm

• 0.40 ppm

Caffine has an LD50 of 130ppm for mice. Which is the best reason that coffee and caffinated soft drinks are not considered dangerous?

• Caffine is only toxic to mice and not to humans

• You would have to drink an enormous amounts of caffinated drinks to consume a dose that would amount to that concentration

• LD50 is a rating only used for mice.

• Caffine is popular, so a high toxicity is acceptable.

Arrange the following chemicals from most to least toxic: dioxin, nicotine, botulinum toxin A, dieldren.

• Dieldren, dioxin, nicotine, botulinum toxin A

• Dieldren, nicotine, dioxin, botulinum toxin A

• Botulinum toxin A, nicotine, dioxin, dieldren

• Botulinum toxin A, dioxin, nicotine, dieldren

In what units are Lethal Dose50 (LD50) expressed?

• oz/lb

• mg/lb

• oz/kg

• mg/kg

What is Avogadro's number?

• 6.02 x 10²³

• 1 mole

• 600 million

• 6.02

How many moles are in 8.30 X 10²³ molecules of H₂O?

• 1.38 X 10²³ moles H₂O

• 1.38 moles H₂O

• 2 moles H₂O

• 1 mole H₂O

How many molecules are there in 31.8 moles of water?

• 5.28 x 10^-23 molecules

• 1.91 x 10²⁵ molecules

• 5.28x 10^-25 molecules

• 1.91 x 10²³ molecules

A mole is:

• The SI unit for mass

• The SI unit for the amount of a substance

• The SI unit for volume

• The SI unit for area