LBC Chapter 14 Quiz

Reorder the following substances from least to MOST toxic.

• table salt

  (LD₅₀ = 3000 mg/kg)

• paraquat

  (LD₅₀ = 100 mg/kg)

• nicotine

  (LD₅₀ = 9 mg/kg)

• cola (LD₅₀ = 140 mg/kg)

Answer explanation

If you did not answer this question correctly, please review Lesson 74 Lethal Doses

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Lesson 74

How many milligrams of paraquat (LD₅₀ = 100 mg/kg) would be lethal to a 220-pound man? (2.2 lb = 1kg).

Give you answer rounded to the nearest tenth.

Make sure to show your work for full credit!

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NGSS.HS-PS1-2

NGSS.HS-PS1-5

How many atoms are there in 1 mole of H₂SO₄?

• 6.02 x 10²³

• 1.806 x 10²⁴

• 3.612 x 10²⁴

• 4.214 x 10²⁴

Reorder the following substances from highest to lowest number of oxygen atoms:

• I mol H₂O₂

• 2 moles H₃PO₄

• 1 mole H₂O

• 1 mol H₂O₂

• 3 mol O₂

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Lesson 79

Calculate the molar mass of hydroxylamine, NH₂OH. Round your answer to the nearest hundredth. Make sure to show your work for full credit!

Calculate the molar mass of phosphorus trichloride, PCl₃ . Round your answer to the nearest hundredth. Make sure to show your work for full credit!

How many moles of calcium, Ca, are in 100 grams of CaCl₂?

• 0.90 mol Ca

• 1.11 mole Ca

• 40.070 mol Ca

• 11098 mol Ca

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NGSS.HS-PS1-7

The LD₅₀ for caffeine is 140 mg/kg. Would you consider caffeine to be more

or less toxic than arsenic (LD₅₀ = 15 mg/kg)? Explain.

You can type your answer or write on paper and upload.

Which element has a molar mass of 183.84 g/mol?

• tungsten

• antimony

• platinum

• lithium

How many grams of hydrogen, H, are in 2 moles of water, H₂O? Round your answer to the nearest hundredth.

Show all work in order to get full credit!