welcome! the topic for today is…ste sec 4

Welcome!The Topic For Today Is…STE Sec 4

Your TopicToxicology Charges Stoicheometry Q=mcT Physics

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Bonus Question: 5000 pts

Topic 1: 200• Question:• What is the difference between a toxic and a lethal dose?

• What year did the Great Depression begin• Answer• A toxic dose is the amount in mg of substance per kg of weight

that causes illness. A lethal dose is the concentration that kills.

Back

Topic 1: 400• Question:• Calculate the LD

50 in each of the following cases. Express in

mg/kg.

• A dose of 1500 mg of salt killed 50% of 5000 g rabbits.

• Answer• 1500 mg/5 kg = 300 mg/kg

Back

Topic 1: 600• Question:• A 75 kg man was killed because in drinking 1000g of booze, he

experienced a LD50

for alcohol. The booze was 53% alcohol.

• Answer• 0.53*1000 000 mg/75kg

• = 7066 mg/kg

Back

Topic 1: 800• Question:• How many 500 mg vitamin tablets would a 100 kg patient have

to swallow in order to experience a lethal dose if the LD50

is

11.9 g/kg?

• Answer• 11.9 g/kg * 100 kg = 1190 g 1190g/ 0.5 g/tablet = 2380 tablets

Back

Topic 1: 1000• Question:• A certain type of green algae have a cadmium concentration of

0.10 parts per million. But an analysis of the algae reveals that the concentration of cadmium contaminant in the water is 0.01 ppm. Calculate the BCF factor.

• Answer• 0.10/0.01 = 10

Back

Topic 2: 200• Question:• What ion formed from an element of the fourth shell (4th period)

is found in seashells?

• Answer• Ca+2

Back

Topic 2: 400• Question:• Describe an experiment that you could do to help you

prove that a hydrogen ion does not have the same chemical properties as a neutral hydrogen molecule

• Answer• Add blue litmus to acid(has hydrogen ion). The

litmus will turn red.• Place blue litmus in hydrogen gas. Nothing will

occur.Back

Topic 2: 600• Question:• Explain why +1 is the common ion for alkali metals.

• Answer• They all have 1 loose valence electron.

Back

Topic 2: 800• Question:• I am an element that likes to form the -1 ion, and I have the

smallest nucleus among the members of my family. What am I?

• Answer• Fluoride

Back

Topic 2: 1000• Question:• Explain why fluorine forms diatomic molecules.

• Answer• By having 9 protons but only two shells, each F nucleus has

enough force to pull in an electron from the other. The result is that the shared electrons act as a bond.

Back

Topic 3: 200• Question:• Convert the following:

• 300 g of Mg = __________moles

• Answer• 300 g (mole/24 g) = 12.5 moles

Back

Topic 3: 400• Question:• Convert the following

• 6 moles of O2

= ________molecules

• Answer• 6 moles (6.02 X 1023 molecules/mole) =

• 3.6 X 1024 molecules

Back

Topic 3: 600• Question:• Monty Mole found a mole of gold. If gold sells for $28 US per

gram in Dec 2008, what is the value of Monty’s mole of gold?

• Answer• 1 mole Au = 197 g

• 197 g($28/g) = $

• 5516 US

Back

Topic 3: 800• Question:• How many moles of water will be produced if 5 moles of

ammonia, NH3(g),

react

• Answer• 5 moles NH

3 (6 H

2O/ 4 NH

3(g)) ) =7.5 molesH

2O

Back

Topic 3: 1000• Question:• How many grams of oxygen react with every 1.0 gram of

NH3(g)?

• Answer• 0.074 moles O

2 (32 g/mole) = 2.35 g O

Back

Topic 4: 200• Question:• An average sized banana (118 g) yields 454.300 kJ of heat when burnt to a crisp.

• If you managed to transfer all of the heat to a cup of water ( 250 g) at 20 oC, how warm would the

water get?

• Answer• Specific heat of water = 4190 J (kg C) or 4.19 J (g C)

• Q = mcT

• 454 300 J = 250 g(4.19 J/(g oC)(x – 20)

• x = 454 oC

• (That temperature will never be obtained for water---it’ll boil off first, which means that a cup of

water is too small to absorb all the heat.)

Back

Topic 4: 400• Question:• You want to cool 1000 kg of water at 40o C to a comfortable 32o C with only 258 L of water.

How cold should that 258 L be, assuming that no heat is lost to the surroundings ?

• Answer• Density of water: 1.0 kg/L

• -Qhot = Qcold

• -1 000 000(4.19)(32-40) = 258 000(4.19)(32-x)

• -1000(-8) = 258(32 - x)

• 8000/258 = 32 – x

• x = 32 -8000/258 x= 1

oC

Back

Topic 4: 600• Question:• How much energy in joules is used by the heating element of the

coffee maker during this period?

• Answer• E = VIt

• V=IR, so I =V/R=120/20

• = 120 J/C(120/20)C/s(15*60 s)

• = 648 000 JBack

Topic 4: 800• Question:• A series circuit with three light bulbs has voltage drops of 1.2 V,

1.4 V and 1.4 V. The ammeter measures 0.50 A.

• What is the wattage of the bulb that consumes the least energy?

• Answer• P = VI = 1.2J/C(0.50 C/s) = 0.6 J/s = 0. 6 W.

Back

Topic 4: 1000• Question:• A series circuit with three light bulbs has voltage drops of 1.2 V,

1.4 V and 1.4 V. The ammeter measures 0.50 A.

• How much energy is used by all three bulbs every hour they’re turned on?

• Answer• V

t = 1.2+1.4+1.4= 4.0 V

• E = VIt=4(0.5)(3600 s) = 7200 J

Back

Topic 5: 200• Question:• The effective force is in the direction of the acceleration. If the

35 N force is applied at angle of 27o, calculate the effective force.

• Answer• F

effective/35 = cos 27

• Feffective

= 35 cos 27 = 31.2 N

Back



• What is the vertical component of the 35 N force?

• Answer• F

effective/35 = sin 27

• Feffective

= 35 sin 27 = 15.9 NBack



• Find the combined weight of the girl and the sled if the combined mass is 30 kg.

• Answer• Weight =F

g= mg

• =(30 kg)(9.8m/s2)= 294 NBack



• Why doesn’t the sled lift up?

• Answer• 294 N > 15.9 N(the vertical component)

Back

Topic 5: 1000• Question:• Calculate the skier’s effective force

• as he is pulled downhill.

• Answer

• sin Feffective/Fg 2

• sin 12 = Feffective

/(75 kg*9.8m/s ) Feffective

=75

kg*9.8m/s2)sin12

• =152.8 N

Back

Daily Double

The Winner Of The Last RoundWrite Down How Much Money

You Are Willing To RiskIf You get the Question write you win that money

If you get it wrong you Loss the money!

welcome! the topic for today is…ste sec 4

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