Welcome!The Topic For Today Is… SCIENCE SEC 4

Your TopicHistory Electrolytes,

acids, bases Concentration

Atmosphere Rocks Statics

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:• CO

2 has three types of atoms.

• Answer• False. There are three atoms in all but only TWO types: carbon

and oxygen.

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Topic 1: 400• Question:• A boiling point is NOT a characteristic property.

• Answer• False.

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Topic 1: 600• Question:• When chocolate melts it undergoes a physical change.

• Answer• TRUE

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Topic 1: 800• Question:• A characteristic property of oxygen is that it makes limewater

cloudy.

• Answer• False. That’s the characteristic of carbon dioxide.

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Topic 1: 1000• Question:

• Iron, zinc, oxygen, water and brine all have different densities.

Thus, density is a characteristic property

• Answer• TRUE

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Topic 2: 200• Question:• A fish farmer wants to create a 100 000 L pond with a 30 g/L

concentration of salt. How many kg of salt does he have to buy?

• Answer• C=m/V then

• m = CV = 30 g/L(100 000 L) = 3 000 000 g = 3000 kg

Back

Topic 2: 400• Question:• For a different type of fish, he needs a concentration of only 200

ppm of salt. How many kg of salt does he have to buy for this

other 100 000 L pond?

• Answer• C=m/V then

• m = CV = 200 mg/L(100 000 L) = 20 000 000 mg = 20 000 g

=20 kg

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Topic 2: 600• Question:• Describe what happens in a neutralization reaction. How could it

be useful if a lake is so acidic that it

• endangers fish and interferes with the development of their

eggs?

• Answer• Neutralization = acid + base =salt + water. Water is created

form hydroxide(OH-) reacting with H+

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Topic 2: 800• Question:• What name is given to periodic table elements that are semi-

conductors of electricity and which do not react with acid?

• Answer• metalloids

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Topic 2: 1000• Question:• When some charcoal(C) burned, it reacted with 320 grams of

oxygen gas (O2). If 440 g of CO

2 were made, how many grams

• of charcoal reacted?

• Answer• C + O

2 CO

2 x + 320 = 440; x = 120 g

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Topic 3: 200• Question:• From the point of view of their roles in the carbon cycle, what do rainwater and

oceans have in common?

• Answer• Both dissolve carbon dioxide and convert it to carbonic acid.

• H2

O + CO2

H2

CO3

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Topic 3: 400• Question:• What is atmospheric pressure?

• Answer• It is the weight of air acting on a unit area.

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Topic 3: 600• Question:• What role does atmospheric pressure play in allowing us to breathe?

• Answer• When we inhale, the volume of our chest cavity increases, decreasing the

pressure. Then, with

• less hindrance, atmospheric pressure can push the air into our lungs.

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Topic 3: 800

• Question:• Temperature increases with height due to increased absorption

of ultraviolet radiation by the ozone layer, which restricts

turbulence and mixing. While the temperature may be −60 °C

(−76 °F; 210 K) at the tropopause, the top of this layer is much

warmer, and may be near freezing

• Answer• stratosphereBack

Topic 3: 1000• Question:• It begins at the surface and extends to between 9 km (30,000 ft) at the poles and

17 km (56,000 ft) at the equator, with some variation due to weather. It is mostly

heated by transfer of energy from the surface, so on average the lowest part of

this layer is warmest and temperature decreases with altitude

• Answer• troposhere

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Topic 4: 200• Question:• Give an example how sedimentary rock can be turned in to metamorphic rock?

• Answer• Limestone can be converted into marble.

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Topic 4: 400• Question:• Erosion of nitrate-rich rocks introduces nitrates into the soil.

• Are these nitrates absorbed by plants?

• Answer• yes

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Topic 4: 600• Question:• Trace the energy that powers a TV in Quebec to the evaporation of water.

• Answer

• Light and sound come from electricity and digital signals

• The electricity comes from a generator

• The generator obtained its energy from moving turbines

• Flowing water spun the turbines

• Water flowed due to gravity

• The sun’s energy was used to work against gravity as it caused the water to evaporate and fall on

higher ground.Back

Topic 4: 800• Question:• What releases more energy: 3 human beings whose body temperature is at 37.0

oC? Or a single 10 000 kg minke whale whose body temperature is 35.5 oC?

Explain.

• Answer• The whale does. Although it is at a slightly lower temperature, it is much

heavier than the three people, and heat depends on both temperature and

mass.

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Topic 4: 1000• Question:• If a 100 W light bulb releases 4320 kJ in 12 hours, of which 600 kJ is heat, how

efficient is it?

• Answer• % efficiency = (𝒖𝒔𝒆𝒇𝒖𝒍 𝒆𝒏𝒆𝒓𝒈𝒚) ∗ 𝟏𝟎𝟎% = 𝟒𝟑𝟐𝟎−𝟔𝟎𝟎 ∗ 𝟏𝟎𝟎 % = ( (𝒕𝒐𝒕𝒂𝒍 𝒄𝒐𝒏𝒔𝒖𝒎𝒆𝒅) = 86%

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Topic 5: 200• Question:• When an object such as a bed sheet becomes statically charged, what kind of

atomic particles is it either gaining or losing?

• Answer• Electrons. Protons do not move in physical or chemical changes.

Back

Topic 5: 400• Question:• Calculate its power in kW.

• The resistance of a certain battery-powered watch is 100 . It

requires 3V batteries.

• Answer• V = IR

• 3 = I (100)

• I = 0.03A

• P = VI

• = 3(0.03) = 0.09W = 0.00009 kW.

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Topic 5: 600• Question:• Calculate the current drawn by a circuit with an overall

resistance of 50 and a power rating of 0.100kW.

• Answer• P = I

2R

• 100 W = I2 (50) I2 = 2

• I = 2 =1.14 ABack

Topic 5: 800• Question:• If a 240 V, 12 A heater is turned on for 2 minutes, how many joules of energy

does it use up?

• Answer• E=VIt= 240(12)(120)=345600J or 345.6kJ

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Topic 5: 1000• Question:• For each set, choose the one which offers the more resistance

• a wire 40 cm in length and 3 cm wide

• wire 40 cm in length and 8 cm wide

• Answer• a wire 40 cm in length and 3 cm wide___because it’s narrower

and crowds electrons more.

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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!

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!