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How can a pants pocket be empty and still have something in it?
A hole.

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The poor have it. The rich want it. If you eat it you die.
Nothing.

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I have a foot but no legs...what am I?
A snail.

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a = 13km
b = 2.4 km
c = 31.2 km

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I ski a distance of 13km between 2 ski resorts. During this time I drop 2400 m. Work out the distance of the ski slope in metres!

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Change in Velocity: 100km/h
Time taken: 2.46s
100/2.46 = 40.65 km/h/s

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The Bugatti Veyron can travel from 0 – 100km/h in how many seconds?​ 2.46 seconds! Calculate its acceleration in km/h/s to 2 decimal places?​

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42 x 1000 = 42000m
3600 second in an hour.
3600 + 3600 + 60 + 60 + 57 =  7377 seconds
D/T = S
42000/7377 = 5.69 m/s

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My name is Dennis Kimetto. I hold the world record for the marathon. I ran 42 km in 2hours 02mins and 57s. Calculate my average speed in metres per second.

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107 seconds
2.82 x 1000 = 2820 m
D/T = S
2820/107 = 26.36 m/s

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My lap time for the ‘Top Gear’ lap  challenge is 1m47s. The track is 2.82 km. Calculate my average speed!

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D/S = T
(30/140) x 60 = 13 minutes

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1062/60 = 17.7
17.7/60 = 0.295
Mach 1 in km/s: 0.295
0.295 x 24.1 = 7.11 km/s

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The shuttle was travelling at Mach 24.1 at the time of re-entry. Calculate its speed in km/s correct to 2 decimal places at the time of the disintegration.​
Hint: Mach 1 = 1062 km/h

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It’s 2 pm. I need to collect a ‘shipment’ arriving at the Dublin docks today before 2:15 pm cus Fran tells me the guards are on de way. The docks are 30 km away. If I drive the car at an average of 140 km/h all the way will I beat the cops?

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Ilan Ramon was the first Israeli astronaut on the Space Shuttle Columbia that was launched on January 16, 2003. His son, Assaf Ramon, also died was also killed on an aircraft. Ilan's youngest son wanted to be an astronaut too, but Ilan's wife could not stand risking the life of another loved one.

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The Columbia was a NASA space shuttle which was used for space missions. It launched for the last time on January 16th 2003. On February 1st 2003 the Columbia disintegrated on re-entry to earths atmosphere… Killing all seven astronauts aboard.

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NASA Gives Graphic Details of Columbia Deaths

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RARE! Space shuttle Columbia Explosion footage

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On February 1st, 2003, the space shuttle Columbia disintegrated during its re-entry into the atmosphere. The seven astronauts were killed. 82 seconds after the launch of shuttle (STS-107), a sizable piece of foam struck the leading edge of Columbia's left wing, at a speed between 650 and 950 km/h, making a hole in the protective tiles made of reinforced carbon-carbon (RCC), close to the landing gear area.

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Part 1
In space there is zero gravity. The ink doesn't flow onto the ball in enough quantity for the pen to work.
Part 2
Use a fisher space pen.

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Part 1
I am trying to communicate by writing notes on paper with a black marker and then going outside in my spacesuit and holding it up to a camera outside that is linked to Earth. I have to write the notes inside. Why?
Part 2
Can you think of a simple solution to enable me to be able to write outside in Mars’ atmosphere?

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To keep the doctor away.

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Doctor Smith and a bus driver Jones are both in love with the same woman named Emma. The bus driver needs to go for a long trip of 10 days. Before he left he gave Emma 10 apples. Why?

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An echo.

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Many have heard it but nobody has ever seen it, and it will not speak back until spoken to. What is it?

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Fill the 3 litre jug and empty it into the 8 litre jug.
Fill the 3 litre jug again and empty it into the 8 litre jug.
Fill the 3 litre jug once again and fill the remaining portion of the 8 litre jug.
The 8 litre jug would be full with one litre of liquid in the 3 litre jug.
Empty the contents of the 8 litre jug into the sink
and pour the content of the 3 litre jug into the 8 litre jug.
Fill the 3 litre jug once again and pour it into the 8 litre jug.
The 8 litre jug would contain 1 + 3 = 4 litres.

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You have only an 8-litre jug and a 3-litre jug. Both containers are unmarked (ungraduated). You need exactly 4 litres of water. How can you get it, using a nearby tap?

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When you heat an atom, some of its electrons are "excited* to higher energy levels.

When an electron drops from one level to a lower energy level, it emitsenergy.

The wavelength (colour) of the light depends on the difference in the two energy levels.

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Salt​ | Characteristic Colour​
Strontium Chloride​ | Red​
Lithium Chloride​ | Crimson​
Sodium Chloride​ | Yellow/Orange​
Potassium Chloride​ | Lilac/Violet​
Barium Chloride​ | Pale Green​
Copper Chloride​ | Blue/Green​

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1. Fill water basin with water.​

2. Place 6 wooden splints into the water. (Submerge them to make sure they are soaked)​

3. Light the bunsen burner and set it to the blue flame.

4. Using one of the soaked wooden splints insert one end of the splint into the Lithium Chloride. (Some of the Lithium Chloride will stick to the soaked wooden splint).​

5. Enter and hold the Lithium Chloride in the blue flame.

6. Note the colour that the burning salt gives off.

7. Repeat this procedure for the 5 remaining salts and ensure to use a fresh wooden splint each time.​

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Lithium Chloride​

Sodium Chloride​

Potassium Chloride​

Barium Chloride​

Copper Chloride​

Strontium Chloride​

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Water basin​

Wooden Splints

Bunsen Burner​

Safety Goggles

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FeCl₃ + 3NaOH  ->  Fe(OH)₃ + 3NaCl​

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FeCl₃ + 3NaOH  ->  Fe(OH)₃ + 3NaCl​

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AgNO₃ + HCl  ->  AgCl + HNO₃

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AgNO₃ + HCl  ->  AgCl + HNO3​

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C₈H₁₈ + 25O₂  ->  16CO₂ + 18H₂O

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C₈H₁₈ + O₂  ->  CO₂ + H₂O

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2HNO₃ + Ca(OH)₂  ->  Ca(NO₃)₂ + 2H₂O

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HNO₃ + Ca(OH)₂  ->  Ca(NO₃)₂ + H₂O

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4P + 5O₂  -> 2P₂O₅

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P + O₂  ->  P₂O₅

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3Fe + 2O₂  ->  Fe₃O₄

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Fe + O₂  ->  Fe₃O₄

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FeCl₃ + 3NaOH  ->  Fe(OH)₃ + 3NaCl​

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FeCl₃ + 3NaOH  ->  Fe(OH)₃ + 3NaCl​

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BaCl₂ + Na₂SO₄  -> 2NaCl + BaSO₄

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BaCl₂ + Na₂SO₄  ->  NaCl + BaSO4​

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Mg(OH)₂ + 2HCl  ->  MgCl2  + 2H₂O

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Mg(OH)₂ + HCl  ->  MgCl2  + H₂O

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3Fe + 2O₂  ->  Fe₃O₄

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Fe + O₂  ->  Fe₃O₄

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AsCl₃ + 3H₂O  ->  H₃AsO₃ + 3HCl

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AsCl₃ + 3H₂O  ->  H₃AsO₃ + HCl

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2Al + 3Cl₂  ->  2AlCl₃

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Al + Cl₂  ->  AlCl₃

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2HCl + CaCO₃  ->  CaCl₂ + H₂O +CO ₂​

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HCl + CaCO₃  ->  CaCl₂ + H₂O + ________?​

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2HCl + Na₂CO₃  ->  2NaCl + H₂O + CO ₂

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HCl + Na₂CO₃  ->  NaCl + H₂O + ________?​

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Time (s)​ | 0​ | 30​ | 60​ | 90​ | 120​ | 150​ | 180​ | 210​ | 240​
Reading on Graduated Cylinder​ | 250​ | ​275 | ​295 | 310​ | ​325 | 335​ | ​345 | ​355 | ​365
Volume Oxygen Gas (cm3) ​ | ​0 | 15​ | ​35 | 50​ | 65​ | 75​ | 85​ | 95​ | ​105

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The chemical formula for hydrogen peroxide is H₂O₂.  It looks pretty similar to the chemical formula for water, which is H₂0, except that hydrogen peroxide has an extra "O", an extra oxygen.  Hydrogen peroxide is not a very stable compound, so, it is always decomposing to water and oxygen, but under normal conditions, the decomposition goes very slowly.

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1. Set up apparatus as shown.​

2. Note the reading on the inverted graduated cylinder.​

3. Add MnO2 to the H2O2 and start the stopclock.​

4. Note and record the reading on the inverted graduated cylinder every minute.​

5. Plot results on graph with time in minutes on the x axis and volume in cm3 on the Y axis.

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Buchner Flask​

Spatula

Rubber tubing​

Rubber stopper​

Water Basin​

Retort Stand​

Beehive shelf

Graduated Cylinder 250 ml​

Graduated Cylinder (Either 100 ml or 25 ml)​

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To measure the rate of oxygen gas production​

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To measure the rate of oxygen gas production​

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Hydrogen Peroxide naturally breaks down to produce Oxygen and Water.​

Manganese dioxide acts as a catalyst for this reaction to speed up the breakdown of the Hydrogen Peroxide

Reaction: 2H2O22H2O + O2

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Preparation Of Oxygen Using Hydrogen Peroxide

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During May, June, and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun. The same is true of the southern hemisphere in November, December, and January. It is the tilt of the Earth that causes the Sun to be higher in the sky during the summer months. However, due to seasonal lag, June, July, and August are the hottest months in the northern hemisphere and December, January, and February are the hottest months in the southern hemisphere.

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This happens because of the sun's rays being stronger on different parts of the world depending on what time of the year it is.

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Chile is in the southern hemisphere, so their winters happen when our summers do and vice versa.

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3 to 4 days.
If they drink each other's urine, they might last around a week before the urine does not contain any water.

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With oxygen and c02 ruled out, water and food are the only other ways they could die faster. A human can only survive 3 to 4 days without water, so this would be the result of their deaths.

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Human breathes out only 2.3 pounds of c02 a day. This is only 0.012547 cubic metres per month with all three combined. C02 would not kill them quickly either.

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1.83180375 x 10^27 molecules of oxygen in the room
Only 13866552 molecules of oxygen taken in every minute by all 3
Oxygen would last them at least a year

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34.89 m cubed of c02 kills him

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10% co2 kills human

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16 breaths per minute

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Table: 0.8  m cubed
Human: 0.285 m cubed
room : 350 m cubed
348.915 m cubed

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Today I am going to show you how to make rainbow colored flames out of household materials. Whats your favorite color??? Lithium from batteries burns red, Calcium chloride in Damp-Rid burns orange, Sodium in table salt burns yellow, boron in roach killer burns green, methanol burns blue all by itself, and potassium in No-salt burns purple.