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A sunscreen product acts like a very thin bulletproof vest, stopping the UV photons before they can reach the skin and inflict damage. It contains organic sunscreen molecules that absorb UV and inorganic pigments that absorb, scatter and reflect UV. To deliver a high level of protection, a sunscreen product must have sufficient quantities of these protective agents

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Fireworks are amazingly fun to watch. We see them every year at all different occasions but have you ever thought what is actually happening?

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A catalyst is a substance that will change the rate of a reaction. A catalyst is often used to make a reaction go faster.  The catalyst does not take part in the reaction as a reactant. It is not changed by the reaction or used up during the reaction.  A catalyst works by providing a convenient surface that enables a different route for a chemical reaction to occur.
The reacting particles on the catalyst surface collide more
frequently with each other and more of the collisions
result in a chemical reaction because the different route
provided by the catalyst has a lower activation energy.

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An acid is neutralised when it reacts with
an alkali, a base, a carbonate or a metal.
When neutralisation is complete there is no more acid left, the pH is 7 and the solution will contain a neutral salt.

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Preparation Of Oxygen Using Hydrogen Peroxide

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Shooting stars look like stars that quickly shoot across the sky, but they are not stars. A shooting star is really a small piece of rock or dust that hits Earth's atmosphere from space. It moves so fast that it heats up and glows as it moves through the atmosphere. Shooting stars are actually what astronomers call meteors. Most meteors burn up in the atmosphere before they reach the ground. However, once in a while a meteor is large enough than some of it survives and reaches Earth's surface. Then it is called a meteorite.

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Night Sky & Shooting Stars, Fairbanks Alaska

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While waiting for an aurora display that never showed, I captured a few shooting stars. Nikon D800 & Tokina 16-28 2.8, f/2.8, 15 sec exposure, ISO 1600, 2 sec delay.

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Acid–base titrations | Chemical reactions | AP Chemistry | Khan Academy

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Acceleration is the name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both.

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Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration until the reaction reaches neutralization, which is often indicated by a color change. The solution called the titrant must satisfy the necessary requirements to be a primary or secondary standard. In a broad sense, titration is a technique to determine the concentration of an unknown solution

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Lightning is an electric current. To make this electric current, first you need a cloud.
When the ground is hot, it heats the air above it. This warm air rises. As the air rises, water vapour cools and forms a cloud. When air continues to rise, the cloud gets bigger and bigger. In the tops of the clouds, temperature is below freezing and the water vapour turns into ice.
Now, the cloud becomes a thundercloud. Lots of small bits of ice bump into each other as they move around. All these collisions cause a build up of electrical charge.
Eventually, the whole cloud fills up with electrical charges. Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud.
When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud. This is like a static electricity sparks you see, but much bigger.

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Why does lightning zig zag instead of traveling in a straight line? Want to see more videos like this one? Subscribe to know when we release new videos. Our intro music was created by Podcast Masters, check them out at www.podcastmasters.net The following links were used as sources for this video http://www.katu.com/blogs/weather/27184679.html http://physics.stackexchange.com/questions/136694/why-is-the-shape-of-lightning-or-an-electric-spark-a-zig-zag-line https://www.physicsforums.com/threads/why-does-lightning-zig-zag.179870/ https://answers.yahoo.com/question/index?qid=20101227214503AAwmbom The background music is Chan Wai Fat Dream and can be found at the link below.

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Why You Need to Balance Chemical Equations 

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Why You Need to Balance Chemical Equations 

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Chemical equations must always balance due to the principles outlined in The Law Of Conservation of Matter. This scientific law states that matter cannot be created out of nothing nor can it be destroyed. Therefore, the same amount of matter, in the form of atoms, must exist both before and after the chemical reaction.

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Volume of room - 350m3
Volume of average person - 0.95m3
Volume of three people - 0.285m3
Volume of objects in room - 0.8m3
Volume of room minus table & three people - 348.915m3
Volume of one breath - 0.0005m3
Breaths each person takes a minute - 16
Volume of breaths per minute - 0.008m3
3 people breaths per minute - 0.024m2
Oxygen in the room - 348.915 x 20% = 69.783m3
69.783/ 0.024 = 2,907.625m3
2,907.625/ 60mins = 48.46 = 48hrs 28mins

The three people will live for 48hrs 28mins

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We all have something called melanin in your skin. It gives your skin its color. People who have dark skin have more melanin. People who have light skin have less.
Our bodies normally makes melanin to try to protect the deeper layers of our skin from damage.
When our skin gets damaged by the sun's rays, it makes even more melanin to try to protect our skin from being damaged even more. That causes the skin to change color:
Dark-skinned people usually turn darker brown, or tan, when they go in the sun.
Light-skinned people usually turn more red, or burn, when they go in the sun.

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Some Common Metals and their Flame Test Colours

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Some Common Metals and their Flame Test Colours

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How to Balance Chemical Equations in 5 Easy Steps: Balancing Equations Tutorial

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Metals change the colour of a flame when they are heated in it. Different metals give different colours to the flame, so flame tests can be used to identify the presence of a particular metal in a sample. This is how you would carry out a typical flame test:

1. Dip a clean wooden splint in the sample solution.

2. old the wooden splint at the edge of a bunsen burner flame.

3. Observe the changed colour of the flame, and decide which metal it indicates.

4. Repeat steps 1 to 3 with a new sample.

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Why Do We Have Different Seasons? | California Academy of Sciences

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As Chile is situated in the southern hemisphere, its seasons are opposite to those experienced in Ireland.  Summer occurs from December to February and early March. Winterspans June, July and August.

http://www.climateandweather.com/weather-in-chile

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1. What is the physical appearance of the people in the room?
2. What is the volume of the room?
3. What percentage of the air in the room is oxygen?
4. How many breaths does each person take per minute?
5. What is the health status of each person?
6. What the the volume of objects in the room?
7. What is the volume of one breath?
8.  Where is the room?
9. Lethal level of CO2?
10. Lethal low levelof O2?
11. Volume of average person?
12. Volume of three people?
13. Volume of room minus table and three people?