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The chemical compound hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride gas (HCl). It is a strong acid, the major component of gastric acid and of wide industrial use. Hydrochloric acid must be handled with appropriate safety precautions because it is a highly corrosive liquid.

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The angle of the sun during the different seasons

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The angle of the sun during the different seasons

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The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later. In between these, Spring and Autumn will occur. The North pole always points the same way as the Earth revolves around the Sun. The Earth's movement around the sun causes the seasons

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Results of the rate of oxygen production

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Results of the rate of oxygen production

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HCl + NaOH ---> NaCl +H₂0

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Tutorial Titration of Hydrochloric Acid and Sodium Hydroxide

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A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
An example of a catalyst used in science class is MANGANESE DIOXIDE

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EXPERIMENT to monitor the rate of reaction of OXYGEN from HYDROGEN PEROXIDE using MANGENESE DIOXIDE as a catalyst 

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EXPERIMENT to monitor the rate of reaction of OXYGEN from HYDROGEN PEROXIDE using MANGENESE DIOXIDE as a catalyst 

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Acid + Base = Salt + Water
HCl + NaOH -> NaCl + H₂O

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TITRATION OF HYDROCHLORIC ACID WITH SODIUM HYDROXIDE 

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TITRATION OF HYDROCHLORIC ACID WITH SODIUM HYDROXIDE 

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titration of hydrochloric acid with sodium - Bing video

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Hydrochloric Acid Mixed In the Stomach Hydrochloric Acid Hydrochloric Acid Skin Serum Hydrochloric Acid Uses Hydrochloric Acid Rust Removal Hydrochloric Acid Burns Hydrochloric Acid in Food Hydrochloric Acid to Clean Tube Hydrochloric Acid Supplements Nitric Acid and Steel Sodium Chloride Stomach Acid Sulfuric Acid Phosphoric Acid Acetic Acid

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2HCl+ Na2 CO₃  ->  2NaCl+ H₂0 + CO ₂

Fe + 02  ->  Fe₃O₄

3Fe+ 2O₂  ->  Fe₃O4

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How much air is in the room? 134.2
Volume of the room 134.2
Volume of objects in the room. 0.8m2
How big is the room? 10 x 7 x 5
height of the people 185cm height
What percentage of the air is oxygen? 21%
How many breaths do they take altogether per minute?16 each  48 each.
Volume of one human breath 6 litres                           room dimensions
volume of oxygen in breath 0.3L                                   L - 10
lethal low level of co2 10% death in 30 minutes        D - 5

lethel low level of oxygen 10%                                       W - 7

Would dehydration kill you quicker than lack of oxygen? no
What happens if someone has a panic attack?
Are they stationary or are they moving?
Where in the world is the room?
If one dies first?
VOLUME OF A HUMAN BODY 95 LITRES

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Inside each handmade firework are small packets filled with metal salts and metal oxides, which react to produce an array of colors. When heated, the atoms of each element in the mix absorb energy, causing its electrons to rearrange from their lowest energy state to a higher "excited" state.

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When burnt, salts produce different colored flames. the salts we tested were;
Strontium Chloride
Lithium Chloride
Sodium Chloride
Potassium Chloride
Barium Chloride
Copper Chloride

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North Carolina School of Science and Mathematics