https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw en-us 2016-11-29 11:22:42 UTC 2023-04-09 01:51:09 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rocket.png 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140453492  Titration is a technique used to determine the unknown concentration of a known solution. 

The aim of this experiment was to use a standard solution of Sodium Hydroxide to distinguish between two samples of Hydrochloric acid of different concentrations.  ]]> 2016-11-29 11:28:55 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140453492 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140457632 Step 1: Set up apparatus as shown.
Step 2: Add a few drops of phenolphthalein indicator to the NaOH in the conical flask.
Step 3: Allow the HCL to flow from the from the burette into the NaOH in the conical flask
Step 4: Add the HCL drop by drop until the solution in the conical flask changes colour. 

]]> 2016-11-29 11:51:12 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140457632 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140459893 Neutralistion occurs when an acid and base react. Salt and water are formed during this reaction. ]]> 2016-11-29 12:06:10 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140459893 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140460951 1st titration: 26
2nd titration:25.5

Average titration volume:25.75  ]]> 2016-11-29 12:13:25 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140460951 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140461526 1st titration: 49.5
2nd titration:50

Average titration volume:49.75]]> 2016-11-29 12:16:43 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140461526 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140462068 The Space Shuttle Columbia disaster occurred on February 1, 2003, when Columbia disintegrated over Texas and Louisiana as it re-entered Earth's atmosphere, killing all seven crew members.]]> 2016-11-29 12:19:37 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140462068 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140462510 All 7 members of the crew where killed during the disaster.]]> 2016-11-29 12:21:41 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/140462510 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141875261 Mucous-producing cells at the neck of the gastric pits create a layer of protective mucous covering the stomach lining. This mucous layer includes bicarbonate ions which act as a chemical barrier against the protons in gastric acid. ]]> 2016-12-05 20:18:57 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141875261 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141876950 Mach 1 = 1062 km/h
Mach  is the speed at which sound travels at. 

When the Space Shuttle Columbia crashed it was travelling at Mach 24.1 at the time of their re-entry into the Earths atmosphere.]]> 2016-12-05 20:25:01 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141876950 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141894229 Hydrogen peroxide naturally breaks down into oxygen and water but this reaction could take a while so we used manganese dioxide as the catalyst.   ]]> 2016-12-05 21:53:18 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141894229 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141934827 A catalyst is substance that cause a chemical reaction to speed up or slow down. the substance is not used in the reaction. ]]> 2016-12-06 07:29:51 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141934827 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141973414 Snow occurs when water vapors in the air freeze before they can turn into water. This happens when the temperature in the clouds is very cold. Snowflakes are made up of crystals of ice that have formed around bits of dirt in the air. The snowflakes start out very small and grow. Each snowflake is different and might contain up to 200 crystals.]]> 2016-12-06 11:41:08 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141973414 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141974776 2016-12-06 11:51:03 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141974776 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141975303 2016-12-06 11:55:21 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141975303 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141976320 2016-12-06 12:02:28 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141976320 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141977709 Daddy's Silly Triangle ]]> 2016-12-06 12:11:57 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141977709 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141978546 The aurora borealis (northern lights) form when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. These collisions result in countless little bursts of light, called photons, which make up the aurora. Collisions with oxygen produce red and green auroras, while nitrogen produces the pink and purple colors. This reaction encircles the polar regions of the earth and occurs at an altitude of 40-400 miles (65-650 km) in a zone called the "Auroral Oval."]]> 2016-12-06 12:17:01 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141978546 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141978989 After 30 seconds the volume of oxygen = 20cm3 
After 60 seconds the volume of oxygen = 40cm3 
After 90 seconds the volume of oxygen = 50cm3 
After 120 seconds the volume of oxygen = 60cm3 
After 150 seconds the volume of oxygen = 75cm3 
After 180 seconds the volume of oxygen = 85cm3 
After 210 seconds the volume of oxygen = 100cm3 ]]> 2016-12-06 12:19:59 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141978989 13zcarolankelly_occ https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141980521 2016-12-06 12:31:03 UTC https://padlet.com/13zcarolankelly_occ/4xcrcmwlqcbw/wish/141980521