Put the entire tube in the bottle and replace the cap. As long as the sweets are protected from the soda by the foil, the reaction will not take place. Now shake the soda bottle well and unscrew the cap slightly until you hear a hissing. Throw the bottle into the air so it will hit the ground at a decent velocity. The impact will speed up the reaction and knock the lid off the bottle, which will be propelled up into the
Sodium hydroxide was again drawn up using the pipette, to above the graduation mark, where the meniscus was allowed to fall until the bottom of it was rested on the graduation mark when viewed at eye level. 6. The sodium hydroxide was then run from the pipette into a conical flask where after all the liquid had run out, the tip of the pipette was touched against the bottom of the flask and withdrawn soon after. This was then repeated with the second conical flask. 7.
Without the aid of cooling mechanisms they would consequently, fire in short rather than sustained bursts. Water jackets were made to help cool the gun, which held around one gallon of water. Water cooled machine guns would still overheat relatively quickly, sometimes within two minutes, therefore large supplies of water would need to be on hand in the heat of a battle. When these ran out many times a crew to solve the problem by urinating into the
The density, The boiling point. Observations First Trial The streams of bubbles initially made me confused because there were more bubbles in the water bath, and after I cooled down the set up the entire unknown liquid had evaporated, which meant that I had passed the boiling point a long time ago but did not notice, this happened when the setup was heated up to 100oC. Second Trial The unknown liquid is transparent and volatile. Rapid streams of bubbles appear at 74.0oC when heating During cool down the streams reduce, and the unknown liquid is sucked into the capillary tube that is placed in the test tube of the unknown liquid at 65oC. Third Trial Rapid streams appear at 67oC, and the unknown rose into the capillary tube at 65oC.
The second experiment, procedure 1, combined [Co(NH3)5 (H2O)]Cl2 (0.0060M, 1.52g) and (25mL) of distilled water to an 125mL Erlenmeyer flask. The flask was gently heated (dial 5-6) and stirred until all the compound was dissolved. The heated solution was then vacuum filtered through a fritted funnel and the filtrate was cooled in an ice bath until the
When you hit the cold pack, it breaks the tube so that the water mixes with the fertilizer. This mixture creates an endothermic reaction—it absorbs heat. The temperature of the solution falls to about 35 F for 10 to 15 minutes. How a heat pack works. Most heat packs contain supersaturated solution of sodium acetate.
Determining the enthalpy of the Solution for Sodium Hydroxide (NaOH) and water (H2O) Introduction: The aim of this investigation is to determine the enthalpy of the solution created from dissolving Sodium Hydroxide (NaOH) into water (H20) by the application of the principles of calorimetry. NaOH(s) + H2O(l) → Na+ + OH- + H20 + HEAT Relevant Theories: * When a solid ionic compound is dissolved in water, a change of enthalpy is involved1 * In exothermic reaction2: * System always loses energy * The change in enthalpy is always negative * Temperature always increases (Everything is opposite for Endothermic reaction) Explanation to Theories: * When a solid dissolves in water, the process will always have energy change associated with it, this is because the positive and negative ions of the salt will interact with the water molecules. Therefore it is true that when a solid ionic compound is dissolved in water, a change of enthalpy is involved. * These theories for the exothermic reaction are true because bonds are constantly being formed in exothermic reactions. When bonds form, energy is required, hence the system will always lose energy.
Swirl the flask to ensure that all the pellets have dissolved. Shake the solution well until it has turned clear. Method Ensure that the burette is clamped into the burette stand and the tap on the burette is closed. Use a funnel to fill the burette with Sulphuric Acid, make sure that the meniscus is level with the zero mark. Use a funnel to fill the measuring cylinder to 25ml with Sodium Hydroxide Solution.
1.1 Title: Investigating Viscosity 1.2 Research Question: How does varying the temperature (15 C, 30 C, 45 C, 60 C, 75 C) of 300cm^3 of cooking oil affect its viscosity, calculated by measuring the average velocity of a steel ball weight of 5g, falling through a 300cm^3 glass tube (25 cm in length)? 1.3 Scientific background: The intermolecular forces between the liquid molecules affect the viscosity of a liquid. As temperature increases, the intermolecular forces are weakening and some of them are overcome. Thus, the viscosity of cooking oil will decrease with an increase in temperature. As the liquid is more viscous, the ball weight would be experiencing more resistance in its motion and would thus have a lower average velocity.
In cold climates, a dryer is usually required to dehydrate the gas stream. The gas dryer, sometimes, is also necessary in warmer climates as well. Some gas dryers work at low compression pressure. To remove water vapors to extremely low levels, the molecular sieve adsorbent desiccants are used for gas dryers with low pressure. After a certain period of operations desiccants are required to be repaired or completely replaced by a new one as they have absorbed a huge amount of water contents in them and functioning capacity will be decreased, if not replaced.