2. When the magnesium ignited, removed it from the flame and held it over an evaporating dish or a pyrex watch glass until the metal had burned completely. Let the product fall into the evaporating dish.
During the immersion of the magnesium metal in the hydrochloric acid solution, white bubbles could be seen escaping the surface of the metal as gas was produced during the reaction. Depending on the temperature of the hydrochloric acid and the overall molar concentration, the rate of reaction differed but the same signs were shown. During the reaction between the magnesium metal and higher concentrations of hydrochloric acid, it was observed that the test tube grew quite warm to the touch. As the immersed magnesium strip sank down, it appeared coated in a layer of white bubbles that fizzed like a carbonated drink. In the lower concentrations of hydrochloric acid, the strip spent some time floating at the surface of the solution in the test tube, later sinking down to the bottom as the
The substance I would have to say was the ball formation of the pyrite and the air bubbles in the water.
The wet, crude product was placed into the 50 mL Erlenmeyer flask. Small amounts of CaCl2 were added to dry the solution. The flask was sealed and the mixture was swirled and left to settle. Once
The term concentration refers to the amount of a substance present in a certain volume of liquid or gas. Increasing the concentration of the reactants will increase the rate of the reaction. If the concentration of a reactant in a solution is increased, there will be a greater number of particles in a given volume of solution. This means the particles are more likely to collide and therefore react when there are more of them. Collisions between particles are necessary for the reactants to rearrange and form the products. In this experiment, the rate of the reaction between magnesium ribbon and hydrochloric acid will be increased by adding a higher concentration of hydrochloric acid each time. The chemical equation between magnesium ribbon and hydrochloric acid can be written as:
The lime water turned into white opaque color, and gas bubbles and white precipitate was formed, as placed the open end of the gas delivery tube(reaction between Alka Seltzer tablet + water) into the limewater.
Cyclohexane (10ml, 7.78g, 0.0924mol) and pyridinium hydrobromide perbromide (9.39g, 0.0294mol) were put into 50ml round bottom flask. The initiator AIBN of 0.1g was carefully added to the flask along with a boiling stone. Simple reflux was setup, and the mixture was refluxed gently for 30mn. White fumes of HBr can be seen on top of condenser can be proven by pH test turning to pink, which indicated that the reactions occurred. Then, the flask was allowed to cool for 15mn. Another small portion of AIBN (0.1g) was added, and
Fill the spray gun cup with water. Hook up the compressed air hose to the air inlet fitting on the spray gun. Make the following basic adjustments to the spray gun: set the fan wide open, turn the material adjustment knob to expose one thread, and set the air pressure to 10 psi at the inlet for HVLP spray guns and 35 psi at the inlet for conventional spray guns.