Based on our observations from the Zinc and Hydrochloric Acid Lab, we concluded that the chemical reaction that occurred was exothermic and a single displacement reaction. The experiment consisted of zinc (Zn) and hydrochloric acid (HCl) being mixed in a test tube immersed in water. First of all, bubbles were produced during the reaction. Also, a white powdery substance was produced with properties different from those of any reactant. The bubbles suggest that the reaction was a chemical…
Atomic structure AC1.1 1. Produce a table showing each sub-atomic particle with their relative masses and charges (Bbc.co.uk 2015). Particle Relative Charge Relative Mass Proton +1 1 Neutron 0 1 Electron -1 2. Explain the meaning of the terms, ATOMIC NUMBER and MASS NUMBER of an atom in terms of sub atomic particles. The atomic number refers to the number of protons in an atom, the mass number refers to the number of protons plus the number of neutrons (Bbc.co.uk 2015). 3. A…
solvent.” Observation showed that many salts and sugars were able to fully dissolve in the water solvent, but corn oil did not (Figure1).The reason salts would dissolve into water solvent because water molecule carried partial positive charge on hydrogen atom and partial negative charge on oxygen atom; they could react with cation and anion from salts that have ionic bonds (Reece, etc. 2011). Therefore, salts such as sodium chloride magnesium sulfate would fully dissolve. Our data indicated that…
) (a) Carbon (b) Hydrogen (c) Nitrogen (d) Oxygen (e) Sulfur (f) Phosphorus My answer is (a) (b) (d) (2:19:54 PM) 2. Which of the following elements can be found only in proteins? (Check all that apply.)…
Solar cores of high temperatures, generate energy quicker, therefore higher temperature stars are more luminescent. Stars located on the main sequence, referred to as “dwarfs”, must generate power through hydrogen and helium nuclear fusion in their solar core and be in thermal equilibrium, the balance between luminosity and energy generation, and hydrostatic equilibrium, equality between pressure and gravity. Following the mass-luminosity relationship, hot…
happening all the time and you don’t even know it. Some of the ways that the elements are distributed throughout the body are in the bones, blood, metabolism, genetics, and even diseases. In fact, the human body is composed of 65% Oxygen, 18% Carbon, 10% Hydrogen, 3% Nitrogen, 1.5% Calcium, and in smaller amounts of several other elements. Bones make up the skeleton of the human body. They are composed of a collagen rich mixture of calcium and phosphate, which are both elements located on the…
Water and ethanol both have dispersion forces and hydrogen bonding while kerosene only has dispersion force. It means to say that there is a greater energy needed in order to break the bond that holds the molecules together. In conclusion, intermolecular forces increase direct proportionally with increasing polarization. It should also be noted that the arrangement of the strength of intermolecular forces increase from dispersion, dipole-dipole, hydrogen bonding, to ion-dipole. Lastly, the…
test tube which indicates the formation of gas. After the reaction, the HCl solution appears to still have bubbles in its presence and the zinc metal is fizzing. In this reaction, the zinc reacts with the hydrochloric acid to form zinc chloride and hydrogen gas (equation 10). For the first double replacement reaction, barium nitrate Ba(NO3)2 is combined with sodium hydroxide NaOH. During the reaction, the mixture is cloudy and white while there are small particles of precipitation in the…
forms of Isonicotinamide (I, II and IV) were crystalized using solvents such as nitrobenzene, acetone, nitromethane, methanol, ethanol, 2-propanol, dioxane and chloroform. It was found that the hydrogen bonding behaviour of Isonicotinamide is of interest since different polymorphs exhibited different hydrogen bonding and molecular…
The Pk value for this equilibrium system is 6.3. It is evident that the pH is dependent on the concentration of hydrogen carbonate ions (HCO3-) and the concentration of carbon dioxide (CO2) in the air above the pool. equation 7 For optimal buffering capacity the ph of the pool (recommended to be 7.2 – 7.8) should be kept within one pH of the Pk value of the…