Chemistry: Questions And Answers

* Plants can remove metals from low grade ores. The metal can be recovered by processing the ash from burning the plants.

The initial concentrations of the reactants in Table 1—that is, [Fe3+] and [SCN–] prior to any reaction—can be found by a dilution calculation based on the values from Table 2 found in the procedure. Once the reaction reaches equilibrium, we assume that the reaction has shifted forward by an amount, x. Notice from Table 1 that the value of x is simply equal to the equilibrium concentration of FeSCN2+(aq), or that x = [FeSCN2+] at equilibrium. The equilibrium value of [FeSCN2+] is determined spectroscopically using Beer’s Law. Its initial value in the table is zero because no FeSCN2+(aq) is added to the initial solution. Finally, the equilibrium concentrations of the reactants, Fe3+(aq) and SCN–(aq), are found by subtracting the equilibrium concentration of FeSCN2+(aq) from the initial concentrations of Fe3+(aq) and SCN–(aq), as shown in the table above. Once all the equilibrium values are

either barium (Ba 2+ ) or calcium (Ca 2+ ). Part C consisted of a series of cation flame tests using metal

3. Examine the luster of the minerals in Figure 1.2 (p. 4 lab book). Place the letter A, B, C, D, or E in

Aluminium is one of the newest metals to be found only discovered in the 19th century with developments in chemistry and electricity. The late discovery compared to other commonly used metals is due to the fact aluminium does not occur naturally in its purest form. Because of this aluminium was very rare making it a precious metal valued more than gold. Nowadays aluminium is the most abundant metal elements on earth consisting of 8% of the earth’s crust. About 41 million tons is smelted each year and therefore is used in a wide range of applications. From auto bodies to food and beverage storage eg: soda cans as well as electrical cables to aircraft skins, aluminium is a very big part of our everyday lives.

1. Decide if the mineral is metallic or non-metallic based on its luster and streak.

c. All the formulas of the oxides formed by the alkaline earth metals and lead

Due to these factors, this graduate student supplies a rating of ‘3’ concerning this element.

The purpose of this experiment was to classify unknown solids based on their type of chemical bonds by investigating their properties. By using data, Unknown 1 was classified as a metallic. This was because it appeared a shiny copper color, had a very high conductivity as a solid, had a high melting point, and was malleable. Unknown 2 was classified as a nonpolar covalent bond. This was because it had no conductivity as a solid and low conductivity in water.

Hypothesis: Reaction 3 will create the highest exothermic reaction in the test tube this is because the chemicals are highly flammable the means they are high in exothermic relations. If we use 4 grams of zinc powder the chemical retain with the copper sulphate solution will create the highest temperature We changed the

Nonmetallic properties tend to predominate for elements at the far right portion of the table.

I started with elemental copper metal and then reactions occur step by step as follows:

Over 2/3 of all aluminum ever created is still in use. Most of the 1/3 not still in use is aluminum cans in landfills.

The main objective of this experiment is to carry out qualitative analysis to identify metal cations in unknown solution 1.

The main purpose of this experiment was to show that single displacement reactions between metals according to their reactivity, with more reactive elements having the power to displace less reactive elements and take their place in a chemical compound (Beran, 2014). This was supported by the results of the experiment, where solid metals were combined with aqueous solutions that contained another element, and reactions only took place when the solid metal was more reactive than the other element in the compound. Only three attempted trials resulted in a failure to produce a reaction, namely the combinations of copper with hydrochloric acid, and copper with nickel sulfate. The outcomes of these trials are justifiably reasonable because copper is ranked lower in the