Chemical Change Lab Report

Purpose: The purpose of this experiment is to observe chemical changes in common consumer products to determine if the chemicals are basic, acidic, or remain neutral when mixed with other chemicals.

Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

A Cobalt-Amine-Halide compound is synthesized from cobalt (II) chloride hexahydrate. An orange-tinted solid is produced and is considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown, its true identity can be predicted. Chloride, ammonia, and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia, respectively, are used. Silver nitrate is used to precipitate the chloride ions in the unknown, which can be measured to determine the percent composition of chloride

Matter is anything that takes up space and has mass. All matter is made out of many tiny atoms. Chemical change is substances that change into different substances. A physical change is a substance changing its appearance without rearranging how the atoms are bonded together. The law of conservation of mass states that matter is neither created nor destroyed by chemical or physical changes.

The chemical reactions that could be used to store energy are Decomposition Reaction (Invisible Ink) and Reversible Decomposition-- Combination Reaction (Dehydration of Blue Vitriol/ Rehydration of Copper (II) Sulfate). 2. The following reaction is exothermic, Heme-O2 +CO  Heme-CO+ O2 .

A physical change includes a change in the material without affecting its composition, such as the physical state change. However, a chemical change includes the change in the composition of the substance. The change in color, formation of a gas or a solid product, and the production of energy are the evidences of a chemical reaction, thus, of a chemical change.

Purpose: The purpose of this experiment was to observe the many physical and chemical properties of copper as it undergoes a series of chemical reactions. Throughout this process, one would also need to acknowledge that even though the law of conservation of matter/mass suggests that one should expect to recover the same amount of copper as one started with, inevitable sources of error alter the results and produce different outcomes. The possible sources of error that led to a gain or loss in copper are demonstrated in the calculation of percent yield (percent yield= (actual yield/theoretical yield) x 100.

First, we started testing solutions such as Water, Sodium Phosphate (Buffer), and Sodium Chloride. The two control solutions that were used in experiment were HCl which is an acid and NaOH which is a base. The purpose of the two controls is to test and determine if NaCl is a buffer or not. When HCl was added to NaCl the pH decreased from 7.60 to 2.53 pH. The comparison of the pH change of NaCl and Na3PO4, shows that when adding acid to Na3PO4, pH did not change dramatically as it did with NaCl, only decreased from 9.30 pH to 8.73 pH. Comparing the pH changes of water and NaCl, the results seems that both have dramatic decrease in the pH level. The results shows that NaCl acted more as a water because when HCl was added, the pH dropped from

The question the group was trying to answer is, “How Does the Total Mass of the Substances Formed as a Result of a Chemical Change Compare With the Total Mass of the Original Substances?” The purpose of this lab was to attempt to verify and observe the Law of Conservation of Mass, and the law of conservation of mass also states that matter is never created nor destroyed. The purpose of this lab was also to prove the the claim that the group made, “The total mass of the substance formed as result of a chemical change is the same as the total mass of the original substance. The group performed two experiments to answer the question and prove the claim.

During the experiment, the solution was agitated at 350rpm for two flow rates, 80 mL/min and 100 mL/min . As seen in Figure 1, the 100mL/min flow rate solution dropped in pH faster than the solution with a 80 mL/min flow rate. This was due to the solution not being saturated at 80mL/min and able to conduct a chemical reaction. Another important observation was that due to the lack of data, some of the trends had to be predicted for both flow rates. This can be observed in Figure 2 and Figure 3. Subsequently, it was predicted that the higher flow rate would have had a steeper slope.

Since there was an ionic compound such as salt, is the crystallized from a flowing solution as in salt water inside the test tube, so the solution will turned out to be dried. Also, since the crystal was heated therefore the mass of the solid may decrease as the water is discharged from it. Before and after heating the solid remain the same color as white powdery type of texture for the “Unknown A” is ZnSO4 x 7H2O. The differences between a physical change and a chemical change in matter of substances.

The purpose of this lab was to find that what chemical change has taken place, identify the type of reaction based on the reactants and products of a reaction, and describe reactions by writing word equations and balanced chemical equations.

A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?

Table 2: Consists of color extract taken from a red cabbage for a natural indicator. The pH reading that was measured by using the pH meter and the result of the pH reading to determine whether the solution was acidic or basic.