The purpose of this experiment is to understand how two different reactions can lose mass in a chemical reaction, and to learn how to arrive to the results in an organized way of recording data. The two balanced equations that we worked with were: NaHCO_(3(s))+HCl_((aq) )→NaCl_((aq))+CO_(2(g))+H_2 O_((l)) and; Na_2 CO_(3(s))+2HCl_((aq))→2NaCl_((aq))+CO_(2(g))+H_2 O_((l)) The procedure to obtain the mass lost for these two reactions was to first calculate the mass of HCl. For the first reaction, which was sodium bicarbonate, the mass of the beaker was weighted, then the grams of NaHCO_3 were added to the beaker and the mass was weighted. After recording the mass of the beaker with the NaHCO_3, 25 mL of HCl were added to the beaker and the mass after the reaction was weighted. To determine the mass lost in the reaction, the initial mass of the reagents was subtracted with the final mass of the reagents. The same procedure was performed with the sodium carbonate reaction, however 50 mL of HCl were used instead of 25 mL. Each chemical reaction was …show more content…
Because the value in the theoretical mass of CO_2 lost in the first run was 0.566 g and the mass obtained from the experiment was 0.618 g. This shows that 0.618 g was close to the theoretical value and it had a 9.11% error. On the other hand, the values of sodium carbonate had a greater percent error (22.2% and 39%) which meant that there was a big difference between the theoretical expectation and the actual mass obtained. Some discrepancies that could of cause the values to differ are the grams of NaHCO_3 and Na_2 CO_3 added to the beakers because some values were close to one gram or a little more than a gram. Another discrepancy is that some of the HCl might have stayed in the volumetric pipette; therefore this would of affected the weighted mass of the beaker with the
6-3: This process is used by cells to manufacture _biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products__
If the amount of baking soda used in this experiment increases (0.2 g, 0.4 g, 0.6 g, 0.8 g, or 1 g), then the volume (mL) of the carbon dioxide released from the decomposition will also increase. In any chemical reaction, the atoms of the reactants are rearranged to form the product. Thus, as particles cannot be created or destroyed, the mass of the carbon dioxide released cannot increase or decrease unless the mass of the baking soda is changed.
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?
Aim: The aim of the lab “Chemical Equilibrium” is to observe the effects of changes in concentrations of products and reactants on the position of the equilibrium of given chemical reactions.
What is the percentage yield of the reaction of iron and copper chloride when steel wool and copper chloride dehydrate are used as reactions?
Substances A and B have an appearance of a white solid like. Substances A and B were put into a test tube and on the Bunsen burner. As a result, B melted faster than A. A was slow to melt. The reason why B melted faster than A is because it has a lower boiling point than substance A which made it melt faster. It also shows that A needs more energy than B to be broken down.
Purpose: The purpose of this lab activity is to help understand observation and interpretation and to distinguish one from another all while analyzing the chemical reaction. You will see what happens when you put a beaker with water in it and then put dry copper and after that put aluminum foil in and see the observations and interpretation in the chemical reaction.
1. Place a small amount of wax from a birthday candle into a test tube. Heat gently over a burner flame until the wax melts completely; then allow
Record the mass of the sodium chloride in the data table. If it is too small to read, click on the
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.
In this experiment it was observed that not all chemical reactions occur at the same rate. Chemical reactions occur when one or more substances are changed into other substances. The properties of a chemical reaction require three things. First, they need a source of energy for molecules to encounter each other. Second, they require to proceed at a steady rate. Third, they must proceed in a particular direction until they reach equilibrium. There are two types of chemical reactions that can occur: endergonic and exergonic reactions. In these reactions there are both reactants and products. In exergonic reactions the reactants (starting materials of a reaction) are higher than the products (results of a reaction). This is opposite for endergonic
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.
2. Calculate the mass of the reaction mixture in each reaction first by determining the volume of the solution and then assuming that the density of the solution is the same as pure water (1.0g/ml). Show work here and record your answer in Data Table 2.
Chemical equilibrium is the study of change within a chemical reaction and how far it will go to reach a dynamic equilibrium (Burdge). Dynamic equilibrium is defined as the constant movement of species in a chemical reaction, gone to incompletion while the rates of production and consumption are equal (Kf = Kr ) (Burdge). It differs from static equilibrium in that species are constantly being consumed and produced, it is dynamic movement (Fox). The concentration of such species do not change, it remains constant (Fox). The rate at which species are being consumed and produced is known as the equilibrium constant (K) (Burdge). Due to the fact that the concentration
The purpose of this lab was to test the law of conservation of mass by comparing the total mass of the reactants in a chemical reaction with the total mass of the product.