Some compounds have very distinctive colors when burned, such as Potassium, which is a white/purple, and sodium, which is a deep red hue. The first step for a flame test is to gather the needed materials. These include beakers, distilled water, the unknown substance, a Bunsen burner, matches, a nichrome wire, tubing to connect the gas line to the Bunsen burner, goggles, and known compounds to compare with. The first step is to make aqueous solutions of all the substances to be tested. This is done by adding .5
Throughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and
In addition, properties such as color and magnetism provide additional identification. Keywords: combustion, steel wool, iron, magnetite, ferric oxide When a candle burns, the wax disappears. When wood burns, the wood is reduced to ash to about ten percent of its
Part A When sodium was added to water, the sodium melted to form a ball that moved around on the surface of water rapidly and hydrogen gas was produced. Because of the amount of heat liberated during this exothermic reaction, the hydrogen gas ignited the sodium with an orange flame while floating on the water. Also, when potassium was put onto the water, the observation was similar to how sodium reacted towards water. The metal was also set on fire, with sparks and a lilac flame. But, in the case of speed of tarnishing between the two elements, potassium was faster than sodium.
Purpose: To recognize the evidence of a chemical change and to prove the law of conservation of mass by observing a series of chemical reactions involving copper. A specific quantity of copper will be transformed through a series of chemical reactions to form new substances and then recovered as solid copper. A percent yield will be calculated to determine the amount of copper recovered from the chemical reactions.
The substance or substances can convert into different substance or substances as a result of a chemical reaction. Some common indicators of a chemical reaction we discussed in class are, color change, forming of new substances, and energy being released, A physical change is when the original substance is still the same substance after the change. However, the physical form of the substance can be changed. For example, paper can be ripped into small pieces, the paper is still the same material but the form of it is different. An example from one of the reactions is when baking soda and acetic acid were mixed.
Therefore, the candle’s mass stayed the same, and part A demonstrated a physical change since the candle could be put back into its original state if someone tried very hard to do so. Part B however, was a little bit different. In this experiment
Reactions in Our World Lab Report Instructions: In this laboratory activity, you will be comparing chemical reactions to nuclear reactions by observing chemical phenomena in action. To prepare for your observations and data collection, you must complete the pre-lab activity worksheet that goes with this lab. Otherwise, you will not have the chemical equations you need to match each chemical reaction. Fill in each section of this lab report and submit it to your instructor for grading.
But, when you bleach a shirt, the bleach breaks down the stain. The molecules are changed. This could include atoms, ions, compounds, or molecules of a single element. Chemical reactions can happen with anything, as long as chemical change occurs.
The cornstarch began to burn, which produced smoke, and is what also perhaps changed the color of the
Q22. Can you give an example of a chemical reaction? Sodium chloride Chlorine is a harmful green gas when it is on it’s on its own and sodium is a highly reactive metal. When they are mixed together they make table salt.
The color of the flame help in determining the compound. Unknow #3 is Strontium chloride because they have almost same color flame. They both produces red color.
Also, in a chemical reaction, bonds between atoms in the reactants are broken, and the atoms rearrange and form new bonds to make the products. Atoms or Molecules can then be combined to form many different substances. A substance is a sample of matter that has a constant structure, and the substances mass will always stay the same. Chemical reactions allow for the attributes of a substance to
A physical reactions goes into a physical change of substance. It does not change the composition normally. Physical reaction in a substance does not change what the substance should be. chemical change forms a chemical reaction, new substances are formed, and the energy is either giving off or absorb. Elements is a substance made of the same atomics.
A chemical reaction is a process in which one or more reactants are converted into products. Chemical reactions are classified into five main reaction types: synthesis, decomposition, single replacement, double replacement, and combustion. The type of chemical reaction can also be classified in one of two ways: oxidation-reduction or non-oxidation-reduction reactions. Based on my recollecting of prior knowledge and recent studies to obtain background information for this particular lab, I was able to design a hypothesis that I feel incorporated the main aspects of my background information.
