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.

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.

First let's start with with something simple Chemical Changes most Chemical Changes take place on the molecular level. Chemical change produces a new substance. For example another way you can think of it is that a chemical change accompanies a chemical reaction grat examples of chemical change are combustion in other words burning, cooking an egg is also a great example of chemical change also rusting of an iron pan, but for a more detailed chemical change a great example would be mixing hydrochloric acid and sodium hydroxide to make salt and water.

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 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?

When the zinc was dropped in the hydrochloric acid, the substance began bubbling vigorously, forming a precipitate. Eventually, the zinc dissolved completely. After the lit wooden splint broke the surface of the test tube, there was a loud popping noise. The gas that was released was hydrogen from the acid and the popping noise was a result of the Hydrogen being burned up by the fire creating a small explosion. Two chemical changes occurred in this test: one with the formation of a precipitate (a textbook sign of a chemical change), and the other when the explosion

| Can see particles of both. When mixed with water salt dissolves and sand is left.After filter sand is left and salt-water goes through.After evaporations of salt-water, salt is only left in dish.

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.

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.

A chemical change is a change that alters the identity of a substance. A chemical change can be identified by five things: change in mass, formation of a precipitate, release of heat and/or light, color change, or giving off gas.

1. What type of macroscopic evidence for chemical change did you observe during this experiment? Give at least three different examples.

There are five clues that help indicate if a chemical change occurs. The clues to a chemical change include a change of colour, the forming of a precipitate, the forming of gas bubbles, the production of heat or light, and if the change is difficult to reverse. In the chemical reactions lab, several chemical changes will occur. Participants must use this knowledge to decipher what change has occurred after the chemical

During the preparation of the, “Turning Pennies Green”, lab, students were asked to perform an experiment at home. The lab demonstrates what the effects of chemical and physical changes are. Students were asked go home, put two pennies in separate bowls, and label one bowl cup A, water and cup B, vinegar. Then, they were asked to place paper towels in the bowl. For cup A, water was to be poured in, but just enough to wet the paper towel inside, so the penny was not submerged.

A chemical change can be defined as a usually irreversible chemical reaction that results in the formation of one or more new substances with different chemical properties and compositions from the original material. Some signs of a chemical change can include changes in color, the formation of a precipitate (a solid

When mixed with a variety of liquids, each substance reacted differently. For example, only baking soda reacted with a chemical change when mixed with vinegar. It fizzed when they both mixed. A physical change happened when the powders were mixed with water. When baking soda was mixed with iodine, it created a physical change because it did not make the iodine change to an unexpected color, it stayed yellow.