Chemical vs Physical Change Lab

3. Carefully felt the sides of the test tube and observed the resulted chemical reaction for about 30 seconds.

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.

In this investigation we will see some chemical changes such as formation of gas, temperature changes, solid formed, color change occurs or a new odor produced and physical changes such as freezing, melting, dissolving evaporating.

A physical change is one that affects only the physical properties of a substance, while a chemical change alters a substance at the molecular level.

In this experiment you will observe some physical and some chemical changes. You will observe that energy must be used to start some chemical reactions, and that it is produced in others.

Objective : To demonstrate the differences between physical and chemical changes while observing the laws of conservation of matter and energy.

The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical.

A chemical reaction is a process that involves change of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. The key concepts of a chemical reaction are:

There was an assortment of different changes indicating that chemical changes were taking place such as change in color or chemicals bubbling when combined with another chemical.

4. The following examples do not always indicate chemical change. For example, change in color will always indicate chemical change because the color changes but it does not change the substance’s physical properties. The apparent loss in mass is a phase change; therefore the entire substance goes through a physical change. The apparent disappearance of a substance is a chemical change and will always be a chemical change because it might result of a soluble substance dissolving in a liquid and changes the entire substance in a chemical phase.

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.

Chemical change results in one or more substances of entirely different composition. Chemical change requires a chemical reaction.

An example of a chemical change that one could come into contact with daily is rust. Air and iron are the reactants in this situation while rust is the product. The chemical equation for this reaction would look roughly like this, O+FE= OFE or rust. This is clearly a chemical change because you cannot reverse it meaning you cannot take rust and pull out the iron to leave air or vise versa. All chemical changes are finite. One other example of a chemical change is the burning of any substance. For example if one were to burn a sheet of paper it would create ash. This chemical change is finite because you cannot change ash back into paper.

Physical and chemical changes are all around us such as that breakfast you had this morning. “Physical changes cause substances to change form… chemical changes produce a new substance… Some signs of an energy transformation include changes in color or odor, the production of gas or a solid, and the release of heat.” (Paragraph two) The goal of this investigation was to see the differences and inference physical and chemical changes. Our guiding question throughout the experiment was “Which changes are examples of a chemical change, and which are examples of a physical change?”