Physical Properties Lab

Introduction
In this lab, changes in substances were observed and classified as a physical or chemical change. A physical change is a change in the physical properties of matter. A physical property is a characteristic of a substance that can be observed and measured without and changing the identity of the substance. Physical properties can be observed with a qualitative observation, which is an observation that uses a description with only words, or quantitative observation, an observation that uses measurement and words to describe something. Some examples of a qualitative observation include colour, texture, odour, state, and lustre. Examples of a quantitative observation include viscosity, melting or boiling point, solubility, density

Materials and Apparatus The first station was station 7, where sodium bicarbonate (NaHCO3) and acetic acid (CH3COOH) were mixed. The materials needed for this station were sodium bicarbonate, acetic acid, a clean test tube, a test tube rack, ruler, sink, test tube brush and a scoopula.
Safety Precautions Some safety precautions that were taken during this lab were wearing goggles, keeping the work area clear, and tying hair back. It was necessary to wear goggles because the chemicals could have come out of their containers or tubes and come into contact with eyes. Since the eyes are a very sensitive part of the body, it was important to keep them protected. It was necessary to keep the workspace uncluttered so that there was enough space to the lab and so that there were no spills. Finally, it was important to tie back hair so that hair does not come into contact with chemicals and become damaged or contaminate the mixture.
Procedure
First, 1-2 cm of acetic acid was poured into a clean test tube. Next, a small amount of sodium bicarbonate was examined using a scoopula, before being added to the test tube. Then, observations about the changes were recorded. Finally, the materials were disposed of into the sink and the test tube was

When hydrochloric acid and magnesium ribbon were mixed, it was a chemical change because gas was produced as shown in the bubbles, and there was also heat. When sodium hydroxide and copper sulfate solution were mixed, it was a chemical change because there was a jelly-like substance formed in the middle, which was a precipitate. When sodium chloride and water were mixed, it was a physical change because there was no heat, light or gas produced, it stayed the same colour, the sodium only dissolved. When copper sulfate solution and steel wool were mixed, it was a chemical change because there was a completely new colour created, a pink-copper colour. When hydrogen peroxide and manganese dioxide were mixed, it was a chemical change because gas was produced, which can be seen in the bubbles that formed. When water and potassium permanganate were mixed, it was a physical change because no gas, heat, or light was produced, and the water turned purple, but no new colour was produced. Finally, when sodium hydroxide and phenolphthalein were mixed, it was a chemical change because a brand new purple colour was