Chemistry Cake Testing Lab Report

e) Meat darkening when it is heated on the grill is a chemical property because it describes a behaviour of a substance during a chemical reaction. The raw meat is being changed into cooked meat, the proteins are being altered.

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.

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.

The Ancient Greeks were the firsts to speculate on the composition of matter. They thought that it was possible that individual particles made up matter.

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:

Hypothesis: If we use these materials and use magnets, water, burners, and filters on the mixtures and elements given we should determine what kind of effect these materials given will have on these mixtures and elements, physical or chemical.

The objective of the experiment was to observe different reactions with different chemicals. The experiments emphasized on the chemical changes occurring in acids and bases as well as color changes and bubble formations. The experiments allowed for a better understanding of the undergoing chemical changes in mixtures. Some mixtures instantly changed colors while others were transparent or foggy. Some mixtures produced thick color that created solids called precipitates. Mixtures KI + Pb(NO3)2 and NaOH + AgNO3 both produce noticeable precipitates after a while. It was interesting to see the different acidic and base reactions like the fuchsia color formation in NaOH + phenolphthalein.

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.

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.

Chemical and physical properties of substances are due to the structure and arrangement of atoms, ions or molecules and how these interact with each other

Define physical change. . A chemical change is usually reversible change in the physical properties of a substance, as size or shape.

We discovered that the acetic acid reacted only with baking soda and sample #2. The acetic acid did not react with the sucrose or the table salt. During the conductivity test, the conductivity meter showed that the aqueous form of each substance, sample 2 included, conducted electricity. As the conductivity test produced no conclusive data, we based our determination of sample 2’s nature on the reaction with acetic acid. Sample 2’s reaction was only comparable to that of baking soda, leading us to believe sample 2 is indeed baking

A physical change is when you can change it back without a reaction. A chemical change is when you need to make a reaction to separate them. In experiment 1 it was a physical change because the sulfur and iron filings were just a heterogenous mixture. In experiment 2 it was a physical change because when we poured the liquid in the the warm water we just cooled it off into a solid so it didn’t have a chemical change. In experiment 3 it was a chemical change because it had a temperature change and a gas exchange happened. In experiment 4 it was a chemical change because it had temperature change and gas exchange. In experiment 5 it was a chemical change because it formed a precipitate and it changed color to white. In experiment 6 it was physical change because it was salt water which can be

Physical changes can be seen through an altering of the substances physical property. A substances physical property is observed and measured without changing the composition of the subject. Descriptive words that would help to identify a substance’s physical property include hard, soft, brittle, flexible, heavy, and light just to name a few.

Baking a cake may seem intimidating to most people but it really is not. All you need is a little creativity, patience and skill to master the task. It will prove not only to be fun but very therapeutic.