This lesson we will be learning about PS2 B Types of interactions, PS2 C Stability and instability in physical systems, PS1 B Chemical reactions.
In class we will be testing different items to see if they sink of float. We will be making oobleck (a non-newtonian fluid) and also experimenting with chemical reactions.
What is a chemical reaction? Think about baking a cake. Each ingredient has a job to do. Flour provides the structure; baking powder and baking soda give the cake its airiness; eggs bind the ingredients; butter and oil tenderize; sugar sweetens; and milk or water provides moisture.
Combining the dry and wet ingredients puts them to work — the proteins in the flour bond and create gluten, giving the cake its flexibility. Eggs hold the mixture together. Baking powder and baking soda each release carbon dioxide, adding bubbles to the batter, helping it expand (Chemical reaction). Baking is a science!
Physical changes result from a changing in the physical state of a substance. The physical change can be melting, evaporation, or boiling. For instance, ice melts into liquid water, and the liquid water can be turned into steam through boiling. The arrangement of the molecules making up the ice and water change into different states, but the molecules still remain water molecules during each change.
A chemical change occurs as the result of a chemical reaction. During a chemical reaction, the atoms within a substance are rearranged into different combinations. For example, sugar undergoes a chemical change when it is cooked to make caramel. The heat from the cooking converts sugar molecules into different molecules that give caramel its color and flavor.
Several general types of chemical reactions can occur based on what happens when going from reactants to products. The more common types of chemical reactions are as follows: