Are the following examples of chemical or physical changes?
Column A
1.
Digesting lunch:
Digesting lunch
2.
Cutting your hair:
Cutting your hair
3.
Crumbling up your snack wrapper:
Crumbling up your snack wrapper
4.
Grilling chicken:
Grilling chicken
Column B
a.Physical Changes
b.Chemical Changes
Column A:
1. Digesting lunch - Chemical Changes
2. Cutting your hair - Physical Changes
3. Crumbling up your snack wrapper - Physical Changes
4. Grilling chicken - Chemical Change
Column A:
1. Digesting lunch: This is a chemical change because the food is broken down and chemically transformed in the body during digestion.
2. Cutting your hair: This is a physical change because the hair is simply being physically altered in length or shape.
3. Crumbling up your snack wrapper: This is a physical change because the snack wrapper is being physically broken into smaller pieces without any chemical reactions occurring.
4. Grilling chicken: This is both a physical and chemical change. The physical change is the application of heat to the chicken, causing it to change color and texture. The chemical change occurs when the heat causes the proteins in the chicken to denature, resulting in a change in flavor and texture.
Column B:
1. Digesting lunch: b. Chemical Changes
2. Cutting your hair: a. Physical Changes
3. Crumbling up your snack wrapper: a. Physical Changes
4. Grilling chicken: a. Physical Changes (color and texture) and b. Chemical Changes (flavor and texture)
To determine whether the examples in Column A are examples of chemical or physical changes, we need to understand the characteristics of each type of change.
A chemical change occurs when the substances involved undergo a chemical reaction and form different substances with new properties. Physical changes, on the other hand, are changes that do not alter the chemical composition of a substance. They only affect the physical properties, such as size, shape, or state of matter.
Now let's analyze each example in Column A:
1. Digesting lunch:
Digesting lunch is a biological process that occurs in our digestive system. It involves the breakdown of food into smaller molecules by enzymes in order to extract nutrients. Since it involves breaking down food into smaller molecules, it is a chemical change.
2. Cutting your hair:
Cutting your hair does not change the chemical composition of the hair. It only affects its physical appearance, such as the length and shape. Therefore, cutting your hair is a physical change.
3. Crumbling up your snack wrapper:
Crumbling up a snack wrapper changes its physical appearance, such as its shape. It does not involve any chemical reaction or change in composition. Hence, crumbling up a snack wrapper is a physical change.
4. Grilling chicken:
Grilling chicken involves the application of heat, which causes chemical reactions to occur in the chicken. These reactions lead to changes in the structure and composition of the chicken's proteins, resulting in cooked meat with distinct flavors and textures. Therefore, grilling chicken is a chemical change.
Now, let's match each example in Column A to the corresponding type of change in Column B:
1. Digesting lunch - b. Chemical change
2. Cutting your hair - a. Physical change
3. Crumbling up your snack wrapper - a. Physical change
4. Grilling chicken - b. Chemical change