Are the following examples are chemical or physical changes?
Column A
1. Digesting lunch
2. Cutting your hair
3. Crumbling up your snack wrapper
4. Grilling chicken
Column B
A. Chemical Changes
B. Physical 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 Changes
Column A:
1. Digesting lunch: B. Physical Changes
2. Cutting your hair: B. Physical Changes
3. Crumbling up your snack wrapper: B. Physical Changes
4. Grilling chicken: A. Chemical Changes
To determine whether each example is a chemical or physical change, let's review the definitions of each type:
- Chemical Change: This refers to a process in which one or more substances are transformed into new substances with different properties. A chemical change involves the breaking and forming of chemical bonds.
- Physical Change: This refers to a process that alters the physical appearance or state of a substance without changing its chemical composition. In a physical change, no new substances are formed.
Now, let's categorize each example:
Column A:
1. Digesting lunch: This is a chemical change. During digestion, the food molecules are broken down by enzymes in the digestive system, resulting in the formation of new substances.
2. Cutting your hair: This is a physical change. Cutting hair only alters its appearance, but the chemical composition of the hair strands remains the same.
3. Crumbling up your snack wrapper: This is a physical change. Crumbling the snack wrapper changes its shape and form, but its molecules remain the same.
4. Grilling chicken: This is a chemical change. When chicken is grilled, the proteins present in the meat undergo chemical reactions through the Maillard reaction, resulting in the formation of new compounds that give the cooked chicken its distinct flavor and texture.
Column B:
A. Chemical Changes
B. Physical Changes
Therefore, the correct categorization for each example would be:
1. A
2. B
3. B
4. A