Are the following examples of chemical or physical changes?
Column A
1.
rusting metal:
rusting metal
2.
slicing bread:
slicing bread
3.
corroding battery:
corroding battery
4.
boiling water:
boiling water
Column B
a.physical change
b.chemical change
Column A
1. rusting metal: b. chemical change
2. slicing bread: a. physical change
3. corroding battery: b. chemical change
4. boiling water: a. physical change
Column A
1. rusting metal: b. chemical change
2. slicing bread: a. physical change
3. corroding battery: b. chemical change
4. boiling water: a. physical change
To determine whether the examples in Column A are chemical or physical changes, we need to understand the difference between the two.
A physical change is a change in the appearance or form of a substance without altering its chemical composition. In other words, the substance remains the same at the molecular level, even though its physical properties may change.
On the other hand, a chemical change (also known as a chemical reaction) is a process that involves the breaking and forming of chemical bonds, resulting in the creation of new substances with different chemical properties.
Now, let's analyze each example using this information:
1. Rusting metal - Rusting is a chemical change. When iron reacts with oxygen in the presence of moisture, it forms rust (iron oxide), which is a new substance with different chemical properties.
2. Slicing bread - Slicing bread is a physical change. It alters the shape and appearance of the bread but does not change its chemical composition.
3. Corroding battery - Corroding a battery is a chemical change. It involves a chemical reaction between the battery's components and the surrounding environment, leading to the formation of new substances.
4. Boiling water - Boiling water is a physical change. It changes the state of water from a liquid to a gas (water vapor) but does not change its chemical composition.
Now that we have determined whether each example is a chemical or physical change, let's match them with the corresponding categories in Column B:
1. Rusting metal - b. chemical change
2. Slicing bread - a. physical change
3. Corroding battery - b. chemical change
4. Boiling water - a. physical change