During a chemical change, at least one new substance is formed. This is the defining characteristic of a chemical reaction. While other observations like light being emitted, heat being released, or a change in color may occur during a chemical change, they are not universally present.

1. **Formation of New Substances**: This is the key aspect that defines a chemical change. In a chemical reaction, reactants undergo a transformation to form products with different chemical properties.

2. **Additional Observations**:
- **Light Release**: Some reactions, like combustion, release light; however, not all do.
- **Heat Release**: Exothermic reactions release heat, but endothermic reactions absorb heat instead.
- **Color Change**: A change in color may indicate a chemical change, but it's not always definitive.

In summary, the formation of at least one new substance is the characteristic that must always occur during a chemical change. The other observations may occur but are not necessary for every chemical reaction.

Question

During a chemical change, at least one new substance is formed. This is the defining characteristic of a chemical reaction. While other observations like light being emitted, heat being released, or a change in color may occur during a chemical change, they are not universally present.

1. **Formation of New Substances**: This is the key aspect that defines a chemical change. In a chemical reaction, reactants undergo a transformation to form products with different chemical properties.

2. **Additional Observations**:
   - **Light Release**: Some reactions, like combustion, release light; however, not all do.
   - **Heat Release**: Exothermic reactions release heat, but endothermic reactions absorb heat instead.
   - **Color Change**: A change in color may indicate a chemical change, but it's not always definitive.

In summary, the formation of at least one new substance is the characteristic that must always occur during a chemical change. The other observations may occur but are not necessary for every chemical reaction.

Knowee AI · Accepted Answer

During a chemical change, at least one new substance is formed. This is the defining characteristic of a chemical reaction. While other observations like light being emitted, heat being released, or a change in color may occur during a chemical change, they are not universally present.

1. **Formation of New Substances**: This is the key aspect that defines a chemical change. In a chemical reaction, reactants undergo a transformation to form products with different chemical properties.

2. **Additional Observations**:
   - **Light Release**: Some reactions, like combustion, release light; however, not all do.
   - **Heat Release**: Exothermic reactions release heat, but endothermic reactions absorb heat instead.
   - **Color Change**: A change in color may indicate a chemical change, but it's not always definitive.

In summary, the formation of at least one new substance is the characteristic that must always occur during a chemical change. The other observations may occur but are not necessary for every chemical reaction.

what must always happen during a chemical change.Light is releasedHeat is releasedThe colour changesAt least one new substance is formed

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What must always happen during a chemical change?

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