Question

Answer the following questions to determine your understanding of chemical and physical changes in a blank change. The chemical bonds between atoms are broken and rearrange to form new substances is that physical or chemical changes next a blank changes is a change in the appearance or state of a substance without any change in its chemical composition is that physical or chemical Changes when iron rust it undergoes a blank change because new substances are formed is that physical or chemical change next when I smelts it undergoes a blank changes because it state changes from solid to liquid is that physical or chemical and the bowling of water is an example of a blank change because the state of the water changes from liquid to gas. Is that a chemical or physical change Cooking an egg is an example of a blank change. Would that be physical or chemical change? Which one is the answer?

Answer 1

Let's fill in the blanks with the appropriate terms—chemical change or physical change:

1. The statement "The chemical bonds between atoms are broken and rearranged to form new substances" describes a **chemical change**.

2. The statement "A change in the appearance or state of a substance without any change in its chemical composition" describes a **physical change**.

3. When iron rusts, it undergoes a **chemical change** because new substances (iron oxide) are formed.

4. When iron is smelted, it undergoes a **physical change** because its state changes from solid to liquid.

5. The boiling of water is an example of a **physical change** because the state of the water changes from liquid to gas.

6. Cooking an egg is an example of a **chemical change** because the proteins in the egg undergo a chemical transformation that creates new substances.

So the answers in order are: chemical change, physical change, chemical change, physical change, physical change, chemical change.