Let’s go through each statement one by one to decide if it’s TRUE or FALSE.
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Statement 1: “When the coal was burned, the carbon was destroyed.”
→ FALSE.
The worksheet says: “atoms are rearranged but not destroyed.” When coal (carbon) burns, it combines with oxygen to make carbon dioxide — the carbon atoms still exist, just in a different form. So, nothing is destroyed.
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Statement 2: “Atoms are not destroyed, but bond with other molecules to form new substances.”
→ TRUE.
This matches exactly what the worksheet teaches: atoms rearrange to make new things, but they don’t disappear. For example, carbon + oxygen → carbon dioxide. The atoms are still there — just bonded differently.
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Statement 3: “The conservation of mass only applies to solids.”
→ FALSE.
Conservation of mass applies to ALL states of matter — solids, liquids, and gases. In the example, carbon (solid) + oxygen (gas) → carbon dioxide (gas). The total mass stays the same even though gases are involved.
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Statement 4: “The number of atoms always remains the same.”
→ TRUE.
This is the heart of conservation of mass. Atoms aren’t created or destroyed in chemical reactions — they just get rearranged. So, if you start with 10 atoms, you’ll end with 10 atoms — maybe in different combinations.
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Final Answer:
FALSE, TRUE, FALSE, TRUE
Parent Tip: Review the logic above to help your child master the concept of law of conservation of mass worksheet.
