Let's go through each example step by step to verify if mass is conserved. Mass conservation means that the total mass of the reactants should equal the total mass of the products.
### Steel Wool + Oxygen Example
- Reactants:
- 6 grams of steel wool
- 1 gram of oxygen
- Total mass of reactants: \(6 \text{ grams} + 1 \text{ gram} = 7 \text{ grams}\)
- Products:
- 7 grams of iron oxide
- Conclusion: Since the total mass of the reactants (7 grams) equals the total mass of the products (7 grams), mass is conserved. Therefore, this statement is True.
### Egg + Heat Example
- Reactants:
- 1 egg (mass not specified initially, so we assume it includes the heat)
- 45 grams of heat energy
- Products:
- 41 grams of cooked egg
- 4 grams of cracked eggshells
- Total mass of products: \(41 \text{ grams} + 4 \text{ grams} = 45 \text{ grams}\)
- Conclusion: The initial mass of the egg plus the heat (46 grams) does not match the final mass of the cooked egg and eggshells (45 grams). Hence, mass is not conserved. Therefore, this statement is False.
### Water + Heat Example
- Reactants:
- 75 grams of water
- Products:
- 75 grams of steam
- Conclusion: Since the mass of the reactants (75 grams) is equal to the mass of the products (75 grams), mass is conserved. Therefore, this statement is True.
### Zinc + Hydrogen Chloride Example
- Reactants:
- 10 grams of zinc
- 5 grams of hydrogen chloride
- Total mass of reactants: \(10 \text{ grams} + 5 \text{ grams} = 15 \text{ grams}\)
- Products:
- 12 grams of zinc chloride
- 3 grams of hydrogen gas
- Total mass of products: \(12 \text{ grams} + 3 \text{ grams} = 15 \text{ grams}\)
- Conclusion: Since the total mass of the reactants (15 grams) equals the total mass of the products (15 grams), mass is conserved. Therefore, this statement is True.
### Summary
Here is the result for each example:
- Steel Wool Example: True
- Egg + Heat Example: False
- Water + Heat Example: True
- Zinc + Hydrogen Chloride Example: True
