Across
- 3. We use the energy from _______ fuels to run cars and buses, heat homes, and cook food.
- 7. This led to the Law of Conservation of Matter: matter cannot be created or ___________ during chemical reactions.
- 8. Antoine Lavoisier discovered that the ______ of reactants and products in a chemical reaction is always the same.
- 9. Fuels are substances that release _______ when they burn.
- 10. ___________ fuel produces only water when burned, making it less harmful to Earth’s climate than carbon-containing fuels.
- 11. When gasoline burns, the atoms form invisible gases like _____________________ and water, which is why the liquid seems to disappear.
- 12. When we burn something—whether it is a log, a match, or gasoline—we are causing a __________________.
Down
- 1. Atoms rearrange into new groups during chemical reactions, but the atoms themselves never ___________ or appear out of nowhere.
- 2. Burning carbon-containing fuels has increased carbon dioxide in Earth’s atmosphere, causing ____________________.
- 4. Chemical reactions cause substances to change into other substances as the atoms of the reactants _______________ to form the products.
- 5. On Tuesday, Mr. Scott got to spend all day with __________.
- 6. On Tuesday night (early Wednesday morning), Mr. Scott made enemies with a _____.