Across
- 1. An exothermic reaction is a chemical reaction that ___________ heat to its surroundings.
- 3. Crystallization happens when a dissolved substance forms a _________ with a repeating pattern of molecules or atoms.
- 7. Aluminum reacts with sodium hydroxide to produce ___________ gas and heat.
- 8. When sodium acetate crystallizes in a hand warmer, it releases heat, making it an ___________ process.
- 10. The reaction between calcium oxide and water is an example of an ___________ reaction.
- 11. Crystallization can also absorb heat, making it an ________process, as seen with ammonium chloride.
Down
- 2. Sodium carbonate reacts with calcium hydroxide to produce ___________ in the heating pack.
- 4. In an endothermic reaction, energy is ___________ from the surroundings.
- 5. In an endothermic reaction, the products have _______ energy than the reactants.
- 6. The energy needed to start a chemical reaction is called ___________ energy.
- 9. To make a supersaturated solution, first ______ the solvent to dissolve more solute than usual.