Energy and Reactions Crossword Puzzle

QUESTIONS LIST:

• fuel: stores energy in a chemical store, which it can release as heat.
• physical: a change that does not form new substances, but changes the physical properties of the substance.
• reactants: substances that react together, shown before the arrow in an equation.
• products: substances formed in a chemical reaction, shown after the arrow in an equation.
• conserved: when the quantity of something does not change after a process happens.
• chemical: a change in which a new substance is formed.
• thermal decomposition: a reaction where a metal carbonate is broken down into a metal oxide and carbon dioxide.
• combustion: a reaction when a fuel burns in oxygen.
• complete: a type of combustion with a lot of oxygen present.
• incomplete: a type of combustion with a limited supply of oxygen.
• carbon dioxide: a gas that is produced after complete combustion, with the formula co2.
• carbon monoxide: a gas that is produced after incomplete combustion, with the formula co.
• metal carbonate: an example of a type of substance that can be thermally decomposed.
• metal oxide: a solid substance formed when a metal carbonate thermally decomposes.
• chemical bond: a strong force between atoms in a molecule.
• exothermic: a chemical reaction that transfers energy to the surroundings.
• endothermic: a chemical reaction that takes in energy from the surroundings.