Word equations for reactions: A way of representing chemical reactions using words instead of symbols, showing the reactants and products involved (see source for example: zinc + sulfuric acid → zinc sulfate + hydrogen).
Reactants and products: Reactants are substances that undergo a chemical change, written on the left side of the word equation; products are substances formed as a result of the reaction, written on the right side.
Common reaction pattern: metal + acid → salt + hydrogen: A typical chemical reaction where a metal reacts with an acid to produce a salt and hydrogen gas, exemplified by zinc + hydrochloric acid → zinc chloride + hydrogen.
Word equations are used to describe reactions clearly, emphasizing the roles of reactants and products without chemical symbols.
Reactants are always written on the left side of the equation, and products on the right, with the arrow indicating "produces" or "yields."
1. What is a chemical reaction?
2. Who formulated the law of conservation of mass in 1789?
3. What is the primary role of the law of conservation of mass in chemical reactions?
Chemical reactions — definition?
Processes where substances change into new substances.
Reactants — role?
Substances that undergo a chemical change.
Products — role?
Substances formed after a reaction.
Metal + acid — pattern?
Produces salt and hydrogen gas.
Physical change — example?
Melting ice or crushing chalk.
Chemical change — example?
Burning wood or rusting iron.
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