Questions and Answers
What is the general equation for the reaction of a metal with an acid?
Metal + Acid → Salt + Hydrogen gas
Based on the provided reactions, what is the product formed when Na reacts with HCl(aq)?
NaCl + H2
What compound is formed when passing carbon dioxide gas through lime water (Ca(OH)2)?
CaCO3 (s)
In the reaction between NaOH(aq) and Zn(s), which product is NOT formed?
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When adding dilute hydrochloric acid or sulfuric acid to zinc granules, what change in temperature might be observed?
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What should be observed when adding potassium iodide solution to lead nitrate solution?
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What is the simplest way to represent a chemical reaction in a shorter form?
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In a word-equation, where are the reactants typically written?
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What does a plus sign (+) between substances in a chemical equation indicate?
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How can you determine if a chemical equation is balanced?
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What principle does balancing a chemical equation adhere to?
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Which equation is considered a skeletal chemical equation for the burning of magnesium in air?
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Study Notes
Chemical Reactions and Equations
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Metal reacts with an acid to displace hydrogen atoms, forming a salt and releasing hydrogen gas, represented as: Acid + Metal → Salt + Hydrogen gas
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Examples of reactions:
- Test tube A: NaCO3 + HCl(aq) → NaCl(aq) + H2O(l) + CO2(g)
- Test tube B: NaHCO3 + HCl(aq) → NaCl(aq) + H2O(l) + CO2(g)
- Passing CO2 gas through lime water: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
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Reaction of zinc with sodium hydroxide: 2NaOH(aq) + Zn(s) → Na2ZnO2(s) + H2(g)
Chemical Equations
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A chemical equation represents a chemical reaction, with reactants on the left and products on the right, separated by an arrow.
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Word-equation: Magnesium + Oxygen → Magnesium oxide
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Chemical equation: Mg + O2 → MgO
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A chemical equation can be balanced or unbalanced.
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The law of conservation of mass states that the total mass of elements in the products is equal to the total mass of elements in the reactants.
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Balancing a chemical equation involves ensuring that the number of atoms of each element is the same on both sides of the equation.
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Description
Learn about the reactions of metals with acids and how they displace hydrogen atoms to form salts and hydrogen gas. Practice writing chemical equations based on observed reactions.
