Describing Chemical Reactions – Flashcards
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Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O.
Which coefficient should he change?
answer
12
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Cecil writes the equation for the reaction of hydrogen and oxygen below.
H2 + O2 → H2O
Why does his teacher ask him to balance the equation by including the correct coefficients?
answer
to show that atoms are conserved in chemical reactions
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Which symbol in a chemical equation separates the reactants from the products?
answer
→
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The expression CaCO3 → CaO + CO2 is an example of a
answer
chemical equation.
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Rust results from iron's reaction to oxygen. An iron nail gains mass when it rusts. How does this reaction support the law of conservation of mass?
answer
The mass of the rusted nail equals the mass of iron and the oxygen from the air it reacted with to form the rust.
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Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products?
answer
45 g
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The product side of a chemical reaction is shown.
→ 7Ti2(SO4)3
Which number represents a coefficient?
answer
7
