Chemical Reactions, Stoichiometry, and the Mole (HSC SSCE Chemistry): Quizzes

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Percentage Composition and Calculating Formulae
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What does percentage composition show?

Proportion by mass of each element

What formula calculates %A in a compound?

mass of Amolar mass×100\frac{\text{mass of A}}{\text{molar mass}}\times100

What does an empirical formula show?

Simplest whole-number atom ratio

What is the empirical formula of C2H4\text{C}_2\text{H}_4?

CH2\text{CH}_2

What is the first step to find an empirical formula?

Write down masses of all elements

If given percentages, how should you use them?

Treat as masses in 100 g of compound

After converting to moles, what is step 3?

Divide by the smallest number

Why do farmers use percentage composition?

Decide which fertiliser has most N/kg

What colour change occurs heating CuSO4⋅xH2O\text{CuSO}_4 \cdot x\text{H}_2\text{O}?

Blue to white

What is acceptable experimental error range?

Up to 10%

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Chemical Reactions, Stoichiometry, and the Mole

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Gas Laws

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Chemical Reactions, Stoichiometry, and the Mole

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Gas Laws

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Chemical Reactions, Stoichiometry, and the Mole

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Chemical Reactions, Stoichiometry, and the Mole

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Gas Laws

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