Chemistry Essentials Quiz

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Core topics recap

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Owen Blankenfeld

United States

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Chemistry Essentials Quiz


Chemistry Essentials QuizVersion en ligne Core topics recap par Owen Blankenfeld 1 How many significant figures are in 0.02050 g? a 3 significant figures b 2 significant figures c 4 significant figures d 5 significant figures 2 How many significant figures are in 120 mL? a 3 significant figures b 1 significant figure c 4 significant figures d 2 significant figures 3 What conversion factor is used to convert 0.750 liters to milliliters? a 100 mL / 1 L b 1 L / 1000 mL c 1000 mL / 1 L d 10 mL / 1 L 4 Why is density considered an intensive property? a Because it is a weight measure b Because it does not change based on the amount of matter present c Because it changes with volume d Because it depends on mass only 5 A student measures 25.0 mL, 25.1 mL, and 24.9 mL. The true value is 30.0 mL. Are the measurements accurate and/or precise? a Accurate but not precise b Precise but not accurate c Neither accurate nor precise d Both accurate and precise 6 What is (2.50 × 10^2) × (4.00 × 10^-5)? a 1.00 × 10^1 b 1.00 × 10^2 c 1.00 × 10^0 d 1.00 × 10^-2 7 A student calculates copper’s density as 8.42 g/cm^3. The accepted value is 8.96 g/cm^3. What is the percent error? a 3.2% b 11.6% c 6.03% d -6.03% 8 An object has mass 26.5 g and displaces water from 15.0 mL to 21.0 mL. What is its density? a 1.75 g/mL b 0.43 g/mL c 21.0 g/mL d 4.4 g/mL 9 According to the Law of Conservation of Mass, if 24.3 g Mg reacts with 16.0 g O, what is mass of MgO produced? a 60.3 g b 24.3 g c 10.3 g d 40.3 g Feedback 1 Significant figures are the digits that carry meaning in a measurement; trailing zeros after decimal are significant. 2 Without a decimal point, trailing zeros may not indicate precision. 3 There are 1000 mL in 1 L. 4 Intensive properties do not depend on sample size. 5 Values are close to each other (precise) but far from the true value (not accurate). 6 Multiply coefficients: 2.50×4.00=10.00; powers add to 2-5 = -3; result 1.00×10^-2. 7 Percent error = \|experimental - accepted\| / accepted × 100%. 8 Density = mass / volume; volume = 21.0-15.0 = 6.0 mL. 9 Mass is conserved in chemical reactions.

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Chemistry Essentials Quiz

Test

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

Top Jeux

Test

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Test

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Practice Quiz - Punnett Square, Variation, and Mutations

Chemistry Essentials QuizVersion en ligne

par Owen Blankenfeld

How many significant figures are in 0.02050 g?

How many significant figures are in 120 mL?

What conversion factor is used to convert 0.750 liters to milliliters?

Why is density considered an intensive property?

A student measures 25.0 mL, 25.1 mL, and 24.9 mL. The true value is 30.0 mL. Are the measurements accurate and/or precise?

What is (2.50 × 10^2) × (4.00 × 10^-5)?

A student calculates copper’s density as 8.42 g/cm^3. The accepted value is 8.96 g/cm^3. What is the percent error?

An object has mass 26.5 g and displaces water from 15.0 mL to 21.0 mL. What is its density?

According to the Law of Conservation of Mass, if 24.3 g Mg reacts with 16.0 g O, what is mass of MgO produced?

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