Grade 10 Chemistry: Percent Composition & Empirical Formulas

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60-second challenges on mass % and empirical formulas.

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sameh Ali

Saudi Arabia

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Froggy Jumps Grade 10 Chemistry: Percent Composition & Empirical FormulasVersion en ligne 60-second challenges on mass % and empirical formulas. par sameh Ali 1 A compound has 52 g C, 13 g H, and 26 g O. What is the percent composition of carbon? You have 60 seconds to answer. a 62.5% b 57.1% c 43.0% 2 A compound is 40% C, 6.7% H, and 53.3% O by mass. Its empirical formula is? You have 60 seconds to answer. a CH2O b C2H4O2 c CO2 3 A compound has empirical formula CH2O and molar mass 90 g/mol. What is its molecular formula? You have 60 seconds to answer. a C6H12O6 b C2H4O2 c C3H6O3 4 Percent composition of CO2 is approximately? You have 60 seconds to answer. a C: 40.0%, O: 60.0% b C: 27.3%, O: 72.7% c C: 60.0%, O: 40.0% 5 If a compound has 24.31 g Mg and 40.30 g O, the percent composition of Mg is? You have 60 seconds to answer. a 40.3% b 60.3% c 71.5% 6 An empirical formula from masses: 12 g C, 16 g O, 4 g H gives empirical formula? You have 60 seconds to answer. a CH2O b C2H4O2 c CH4O 7 Which of these represents a valid empirical formula from mass data? You have 60 seconds to answer. a NH b NHO2 c N2H2O 8 A compound with mass percent C 50%, H 6.7%, O 43.3%. Empirical formula is? You have 60 seconds to answer. a C2H5O b C3H6O3 c CH2O 9 Percent composition of iron oxide, Fe2O3: Fe ~70.9%, O ~29.1%. True or false? You have 60 seconds to answer. a True b False c Cannot determine

Froggy Jumps

Grade 10 Chemistry: Percent Composition & Empirical FormulasVersion en ligne

60-second challenges on mass % and empirical formulas.

par sameh Ali

A compound has 52 g C, 13 g H, and 26 g O. What is the percent composition of carbon? You have 60 seconds to answer.

62.5%

57.1%

43.0%

A compound is 40% C, 6.7% H, and 53.3% O by mass. Its empirical formula is? You have 60 seconds to answer.

CH2O

C2H4O2

CO2

A compound has empirical formula CH2O and molar mass 90 g/mol. What is its molecular formula? You have 60 seconds to answer.

C6H12O6

C2H4O2

C3H6O3

Percent composition of CO2 is approximately? You have 60 seconds to answer.

C: 40.0%, O: 60.0%

C: 27.3%, O: 72.7%

C: 60.0%, O: 40.0%

If a compound has 24.31 g Mg and 40.30 g O, the percent composition of Mg is? You have 60 seconds to answer.

40.3%

60.3%

71.5%

An empirical formula from masses: 12 g C, 16 g O, 4 g H gives empirical formula? You have 60 seconds to answer.

CH2O

C2H4O2

CH4O

Which of these represents a valid empirical formula from mass data? You have 60 seconds to answer.

NHO2

N2H2O

A compound with mass percent C 50%, H 6.7%, O 43.3%. Empirical formula is? You have 60 seconds to answer.

C2H5O

C3H6O3

CH2O

Percent composition of iron oxide, Fe2O3: Fe ~70.9%, O ~29.1%. True or false? You have 60 seconds to answer.

True

False

Cannot determine

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Grade 10 Chemistry: Percent Composition & Empirical Formulas

Froggy Jumps

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Grade 10 Chemistry: Percent Composition & Empirical FormulasVersion en ligne

par sameh Ali

A compound has 52 g C, 13 g H, and 26 g O. What is the percent composition of carbon? You have 60 seconds to answer.

A compound is 40% C, 6.7% H, and 53.3% O by mass. Its empirical formula is? You have 60 seconds to answer.

A compound has empirical formula CH2O and molar mass 90 g/mol. What is its molecular formula? You have 60 seconds to answer.

Percent composition of CO2 is approximately? You have 60 seconds to answer.

If a compound has 24.31 g Mg and 40.30 g O, the percent composition of Mg is? You have 60 seconds to answer.

An empirical formula from masses: 12 g C, 16 g O, 4 g H gives empirical formula? You have 60 seconds to answer.

Which of these represents a valid empirical formula from mass data? You have 60 seconds to answer.

A compound with mass percent C 50%, H 6.7%, O 43.3%. Empirical formula is? You have 60 seconds to answer.

Percent composition of iron oxide, Fe2O3: Fe ~70.9%, O ~29.1%. True or false? You have 60 seconds to answer.

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