Chemistry Essentials Quiz

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Key concepts in thermo/atomic chemistry

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Laila Mims

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Chemistry Essentials Quiz


Chemistry Essentials QuizVersión en línea Key concepts in thermo/atomic chemistry por Laila Mims 1 What does Hess's Law state about enthalpy changes in reactions? a Enthalpy changes cancel out for all steps. b Enthalpy is only defined for liquids. c Enthalpy cannot be used to compare different pathways. d The total enthalpy change is the sum of the enthalpy changes of individual steps. 2 In calorimetry, what is the relationship between heat gain and heat loss? a Heat gained equals heat gained by the system. b Heat gained by the surroundings equals heat lost by the system. c Heat gained by the system equals heat gained by surroundings. d Heat lost by surroundings equals heat gained by the system. 3 What is the specific heat capacity? a The energy released when a substance burns. b The energy to change a substance from solid to gas. c The heat capacity per mole of a substance. d The amount of energy required to raise 1 g of a substance by 1 °C. 4 What is standard enthalpy of formation? a Enthalpy change for any reaction at standard conditions. b Enthalpy change to decompose a compound to elements. c Enthalpy change measured at 0 K. d Enthalpy change when 1 mole of a compound forms from its elements in their standard states. 5 Which statement describes an endothermic reaction? a It absorbs heat from its surroundings. b It occurs without any change in temperature. c Its enthalpy change is always negative. d It releases heat to its surroundings. 6 Which equation expresses the Planck relation for a photon? a E = hv b E = kT c E = m c^2 d E = p^2/2m 7 What is the relationship between wavelength and frequency in electromagnetic waves? a Wavelength increases with frequency b Frequency is independent of wavelength c Wavelength and frequency are inversely related (c = λν). d They are directly proportional 8 True or false: No two elements have the same emission spectrum. a True b Only for isotopes of the same element c False d Sometimes true 9 What is the standard enthalpy of combustion used for? a Energy released when a solution forms. b Energy required to melt a solid. c Energy change when a substance combusts in oxygen. d Energy change when a substance forms from elements. 10 In a calorimetry problem, if a 360.0 g rebar at unknown temperature is placed in 425 g water at 24.0 °C and final water is 42.7 °C, what principle is used to find the rebar's initial temperature? a Heat lost by rebar equals heat gained by water (q_rebar = -q_water). b Heat lost by water equals heat gained by rebar. c Heat gained by rebar equals heat gained by water. d Energy is conserved but not via heat transfer. Feedback 1 false 2 false 3 false 4 false 5 false 6 false 7 false 8 false 9 false 10 false

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Chemistry Essentials Quiz

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Creada por

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Chemistry Essentials QuizVersión en línea

por Laila Mims

What does Hess's Law state about enthalpy changes in reactions?

In calorimetry, what is the relationship between heat gain and heat loss?

What is the specific heat capacity?

What is standard enthalpy of formation?

Which statement describes an endothermic reaction?

Which equation expresses the Planck relation for a photon?

What is the relationship between wavelength and frequency in electromagnetic waves?

True or false: No two elements have the same emission spectrum.

What is the standard enthalpy of combustion used for?

In a calorimetry problem, if a 360.0 g rebar at unknown temperature is placed in 425 g water at 24.0 °C and final water is 42.7 °C, what principle is used to find the rebar's initial temperature?

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