The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as

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#Question id: 20113

#XL - P Chemistry

A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is (Q1 + Q2). This data

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#Question id: 20114

#XL - P Chemistry

The molar neutralization heat for and as compared to molar neutralization heat of NaOH and HCl

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#Question id: 20115

#XL - P Chemistry

If the enthalpy of B is greater than of A, the reaction A→B is

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#Question id: 20116

#XL - P Chemistry

Which of the following fuels will have the highest calorific value (kJ/kg)

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#Question id: 20117

#XL - P Chemistry

Which is the best definition of “heat of neutralization”

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#Question id: 20118

#XL - P Chemistry

Compounds with high heat of formation are less stable because