Chemistry Cumulative Questions and Answers Graded A+

1 Chemistry Cumulative Questions and Answers Graded A + Which sphere of the Earth system includes the cryosphere? Biosphere Lithosphere Atmosphere Hydrosphere ✔✔Hydrosphere For which tas k is using moles most relevant? Calculating the density of a substance. Measuring the temperature change during a reaction. Determining the number of atoms in a container of liquid. Analyzing the color change in a solution. 2 ✔✔Determining the n umber of atoms in a container of liquid. In the chemical reaction at equilibrium: H2 + I2 + heat ⇌ 2HI What happens if the temperature is increased? The equilibrium position shifts left, favoring the reactants. The equilibrium position remains unchanged. The equilibrium position shifts right, favoring the products. The reaction rate decreases. ✔✔The equilibrium position shifts right, favoring the products. 3 What distinguishes the Paleozoic era from the Mesozoic era? Increased animal complexity occurred during the Mesozoic, while flowering plants appeared in the Paleozoic. Flowering plants appeared in the Paleozoic, while animal complexity increased in the Mesozoic. The Mesozoic saw an incre ase in animal complexity, whereas the Paleozoic had the first flowering plants. Both eras experienced similar levels of animal complexity and plant development. ✔✔Increased animal complexity occurred during the Paleozoic, while flowering plants appeare d in the Mesozoic. During which era did mammals first appear? Paleozoic Cenozoic Archean Mesozoic