Using the specific heats of the rock and the water, Lydia calculates that the final temperature of the water and the rock will be 28°C. After she lets the rock sit in the water for 15 minutes, the
temperature of the water and the rock are both 26°C. Which statement BEST describes why
Lydia's calculation and the temperature of the water and rock after 15 minutes are not the same?
of
ch
A
Some of the thermal energy was absorbed from the surroundings.
В.
More thermal energy was absorbed by the water than expected
C.
Some of the thermal energy was transferred to the surroundings
D
More thermal energy was absorbed by the rock than expected.
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7.

Consider the point on the plot where 10.0 g of naoh have been added. what amount of naoh, in moles, has been added? 0.308 mol fecl3 initially present

Mrs. smith ordered a root beer float (vanilla ice cream + root beer). mrs. smith noticed that the three states of matter (solid, liquid, and gas) all existed simultaneously in her root beer float. a. identify each phase of matter in the root beer float. b. describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? ) c. identify one phase change you would see in a root beer float and described what causes this change.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.