Chapter 1, Problem 1.17E

How do molecules of elements and molecules of compounds differ? In what ways are they similar?

Write a brief description of the relationships among each of the following groups of terms or phrases. Answers to the Concept-Linking Exercises are given at the end of the chapter. Physical property, physical change, chemical property, chemical change

What did Einstein mean when he said, The most incomprehensible thing about the world is that it is comprehensible?

The photograph below shows a beaker of water and a sugar cube, the combined mass of which is balanced by the weights on the right pan. The sugar cube is then placed in the water, and it dissolves completely. Do weights need to be added to or taken away from the right pan to keep the system in balance? Explain.

aIs the process of boiling water exothermic or endothermic with respect to the water? bA charged object is moved closer to another object that has the same charge. The energy of the system changes. Is it a change in kinetic energy or potential energy? Is the energy changes an increase or a decrease?

The freshly polished brass cylinder in the picture below is a mixture of copper and zinc. Is the cylinder a homogenous or heterogeneous substance?

The boiling of water is a physical change because the water disappears. physical change because the gaseous water is chemically the same as the liquid. chemical change because heat is needed for the process to occur. chemical change because hydrogen and oxygen gases are formed from water. chemical and physical change. Explain your answer.

Write a brief description of the relationships among each of the following groups of terms or phrases. Answers to the Concept-Linking Exercises are given at the end of the chapter. Homogeneous, heterogeneous, pure substance, mixture

Questions 47 and 48: Samples of matter may be classified in several ways, including gas, liquid, or solid G, L, S; pure substance or mixture P, M; homogenous or heterogeneous Hom, Het; and, for pure substances, element or compound E, C. For each substance in the left column of the tables shown, place in the other columns the symbol from the top of the column that best describes the substance in its most common state at room temperature and pressure. Assume that the material is clean and uncontaminated. The first box is filled in as an example. G, L, S P, M Hom, Het E, C Factory smokestack emissions All, but mostly G Concrete in a sidewalk Helium Hummingbird feeder solution Table salt