Q: Answer the following question given this paragraph: Figure 6.31 (a) The radius of an atom is defined as one-half the distance between the nuclei in a molecule consisting of two identical atoms joined by a covalent bond. The atomic radius for the halogens increases down the group as n increases. (b) Covalent radii of the elements are shown to scale. The general trend is that radii increase down a group and decrease across a period. Q: The radius of an atom is defined as one-half the distance between the nuclei in a molecule consisting of two identical atoms joined by what? A: | OPTIONS:
- metallic bond
- ionic bond
- hydrogen bond
- covalent bond
A: covalent bond

Q: Answer the following question given this paragraph: 16.11 Energy in Waves: Intensity 17. Two identical waves undergo pure constructive interference. Is the resultant intensity twice that of the individual waves? Explain your answer. Circular water waves decrease in amplitude as they move away from where a rock is dropped. Explain why. Q: Circular water waves decrease in what property as they move away from where a rock is dropped? A: | OPTIONS:
- voltage
- frequency
- mass
- amplitude
A: amplitude

Q: Answer the following question given this paragraph: It may be logical to assume that the electrolysis of aqueous sodium chloride, called brine , would yield the same result through the same reactions as the process in molten NaCl. However, the reduction reaction that occurs at the cathode does not produce sodium metal because the water is reduced instead. This is because the reduction potential for water is only -0.83 V compared to -2.71 V for the reduction of sodium ions. This makes the reduction of water preferable because its reduction potential is less negative. Chlorine gas is still produced at the anode, just as in the electrolysis of molten NaCl. Q: Where is chlorine gas produced? A: | OPTIONS:
- in the nucleus
- carbon cycle
- epidermis
- at the anode
A: at the anode

Q: Answer the following question given this paragraph: Living things need nonliving matter as well as energy. What do you think matter is used for? One thing is to build bodies. They also need it to carry out the processes of life. Any nonliving matter that living things need is called a nutrient . Carbon and nitrogen are examples of nutrients. Unlike energy, matter is recycled in ecosystems. You can see how in Figure below . Q: What are the nonliving matter that living things need called? A: | OPTIONS:
- fluids
- elements
- acids
- nutrients
A: nutrients