A bottle of Na in solution and a bottle of Cl in solution are mixed together and the water evaporated. What type of bond will be created between the atoms, and what will be the product?
A. Covalent bonds; sodium chlorine.
B. Ionic bonds; table salt.
C. Hydrogen bonds; sodium hydroxide.
D. Carbon bonds; carboxyl groups.
B. Ionic bonds; table salt.
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Today, the fossil record
A. can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated. B. can be dated reasonably well only with uranium-238. C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives. D. can be dated precisely, to within a single year, using radioactive isotopes. E. can be dated precisely, to within a single year, using DNA hybridization.
Compare the functions of meiosis I and II in the overall generation of gametes
What will be an ideal response?
Which of the following would not be found exclusively in the benthic environment?
a. coral reefs b. clams and oysters c. kelp d. eel grass e. nekton
Silicon has an atomic number of 14 and a mass number of 28. How many neutrons are found in silicon?
A. 28 B. 14 C. 42 D. 8