Answer the following question given this paragraph: In science, a law is a mathematical relationship that exists between observations under a given set of conditions. There is a fundamental difference between observations of the physical world and explanations of the nature of the physical world. Hypotheses and theories are explanations, whereas laws and measurements are observational. Q: In science, what do we call a mathematical relationship that exists between observations under a given set of conditions? Choices: - idea - theory - fact - law A:
law
Answer the following question given this paragraph: DNA and RNA are nucleic acids. Nucleic acids are built of small units called nucleotides. Q: What are the small units that comprise nucleic acids? Choices: - genes - filaments - chromosomes - nucleotides A:
nucleotides
Q: Answer the following question given this paragraph: Samples that are the same size, but have different densities, will have different masses. Gold has a density of about 19 g/cm 3 . Pyrite has a density of only about 5 g/cm 3 . Quartz is even less dense than pyrite, and has a density of 2.7 g/cm 3 . If you picked up a piece of pyrite and a piece of quartz that were the same size, the pyrite would seem almost twice as heavy as the quartz. Q: Which highly valuable substance found in jewelry has a density of about 19 g/cm^3? Choices: - diamonds - rubies - silver - gold A:
A: gold
Question: Answer the following question given this paragraph: If particles do not have enough kinetic energy to overcome the force of attraction between them, matter exists as a solid. The particles are packed closely together and held rigidly in place. All they can do is vibrate. This explains why solids have a fixed volume and a fixed shape. Q: What state of matter exists if particles do not have enough kinetic energy to overcome the force of attraction between them? Choices: - plasma - liquid - gas - solid A:
Answer: solid
*Question*
Answer the following question given this paragraph: Varying Rates of Speciation Scientists around the world study speciation, documenting observations both of living organisms and those found in the fossil record. As their ideas take shape and as research reveals new details about how life evolves, they develop models to help explain rates of speciation. In terms of how quickly speciation occurs, two patterns are currently observed: gradual speciation model and punctuated equilibrium model. In the gradual speciation model, species diverge gradually over time in small steps. In the punctuated equilibrium model, a new species undergoes changes quickly from the parent species, and then remains largely unchanged for long periods of time afterward (Figure 18.23). This early change model is called punctuated equilibrium, because it begins with a punctuated or periodic change and then remains in balance afterward. While punctuated equilibrium suggests a faster tempo, it does not necessarily exclude gradualism. Q: Scientists around the world study speciation, documenting observations both of living organisms and those found in the fossil record. as their ideas take shape and as research reveals new details about how life evolves, they develop models to help explain what? Choices: - spontaneous mutation - creation theory - food chains - rates of speciation A:
**Answer**
rates of speciation
(Q).
Answer the following question given this paragraph: An alternative way to define the concentration of a solution is molality, abbreviated m. Molality is defined as the number of moles of solute in 1 kg of solvent. How is this different from molarity? Would you expect a 1 M solution of sucrose to be more or less concentrated than a 1 m solution of sucrose? Explain your answer. What are the advantages of using solutions for quantitative calculations?. Q: The number of moles of solute in 1 kg of solvent is defined as what? Choices: - singularity - pollenation - kilocalorie - molarity A:
(A).
molarity