Q: Q: What is the number of protons in the nucleus? Read this paragraph and choose the correct option from the provided answers: At least by our current understanding, a given atom can be defined by its atomic number and its mass number. The atomic number is the number of protons in the nucleus. All atoms with a given atomic number are the same element, because the chemical properties of an atom are primarily determined by the number of positive charges in its nucleus (and therefore the number of negatively charged electrons needed to make it neutral). The mass number of an atom is equal to the number of protons plus the number of neutrons. Since these particles both have a mass of approximately 1 amu and electrons are much smaller, the mass number is approximately equal to the mass of the atom in units of amu. Choices: - element - metallic number - atomic mass - atomic number A:
A: atomic number

Q: Q: What has a pseudocoelom and hydrostatic skeleton? Read this paragraph and choose the correct option from the provided answers: Roundworms make up the phylum Nematoda. They have a pseudocoelom and hydrostatic skeleton. Their body is covered with tough cuticle. Free-living roundworms are found mainly in freshwater habitats. Parasitic roundworms have a variety of hosts, including humans. Choices: - vertebrates - omnivores - gymnosperms - roundworms A:
A: roundworms

Q: Q: What is the process that moves particles by rolling or dragging along the bottom of the water? Read this paragraph and choose the correct option from the provided answers: The biggest particles, including gravel and pebbles, are moved by traction . In this process, the particles roll or drag along the bottom of the water. Choices: - compaction - compression - isolation - traction A:
A: traction

Q: Q: Boyle's law applies to matter which is in what state? Read this paragraph and choose the correct option from the provided answers: A piston having a certain pressure and volume (left piston) will have half the volume when its pressure is twice as much (right piston). One can also plot P versus V for a given amount of gas at a certain temperature; such a plot will look like the graph on the right. Boyle's law is an example of a second type of mathematical problem we see in chemistryone based on a mathematical formula. Tactics for working with mathematical formulas are different from tactics for working with conversion factors. First, most of the questions you will have to answer using formulas are word-type questions, so the first step is to identify what quantities are known and assign them to variables. Second, in most formulas, some mathematical rearrangements (i. , algebra) must be performed to solve for an unknown variable. The rule is that to find the value of the unknown variable, you must mathematically isolate the unknown variable by itself and in the numerator of one side of the equation. Finally, units must be consistent. For example, in Boyle's law there are two pressure variables; they must have the same unit. There are also two volume variables; they also must have the same unit. In most cases, it won't matter what the unit is, but the unit must be the same on both sides of the equation. Choices: - liquids - plasma - solids - gas A:
A: gas