Nokea
How are elements arranged in the periodic table?
- A. Order of increasing atomic number
- B. Alphabetical order
- C. Order of increasing metallic properties
- D. Order of increasing neutron content
Correct Answer: A
Rationale: In the periodic table, the elements are arranged in order of increasing atomic number. This organization is based on the number of protons in the nucleus of each element. It provides a systematic way to classify elements and predict their properties. Knowing the atomic number of an element helps determine its placement in the periodic table and its characteristics. Therefore, the correct answer is the order of increasing atomic number as it is fundamental to the structure and properties of the elements. Choices B, C, and D are incorrect. Alphabetical order does not reflect any underlying property of the elements, metallic properties vary across the table, and neutron content alone is not the basis for the arrangement in the periodic table.
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What type of starch is glycogen?
- A. Plant starch
- B. Animal starch
- C. Glucose
- D. Cellulose
Correct Answer: B
Rationale: Glycogen is classified as animal starch, not plant starch. It is the storage form of glucose in animals, primarily found in the liver and muscles. Choice A (Plant starch) is incorrect because glycogen is not derived from plants. Choice C (Glucose) is incorrect as glucose is a monosaccharide and not a type of starch. Choice D (Cellulose) is incorrect as cellulose is a structural polysaccharide found in plant cell walls, not the same as glycogen.
What are mixtures of 2 or more metals called?
- A. Solutions
- B. Alloys
- C. Compounds
- D. Suspensions
Correct Answer: B
Rationale: Alloys are mixtures of two or more metals, combining their properties to create materials with enhanced characteristics. Examples of alloys include bronze (copper and tin) and steel (iron and carbon). Alloys are commonly used in various industries due to their improved strength, durability, and other desirable qualities. Solutions (Choice A) refer to a homogeneous mixture of two or more substances, where one substance is dissolved in another. Compounds (Choice C) are substances composed of two or more elements chemically combined in fixed proportions. Suspensions (Choice D) are heterogeneous mixtures where particles are dispersed but can settle out over time.
At what temperature does water boil in °F?
- A. 210°F
- B. 212°F
- C. 215°F
- D. 220°F
Correct Answer: B
Rationale: Water boils at 212°F under standard atmospheric pressure. This is the point at which water changes from a liquid to a gas phase. Choice A (210°F) is incorrect as it is below the boiling point of water. Choice C (215°F) and Choice D (220°F) are also incorrect as they are above the boiling point of water.
What is a mathematical function that gives the amplitude of a wave as a function of position (and sometimes, as a function of time and/or electron spin)?
- A. Wavelength
- B. Frequency
- C. Wavenumber
- D. Wavefunction
Correct Answer: D
Rationale: The correct answer is D, Wavefunction. The wavefunction is a mathematical function that gives the amplitude of a wave as a function of position (and sometimes, as a function of time and/or electron spin). It is commonly used in quantum mechanics to describe the behavior of particles, particularly electrons, in atomic and molecular systems. The wavefunction provides information about the probability of finding a particle in a particular state or position. Wavelength (Choice A), Frequency (Choice B), and Wavenumber (Choice C) are properties of waves, but they do not directly represent the mathematical function that describes the wave's behavior as the wavefunction does.
Which scientific principle predicts that the solubility of a gas or volatile substance in a liquid is proportional to the partial pressure of the substance over the liquid (P = kC)?
- A. Boyle's Law
- B. Gay-Lussac's Law
- C. Henry's Law
- D. Charles' Law
Correct Answer: C
Rationale: Henry's Law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. The equation P = kC represents Henry's Law, where P is the partial pressure of the gas, C is the concentration of the gas in the liquid, and k is a constant. This law is applicable to dilute solutions where the gas does not significantly affect the liquid's volume. Therefore, in the context of gas solubility in liquids, Henry's Law is the appropriate principle that describes the relationship between solubility and partial pressure.
Boyle's Law relates the pressure and volume of a gas at constant temperature, Gay-Lussac's Law deals with the pressure and temperature relationship of a gas at constant volume, and Charles' Law describes the relationship between the volume and temperature of a gas at constant pressure. These laws are not directly related to the solubility of gases in liquids, making them incorrect choices for this question.