Q: What is another name for a radioactive isotope? Read this paragraph and choose the correct option from the provided answers: A radioactive isotope, or radioisotope, has atoms with unstable nuclei. The unstable nuclei naturally decay, or break down, by losing energy and particles of matter to become more stable. If they gain or lose protons as they decay, they become different elements. Over time, as the nuclei continue to decay, less and less of the original radioisotope remains. Choices: - nono particle - kilocalorie - xerophyte - radiostope A:
radiostope

Q: What is usually the prey of a protist? Read this paragraph and choose the correct option from the provided answers: The protist wraps around its prey, which is usually bacteria. Choices: - pathogens - algae - proteins - bacteria A:
bacteria

Q: Even though tellurium does indeed have a greater average atomic mass than iodine, it is properly placed before iodine in the? Read this paragraph and choose the correct option from the provided answers: When ordered by atomic number, the discrepancies within Mendeleev's table disappeared. Tellurium has an atomic number of 52, while iodine has an atomic number of 53. Even though tellurium does indeed have a greater average atomic mass than iodine, it is properly placed before iodine in the periodic table. Mendeleev and Moseley are credited with formulating the modern periodic law , which states that when elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties. We will discuss some of these chemical and physical properties later on in this chapter. The result is the periodic table as we know it today. Choices: - theory table - phases table - cycles table - periodic table A:
periodic table

Q: Physical or chemical changes are generally accompanied by a transfer of what? Read this paragraph and choose the correct option from the provided answers: When physical or chemical changes occur, they are generally accompanied by a transfer of energy. The law of conservation of energy states that in any physical or chemical process, energy is neither created nor destroyed. In other words, the entire energy in the universe is conserved. In order to better understand the energy changes taking place during a reaction, we need to define two parts of the universe, called the system and the surroundings. The system is the specific portion of matter in a given space that is being studied during an experiment or an observation. The surroundings is everything in the universe that is not part of the system. In practical terms for a laboratory chemist, the system is the particular chemicals being reacted, while the surroundings is the immediate vicinity within the room. During most processes, energy is exchanged between the system and the surroundings. If the system loses a certain amount of energy, that same amount of energy is gained by the surroundings. If the system gains a certain amount of energy, that energy is supplied by the surroundings. Choices: - shape - pressure - color - energy A:
energy