Q: Q: Which type of weathering causes changes int he rocks materials, chemical or mechanical? Read this paragraph and choose the correct option from the provided answers: The original rock is the source of the inorganic portion of the soil. Mechanical weathering breaks rock into smaller pieces. Chemical reactions change the rock's minerals. Choices: - liquid - nuclear - mineral - chemical A:
A: chemical

Q: Q: Sounds, chemicals, and visual cues are examples of what between animals? Read this paragraph and choose the correct option from the provided answers: For individuals to cooperate, they need to communicate . Animals can communicate with sounds, chemicals, or visual cues. For example, to communicate with sounds, birds sing and frogs croak. Both may be communicating that they are good mates. Ants communicate with chemicals called pheromones . For example, they use the chemicals to mark trails to food sources so other ants can find them. Male dogs use pheromones in urine to mark their territory. They are "telling" other dogs to stay out of their yard. You can see several examples of visual communication in Figure below . Choices: - migration - circulation - procreation - communication A:
A: communication

Q: Q: Exemplified by cesium, which ignites spontaneously in air, pure elements with a high metallic character tend to be very what? Read this paragraph and choose the correct option from the provided answers: Pure elements with a high metallic character, meaning those that have chemical properties most similar to properties of metals, are generally very reactive. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Within a compound, metal atoms have a relatively low attraction to shared electrons, as indicated by their low electronegativity values. By following the trend summary in Figure below , you can see that the most reactive metals would reside in the lower left portion of the periodic table. The most reactive metal that occurs naturally in reasonable quantities is cesium, which is always found in nature as a compound, never as a free element. It reacts explosively with water and will ignite spontaneously in air. Francium is below cesium in the alkali metal group, but it is so rare that many of its properties have never even been observed. Choices: - radiactive - inactive - proactive - reactive A:
A: reactive

Q: Q: What do we call the locations where electrons are likely to be located around the nucleus? Read this paragraph and choose the correct option from the provided answers: The locations where electrons are likely to be located around the nucleus are known as orbitals. Each orbital represents a three-dimensional region in which a given electron is most likely to be found. Choices: - isotopes - cores - radials - orbitals A:
A: orbitals