Answer the following question given this paragraph: The electrons in the outer energy level of an atom are called valence electrons . It is valence electrons that are potentially involved in chemical reactions. The number of valence electrons determines an element's reactivity, or how likely the element is to react with other elements. The number of valence electrons also determines whether the element can conduct electric current. That's because electric current is the flow of electrons. Table below shows how these properties vary in elements from each class. Q: What are electrons in the outer energy level of an atom called? Choices: - shell electrons - outer electrons - positive electrons - valence electrons A:
valence electrons
(Question)
Answer the following question given this paragraph: Wind-blown pollen might land anywhere and be wasted. Another adaptation solved this problem. Plants evolved traits that attract specific animal pollinators . Like the bee in Figure below , a pollinator picks up pollen on its body and carries it directly to another plant of the same species. This greatly increases the chance that fertilization will occur. Q: What does a pollinator pick from its body and carry directly to another plant of the same species? Choices: - spore - pathogen - egg - pollen A:
(Answer)
pollen
Ques: Answer the following question given this paragraph: The largest known virus, called mimivirus, is so large that scientists first mistook it for a bacterium. It was first discovered in amoeba, in 1992, and was identified as a virus in 2003. Scientists believe that mimivirus may cause certain types of pneumonia in humans. The core contains DNA, with the majority of the DNA in genes, and only 10% DNA of unknown function ("junk" DNA). Q: What is the largest known virus? Choices: - polyomavirus - influenza virus - pneumonia virus - mimivirus A:
Ans: mimivirus
(Q).
Answer the following question given this paragraph: The melting point of a substance is the temperature that separates a solid and a liquid. The boiling point of a substance is the temperature that separates a liquid and a gas. What accounts for this variability? Why do some substances become liquids at very low temperatures, while others require very high temperatures before they become liquids? It all depends on the strength of the intermolecular interactions between the particles of substances. (Although ionic compounds are not composed of discrete molecules, we will still use the term intermolecular to include interactions between the ions in such compounds. ) Substances that experience strong intermolecular interactions require higher temperatures to become liquids and, finally, gases. Substances that experience weak intermolecular interactions do not need much energy (as measured by Saylor URL: http://www. saylor. org/books. Q: Melting points are temperatures that are high enough to separate liquids from which substances? Choices: - gases - seeds - oils - solids A:
(A).
solids
Ques:Answer the following question given this paragraph: Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is formed by reflected (or refracted) light. Q: What is a copy of an object that is formed by reflected light? Choices: - deflection - instance - example - image A:

Ans:image
Question: Answer the following question given this paragraph: As the temperature of a perfect crystal increases, its particles start to vibrate slightly around their optimal positions, thus increasing the entropy of the system. The dependence of entropy on temperature varies by substance, so the only temperature at which all crystals have the same entropy is absolute zero. The standard entropy of a substance is a measure of its entropy at 25C and 1 atm of pressure. Like standard enthalpy of formation values, standard entropies are tabulated for a wide range of substances. However, unlike enthalpy of formation values, all standard entropy values are positive, because the absolute zero for entropy is the most ordered possible state. Additionally, this means that pure elements in their standard states do not have a standard entropy of zero. Q: The measure of a substances entropy at 25 degrees celsius is known as it's? Choices: - specific entropy - new entropy - limited entropy - standard entropy A:
Answer:
standard entropy