Answer the following question given this paragraph: A compound has different properties than the substances it contains. For example, hydrogen and oxygen are gases at room temperature. But when they combine chemically, they form liquid water. Another example is table salt, or sodium chloride. It contains sodium and chlorine. Sodium is a silvery solid that reacts explosively with water, and chlorine is a poisonous gas (see Figure below ). But together, sodium and chlorine form a harmless, unreactive compound that you can safely sprinkle on food. Q: In what form of matter is hydrogen at room temperature? Choices: - dissolved - liquid - solid - gas A:
gas
(Question)
Answer the following question given this paragraph: Catalysts may be classified as either homogeneous or heterogeneous. A homogeneous catalyst is uniformly dispersed throughout the reactant mixture to form a solution. Sulfuric acid, for example, is a homogeneous catalyst used in the synthesis of esters such as procaine (Example 13). An ester has a structure similar to that of a carboxylic acid, in which the hydrogen atom attached to oxygen has been replaced by an R group. They are responsible for the fragrances of many fruits, flowers, and perfumes. Other examples of homogeneous catalysts are the enzymes that allow our bodies to function. In contrast, a heterogeneous catalyst is in a different physical state than the reactants. For economic reasons, most industrial processes use heterogeneous catalysts in the form of solids that are added to solutions of the reactants. Because such catalysts often contain expensive precious metals such as platinum or palladium, it makes sense to formulate them as solids that can be easily separated from the liquid or gaseous reactantproduct mixture and recovered. Examples of heterogeneous catalysts are the iron oxides used in the industrial synthesis of ammonia and the catalytic converters found in virtually all modern automobiles, which contain precious metals like palladium and rhodium. Catalysis will be discussed in more detail in Chapter 14 "Chemical Kinetics" when we discuss reaction rates, but you will encounter the term frequently throughout the text. Q: What two ways may catalyst be classified? Choices: - oxygenated or heterogenous - reactive or nonreactive - fast or slow - homogeneous or heterogeneous A:
(Answer)
homogeneous or heterogeneous
Ques: Answer the following question given this paragraph: Ethanol and resveratrol, a phenol, are representatives of two of the families of oxygencontaining compounds that we consider in this chapter. Two other classes, aldehydes and ketones, are formed by the oxidation of alcohols. Ethers, another class, are made by the dehydration of alcohols. Q: What class of oxygencontaining compounds is formed by the dehydration of alcohols? Choices: - reagents - sugars - nethers - ethers A:
Ans: ethers
(Q).
Answer the following question given this paragraph: 24.5 Metabolic States of the Body There are three main metabolic states of the body: absorptive (fed), postabsorptive (fasting), and starvation. During any given day, your metabolism switches between absorptive and postabsorptive states. Starvation states happen very rarely in generally well-nourished individuals. When the body is fed, glucose, fats, and proteins are absorbed across the intestinal membrane and enter the bloodstream and lymphatic system to be used immediately for fuel. Any excess is stored for later fasting stages. As blood glucose levels rise, the pancreas releases insulin to stimulate the uptake of glucose by hepatocytes in the liver, muscle cells/fibers, and adipocytes (fat cells), and to promote its conversion to glycogen. As the postabsorptive state begins, glucose levels drop, and there is a corresponding drop in insulin levels. Falling glucose levels trigger the pancreas to release glucagon to turn off glycogen synthesis in the liver and stimulate its breakdown into glucose. The glucose is released into the bloodstream to serve as a fuel source for cells throughout the body. If glycogen stores are depleted during fasting, alternative sources, including fatty acids and proteins, can be metabolized and used as fuel. When the body once again enters the absorptive state after fasting, fats and proteins are digested and used to replenish fat. Q: As blood glucose levels rise what is released from the pancreas? Choices: - adrenaline - estrogen - hemoglobin - insulin A:
(A).
insulin
Ques:Answer the following question given this paragraph: Some mutations have a positive effect on the organism in which they occur. They are called beneficial mutations. They lead to new versions of proteins that help organisms adapt to changes in their environment. Beneficial mutations are essential for evolution to occur. They increase an organism's changes of surviving or reproducing, so they are likely to become more common over time. There are several well-known examples of beneficial mutations. Here are just two:. Q: Some mutations lead to new versions of proteins that help organisms adapt to changes in their environment and are essential for evolution to occur. what are these mutations known as? Choices: - superficial mutations - evolutionary mutations - provisional mutations - beneficial mutations A:

Ans:beneficial mutations
Question: Answer the following question given this paragraph: Science is a way of learning about the natural world that is based on evidence and logic. Q: What subject is a way of learning about the natural world that is based on evidence and logic? Choices: - evolution - geography - geology - science A:
Answer:
science