Q: What is the term for a formula that shows the elements in a compound in their lowest whole-number ratio? Read this paragraph and choose the correct option from the provided answers: An empirical formula is a formula that shows the elements in a compound in their lowest whole-number ratio. Glucose is an important simple sugar that cells use as their primary source of energy. Its molecular formula is C 6 H 12 O 6 . Since each of the subscripts is divisible by 6, the empirical formula for glucose is CH 2 O. When chemists analyze an unknown compound, often the first step is to determine its empirical formula. There are a great many compounds whose molecular and empirical formulas are the same. If the molecular formula cannot be simplified into a smaller whole-number ratio, as in the case of H 2 O or P 2 O 5 , then the empirical formula is also the molecular formula. Choices: - measured formula - intrinsic formula - Dwarf Formula - empirical formula A:
empirical formula
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Q: The scientific name of an organism consists of its genus and what else? Read this paragraph and choose the correct option from the provided answers: The scientific name of an organism consists of its genus and species. Choices: - specimens - samples - mammals - species A:
species
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Q: In mammals, what layer protects the egg? Read this paragraph and choose the correct option from the provided answers: Early Embryonic Development Fertilization is the process in which gametes (an egg and sperm) fuse to form a zygote (Figure 18.8). To ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. In mammals, a layer called the zona pellucida protects the egg. At the tip of the head of a sperm cell is a structure like a lysosome called the acrosome, which contains enzymes. When a sperm binds to the zona pellucida, a series of events, called the acrosomal reactions, take place. These reactions, involving enzymes from the acrosome, allow the sperm plasma membrane to fuse with the egg plasma membrane and permit the sperm nucleus to transfer into the ovum. The nuclear membranes of the egg and sperm break down and the two haploid nuclei fuse to form a diploid nucleus or genome. Choices: - Choloza - Germinal Disc - Albumen - zona pellucida A:
zona pellucida
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Q: When a solid substance is involved in a chemical reaction, only the matter from which part of the solid is exposed to other reactants? Read this paragraph and choose the correct option from the provided answers: When a solid substance is involved in a chemical reaction, only the matter at the surface of the solid is exposed to other reactants. If a solid has more surface area, more of it is exposed and able to react. Therefore, increasing the surface area of solid reactants increases the reaction rate. For example, crushing a solid into a powder exposes more of the substance to other reactants. This may greatly speed up the reaction. You can see another example in Figure below . Iron rusts when it combines with oxygen in the air. The iron hammer head and iron nails will both rust eventually. Which will rust faster?. Choices: - the top - the base - the interior - the surface A:
the surface
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