Answer choices are:
A.It seldom needs refining because of its detailed accuracy.
B. It clearly depicts the particular set of characteristics being modeled.
C. It is an exact visual representation of the characteristics being modeled.
D. It is the same size and color as the scientific phenomena being demonstrated.
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Correct answer choice is:
B. It clearly depicts the particular set of characteristics being modeled.
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Explanation:
In science, a model is a depiction of an approach, an article or even a method or a scheme that is used to illustrate and interpret happenings that cannot be encountered directly. Models are fundamental to what explorers do, both in their investigation as well as when carrying their information.
Answer D. Follow Le Chatelier's principle.
Answer:
Explanation:
D. 2 Fe's, 3 O's
An atom is the smallest indivisible particle of a substance. Most notations of elements in actual sense depicts the combining atoms.
In Fe₂O₃, the subscript gives the idea of the number of combining atoms and their combining ratios. Here, weh have 2 atoms of Fe and 3 atoms of Oxygen.
Activated carbon filters use chemical means to seperate impurities from air:
Chemical reactions occurs when compounds are formed. Activated carbon filters are made up of activated carbons in which impurities have been removed and the pores of the carbon structure have become widened. This leaves the carbon with much surface area for chemical reaction to occur between impurities and the carbon in form of chemical adsorption. One important thing to note is that, in chemical change, it is difficult to resolve the reactants after the product is formed. In physical change, simple seperation techniques are used to seperate the reactants out.
Coefficients in a chemical equation express RATIOS between molecules or compounds.
In chemical equations, coefficient refers to those numerical numbers that are usually written at the front of elements' chemical symbols in order to balance the equations. Coefficients tell us the number of a particular element that must react with a specific number of another element in order for certain amount of chemical products to be produced; that is, it provide information about the reaction ratio of reactants and products. For instance, look at this chemical equation: N2 + 3H2 = 2NH3
In the equation given above, the coefficient of N2 is 1, the coefficient of H2 is 3 and the coefficient of NH3 is 2. What this equation is essentially telling us is that, in order to produce two molecules of ammonia, one molecule of nitrogen must react with three molecules of hydrogen. Thus, the equation gives the ratios between the product and the reactants.
<span>The correct answer is, Alkali Metals</span>
