Answer the following question given this paragraph: Empirical formulas can be determined from the percent composition of a compound. In order to determine its molecular formula, it is necessary to know the molar mass of the compound. Chemists use an instrument called a mass spectrometer to determine the molar mass of compounds. In order to go from the empirical formula to the molecular formula, follow these steps:. Q: In order to determine its molecular formula, it is necessary to know what about the compound? Choices: - lipid mass - polar mass - protons mass - molar mass A:
molar mass
(Question)
Answer the following question given this paragraph: Dermal tissue covers the outside of a plant. It's like the plant's skin. Cells of dermal tissue secrete a waxy substance called cuticle. Cuticle helps prevent water loss and damage to the plant. Q: What do cells of dermal tissue secrete? Choices: - moisture - blood - hair - cuticle A:
(Answer)
cuticle
Ques: Answer the following question given this paragraph: When water freezes in a non-crystalline, amorphous form as frost, the water molecules are fixed in place, but not in a regular, repeating pattern. Frost and other amorphous solids are characterized by their unorganized and unpredictable structure. Because ice comes in both amorphous and crystalline forms, there are differences in the physical properties of ice such as its hardness and density. Q: What kind of solid is characterized by an unorganized and unpredictable structure? Choices: - magnetic - aqueous - porous - amorphous A:
Ans: amorphous
(Q).
Answer the following question given this paragraph: An n-type (negative-type) semiconductor consists of silicon and an element such as phosphorus that gives the silicon crystal extra electrons. You can see this in the Figure above . An n-type semiconductor is like the negative terminal of a battery. Q: Silicon with an element that gives it extra electrons is which type of semiconductor? Choices: - m. Type - i.g - type - k. - type - n-type A:
(A).
n-type
Ques:Answer the following question given this paragraph: Oxidation-reduction reactions are of central importance in organic chemistry and biochemistry. The burning of fuels that provides the energy to maintain our civilization and the metabolism of foods that furnish the energy that keeps us alive both involve redox reactions. All combustion reactions are also redox reactions. A typical combustion reaction is the burning of methane, the principal component of natural gas (Figure 5.5 "The Burning of Natural Gas"). CH4 + 2O2 CO2 + 2H2O In respiration, the biochemical process by which the oxygen we inhale in air oxidizes foodstuffs to carbon dioxide and water, redox reactions provide energy to living cells. A typical respiratory reaction is the oxidation of glucose (C6H12O6), the simple sugar we encountered in the chapter-opening essay that makes up the diet of yeast: C6H12O6 + 6O2 6CO2 + 6H2O Organic chemists use a variety of redox reactions. For example, potassium dichromate (K2Cr2O7) is a common oxidizing agent that can be used to oxidize alcohols (symbolized. Q: Which common oxidizing agent can be used to oxidize alcohols? Choices: - hydrogen dichromate - potassium chloride - hydrogen chloride - potassium dichromate A:

Ans:potassium dichromate
Answer the following question given this paragraph: Algae is the focus of much research. Algae is a very promising alternative to traditional crops for biofuels. Q: Algae is a promising alternative to traditional crops for what type of fuels? Choices: - non-renewable - fertilizer - fossil - biofuel A:
biofuel