Chemistry Questions

When wood is burned, energy is released in the forms of heat and light. Describe the reaction, and explain why this change does not violate the law of conservation of energy. Use the terms combustion, exothermic, and chemical energy.
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Suppose the plates beneath Earth's surface stopped moving.What do you think would happen?Explain your answer.
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What would happen to temperatures on earth the suns heat were distributed throughout the atmosphere
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Which element has atoms with the strongest attraction for electrons in a chemical bond?chlorinenitrogenfluorine oxygen
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What is a group of electrons orbiting at roughly the same distance from the nucleus
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The development of nuclear power has provided electricity for less money, but at a cost. What may be considered a "cost" of nuclear power? A. Large amounts of energy are produced very cheaply. B.It takes a lot of energy to run a nuclear power plant. C.Nuclear power plants provide new jobs for a community. D.The radioactive waste is unsafe and hard to store safely.
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Why is cellulose so difficult for most animals to digest? A)           they don’t have the proper enzyme to break the bonds between subunits                 B)            cellulose is made up of chitin, which is indigestible                 C)            the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule                 D)           there are many hydrogen bonds holding the subunits together
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FILL IN THE BLANK. HELPPPP!Weak bases react with _______ to form the hydroxide ion and the conjugate _______ of the base. Concentration in solution does not affect whether an acid or a base is _______ or weak.The strength of an acid or a base is determined by the _______ of the substance in solution. The acid dissociation constant, _______, is a quantitative measure of acid strength. A strong acid has a much _______ Ka than a weak acid. The Ka of an acid is determined from measured _______ values.Hydrochloric acid and sulfuric acid are _______ ionized in solution and are _______ acids. Ethanoic acid, which is only about 1 percent ionized, is a _______ acid. Magnesium hydroxide and calcium hydroxide are strong _______.
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a hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion? Explain your answer.
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Which organism is an herbivore?A.grassB.bacteriumC.spiderD.grasshopper
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Methane reacts with oxygen to produce carbon dioxide and water. What are the products? A.methane and waterB.oxygen and carbon dioxideC.methane and oxygenD.carbon dioxide and wate
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Examine the graph below.Choose which of the following is NOT true.Absolute zero on Kelvin scale is -273°C.Liquefaction of the gas occurs at approximately -155°C.Condensation occurs at 0°C.The gas follows a linear relationship between volume and temperature.
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This is the equation for the combustion of propane.C3H8 + 5O2 → 3CO2 + 4H2O + heatWhich are the reactants and the products in this reaction?A.The reactants are C3H8 (propane) and H2O (water). The products are O2 (oxygen) and CO2 (carbon dioxide).B.The reactants are C3H8 (propane) and O2 ( oxygen). The products are CO2 (carbon dioxide) and H2O (water).C.The reactants are CO2 (carbon dioxide) and H2O (water). The products are C3H8 (propane) and O2 ( oxygen).D.The reactants are O2 (oxygen) and CO2 (carbon dioxide). The products are C3H8 (propane) and H2O (water).
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An experiment requires 40.0g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
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What happens at a hot spot?
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Write the symbols for the following isotopes: Its atoms contain 50 electrons and 70 neutrons
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What percent by mass of each chloroform molecule is composed of chlorine?
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Is it easier to form a positive ion with an element that has a high ionization energy or element that has a low ionization energy? Explain.
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