Chemistry concepts and calculations
117302 questions • Page 1996 / 2347
When a strong base is added to a solution of CUSO_4, which is pale blue, a preci
When a strong base is added to a solution of CUSO_4, which is pale blue, a precipitate forms and the solution above the precipitate is colorless. What is the net chemical equation…
When a strong base is gradually added drop wise to a weak acid, the pH changes a
When a strong base is gradually added drop wise to a weak acid, the pH changes at each addition. When the appropriate quantity of base has been added to react with all of the acid…
When a strong base is gradually added dropwise to a weak acid, the pH changes at
When a strong base is gradually added dropwise to a weak acid, the pH changes at each addition. When the appropriate quantity base been added to react with all of the acid, the pH…
When a strong base is gradually added dropwise to a weak acid, the pH changes at
When a strong base is gradually added dropwise to a weak acid, the pH changes at each addition. When the appropriate quantity of base has been added to react with all of the pH ch…
When a student cleans their dorm room, the entropy of the system must decrease.
When a student cleans their dorm room, the entropy of the system must decrease. How is this NOT a violation of the second law of thermodynamics? possible options: explain the answ…
When a student mixes 50 mL of 1.0 M HCl and 50 mL of 1.0 M NaOH in a coffee-cup
When a student mixes 50 mL of 1.0 M HCl and 50 mL of 1.0 M NaOH in a coffee-cup calorimeter, the temperature of the resultant solution increases from 21.0 degree C to 27.5 degree …
When a student transfered HCL to a graduated cylinder for addition to the sample
When a student transfered HCL to a graduated cylinder for addition to the sample , several drops ran down the outside of the cylinder and on to the laboratory bench . Explan the p…
When a substance is dissolved in water, heat energy is released if: A) the latti
When a substance is dissolved in water, heat energy is released if: A) the lattice energy is positive B) the hydration energy is positive C) the hydration energy is more negative …
When a substance is oxidized, it electrons and its oxidation number When a subst
When a substance is oxidized, it electrons and its oxidation number When a substance is reduced, it electrons and its oxidation number Determine the oxidation number of each cleme…
When a substance is reduced something else has to be oxidized. What is being oxi
When a substance is reduced something else has to be oxidized. What is being oxidized in the process of converting acetaldehyde to ethanol? NADH is oxidized Generally carbohydrate…
When a system is at equilibrium A) do you reverse process is spontaneous but the
When a system is at equilibrium A) do you reverse process is spontaneous but the forward process is not B) The forward in the reverse processes are both spontaneous C)The Forward …
When a system is at equilibrium. the reverse process is spontaneous but the forw
When a system is at equilibrium. the reverse process is spontaneous but the forward process is not the forward and the reverse processes are both spontaneous the forward process i…
When a system is suspected to be infected, one of the measures often recommended
When a system is suspected to be infected, one of the measures often recommended for cleaning the system (without actually taking the "nuke from orbit" approach) is to scan the dr…
When a system must go from a powered down state to a fully operational state wit
When a system must go from a powered down state to a fully operational state without any human intervention it therefore needs access to usable authentication credentials unattend…
When a thin glass tube is put into water, the water rises 1.4 cm. When the same
When a thin glass tube is put into water, the water rises 1.4 cm. When the same tube is put into hexane, the hexane rises only 0.4 cm. Complete the sentences to best explain the d…
When a thin glass tube is put into water, the water rises 1.4 cm. When the same
When a thin glass tube is put into water, the water rises 1.4 cm. When the same tube is put into hexane, the hexane rises only 0.4 cm. Complete the sentences to best explain the d…
When a train\'s velocity is 12.0 m/s eastward, raindrops that are falling vertic
When a train's velocity is 12.0 m/s eastward, raindrops that are falling vertically with respect to the earth make traces that are inclined 30.0 to the vertical on the windows of …
When a user is logged into a web-based application in multiple tabs, and changes
When a user is logged into a web-based application in multiple tabs, and changes their password should it automatically log them out of the other tabs? The use case is an account …
When a user on facebook grants an app access to their account, an API key is iss
When a user on facebook grants an app access to their account, an API key is issued to the app. This key is app and user-specific. This process is described in Facebook's develope…
When a user wants to communicate with another user (let\'s say Alice and Bob), w
When a user wants to communicate with another user (let's say Alice and Bob), what is sent over the network during the initial communication? Alice uses her Kerberos client and en…
When a vehicle is parked in the sunlight on a hot summer day, the temperature in
When a vehicle is parked in the sunlight on a hot summer day, the temperature inside can approach 55 degree C. One company has patented a non-CFC propelled aerosol that can be spr…
When a weak acid is titrated with a strong base, why should the pH at the equiva
When a weak acid is titrated with a strong base, why should the pH at the equivalence point should be greater than 7? Write a reaction to illustrate your explanation. 1. In the fo…
When a wooden log burns it is essentially undergoing a combustion reaction. Usin
When a wooden log burns it is essentially undergoing a combustion reaction. Using this information and what you know about mass conservation explain why the ashes that from a when…
When acetic acid (HC_2 H_3 O_2) is added to water, it reacts to form hydronium i
When acetic acid (HC_2 H_3 O_2) is added to water, it reacts to form hydronium ions (H_3 O^+) and acetate ions (C_2 H_3 O_2) as well as producing heat. HC_2 H_3 O_2 + H_2 O H_3 O^…
When acetic acid is dissolved in water, if reacts to form hydronium and acetate
When acetic acid is dissolved in water, if reacts to form hydronium and acetate anions. This reaction will reach equilibrium, which favors heavily the left side of this equation. …
When acetic acid to dissolved in wafer, it reacts to form hydronium and acetate
When acetic acid to dissolved in wafer, it reacts to form hydronium and acetate anions. This reaction will reach equilibrium, which favors heavily the loft side of this equation. …
When acetone (H_3CCOCH_3) is treated with CH_3MgBr followed by addition of H_2O.
When acetone (H_3CCOCH_3) is treated with CH_3MgBr followed by addition of H_2O. what general class of product results? a) 1 degree alcohol b) 2 degree alochol C) 3 degree alcohol…
When acetylene, C2H2, is burned in oxygen, carbon dioxide and steam are formed.
When acetylene, C2H2, is burned in oxygen, carbon dioxide and steam are formed. A sample of acetylene with volume of 7.50L and a pressure of 1.00atm is burned in excess oxygen at …
When adding dimethylglyoxime to a basic solution, a student observes that format
When adding dimethylglyoxime to a basic solution, a student observes that formation of a red precipitate. What ion is indicated based on this test? Enter your answer as shown here…
When adding dimethylglyoxime to a basic solution, a student observes that format
When adding dimethylglyoxime to a basic solution, a student observes that formation of a red precipitate. What ion is indicated based on this test? Enter your answer as shown here…
When adding the 25 mL of DI water to your saturated solution of calcium hydroxid
When adding the 25 mL of DI water to your saturated solution of calcium hydroxide, you are changing the ion concentration. Why does this not matter? Saturated solutions of barium …
When air (21 mol% O2, 79 mol% N2) is placed in contact with 1000 cm3 of liquid w
When air (21 mol% O2, 79 mol% N2) is placed in contact with 1000 cm3 of liquid water at body temperature, 37°C, and 1 atm absolute, approximately 14.1 standard cubic centimeters […
When air is drawn into a car\'s engine, both N2 and O2 are present. During the c
When air is drawn into a car's engine, both N2 and O2 are present. During the combustion of the gasoline, oxygen reacts with the hydrocarbons in the fuel to produce carbon dioxide…
When alpha -iron is subjected to an atmosphere of nitrogen gas, the concentratio
When alpha -iron is subjected to an atmosphere of nitrogen gas, the concentration of nitrogen in the iron, C_N(in weight percent), is a function of hydrogen pressure, p_N_2 (in MP…
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produ
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. What volume of H2(g) is produced when 6.2g of Al(s) reacts at STP?
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produ
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. What volume of H2(g) is produced when 6.2g of Al(s) reacts at STP?
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produ
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. What volume of H2(g) is produced when 6.2g of Al(s) reacts at STP?
When aluminum metal is added to HCl(aq), H2 gas is produced. When aluminum metal
When aluminum metal is added to HCl(aq), H2 gas is produced. When aluminum metal is added to an aquaeous solution of AgNO3, a reaction occurs, and the aluminum metal disappears an…
When ammonia (NH_3) reacts with fluorine, the products are gaseous dinitrogen te
When ammonia (NH_3) reacts with fluorine, the products are gaseous dinitrogen tetrafluoride (N_2F_4) and hydrogen fluoride (HF). Express your answer as a chemical equation. Identi…
When ammonia gas is dissolved in water, a basic solution of \"ammonium hydroxide
When ammonia gas is dissolved in water, a basic solution of "ammonium hydroxide" (NH4+(aq) and OH (aq)) forms. Which of the following correctly describes the solubility of ammonia…
When ammonia gas is dissolved in water, a basic solution of \"ammonium hydroxide
When ammonia gas is dissolved in water, a basic solution of "ammonium hydroxide" (NH4+(aq) and OH (aq)) forms. Which of the following correctly describes the solubility of ammonia…
When ammonium chloride (NH4Cl) is dissolved in water, the solution becomes colde
When ammonium chloride (NH4Cl) is dissolved in water, the solution becomes colder. Part A Is the dissolution of ammonium chloride endothermic or exothermic? SubmitMy AnswersGive U…
When ammonium chloride crystals are dissolved in water, the temperature of the w
When ammonium chloride crystals are dissolved in water, the temperature of the water decreases. The temperature change indicates that the solution process is (endothermic/exotherm…
When ammonium chloride is dropped into water, the temperature of the solution is
When ammonium chloride is dropped into water, the temperature of the solution is less than the initial temperatures. 4. c. What is happening to the entropy and enthalpy during thi…
When ammonium chloride is dropped into water, the temperature of the solution is
When ammonium chloride is dropped into water, the temperature of the solution is less than the initial temperatures. 4. c. What is happening to the entropy and enthalpy during thi…
When ammonium nitrate dissolves in water, the solution becomes cold. NH_4NO_3(s)
When ammonium nitrate dissolves in water, the solution becomes cold. NH_4NO_3(s) rightarrow NH^+_4 (aq) + NO^-_3 (aq) We can conclude the following: a. Delta H degree is + and Del…
When an API\'s data structure does not fit well with an angular app, I am trying
When an API's data structure does not fit well with an angular app, I am trying to determine the best-practice in my specific design and implementation for converting it to a usab…
When an acid name ends in -ic acid, there is often a related acid whose name end
When an acid name ends in -ic acid, there is often a related acid whose name ends in -ous acid. The formula of the -ous acid has one less oxygen atom than that of the -ic acid. Wi…
When an alcohol (substrate) is placed in an excess equimolar amounts of chloride
When an alcohol (substrate) is placed in an excess equimolar amounts of chloride ions and bromide ions in acid media the corresponding alkyl halides are obtained. The ratio of the…
When an alkene is added to a test tube containing red-brown colored bromine solu
When an alkene is added to a test tube containing red-brown colored bromine solution, it turns colorless even at room temperature. What happens when an alkane is added to the red-…
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