How is heating of sugar and heating of ammonium chloride different from each other? Explain your answer.
QUESTION POSTED AT 03/12/2019 - 10:28 AM
Answered by admin AT 03/12/2019 - 10:28 AM
When sugar is heated it melts and then caramelize giving of water. After this, it turns blank (carbon) and then coverts to co2 (carbon dioxide) .
So, heating of sugar is an endothermic , decomposition and oxidation reaction.
When Ammonium Chloride is heated , it directly goes from solid state to vapour state without changing into liquid state.
So, heating of Ammonium Chloride is an example of sublimation reaction.
So, heating of sugar is an endothermic , decomposition and oxidation reaction.
When Ammonium Chloride is heated , it directly goes from solid state to vapour state without changing into liquid state.
So, heating of Ammonium Chloride is an example of sublimation reaction.
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ANSWERED AT 14/12/2019 - 05:34 PM
QUESTION POSTED AT 14/12/2019 - 05:34 PM
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ANSWERED AT 14/12/2019 - 05:13 PM
QUESTION POSTED AT 14/12/2019 - 05:13 PM
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ANSWERED AT 14/12/2019 - 05:10 PM
QUESTION POSTED AT 14/12/2019 - 05:10 PM
Some people might argue that an orange is a high energy food. Others would disagree and consider a cup of pasta to be a high energy food. How is it possible for both groups of people to argue their position and be correct? Based on the actual biochemistry of the molecules involved, which food has a higher energy content? Explain?
Answer is: pasta has a higher energy content.
Main component of pasta is flour and main component of flour is starch.
Starch (carbohydrate) is a polymeric carbohydrate consisting of a large number of glucose units bonded by glycosidic bond. Starch is a white, tasteless and odorless powder that is insoluble in cold water or alcohol.
Food rich in carbohydrates has high energy content, because human body can digest it very fast.
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ANSWERED AT 14/12/2019 - 04:40 PM
QUESTION POSTED AT 14/12/2019 - 04:40 PM
Based on what you have now learned about biochemistry, predict which one of the three types of carbohydrates (monosaccharide, disaccharide, or polysaccharide) would have more energy stored in its structure. Explain your answer.
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ANSWERED AT 14/12/2019 - 04:38 PM
QUESTION POSTED AT 14/12/2019 - 04:38 PM
Explain in a situation in which the reactant might weigh more than the product
In nuclear reaction, like nuclear fission or nuclear fusion, matter conversion takes place.
This means that the reactants of the equation form new elements as products and a huge amount of energy is released.
Based on this, nuclear reaction are the type of reactions in which the reactant might weigh more than the product.
This means that the reactants of the equation form new elements as products and a huge amount of energy is released.
Based on this, nuclear reaction are the type of reactions in which the reactant might weigh more than the product.
ANSWERED AT 14/12/2019 - 04:38 PM
QUESTION POSTED AT 14/12/2019 - 04:38 PM
Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as
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ANSWERED AT 14/12/2019 - 04:27 PM
QUESTION POSTED AT 14/12/2019 - 04:27 PM
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ANSWERED AT 14/12/2019 - 03:48 PM
QUESTION POSTED AT 14/12/2019 - 03:48 PM
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ANSWERED AT 14/12/2019 - 03:18 PM
QUESTION POSTED AT 14/12/2019 - 03:18 PM
What is the final temperature of 78g sample of water at 99°C if it loses 6500 J of heat energy?
The specific heat of water is 4.184 J/g/°C,
Therefore: 78 g of water at 99°C loses 78 (4.184) = 326 J per °C.
(6500) J / (326 J/°C) = 19.93 °C
So the final temperature is 99-19.93 = 79.07 °C
Therefore: 78 g of water at 99°C loses 78 (4.184) = 326 J per °C.
(6500) J / (326 J/°C) = 19.93 °C
So the final temperature is 99-19.93 = 79.07 °C
ANSWERED AT 14/12/2019 - 03:18 PM
QUESTION POSTED AT 14/12/2019 - 03:18 PM
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ANSWERED AT 14/12/2019 - 03:17 PM
QUESTION POSTED AT 14/12/2019 - 03:17 PM
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ANSWERED AT 14/12/2019 - 03:07 PM
QUESTION POSTED AT 14/12/2019 - 03:07 PM
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ANSWERED AT 14/12/2019 - 02:56 PM
QUESTION POSTED AT 14/12/2019 - 02:56 PM
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freedom of the press
ANSWERED AT 14/12/2019 - 02:55 PM
QUESTION POSTED AT 14/12/2019 - 02:55 PM
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The proliferation of nuclear weapons, The passage after is really unnecessary
ANSWERED AT 14/12/2019 - 02:44 PM
QUESTION POSTED AT 14/12/2019 - 02:44 PM
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ANSWERED AT 14/12/2019 - 02:44 PM
QUESTION POSTED AT 14/12/2019 - 02:44 PM
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ANSWERED AT 14/12/2019 - 02:39 PM
QUESTION POSTED AT 14/12/2019 - 02:39 PM
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ANSWERED AT 14/12/2019 - 02:35 PM
QUESTION POSTED AT 14/12/2019 - 02:35 PM
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ANSWERED AT 14/12/2019 - 02:34 PM
QUESTION POSTED AT 14/12/2019 - 02:34 PM
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ANSWERED AT 14/12/2019 - 02:31 PM
QUESTION POSTED AT 14/12/2019 - 02:31 PM
38 When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is (1) decreased by a factor of 2.(2) increased by a factor of 2. (3) decreased by a factor of 200.(4) increased by a factor of 200.
Increased by a factor of 200
ANSWERED AT 14/12/2019 - 02:30 PM
QUESTION POSTED AT 14/12/2019 - 02:30 PM
Given the equation representing a reaction at equilibrium: H2(g) + I2(g) + heat--> 2HI(g) Which change favors the reverse reaction? (1) decreasing the concentration of HI(g) (2) decreasing the temperature (3) increasing the concentration of I2(g) (4) increasing the pressure
Decreasing the temperature
ANSWERED AT 14/12/2019 - 02:29 PM
QUESTION POSTED AT 14/12/2019 - 02:29 PM
44Given the equation representing a reaction at equilibrium :2SO2(g) + O2(g) ==> 2SO3(g) + heat Which change causes the equilibrium to shift to the right? (1) adding a catalyst (2) adding more O2(g) (3) decreasing the pressure (4) increasing the temperature
(2) Adding more O2(g) would shift the equilibrium to the right because a higher concentration of oxygen is offered than its initial position, therefore more products have to be yielded to maintain equilibrium.
ANSWERED AT 14/12/2019 - 02:28 PM
QUESTION POSTED AT 14/12/2019 - 02:28 PM
A few pieces of dry ice, CO2(s), at -78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask. 80 State the direction of heat flow that occurs between the dry ice and the air in the flask. 81 Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1] 82 Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon.
80. air to dry ice
81. Sublimation
82. the CO2 molecules in the inflated balloon will be at a higher entropy.
81. Sublimation
82. the CO2 molecules in the inflated balloon will be at a higher entropy.
ANSWERED AT 14/12/2019 - 02:26 PM
QUESTION POSTED AT 14/12/2019 - 02:26 PM
The balanced equation below represents a reaction. O2(g) + energy ==> O(g) + O(g) 54 Identify the type of chemical bond in a molecule of the reactant. [1] 55 In the space in your answer booklet, draw a Lewis electron-dot diagram of one oxygen atom. [1] 56 Explain, in terms of bonds, why energy is absorbed during this reaction. [1]
54. Covalent bonds
56. Energy is absorbed because it is required to break the covalent bonds between the two Oxygen atoms.
56. Energy is absorbed because it is required to break the covalent bonds between the two Oxygen atoms.
ANSWERED AT 14/12/2019 - 02:22 PM
QUESTION POSTED AT 14/12/2019 - 02:22 PM
The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separate into two distinct layers because hexane and water have different (1) formula masses (2) molecular polarities (3) pH values (4) specific heats
Answer is: (2) molecular polarities.
Hexane is alkane (acyclic saturated hydrocarbon, carbon-carbon bonds are single) of six carbon atoms.
Hexane (C₆H₁₄) is nonpolar molecule.
Water (H₂O) is polar molecule.
Bonds between oxygen and hydrogen atoms are polar covalent chemical bonds.
Water is polar because of the bent shape of the molecule.
Oxygen atom in water molecule has sp3 hybridization. The bond angle between the two hydrogen atoms is approximately 104.45°.
ANSWERED AT 14/12/2019 - 02:17 PM
QUESTION POSTED AT 14/12/2019 - 02:17 PM
What occurs when a 35-gram aluminum cube at 100.°C is placed in 90. grams of water at 25°C in an insulated cup? (1) Heat is transferred from the aluminum to the water, and the temperature of the water decreases. (2) Heat is transferred from the aluminum to the water, and the temperature of the water increases. (3) Heat is transferred from the water to the aluminum, and the temperature of the water decreases. (4) Heat is transferred from the water to the aluminum, and the temperature of the water increases.
Heat always flows from hot to cold. The aluminum is hotter than the water in the cup so the answer is 2: The heat is transferred from the aluminum to the water, and the temperature of the water increases.
ANSWERED AT 14/12/2019 - 02:16 PM
QUESTION POSTED AT 14/12/2019 - 02:16 PM
In a biochemical reaction, an enzyme acts as a catalyst, causing the (1) activation energy of the reaction to decrease (2) potential energy of the reactants to decrease (3) kinetic energy of the reactants to increase (4) heat of reaction to increase
The question says, in biochemical reactions, enzymes acts as catalyst causing the............. The correct option is A. The minimum energy that must be overcome before a chemical reaction occur is activation energy. Enzymes act as catalyst to lower the activation energy so that the biochemical reaction can occur.
ANSWERED AT 14/12/2019 - 02:15 PM
QUESTION POSTED AT 14/12/2019 - 02:15 PM
The data collected from a laboratory titration are used to calculate the (1) rate of a chemical reaction (2) heat of a chemical reaction (3) concentration of a solution (4) boiling point of a solution
Concentration of a solution
ANSWERED AT 14/12/2019 - 02:13 PM
QUESTION POSTED AT 14/12/2019 - 02:13 PM
What is the property of water, powdered drink mix, and sugar after mixing
When all ingredients are mixed the 2 solids are dissolved into the water making it all liquid but the taste is still there. The drink mix gives it a little flavor and the sugar makes it sweet. The water is there to make it a liquid, it all turns out to be a colored liquid. Hope this helped! :)
ANSWERED AT 14/12/2019 - 02:03 PM
QUESTION POSTED AT 14/12/2019 - 02:03 PM