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How is an exothermic reaction identified on a potential energy diagram?

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Answered by answersmine AT 22/10/2019 – 02:30 AM

Energy diagrams are use to depict the energy changes that occur during a chemical reaction. There are two types of reaction based on the energy change, these are exothermic and endothermic reactions. In endothermic reactions energy are gained while in exothermic reactions energy are lost to the environment. To identify an exothermic reaction on a potential energy diagram, one has to compare the potential energy of the reactants and the products. If the potential energy of the product is less than that of the reactants, the reaction is exothermic.

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What was the governor of Jamestown reaction to bacons rebellion

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Answered by answersmine AT 22/10/2019 – 02:37 AM

1676 – Nathaniel Bacon and other western Virginia settlers were angry at Virginia Governor Berkley for trying to appease the Doeg Indians after the Doegs attacked the western settlements. The frontiersmen formed an army, with Bacon as its leader, which defeated the Indians and then marched on Jamestown and burned the city. The rebellion ended suddenly when Bacon died of an illness.

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According to the law of conservation of mass, in a chemical reaction, the mass of the reactant will always be different from the mass of the product. True Or False

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According to the law of conservation of mass, in a chemical reaction, the mass of the reactant will always be different from the mass of the product. True Or False

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E. solid copper sulfide and silver nitrate react to form copper (ii) nitrate and solid silver sulfide. write a balanced chemical equation that describes the reaction. identify the oxidation number of each element in the reaction. (you do not need to include the total contribution of charge.) is this reaction a redox reaction or a non-redox reaction? explain your answer.

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Answer:

The given reaction is not a redox reaction.

Explanation:

Redox reaction is defined as chemical reaction in oxidation and reduction reactions occurs simultaneously.

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

Reduction reaction is defined as the reaction in which an atom gains electrons. Here, oxidation state of the atom decreases.

Solid copper sulfide when immersed in silver nitrate solution it reacts to form silver sulfide precipitate and copper(II) nitrate solution.

CuS(s)+2AgNO_3(aq)rightarrow Cu(NO_3)_2(aq)+Ag_2S(s)

Oxidation states of elements on reactant side:

Oxidation state of copper  = +2

Oxidation state of sulfur = -2

Oxidation number of silver  +1

Oxidation number of nitrogen = +5

Oxidation number of oxygen = -2

Oxidation states of elements on product side:

Oxidation state of copper  = +2

Oxidation state of sulfur = -2

Oxidation number of silver  +1

Oxidation number of nitrogen = +5

Oxidation number of oxygen = -2

No change in oxidation states of elements is observed which means that the given reaction is not a redox reaction.

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As the names were announced, Omar’s posture straightened. He nodded and stifled a smile as his legs bounced a subtle beat beneath his desk. He closed his eyes briefly, silently willing himself to save his reaction for later. The underlined words reveal Omar’s pride. frustration. discomfort. curiosity.

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As the names were announced, Omar’s posture straightened. He nodded and stifled a smile as his legs bounced a subtle beat beneath his desk. He closed his eyes briefly, silently willing himself to save his reaction for later. The underlined words reveal Omar’s pride. frustration. discomfort. curiosity.

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When a solution of LiC2H3O2 reacts with a solution of MgSO4, what is the net ionic equation? No reaction Mg+2 (aq) + C2H3O2- (aq) → Mg(C2H3O2)2 (s) Mg+2 (aq) + 2C2H3O2- (aq) → Mg(C2H3O2)2 (s) 2Li+ (aq) + SO4-2 (aq) → Li2SO4 (s)

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Answered by answersmine AT 22/10/2019 – 02:56 AM

I think the correct answer would be the first option. When a solution of LiC2H3O2 is mixed  with a solution of MgSO4, no reaction would be observed from the mixture. This is because magnesium cannot replace lithium from the acetate compound. Lithium is the least reactive substance based from the activity series. So, it can only react with a few substances and it does involve the reaction with magnesium sulfate. It is the very least reactive of all the alkali metals. 

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Newton’s third law of motion says that for every action there is a(n) and opposite reaction.

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Answer:

Equal

Explanation:

There are three laws of motion which are called Newtons laws of motion.

According to Newton’s third law of motion, for every action there is an equal and opposite reaction. Action and reaction force both acts on two different bodies.

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If nitrogen and hydrogen combine in a synthesis reaction, what would the product of the reaction be?

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If nitrogen and hydrogen combine in a synthesis reaction, what would the product of the reaction be?

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If 63.8 grams of aluminum metal (Al) react with 72.3 grams of sulfur (S) in a synthesis reaction, how many grams of the excess reactant will be left over when the reaction is complete? Be sure to write out the balanced equation for this reaction and to show all of your work.

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The balanced chemical reaction would be:

16Al + 3S8 = 8Al2S3

We need to determine which reactants are the limiting and the excess. To determine this, we use the initial amounts of the reactants given above. We need to convert them into units of moles and use the balanced reaction to relate the substances calculating the amount needed to react all of the reactants. We do as follows:

63.8 g Al ( 1 mol Al / 26.98 g Al ) ( 3 mol S8 / 16 mol Al ) (256.48 g S / 1 mol S )= 113.72 g S8 needed to completely react
72.3 g S8 ( 1 mol S8 / 256.48 g S8) ( 16 mol Al / 3 mol S8 ) ( 26.98 g / mol ) = 40.56 g Al needed to completely react

Therefore, the excess would be Al and the limiting would be sulfur. The amount excess would be 63.8 g Al  – 40.56 g Al = 23.24 g Al

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Which statement best describes the use of catalytic converters in automobiles? A. They decrease the rate of the reactions that produce harmful gases. B. They oxidize hydrocarbons to form less toxic gases. C. They combine the larger hydrocarbon molecules with smaller ones. D. They increase reaction temperature for cleaner burning.

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Answer:  B. They oxidize hydrocarbons to form less toxic gases.

Explanation:

A catalytic converter is a device which is used in automobile engine to convert the harmful gaseous exhaust into a less toxic pollutant after the process of combustion of the fuel. It conducts an internal redox (oxidation-reduction) reaction in the automobile engine to facilitate such conversion.

On the basis of the above information, They oxidize hydrocarbons to form less toxic gases is the correct option.

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The mass of the products in a reaction is always _______ when compared to the mass of the reactants in a reaction. greater lower equal inversely proportionate

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The mass of the products in a reaction is always _______ when compared to the mass of the reactants in a reaction. greater lower equal inversely proportionate

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Which of the following best summarizes the law of conservation of mass? a. Matter can be changed but not created or destroyed. b. Matter can be destroyed during a chemical reaction. C. Matter that gains mass during a chemical reaction is evidence that matter can be created.

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Which of the following best summarizes the law of conservation of mass? a. Matter can be changed but not created or destroyed. b. Matter can be destroyed during a chemical reaction. C. Matter that gains mass during a chemical reaction is evidence that matter can be created.

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Ccording to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium? A. The equilibrium shifts to the right to favor the formation of products. B. The equilibrium shifts to the left to favor the formation of reactants. C. The equilibrium shifts in the exothermic direction. D. The equilibrium shifts in the endothermic direction.

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Ccording to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium? A. The equilibrium shifts to the right to favor the formation of products. B. The equilibrium shifts to the left to favor the formation of reactants. C. The equilibrium shifts in the exothermic direction. D. The equilibrium shifts in the endothermic direction.

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I NEEED HELP PLEASEEEEEE I WILL RATE BRAINLIEST!!!!!!!!!!!! Select the properly written and balanced equation for the following chemical reaction: Aqueous solutions of sodium hydroxide and iron (III) nitrate react to produce a precipitate of iron (III) hydroxide in an aqueous solution of sodium nitrate. ——-3NaOH (aq) + Fe(NO3)3 (aq) Fe(OH)3 (s) + 3NaNO3 (aq) NaOH (aq) + FeNO3 (aq) FeOH (s) + NaNO3 (aq) NaOH (aq) + Fe(NO3)3 (aq) FeOH3 (s) + NaNO3 (aq) 3NaOH (aq) + FeNO3 (aq) FeOH (s) + 3NaNO3 (aq) I believe that it is the first choice but I am not sure….

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I NEEED HELP PLEASEEEEEE I WILL RATE BRAINLIEST!!!!!!!!!!!! Select the properly written and balanced equation for the following chemical reaction: Aqueous solutions of sodium hydroxide and iron (III) nitrate react to produce a precipitate of iron (III) hydroxide in an aqueous solution of sodium nitrate. ——-3NaOH (aq) + Fe(NO3)3 (aq) Fe(OH)3 (s) + 3NaNO3 (aq) NaOH (aq) + FeNO3 (aq) FeOH (s) + NaNO3 (aq) NaOH (aq) + Fe(NO3)3 (aq) FeOH3 (s) + NaNO3 (aq) 3NaOH (aq) + FeNO3 (aq) FeOH (s) + 3NaNO3 (aq) I believe that it is the first choice but I am not sure….

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A second reaction mixture was made up in the following way: 10 mL 4.0 M acetone + 20 mL 1.0 M HCl + 10 mL 0.0050 M I2 + 10 mL H2O a. What were the initial concentrations of acetone, H+ ion, and I2 in the reaction mixture? (acetone) ___________ M; (H+) ___________ M; (I2)0 ___________ M b. It took 120 seconds for the I2 color to disappear from the reaction mixture when it occurred at the same temperature as the reaction in Problem 2. What was the rate of the reaction?

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A. We can calculate the initial concentrations of each by
the formula:

initial concentration ci = initial volume * initial
concentration / total mixture volume

where,

total mixture volume = 10 mL + 20 mL + 10 mL + 10 mL = 50
mL

ci (acetone) = 10 mL * 4.0 M / 50 mL = 0.8 M

ci (H+) = 20 mL * 1.0 M / 50 mL = 0.4 M               (note: there is only 1 H+ per 1 HCl)

ci (I2) = 10 mL * 0.0050 M / 50 mL = 0.001 M

 

B. The rate of reaction is determined to be complete when all of I2 is consumed. This is signified by complete disappearance of I2 color
in the solution. The rate therefore is:

rate of reaction = 0.001 M / 120 seconds

rate of reaction = 8.33 x 10^-6 M / s

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A second reaction mixture was made up in the following way: 10 mL 4.0 M acetone + 20 mL 1.0 M HCl + 10 mL 0.0050 M I2 + 10 mL H2O a. What were the initial concentrations of acetone, H+ ion, and I2 in the reaction mixture? (acetone) ___________ M; (H+) ___________ M; (I2)0 ___________ M b. It took 120 seconds for the I2 color to disappear from the reaction mixture when it occurred at the same temperature as the reaction in Problem 2. What was the rate of the reaction?

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A. We can calculate the initial concentrations of each by
the formula:

initial concentration ci = initial volume * initial
concentration / total mixture volume

where,

total mixture volume = 10 mL + 20 mL + 10 mL + 10 mL = 50
mL

ci (acetone) = 10 mL * 4.0 M / 50 mL = 0.8 M

ci (H+) = 20 mL * 1.0 M / 50 mL = 0.4 M   (note: there is only 1 H+ per
1 HCl)

ci (I2) = 10 mL * 0.0050 M / 50 mL = 0.001 M

 

B. The rate of reaction is determined to be complete when
all of I2 is consumed. This is signified by complete disappearance of I2 color
in the solution. The rate therefore is:

rate of reaction = 0.001 M / 120 seconds

rate of reaction = 8.33 x 10^-6 M / s

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If 5.0 liters of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction? 2CO (g) + O2 (g) yields 2CO2 (g) 10.0 L 7.5 L 5.0 L 2.5 L

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If 5.0 liters of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction? 2CO (g) + O2 (g) yields 2CO2 (g) 10.0 L 7.5 L 5.0 L 2.5 L

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If a reaction in one direction releases energywhat is the reaction in the opposite direction

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If a reaction in one direction releases energywhat is the reaction in the opposite direction
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At which stage does a gas form in a gas formation reaction

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At which stage does a gas form in a gas formation reaction

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I WILL RATE BRAINLIEST I JUST NEED HELP!!!! In a reaction, 15 moles of carbon dioxide are produced from 5 moles of iron (III) oxide and 15 moles of carbon monoxide. What is the mole ratio of carbon dioxide to carbon monoxide? I am completely lost on this…

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I WILL RATE BRAINLIEST I JUST NEED HELP!!!! In a reaction, 15 moles of carbon dioxide are produced from 5 moles of iron (III) oxide and 15 moles of carbon monoxide. What is the mole ratio of carbon dioxide to carbon monoxide? I am completely lost on this…

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________________ are the body’s adverse reaction to introducing an excessive amount of a toxic substance into the system.

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Hangover

Hangover is unpleasant psychological and physiological effect experienced after consumption of alcohol such as distilled spirit and wine. Hangover usually developed after 6-8 hours and last or 24 hours. Furthermore, hangover, symptoms are related to blood alcohol concentration which is the amount of alcohol present in a person’s blood.

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Which label shows the overall enthalpy change and is the reaction exothermic or endothermic? A, exothermic. B, exothermic. C, endothermic. D, endothermic.

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Please, find attached the image that accompanies this question, which is needed to understand and answer it.

Answer:

  • The label that shows the overall enthalpy change is the label D.
  • The reaction is endothermic.

Thus, the answer is D, endothermic.

Explanation:

You must assume that the base line (the black horizontal line at the bottom, from which the green and black arrows depart) shows the starting enthalpy with which the reactants of the reaction start.

So, the head of the arrow A shows how high the energy of the reaction has increased from the starting energy(that is the activation energy).

From that point, the energy decreases until the line indicated by the head of the arrow D. So, that is how high is the enthalpy of the products resultant of the chemical reaction compared with the enthalpy of the reactants.

The overall enthalpy change (ΔH rxn) is given by the change in the enthalpy of the products less the enthalpy of the reactants:

  • ΔHrxn = ∑H products – ∑ H reactants.

That difference, precisely, is what is shown by the arrow labeled D. So, your first conclusion is that the label that shows the overall enthalpy change is the label D.

As for the second question, an endothermic reaction is that that absorbs energy from the surroundings, and the products end with a higher enthalpy than the reactants. That is what the diagram is showing: the products ended at a higher level than the reactants, so energy was absorbed and the reaction is endothermic.

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According to the video, how was the Banking Act of 1933 a reaction to the Great Depression?

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Answered by answersmine AT 22/10/2019 – 04:01 AM

The Banking Act of 1933 was a reaction to the Great Depression because it worked to protect deposits from risky investments by banks. These investments caused many citizens to lose their money during the Great Depression. Protections occurred through the creation of regulations and new agencies to oversee financial institutions.
This is what it gave me, hopes it helps

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An enzyme is a protein that_____ transports nutrients across a membrane increases the rate of a chemical reaction receives and sends signals across a cell provides structure for the cell’s organelles

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Answer:

The given blank can be filled with that it increases the rate of a chemical reaction.

Explanation:

A substance or a component, which functions as a catalyst in the living species, monitoring the rate at which chemical reactions advances without itself getting changed in the entire process is known as an enzyme. The enzyme works by enhancing the rate of a chemical reaction. The biological procedures that take place inside the living species are the chemical reactions, and the majority of these are monitored by enzymes. In the absence of enzymes, several of these reactions would not occur at the desired rate.

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Which is a product of the cellular respiration reaction? glucose carbon dioxide blood cells

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Which is a product of the cellular respiration reaction? glucose carbon dioxide blood cells

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