Chemical Reactions of Metals and Acids

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Questions and Answers

What is produced when a metal reacts with an acid?

  • Salt and hydrogen gas (correct)
  • Water and carbon dioxide
  • Salt and water
  • Salt and oxygen gas

What is the chemical formula for sodium zincate?

  • Zn(OH)2
  • Na2ZnO2 (correct)
  • NaOH
  • ZnO

In Activity 2.4, which metal reacts with sodium hydroxide?

  • Zinc (correct)
  • Copper
  • Magnesium
  • Iron

What gas is formed when sodium hydroxide reacts with zinc?

<p>Hydrogen (D)</p> Signup and view all the answers

What is the chemical formula for sodium carbonate?

<p>Na2CO3 (D)</p> Signup and view all the answers

In Activity 2.5, what is added to the test tubes containing sodium carbonate and sodium hydrogencarbonate?

<p>Hydrochloric acid (A)</p> Signup and view all the answers

What is the chemical formula for sodium hydrogencarbonate?

<p>NaHCO3 (C)</p> Signup and view all the answers

In the experiment with metal carbonates and hydrogencarbonates, the gas produced is passed through which substance?

<p>Lime water (D)</p> Signup and view all the answers

Which gas is produced when metal carbonates react with acids?

<p>Carbon dioxide (B)</p> Signup and view all the answers

What type of reaction is described by: Acid + Metal → Salt + Hydrogen gas

<p>Displacement (A)</p> Signup and view all the answers

What is the general product when a metal reacts with an acid?

<p>Salt and hydrogen gas (C)</p> Signup and view all the answers

Which of the following is true about the reaction between metals and acids?

<p>The metal displaces hydrogen atoms from the acid. (D)</p> Signup and view all the answers

What is the role of granulated zinc metal in the reaction with sodium hydroxide?

<p>To react with sodium hydroxide to form sodium zincate and hydrogen gas (D)</p> Signup and view all the answers

Which of the following statements is most accurate regarding metal reactions with sodium hydroxide?

<p>Only certain metals react with sodium hydroxide. (A)</p> Signup and view all the answers

In Activity 2.5, what is the purpose of passing the gas produced through lime water?

<p>To identify the gas produced. (B)</p> Signup and view all the answers

What is observed when carbon dioxide gas is passed through lime water (calcium hydroxide solution)?

<p>The lime water turns milky. (A)</p> Signup and view all the answers

If you react $Na_2CO_3$ and $NaHCO_3$ separately with dilute $HCl$, what gas is produced in both cases?

<p>Carbon Dioxide (C)</p> Signup and view all the answers

What type of chemical reaction takes place when metal carbonates or hydrogencarbonates react with acids?

<p>Neutralization (D)</p> Signup and view all the answers

What is the purpose of using dilute $HCl$ (hydrochloric acid) in Activity 2.5?

<p>To react with sodium carbonate and sodium hydrogencarbonate. (C)</p> Signup and view all the answers

Which of the following is the most likely observation when dilute hydrochloric acid ($HCl$) is added to sodium hydrogencarbonate ($NaHCO_3$)?

<p>Effervescence (bubbling) occurs. (A)</p> Signup and view all the answers

Which statement accurately describes how metals interact with acids, based on the general reaction?

<p>Metals donate electrons to the acid, resulting in salt formation and the release of hydrogen gas. (B)</p> Signup and view all the answers

Why are some metals unable to react with sodium hydroxide to produce hydrogen gas?

<p>The activation energy for the reaction is too high for these metals under standard conditions. (B)</p> Signup and view all the answers

Which option accurately describes the role of sodium hydroxide in the reaction with zinc?

<p>Sodium hydroxide acts as a complexing agent, facilitating zinc dissolution and hydrogen gas release. (B)</p> Signup and view all the answers

What is the significance of passing the gas produced from the reaction of metal carbonates and hydrogencarbonates through lime water?

<p>To confirm the presence of carbon dioxide. (A)</p> Signup and view all the answers

In the reaction between metal carbonates and hydrochloric acid, what determines the rate of gas production?

<p>The strength of the hydrochloric acid and the surface area of the carbonate. (D)</p> Signup and view all the answers

Why do metal hydrogencarbonates typically react more vigorously with acids compared to metal carbonates?

<p>Hydrogencarbonates contain an additional hydrogen ion, facilitating a more rapid proton transfer. (D)</p> Signup and view all the answers

Considering the reaction of zinc with sodium hydroxide, how would increasing the concentration of sodium hydroxide affect the reaction rate, assuming excess zinc is present?

<p>The reaction rate would increase up to a point, then level off as the reaction becomes limited by the zinc surface area. (B)</p> Signup and view all the answers

If a student mistakenly uses concentrated hydrochloric acid instead of dilute hydrochloric acid in Activity 2.5, what is the most likely outcome?

<p>The reaction will proceed violently, potentially causing the acid to splash out of the test tube. (B)</p> Signup and view all the answers

A student performs Activity 2.5 but observes no change in the lime water. Which of the following is the most probable cause?

<p>The delivery tube was not placed below the surface of the lime water. (B)</p> Signup and view all the answers

How does the presence of impurities in a metal carbonate sample affect its reaction with hydrochloric acid?

<p>Impurities can either increase or decrease the reaction rate depending on their chemical properties. (D)</p> Signup and view all the answers

Consider a scenario where a novel metal, tentatively named 'Element X', is reacted with an exotic acid, 'Acid Y', resulting in the evolution of a gas and the formation of a complex salt. Spectroscopic analysis of the gas reveals it to be diatomic but with an unexpectedly high isotopic mass. Which factor would MOST influence the rate of this reaction?

<p>The overpotential for hydrogen evolution on Element X and the concentration of Acid Y. (B)</p> Signup and view all the answers

A researcher investigates the reaction between a newly synthesized metal alloy (comprising 70% Zinc, 20% Aluminum, and 10% exotic metal 'Q') and sodium hydroxide solution. Upon reaction, a gas is evolved, and a complex anionic species is formed in the solution. Given that Aluminum also reacts with $NaOH$, albeit at a different rate, what experimental technique would BEST elucidate the individual contributions of Zinc and Aluminum to the overall reaction kinetics and product distribution?

<p>Electrochemical Impedance Spectroscopy ($EIS$) to analyze the interfacial charge transfer resistance of the alloy in $NaOH$ solution. (C)</p> Signup and view all the answers

In a highly controlled microfluidic experiment, sodium carbonate ($Na_2CO_3$) and sodium bicarbonate ($NaHCO_3$) solutions are reacted with hydrochloric acid ($HCl$) at varying flow rates and concentrations within separate channels. Downstream of the reaction zones, the evolved $CO_2$ gas is passed through a nanofluidic chamber containing a pH-sensitive fluorescent dye. Which parameter would provide the MOST sensitive and accurate measure to differentiate the subtle kinetic differences between the reactions of $Na_2CO_3$ and $NaHCO_3$ with $HCl$?

<p>The time-resolved fluctuations in the fluorescence signal, analyzed using Fourier Transform methods to identify characteristic frequencies. (C)</p> Signup and view all the answers

Consider a scenario where a sample of calcium hydroxide solution [lime water, $Ca(OH)_2$] is contaminated with a trace amount of strontium hydroxide [$Sr(OH)_2$]. This contaminated lime water is used to test for the presence of carbon dioxide gas evolved from the reaction of a metal carbonate with an acid. What analytical challenge is MOST likely to arise and why?

<p>The reaction endpoint determination will be ambiguous due to the similar solubility products ($K_{sp}$) of $CaCO_3$ and $SrCO_3$, leading to overlapping precipitation curves. (D)</p> Signup and view all the answers

A novel experimental setup involves reacting a metal carbonate ($MCO_3$) with a Brønsted acidic ionic liquid instead of a traditional aqueous acid. The evolved $CO_2$ gas is then passed through a microreactor containing a metal-organic framework ($MOF$) functionalized with amine groups. What is the MOST probable outcome of using this setup, considering the unique properties of ionic liquids and MOFs?

<p>Enhanced $CO_2$ capture within the MOF due to the increased solubility of $CO_2$ in the ionic liquid, but with slower reaction kinetics due to the lower proton activity of the ionic liquid. (B)</p> Signup and view all the answers

Considering the reaction between granulated zinc and sodium hydroxide, imagine the reaction is conducted in a non-aqueous, aprotic solvent with a crown ether complexing the sodium cation. How would this modification MOST likely affect the reaction pathway and kinetics?

<p>It would decrease the reaction rate by reducing the effective concentration of free hydroxide ions available for reaction. (A)</p> Signup and view all the answers

A researcher attempts to perform Activity 2.5 using a novel metal sesquicarbonate ($M_2(CO_3)_3$) instead of sodium carbonate or bicarbonate and reacts this with deuterated hydrochloric acid ($DCl$). The evolved gas is then analyzed using mass spectrometry. Predict the MOST significant isotopic species observed in the mass spectrum and its origin.

<p>$^{12}C^{16}O^{16}OD$ at m/z 45, resulting from the reaction with $DCl$. (A)</p> Signup and view all the answers

Imagine that the carbon dioxide evolved from reacting $Na_2CO_3$ with $HCl$ is bubbled through a solution of strontium hydroxide [$Sr(OH)_2$] instead of calcium hydroxide. Further, this entire process is conducted under a controlled atmosphere with elevated partial pressure of argon. Which outcome would MOST reasonably be hypothesized?

<p>Slower formation of strontium carbonate precipitate due to decreased $CO_2$ solubility in the solution caused by the argon atmosphere. (D)</p> Signup and view all the answers

A student, attempting to replicate Activity 2.5, mistakenly uses ethanoic acid (acetic acid, $CH_3COOH$) instead of hydrochloric acid ($HCl$). He observes a much slower rate of gas evolution. To enhance the reaction rate without adding a strong acid, which of the following strategies would be MOST effective, assuming all other parameters remain constant?

<p>Increase the temperature of the reaction mixture and add a small amount of a phase-transfer catalyst. (C)</p> Signup and view all the answers

In a sophisticated experiment, a metal 'M' is reacted with an acid in the presence of a redox-active ligand. The ligand is designed to coordinate with the metal cation formed during the reaction and potentially influence the electron transfer process. How would the presence of such a ligand MOST likely impact the observed reaction mechanism?

<p>It could either accelerate or decelerate the reaction based on the ligand's redox potential and its interaction with the metal cation's electronic structure. (A)</p> Signup and view all the answers

What is the general equation representing the reaction between an acid and a metal?

<p>Acid + Metal → Salt + Hydrogen gas (C)</p> Signup and view all the answers

In the reaction between sodium hydroxide and zinc, what is the chemical formula of the salt formed?

<p>Naâ‚‚ZnOâ‚‚ (A)</p> Signup and view all the answers

Which of the following is NOT a universal outcome of reactions between metals and acids or bases?

<p>Reaction occurring with all metals (A)</p> Signup and view all the answers

What is the expected observation when carbon dioxide gas is passed through lime water?

<p>The lime water turns milky. (A)</p> Signup and view all the answers

Which of the following statements best describes the reaction between metal carbonates/hydrogencarbonates and acids?

<p>Carbon dioxide gas is produced. (D)</p> Signup and view all the answers

What is the purpose of using lime water in the experiment with metal carbonates and hydrogencarbonates?

<p>To identify the gas produced. (D)</p> Signup and view all the answers

A student observes a vigorous reaction when adding dilute $HCl$ to an unknown substance, producing a colorless, odorless gas. Which of the following substances is MOST likely reacting with the acid?

<p>Sodium carbonate ($Na_2CO_3$) (B)</p> Signup and view all the answers

Which of the following modifications to Activity 2.5 would MOST likely result in a decrease in the observed rate of carbon dioxide production?

<p>Cooling the test tubes in an ice bath. (C)</p> Signup and view all the answers

Consider a hypothetical scenario where a novel metal 'X' reacts with hydrochloric acid to produce a salt $XCl_2$ and a gas. The gas, when bubbled through a solution of barium hydroxide ($Ba(OH)_2$), forms a white precipitate that is insoluble in excess barium hydroxide but dissolves upon the addition of dilute hydrochloric acid. What is the MOST likely identity of the gas?

<p>Carbon Dioxide ($CO_2$) (B)</p> Signup and view all the answers

A research team is investigating the reaction mechanism between a newly discovered metal sesquicarbonate, $M_2(CO_3)_3$, and a weak organic acid (HA) in a non-aqueous solvent. They observe that the reaction proceeds through a multi-step pathway involving the formation of several intermediate species. To elucidate the detailed reaction kinetics and identify these intermediates, which of the following experimental techniques would provide the most comprehensive information?

<p>In-situ Infrared Spectroscopy coupled with Mass Spectrometry (D)</p> Signup and view all the answers

Flashcards

Metal Displacement Reaction

A reaction where a metal displaces hydrogen from an acid to form a salt and hydrogen gas.

General Reaction Equation

The general equation for a metal reacting with an acid: Acid + Metal → Salt + Hydrogen gas.

Sodium Zincate

A compound formed when zinc reacts with sodium hydroxide solution.

Hydrogen Gas from Reactions

Hydrogen gas is produced when metals react with acids or bases.

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Sodium Carbonate Reaction

Sodium carbonate (Na2CO3) reacts with dilute hydrochloric acid to form sodium chloride, carbon dioxide, and water.

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Sodium Hydrogencarbonate Reaction

Sodium hydrogencarbonate (NaHCO3) reacts with dilute hydrochloric acid similarly, producing carbon dioxide.

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Lime Water Test

A method to detect carbon dioxide gas by passing it through lime water to form a milky solution.

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Observing Gas Production

The reaction between sodium carbonate/sodium hydrogencarbonate and acid produces a gas, usually carbon dioxide.

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Acid + Carbonate Reaction

When an acid reacts with a carbonate, it produces salt, water, and carbon dioxide.

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Acid + Metal Carbonate Equation

For metals carbonates: Acid + Metal Carbonate → Salt + Water + Carbon Dioxide.

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Sodium Zincate Formation

The creation of sodium zincate when zinc reacts with sodium hydroxide.

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Hydrogen Production in Reactions

Hydrogen gas is generated when zinc reacts with sodium hydroxide.

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Reaction with Sodium Hydroxide

The reaction of zinc and sodium hydroxide can be represented as: 2NaOH + Zn → Na2ZnO2 + H2.

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Metal Carbonate Reaction with Acid

The reaction of a metal carbonate with an acid produces salt, water, and carbon dioxide.

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Sodium Carbonate in Test Tube A

Sodium carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide.

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Sodium Hydrogencarbonate in Test Tube B

Sodium hydrogencarbonate reacts with hydrochloric acid producing carbon dioxide and salt.

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Observing Gas from Metal Carbonates

Carbon dioxide gas can be tested by passing it through lime water, causing it to form a milky solution.

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Lime Water Reaction with CO2

Carbon dioxide reacts with lime water to form calcium carbonate, which appears as a cloudy precipitate.

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Reaction Conditions for Acids

Not all metals react with acids; this is specific to certain metals like zinc.

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Test for Hydrogen Gas

In metal-acid reactions, hydrogen gas production can be tested by observing bubbles.

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Metal Reaction with Acids

When a metal reacts with an acid, it produces a salt and hydrogen gas.

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Granulated Zinc Reaction

Zinc reacts with sodium hydroxide to form sodium zincate and hydrogen gas.

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Sodium Carbonate Reaction Observation

Sodium carbonate reacts with dilute HCl, producing carbon dioxide, water, and salt.

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Sodium Hydrogencarbonate Reaction Observation

Sodium hydrogencarbonate reacts with dilute HCl to produce carbon dioxide, water, and salt.

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Gas Testing Method

Passing gas through lime water detects carbon dioxide by forming a milky solution.

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Reaction Products of Acids with Carbonates

Acids reacting with carbonates yield salt, water, and carbon dioxide gas.

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Lime Water Characteristics

Lime water turns milky in the presence of carbon dioxide due to calcium carbonate formation.

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Test Tube A Reaction

In Test Tube A, sodium carbonate reacts with HCl to release carbon dioxide gas.

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Test Tube B Reaction

In Test Tube B, sodium hydrogencarbonate reacts with HCl also releasing carbon dioxide.

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Metal Carbonate vs. Metal Hydrogencarbonate

Both react similarly with acids, but have different components in their structure.

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Reaction of Metal with Acid

When a metal reacts with an acid, it produces a salt and hydrogen gas.

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Sodium Hydroxide and Zinc Reaction

The reaction of zinc with sodium hydroxide produces sodium zincate and hydrogen gas.

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Gas in Sodium Hydroxide Reaction

Hydrogen gas is released when zinc reacts with sodium hydroxide solution.

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Reactions of Metal Carbonates

Metal carbonates react with acids to produce salts, water, and carbon dioxide gas.

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Dilute HCl with Sodium Carbonate

Sodium carbonate reacts with dilute hydrochloric acid, releasing carbon dioxide gas.

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Hydrogen from Carbonate Reactions

Carbonates release hydrogen gas when they react with acids.

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Lime Water Test for CO2

Passing gas through lime water tests for carbon dioxide, forming a milky solution.

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Difference between Carbonate and Hydrogencarbonate

Metal carbonates and metal hydrogencarbonates react similarly, but differ in chemical composition.

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Observations of Gas Production

Both sodium carbonate and sodium hydrogencarbonate reactions produce observable gases.

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Metal Displacement Summary

When a metal reacts with an acid, it produces a salt and hydrogen gas.

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Sodium Carbonate Reaction Products

Sodium carbonate reacts with dilute HCl to produce sodium chloride, water, and carbon dioxide.

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Sodium Hydrogencarbonate Reaction Products

Sodium hydrogencarbonate reacts with dilute HCl to produce carbon dioxide, water, and sodium chloride.

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Gas Identification Method

Passing gas through lime water detects carbon dioxide by turning it milky.

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Zinc and Sodium Hydroxide Reaction

Zinc reacts with sodium hydroxide to produce sodium zincate and hydrogen gas.

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Hydrogen from Metal Reactions

Hydrogen gas is produced when certain metals react with acids or bases.

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Acid and Metal Carbonate Reaction

Acids react with metal carbonates to produce salt, water, and carbon dioxide.

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Testing for Hydrogen Gas

Hydrogen gas is identified by observing bubbling during acid reactions.

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Carbon Dioxide Production

Produced during reactions of metal carbonates or hydrogencarbonates with acids.

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Study Notes

Metal Reactions with Acids

  • Metals react with acids to produce a salt and hydrogen gas
  • The general equation is: Acid + Metal → Salt + Hydrogen gas

Activity 2.4: Zinc and Sodium Hydroxide

  • Place zinc in a test tube
  • Add sodium hydroxide solution
  • Warm the contents
  • Observe the reaction
  • Zinc reacts with sodium hydroxide to form sodium zincate and hydrogen gas
  • Equation: 2NaOH(aq) + Zn(s) → Naâ‚‚ZnOâ‚‚(s) + Hâ‚‚(g) (Sodium zincate)

Metal Carbonates and Acids

  • Metal carbonates react with acids to produce a salt, water, and carbon dioxide gas
  • General equation (for sodium carbonate): Naâ‚‚CO₃(s) + 2HCl(aq) → 2NaCl(aq) + Hâ‚‚O(l) + COâ‚‚(g)
  • General equation (for sodium hydrogencarbonate): NaHCO₃(s) + HCl(aq) → NaCl(aq) + Hâ‚‚O(l) + COâ‚‚(g)
  • Observe the gas produced by passing it through limewater (calcium hydroxide solution)
  • The carbon dioxide gas will react with limewater (calcium hydroxide solution) to produce a white precipitate (calcium carbonate)
  • Use about 0.5g of sodium carbonate in test tube A and about 0.5g of sodium hydrogencarbonate in test tube B
  • Add about 2 mL of dilute HCl to both test tubes
  • Pass the gas through limewater
  • Observe the result - white precipitate in the lime water from the carbon dioxide
  • Use test tubes labeled A and B
  • Use two test tubes labeled A and B

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