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Questions and Answers
Consider a reaction at equilibrium in a closed system. If the concentration of a gaseous reactant is increased, how will the equilibrium shift according to Le Chatelier's Principle?
Consider a reaction at equilibrium in a closed system. If the concentration of a gaseous reactant is increased, how will the equilibrium shift according to Le Chatelier's Principle?
- The equilibrium will shift to favor the formation of more reactants.
- The equilibrium will shift to decrease the total pressure of the system.
- The equilibrium will not shift, as the change in concentration only affects the rate of the reaction.
- The equilibrium will shift to favor the formation of more products. (correct)
For a certain chemical reaction, the enthalpy change ($\Delta H$) is positive and the entropy change ($\Delta S$) is negative. Under what temperature conditions, if any, will this reaction be spontaneous?
For a certain chemical reaction, the enthalpy change ($\Delta H$) is positive and the entropy change ($\Delta S$) is negative. Under what temperature conditions, if any, will this reaction be spontaneous?
- The reaction will be spontaneous only at low temperatures.
- The reaction will be spontaneous at all temperatures.
- The reaction will be non-spontaneous at all temperatures. (correct)
- The reaction will be spontaneous only at high temperatures.
Which of the following changes will likely increase the rate of a chemical reaction the most, assuming all other factors remain constant?
Which of the following changes will likely increase the rate of a chemical reaction the most, assuming all other factors remain constant?
- Decreasing the concentration of the reactants.
- Decreasing the temperature of the reaction mixture.
- Adding a catalyst to the reaction mixture. (correct)
- Decreasing the surface area of a solid reactant.
An organic compound is found to contain a carbonyl group ($\text{C=O}$) bonded to two distinct alkyl groups. Which of the following classes of compounds does this best describe?
An organic compound is found to contain a carbonyl group ($\text{C=O}$) bonded to two distinct alkyl groups. Which of the following classes of compounds does this best describe?
Which of the following organic compounds would be expected to have the highest boiling point?
Which of the following organic compounds would be expected to have the highest boiling point?
A scientist is studying how different hydrocarbons react under high temperatures. Which branch of chemistry is MOST relevant to this research?
A scientist is studying how different hydrocarbons react under high temperatures. Which branch of chemistry is MOST relevant to this research?
Which state of matter is characterized by having a definite volume but no definite shape?
Which state of matter is characterized by having a definite volume but no definite shape?
Which of the following properties is an intensive property of matter?
Which of the following properties is an intensive property of matter?
Which process represents a chemical change?
Which process represents a chemical change?
Which of the following is an example of a homogeneous mixture?
Which of the following is an example of a homogeneous mixture?
Which separation technique relies on differences in boiling points to separate liquids?
Which separation technique relies on differences in boiling points to separate liquids?
Which of the following statements accurately describes the relationship between elements and compounds?
Which of the following statements accurately describes the relationship between elements and compounds?
A chemist needs to separate a solid precipitate from a liquid. Which of the following methods would be MOST suitable?
A chemist needs to separate a solid precipitate from a liquid. Which of the following methods would be MOST suitable?
In a chemical reaction, 10 grams of reactant A combine with reactant B to produce 15 grams of product C. Applying the law of conservation of mass, what mass of reactant B was used in the reaction?
In a chemical reaction, 10 grams of reactant A combine with reactant B to produce 15 grams of product C. Applying the law of conservation of mass, what mass of reactant B was used in the reaction?
During a laboratory experiment, a student observes that a reaction between two solutions results in the formation of a solid precipitate along with heat generation. Which type of reaction is most likely occurring?
During a laboratory experiment, a student observes that a reaction between two solutions results in the formation of a solid precipitate along with heat generation. Which type of reaction is most likely occurring?
If you have 2 moles of hydrogen gas (Hâ‚‚) and 1 mole of oxygen gas (Oâ‚‚), how many moles of water (Hâ‚‚O) can theoretically be produced, assuming the reaction goes to completion?
If you have 2 moles of hydrogen gas (Hâ‚‚) and 1 mole of oxygen gas (Oâ‚‚), how many moles of water (Hâ‚‚O) can theoretically be produced, assuming the reaction goes to completion?
In a reaction where the theoretical yield of a product is 25.0 grams, a student collects 20.0 grams of the product. What is the percent yield of the reaction?
In a reaction where the theoretical yield of a product is 25.0 grams, a student collects 20.0 grams of the product. What is the percent yield of the reaction?
An atom has a mass number of 40 and contains 20 neutrons. What is its atomic number?
An atom has a mass number of 40 and contains 20 neutrons. What is its atomic number?
Which of the following electron configurations violates Hund's Rule for a carbon atom in its ground state?
Which of the following electron configurations violates Hund's Rule for a carbon atom in its ground state?
An element 'X' is a shiny, malleable solid that conducts electricity. It reacts violently with water. Which group in the periodic table does element 'X' most likely belong to?
An element 'X' is a shiny, malleable solid that conducts electricity. It reacts violently with water. Which group in the periodic table does element 'X' most likely belong to?
Which type of chemical bond is formed when electrons are shared between two atoms?
Which type of chemical bond is formed when electrons are shared between two atoms?
What is the correct name for the compound Nâ‚‚Oâ‚…?
What is the correct name for the compound Nâ‚‚Oâ‚…?
According to VSEPR theory, what is the molecular geometry of a molecule with four bonding pairs and no lone pairs around the central atom?
According to VSEPR theory, what is the molecular geometry of a molecule with four bonding pairs and no lone pairs around the central atom?
Which type of intermolecular force is primarily responsible for the high boiling point of water (Hâ‚‚O)?
Which type of intermolecular force is primarily responsible for the high boiling point of water (Hâ‚‚O)?
A gas occupies a volume of 10.0 L at standard temperature and pressure (STP). If the amount of gas is doubled, what will be the new volume, assuming temperature and pressure remain constant?
A gas occupies a volume of 10.0 L at standard temperature and pressure (STP). If the amount of gas is doubled, what will be the new volume, assuming temperature and pressure remain constant?
A solution contains 40 grams of NaCl in 200 mL of water. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)
A solution contains 40 grams of NaCl in 200 mL of water. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)
A substance is known to readily accept protons. Based on this property, how would the substance be classified?
A substance is known to readily accept protons. Based on this property, how would the substance be classified?
Consider the reversible reaction: $A + B
ightleftharpoons C + D$. At equilibrium, the concentration of reactants A and B are high, while the concentration of products C and D are low. What does this indicate about the equilibrium constant (K)?
Consider the reversible reaction: $A + B ightleftharpoons C + D$. At equilibrium, the concentration of reactants A and B are high, while the concentration of products C and D are low. What does this indicate about the equilibrium constant (K)?
Flashcards
What is Chemistry?
What is Chemistry?
The study of matter, its properties, and how it changes.
What is Matter?
What is Matter?
Anything that has mass and takes up space.
What is a Physical Property?
What is a Physical Property?
A characteristic observed without changing the substance's composition.
What is a Chemical Property?
What is a Chemical Property?
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What is a Physical Change?
What is a Physical Change?
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What is a Chemical Change?
What is a Chemical Change?
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What is a Mixture?
What is a Mixture?
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What is an Element?
What is an Element?
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Le Chatelier's Principle
Le Chatelier's Principle
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Entropy (S)
Entropy (S)
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Gibbs Free Energy (G)
Gibbs Free Energy (G)
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Catalysts
Catalysts
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Hydrocarbons
Hydrocarbons
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Reactants
Reactants
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Products
Products
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Law of Conservation of Mass
Law of Conservation of Mass
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Mole
Mole
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Avogadro's Number
Avogadro's Number
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Molar Mass
Molar Mass
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Limiting Reactant
Limiting Reactant
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Protons
Protons
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Neutrons
Neutrons
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Electrons
Electrons
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Atomic Number
Atomic Number
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Groups
Groups
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Chemical Bond
Chemical Bond
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Covalent Bond
Covalent Bond
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Intermolecular Forces
Intermolecular Forces
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Study Notes
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Description
Chemistry explores matter, its properties, and transformations. Key branches include analytical, biochemical, and organic chemistry. Matter exists in solid, liquid, gas, and plasma states, each with unique physical and chemical properties.
