Water on mountains starts boiling at a temperature less than 100°C. This phenomenon occurs because the atmospheric pressure is lower at higher altitudes compared to sea level. Boiling occurs when a liquid's vapor pressure equals the surrounding atmospheric pressure. At higher elevations, the reducedRead more
Water on mountains starts boiling at a temperature less than 100°C. This phenomenon occurs because the atmospheric pressure is lower at higher altitudes compared to sea level. Boiling occurs when a liquid’s vapor pressure equals the surrounding atmospheric pressure. At higher elevations, the reduced atmospheric pressure lowers the boiling point of water. For instance, at an elevation of 2,000 meters (approximately 6,561 feet), water boils at about 93°C (199.4°F). This decreased boiling point has practical implications, such as affecting cooking times and methods in mountainous regions. Understanding this concept is essential for activities like mountaineering, high-altitude cooking, and certain industrial processes. Therefore, the correct answer is [A] Less than 100 °C. This reduction in boiling point due to lower atmospheric pressure at high altitudes is a well-established principle in physics and chemistry.
The correct answer is option [B] Melting point. The melting point is the temperature at which a solid substance transitions into its liquid state when heat is applied. At this temperature, the solid's internal structure breaks down, allowing its particles to move freely and assume the liquid state.Read more
The correct answer is option [B] Melting point. The melting point is the temperature at which a solid substance transitions into its liquid state when heat is applied. At this temperature, the solid’s internal structure breaks down, allowing its particles to move freely and assume the liquid state. Options [A] Boiling point and [C] Evaporation refer to processes involving liquid substances, not solids. Therefore, option [B] Melting point accurately describes the temperature associated with the solid-to-liquid phase transition. Option [D] None of these is incorrect, as melting point specifically denotes this transition.
The addition of impurities typically decreases the melting point of a substance. When impurities are introduced into a pure substance, they disrupt the regular arrangement of particles within the crystal lattice. As a result, the cohesive forces between the particles are weakened, requiring less eneRead more
The addition of impurities typically decreases the melting point of a substance. When impurities are introduced into a pure substance, they disrupt the regular arrangement of particles within the crystal lattice. As a result, the cohesive forces between the particles are weakened, requiring less energy to overcome them and transition into the liquid phase. Consequently, the melting point of the impure substance is lower than that of the pure substance. This phenomenon is known as freezing-point depression. Therefore, the answer is [A] decrease.
It’s a common occurrence observed in everyday life, such as adding salt to ice to lower its melting point, facilitating the melting of ice on roads during winter. Therefore, the correct answer is option [A] decrease. Options [B] increase, [C] remain unchanged, and [D] None of these do not accurately describe the effect of impurities on the melting point.
With an increase in pressure, the boiling point of a liquid generally rises. This phenomenon is described by the Clausius–Clapeyron equation, which states that an increase in pressure leads to an increase in the boiling point. Higher pressure compresses the gas phase, making it more difficult for moRead more
With an increase in pressure, the boiling point of a liquid generally rises. This phenomenon is described by the Clausius–Clapeyron equation, which states that an increase in pressure leads to an increase in the boiling point. Higher pressure compresses the gas phase, making it more difficult for molecules to escape into it from the liquid phase. Consequently, a higher temperature is needed to maintain equilibrium between the liquid and gas phases, resulting in a higher boiling point. This relationship between pressure and boiling point is particularly evident in systems like pressure cookers, where increased pressure results in higher cooking temperatures, facilitating faster cooking times. However, it’s essential to note that this relationship may not hold true for all substances, especially those exhibiting anomalous behavior under certain conditions.
The correct answer is option [A] Melting. Melting is the process in which a substance transitions from its solid state to its liquid state upon the application of heat. This occurs when the temperature of the solid reaches its melting point, causing the solid's crystal lattice structure to break dowRead more
The correct answer is option [A] Melting. Melting is the process in which a substance transitions from its solid state to its liquid state upon the application of heat. This occurs when the temperature of the solid reaches its melting point, causing the solid’s crystal lattice structure to break down, allowing its particles to move more freely and adopt the liquid phase. Option [B] Evaporation involves the transition of a liquid to vapor, while option [C] Boiling refers to the rapid vaporization of a liquid at its boiling point. Option [D] None of these is incorrect, as melting specifically denotes the solid-to-liquid phase transition.
The correct answer is option [C] Boiling. Boiling is the process where a substance changes from its liquid state to vapor state throughout the bulk of the liquid, typically occurring at a specific temperature called the boiling point. Option [A] Melting refers to the solid-to-liquid phase transitionRead more
The correct answer is option [C] Boiling. Boiling is the process where a substance changes from its liquid state to vapor state throughout the bulk of the liquid, typically occurring at a specific temperature called the boiling point. Option [A] Melting refers to the solid-to-liquid phase transition. Option [B] Evaporation involves the conversion of a liquid into vapor at the surface, while boiling occurs throughout the liquid. Therefore, option [C] accurately describes the change of state from liquid to vapor. Option [D] None of these is incorrect as boiling specifically denotes this transition.
The correct answer is option [B] higher. Alloys, being mixtures of different metals, often exhibit higher melting points compared to their constituent metals. This is because the addition of different metals alters the atomic structure, creating stronger intermolecular forces that require higher temRead more
The correct answer is option [B] higher. Alloys, being mixtures of different metals, often exhibit higher melting points compared to their constituent metals. This is because the addition of different metals alters the atomic structure, creating stronger intermolecular forces that require higher temperatures to break, thus raising the melting point. Therefore, option [B] is correct. Options [A] lower, [C] equal, and [D] none of these do not accurately represent the typical behavior of alloys, which tend to have higher melting points due to their mixed composition.
The effect on the melting point of a pure substance when another substance is added depends on the nature and quantity of the added substance. Typically, the presence of impurities lowers the melting point of the pure substance. This occurs because impurities disrupt the regular arrangement of partiRead more
The effect on the melting point of a pure substance when another substance is added depends on the nature and quantity of the added substance. Typically, the presence of impurities lowers the melting point of the pure substance. This occurs because impurities disrupt the regular arrangement of particles in the solid, making it easier for the substance to overcome intermolecular forces and transition into the liquid phase. Thus, the correct answer is option [B] Decreases. In some cases, if the added substance forms a compound with the pure substance, it may initially increase the melting point due to stronger intermolecular forces, but eventually, as more impurities are added, the melting point decreases. However, in most scenarios, the presence of impurities leads to a decrease in the melting point of the pure substance.
The correct answer is option [D] All of the above. Sublimate substances refer to those that undergo sublimation, transitioning directly from solid to vapor phase. Camphor, naphthalene, and ammonium chloride are examples of such substances. Camphor and naphthalene are commonly encountered examples, uRead more
The correct answer is option [D] All of the above. Sublimate substances refer to those that undergo sublimation, transitioning directly from solid to vapor phase. Camphor, naphthalene, and ammonium chloride are examples of such substances. Camphor and naphthalene are commonly encountered examples, used in products like mothballs and vaporizers. Ammonium chloride, often used in laboratories, also sublimes when heated, forming white fumes. Therefore, all options—camphor, naphthalene, and ammonium chloride—exhibit sublimation behavior, making option [D] the correct choice.
The correct answer is option [C] Sublimation. Sublimation is the process whereby a solid substance transitions directly into the vapor phase without passing through the liquid phase. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure at a certain temperature, allowingRead more
The correct answer is option [C] Sublimation. Sublimation is the process whereby a solid substance transitions directly into the vapor phase without passing through the liquid phase. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure at a certain temperature, allowing molecules to escape the solid lattice and enter the gas phase. Common examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (naphthalene). Unlike boiling, which involves the conversion of a liquid into vapor, sublimation bypasses the liquid phase entirely. Distillation is a separation technique involving the separation of components in a liquid mixture based on differences in their boiling points. Polymerization is a chemical reaction in which monomers combine to form polymer chains. Thus, only option [C], sublimation, accurately describes the transformation of a solid substance into vapor without becoming a liquid.
Water on mountains starts boiling at the following temperature
Water on mountains starts boiling at a temperature less than 100°C. This phenomenon occurs because the atmospheric pressure is lower at higher altitudes compared to sea level. Boiling occurs when a liquid's vapor pressure equals the surrounding atmospheric pressure. At higher elevations, the reducedRead more
Water on mountains starts boiling at a temperature less than 100°C. This phenomenon occurs because the atmospheric pressure is lower at higher altitudes compared to sea level. Boiling occurs when a liquid’s vapor pressure equals the surrounding atmospheric pressure. At higher elevations, the reduced atmospheric pressure lowers the boiling point of water. For instance, at an elevation of 2,000 meters (approximately 6,561 feet), water boils at about 93°C (199.4°F). This decreased boiling point has practical implications, such as affecting cooking times and methods in mountainous regions. Understanding this concept is essential for activities like mountaineering, high-altitude cooking, and certain industrial processes. Therefore, the correct answer is [A] Less than 100 °C. This reduction in boiling point due to lower atmospheric pressure at high altitudes is a well-established principle in physics and chemistry.
See lessThe temperature at which a solid substance gets converted into liquid after receiving heat is called
The correct answer is option [B] Melting point. The melting point is the temperature at which a solid substance transitions into its liquid state when heat is applied. At this temperature, the solid's internal structure breaks down, allowing its particles to move freely and assume the liquid state.Read more
The correct answer is option [B] Melting point. The melting point is the temperature at which a solid substance transitions into its liquid state when heat is applied. At this temperature, the solid’s internal structure breaks down, allowing its particles to move freely and assume the liquid state. Options [A] Boiling point and [C] Evaporation refer to processes involving liquid substances, not solids. Therefore, option [B] Melting point accurately describes the temperature associated with the solid-to-liquid phase transition. Option [D] None of these is incorrect, as melting point specifically denotes this transition.
See lessWhat effect does the addition of impurities have on the melting point?
The addition of impurities typically decreases the melting point of a substance. When impurities are introduced into a pure substance, they disrupt the regular arrangement of particles within the crystal lattice. As a result, the cohesive forces between the particles are weakened, requiring less eneRead more
The addition of impurities typically decreases the melting point of a substance. When impurities are introduced into a pure substance, they disrupt the regular arrangement of particles within the crystal lattice. As a result, the cohesive forces between the particles are weakened, requiring less energy to overcome them and transition into the liquid phase. Consequently, the melting point of the impure substance is lower than that of the pure substance. This phenomenon is known as freezing-point depression. Therefore, the answer is [A] decrease.
See lessIt’s a common occurrence observed in everyday life, such as adding salt to ice to lower its melting point, facilitating the melting of ice on roads during winter. Therefore, the correct answer is option [A] decrease. Options [B] increase, [C] remain unchanged, and [D] None of these do not accurately describe the effect of impurities on the melting point.
With increase in pressure, the boiling point of a liquid will
With an increase in pressure, the boiling point of a liquid generally rises. This phenomenon is described by the Clausius–Clapeyron equation, which states that an increase in pressure leads to an increase in the boiling point. Higher pressure compresses the gas phase, making it more difficult for moRead more
With an increase in pressure, the boiling point of a liquid generally rises. This phenomenon is described by the Clausius–Clapeyron equation, which states that an increase in pressure leads to an increase in the boiling point. Higher pressure compresses the gas phase, making it more difficult for molecules to escape into it from the liquid phase. Consequently, a higher temperature is needed to maintain equilibrium between the liquid and gas phases, resulting in a higher boiling point. This relationship between pressure and boiling point is particularly evident in systems like pressure cookers, where increased pressure results in higher cooking temperatures, facilitating faster cooking times. However, it’s essential to note that this relationship may not hold true for all substances, especially those exhibiting anomalous behavior under certain conditions.
See lessThe change of state of a substance from solid to liquid is called
The correct answer is option [A] Melting. Melting is the process in which a substance transitions from its solid state to its liquid state upon the application of heat. This occurs when the temperature of the solid reaches its melting point, causing the solid's crystal lattice structure to break dowRead more
The correct answer is option [A] Melting. Melting is the process in which a substance transitions from its solid state to its liquid state upon the application of heat. This occurs when the temperature of the solid reaches its melting point, causing the solid’s crystal lattice structure to break down, allowing its particles to move more freely and adopt the liquid phase. Option [B] Evaporation involves the transition of a liquid to vapor, while option [C] Boiling refers to the rapid vaporization of a liquid at its boiling point. Option [D] None of these is incorrect, as melting specifically denotes the solid-to-liquid phase transition.
See lessThe change of state of a substance from liquid to vapor is called
The correct answer is option [C] Boiling. Boiling is the process where a substance changes from its liquid state to vapor state throughout the bulk of the liquid, typically occurring at a specific temperature called the boiling point. Option [A] Melting refers to the solid-to-liquid phase transitionRead more
The correct answer is option [C] Boiling. Boiling is the process where a substance changes from its liquid state to vapor state throughout the bulk of the liquid, typically occurring at a specific temperature called the boiling point. Option [A] Melting refers to the solid-to-liquid phase transition. Option [B] Evaporation involves the conversion of a liquid into vapor at the surface, while boiling occurs throughout the liquid. Therefore, option [C] accurately describes the change of state from liquid to vapor. Option [D] None of these is incorrect as boiling specifically denotes this transition.
See lessThe melting point of alloys is
The correct answer is option [B] higher. Alloys, being mixtures of different metals, often exhibit higher melting points compared to their constituent metals. This is because the addition of different metals alters the atomic structure, creating stronger intermolecular forces that require higher temRead more
The correct answer is option [B] higher. Alloys, being mixtures of different metals, often exhibit higher melting points compared to their constituent metals. This is because the addition of different metals alters the atomic structure, creating stronger intermolecular forces that require higher temperatures to break, thus raising the melting point. Therefore, option [B] is correct. Options [A] lower, [C] equal, and [D] none of these do not accurately represent the typical behavior of alloys, which tend to have higher melting points due to their mixed composition.
See lessWhat is the effect on the melting point of a pure substance if any other substance is added to it?
The effect on the melting point of a pure substance when another substance is added depends on the nature and quantity of the added substance. Typically, the presence of impurities lowers the melting point of the pure substance. This occurs because impurities disrupt the regular arrangement of partiRead more
The effect on the melting point of a pure substance when another substance is added depends on the nature and quantity of the added substance. Typically, the presence of impurities lowers the melting point of the pure substance. This occurs because impurities disrupt the regular arrangement of particles in the solid, making it easier for the substance to overcome intermolecular forces and transition into the liquid phase. Thus, the correct answer is option [B] Decreases. In some cases, if the added substance forms a compound with the pure substance, it may initially increase the melting point due to stronger intermolecular forces, but eventually, as more impurities are added, the melting point decreases. However, in most scenarios, the presence of impurities leads to a decrease in the melting point of the pure substance.
See lessSublimate substances are
The correct answer is option [D] All of the above. Sublimate substances refer to those that undergo sublimation, transitioning directly from solid to vapor phase. Camphor, naphthalene, and ammonium chloride are examples of such substances. Camphor and naphthalene are commonly encountered examples, uRead more
The correct answer is option [D] All of the above. Sublimate substances refer to those that undergo sublimation, transitioning directly from solid to vapor phase. Camphor, naphthalene, and ammonium chloride are examples of such substances. Camphor and naphthalene are commonly encountered examples, used in products like mothballs and vaporizers. Ammonium chloride, often used in laboratories, also sublimes when heated, forming white fumes. Therefore, all options—camphor, naphthalene, and ammonium chloride—exhibit sublimation behavior, making option [D] the correct choice.
See lessThe transformation of a solid substance directly into vapor state without changing into liquid is called
The correct answer is option [C] Sublimation. Sublimation is the process whereby a solid substance transitions directly into the vapor phase without passing through the liquid phase. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure at a certain temperature, allowingRead more
The correct answer is option [C] Sublimation. Sublimation is the process whereby a solid substance transitions directly into the vapor phase without passing through the liquid phase. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure at a certain temperature, allowing molecules to escape the solid lattice and enter the gas phase. Common examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (naphthalene). Unlike boiling, which involves the conversion of a liquid into vapor, sublimation bypasses the liquid phase entirely. Distillation is a separation technique involving the separation of components in a liquid mixture based on differences in their boiling points. Polymerization is a chemical reaction in which monomers combine to form polymer chains. Thus, only option [C], sublimation, accurately describes the transformation of a solid substance into vapor without becoming a liquid.
See less