Heat is the form of:
Solution:
Heat is a form of energy associated with the motion of atoms or molecules and can be transferred between different systems or objects.
Heat capacity is the product of mass and:
Solution:
Heat capacity is defined as the amount of heat required to raise the temperature of an object by a certain amount and is calculated as the product of the object's mass and its specific heat capacity.
The amount of heat needed to convert a substance from liquid to gas is called:
Solution:
The heat of vaporization is the amount of heat required to convert a unit mass of a substance from liquid to gas without changing its temperature.
Thermal energy transfer required per unit mass to increase the temperature by 1°C or 1 K is called:
Solution:
Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by 1°C or 1 K.
A fixed temperature at which a pure liquid boils is called:
Solution:
The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure, causing the liquid to boil.
The melting point of ice at normal atmospheric pressure is:
Solution:
The melting point of ice at normal atmospheric pressure is 0°C.
Thermal energy transfer required to change a solid into liquid without changing its temperature is called:
Solution:
Latent heat of fusion is the energy required to change a substance from solid to liquid without changing its temperature.
Thermal energy transfer required to change a liquid into gas without changing its temperature is called:
Solution:
Latent heat of vaporization is the energy required to change a substance from liquid to gas without changing its temperature.
Evaporation can occur at:
Solution:
Evaporation can occur at any temperature, not just at the boiling point.
Rate of evaporation of a liquid can be increased by:
Solution:
Increasing the boiling point can increase the rate of evaporation as it provides more energy to the liquid molecules.
Linear thermal expansion of a solid depends upon:
Solution:
Linear thermal expansion depends on the increase in temperature, the original length, and the properties of the material.
What is the SI unit of heat?
Solution:
The SI unit of heat is the Joule (J), which is a unit of energy.
The degree of hotness or coldness of a body is termed:
Solution:
Temperature is a measure of the degree of hotness or coldness of a body.
Convert 25°C to Kelvin.
Solution:
To convert Celsius to Kelvin, add 273 to the Celsius temperature: \( 25°C + 273 = 298 K \).
What is 30°C in Fahrenheit?
Solution:
To convert Celsius to Fahrenheit, use the formula \( F = \frac{9}{5}C + 32 \): \( \frac{9}{5} \times 30 + 32 = 86°F \).
Specific heat capacity is defined as:
Solution:
Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by 1°C.
Thermal capacity of an object equals:
Solution:
Thermal capacity is the product of the mass of the object and its specific heat capacity.
Latent heat of fusion is involved in:
Solution:
Latent heat of fusion is the energy required to change a substance from solid to liquid without changing its temperature.
Evaporation occurs:
Solution:
Evaporation can occur at any temperature and does not require external energy input.
Real expansion of water is calculated by:
Solution:
The real expansion of water is calculated by adding the apparent expansion and the expansion of the flask.
Which factor does NOT affect evaporation?
Solution:
The color of the liquid does not affect the rate of evaporation.
Linear thermal expansion refers to an increase in:
Solution:
Linear thermal expansion refers to the increase in length of a substance due to heating.
Volume thermal expansion depends on:
Solution:
Volume thermal expansion depends on the original volume of the substance.
The formula \( \Delta V = \beta V \Delta T \) represents:
Solution:
The formula \( \Delta V = \beta V \Delta T \) represents volume expansion, where \( \beta \) is the coefficient of volume expansion.
Heat of vaporization is required for:
Solution:
Heat of vaporization is the energy required to convert a liquid into a gas at its boiling point.
What defines the thermal properties of matter?
Solution:
Thermal properties of matter are defined by changes with temperature.
Heat and temperature are different because:
Solution:
Heat is a form of energy, while temperature is a measure of the degree of hotness or coldness.
What is the SI unit of heat?
Solution:
The SI unit of heat is the Joule (J).
To convert Celsius to Kelvin, use:
Solution:
To convert Celsius to Kelvin, add 273 to the Celsius temperature.
The specific heat capacity of water is:
Solution:
The specific heat capacity of water is approximately 4200 J/kg·K.
Which method involves heat transfer through electromagnetic waves?
Solution:
Radiation involves heat transfer through electromagnetic waves.
Absolute zero in Kelvin is:
Solution:
Absolute zero is 0 K, which is the lowest possible temperature.
What does heat capacity depend on?
Solution:
Heat capacity depends on the nature of the material, which includes its specific heat capacity.
Specific heat capacity is defined as the amount of heat required to:
Solution:
Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C.
Which equation correctly represents specific heat capacity?
Solution:
The correct equation for specific heat capacity is \( c = \frac{Q}{m \Delta T} \), where \( Q \) is the heat added, \( m \) is the mass, and \( \Delta T \) is the change in temperature.
The SI unit of specific heat capacity is:
Solution:
The SI unit of specific heat capacity is J/(kg·K).
Which substance has the highest specific heat capacity?
Solution:
Water has the highest specific heat capacity among the given options.
If equal masses of oil and water are heated equally, which heats up faster?
Solution:
Oil heats up faster than water because water has a higher specific heat capacity.
Why is water used in car radiators?
Solution:
Water is used in car radiators because it can absorb a large amount of heat without a significant rise in temperature due to its high specific heat capacity.
What is the definition of "heat of fusion"?
Solution:
Heat of fusion is the amount of heat required to change a unit mass of a substance from solid to liquid at its melting point without changing its temperature.
Which equipment is essential for the experiment to determine latent heat?
Solution:
A thermometer and stopwatch are essential for measuring temperature changes and time during the experiment to determine latent heat.
What is the heat of fusion for water at 0°C?
Solution:
The heat of fusion for water at 0°C is 334 J/g.
During the phase change from water to steam, energy is primarily used to:
Solution:
During the phase change from water to steam, energy is primarily used to break intermolecular forces to form gas.
Heat of vaporization is measured during the conversion of:
Solution:
Heat of vaporization is measured during the conversion of a liquid to a gas.
What is evaporation?
Solution:
Evaporation is the process of converting a liquid into a gas without boiling.
A key difference between evaporation and boiling is:
Solution:
Evaporation can occur at any temperature below the boiling point, while boiling occurs at a specific temperature.
Which process involves bubble formation?
Solution:
Boiling involves the formation of bubbles as the liquid turns into vapor.
Cooling effect is observed in:
Solution:
Evaporation causes a cooling effect as it removes heat from the surroundings.
Which factor increases evaporation rate?
Solution:
A larger surface area increases the evaporation rate by exposing more liquid to the air.
Salty water evaporates slower than pure water due to:
Solution:
Salty water evaporates slower due to the higher solute concentration, which reduces the vapor pressure.
Volatile liquids evaporate quickly because they have:
Solution:
Volatile liquids have low boiling points, which allows them to evaporate quickly.
Wind increases evaporation because it:
Solution:
Wind increases evaporation by removing the vapor near the surface, allowing more liquid to evaporate.
What is the boiling point of chloroform?
Solution:
The boiling point of chloroform is 61.2°C.
Why does a wet hand feel colder in wind?
Solution:
A wet hand feels colder in wind because the wind speeds up the evaporation process, which causes cooling.
What is thermal expansion?
Solution:
Thermal expansion is the increase in size of a substance due to heating.
Linear expansion refers to:
Solution:
Linear expansion refers to the increase in length of a substance due to heating.
The coefficient of volume expansion (β) is related to the coefficient of linear expansion (α) as:
Solution:
The coefficient of volume expansion \( \beta \) is approximately three times the coefficient of linear expansion \( \alpha \).
Why are gaps left between railway tracks?
Solution:
Gaps are left between railway tracks to allow for thermal expansion during hot weather.
Which material has the highest coefficient of linear expansion?
Solution:
Lead has a higher coefficient of linear expansion compared to glass, copper, and quartz.
A bimetallic thermostat works based on:
Solution:
A bimetallic thermostat works based on the different coefficients of linear expansion of two metals, causing them to bend when heated.
Mercury is used in thermometers because it:
Solution:
Mercury is used in thermometers because it does not stick to glass and expands uniformly with temperature changes.
Volumetric expansion occurs in:
Solution:
Volumetric expansion occurs in three dimensions, affecting the volume of a substance.
Quartz has a very low coefficient of expansion, making it suitable for:
Solution:
Quartz's low coefficient of expansion makes it suitable for precision instruments like clocks, where dimensional stability is crucial.