Phase Changes

Topic Page

Questions

• How do phase changes occur on a molecular level?
• How do phase changes work?
• How can I calculate phase changes?
• What are the phase changes of water?
• What phase change of water releases heat?
• Question #92c2c
• Question #3ad50
• Question #e658c
• Question #d81f8
• If you boil 100g of water until there is no liquid left what mass of water vapor will you get?
• What happens when the temperature of a liquid reaches its freezing point?
• What happens when the temperature of a solid reaches its melting point?
• Which is the state change in which a gas becomes a liquid?
• Explain how convection, conduction, phase transitions, average kinetic energy, and equilibrium are related?
• Which change in state requires that energy be added to the substance?
• What are the three phase changes that require energy to perform?
• What happens to the temperature during a phase change?
• What happens to liquids when they get hot?
• What is Mayer's formula ?
• Why do liquids solidify when they are cooled?
• Heat is removed from a gas, and the substance becomes a liquid. How can you explain this?
• Question #2f2ad
• What is the process that changes a substance from a liquid to a gas below the substance's boiling point?
• During what type of phase change does a substance release energy to its surroundings?
• What does a positive or negative liquid-solid slope indicate in a phase diagram?
• As the pressure increases, how does the boiling point change?
• Why does temperature remain constant during phase change?
• What is condensation, and why is it also a warming process?
• Question #a18ce
• How are the particles in a block of iron affected when the block is melted?
• Question #0e1e8
• What causes the change of state in matter?
• Can matter undergo phase transitions?
• Question #d1e54
• At what temperature does ice melt?
• If you have a glass of ice water outside on a hot day, sometimes people say the glass is sweating. What is really happening to the glass of water?
• Question #c4205
• What does salt do to ice?
• What is a Phase diagram?
• What does the triple point on the phase diagram of water represent?
• What type of change is evaporation?
• When matter is transformed from the liquid state to the gas state, what happens to the distance and attraction between particles?
• What is an example of adding energy to a substance and causing a physical change?
• What process allows perspiration to cool the body?
• When an ice cube is changing from the solid phase to the liquid phase, what happens to the temperature during the phase change?
• Suppose a phase transition occurs between a liquid and gas at -196 C What is the Kelvin temperature?
• Question #18a77
• What is the process of changing a solid substance directly to vapor without going through the liquid phase called?
• What condition applies when water boils at 100 C?
• Why does 2 liters of boiling water not have twice as great a temperature as 1 liter of boiling water?
• How is the melting point of a substance related to its freezing point?
• Compared with the melting points of ionic compounds, the melting points of molecular solids tend to be what?
• What point is the temperature at which water begins to condense?
• When you cool liquid water to 0C, what will happen?
• Given the following, how many degrees must the temperature drop for the antifreeze to turn to ice?
• Question #6c28d
• Potassium chlorate decomposes to potassium chloride and oxygen gas. Is this a physical or chemical change?
• Question #fa276
• Under normal conditions, how could you reduce air pressure?
• What is the rate of melting and boiling called?
• Melting is the change of matter from which phases?
• What is the change in state from a liquid to a gas called?
• What are two types of vaporization?
• What is the normal melting point of a substance called?
• What phase change is happening on the outside of the dry ice? How do you know?
• Why does ice melt quicker when it is on the aluminum than when it is on plastic?
• Does dry ice melt or evaporate?
• What is the melting point in degrees Celsius of gold?
• When dry ice is exposed to the air it changes to a vapor. What is an example of?
• At what temperature does water boil and freeze in Kelvin?
• What is the difference between evaporation and condensation?
• Why do glass bottles with water break when kept in freezer?
• What happenes to the temperature during a phase change?
• When butter is heated melts, and when that melted butter cools and solidifies what is the process called?
• At is caused by the condensation of water vapor?
• Under what conditions is the freezing of water spontaneous? Why?
• Under what conditions is the melting of ice spontaneous? Why?
• Under what conditions is the freezing of water as likely as the melting of ice?
• What be involved in the process that is opposite to sublimation? Do you think such a process exists? would Why why not?
• Will adding energy to matter cause the matter to change state?
• If a gas turns into a liquid, does it lose energy?
• Question #2dd06
• What is the change of phase from a gas to a liquid called?
• What kind of change occurs when ice becomes liquid water?
• What is the purpose of melting point in organic chemistry?
• What is meant by the term, #"sublimation"#?
• What is the process of a solid becoming a liquid called?
• A gas becomes a liquid through what process?
• When fluorite is exposed to ultraviolet light, does it melt?
• Question #faa1a
• Melting point is the temperature at which matter changes to what?
• What is the process by which a solid, such as iodine, changes directly to a gas?
• What is the melting point of pure ice at normal pressure?
• How would you describe what occurs as ice melts?
• What is the #"critical point"# of a given substance?
• Question #80fa7
• When the particles throughout a liquid have enough energy to vaporize, what occurs?
• In most pure substances, melting occurs at a specific temperature called the what?
• In most pure substances, melting occurs at what specific temperature?
• Why do most organic compounds have low boiling and low melting point?
• What is the loss of water during the cooking process an example of?
• What are the disadvantages to using salt/sand mixture on the road?
• If you did not add sugar, would the ice cream freeze faster or slower? Why?
• Question #a9064
• Question #029c2
• What are the phase change processes taking place at equilibrium between liquid and gas phases?
• Question #8c2bf
• Why does water expand when frozen?
• What is the process of changing a liquid to a gas?
• What happens as water freezes?
• When is a gas most likely to change to the liquid phase in terms of pressure?
• What could cause a gaseous substance to liquify?
• What will happen to the number of effective collisions as temperature or concentration increase? Why?
• What is the physical process by which vapor becomes liquid or solid?
• What is the opposite of evaporation?
• What happens to ice cubes if the latent heat of vaporization is removed?