It Matters!
True or False: Flammability is a physical property of matter.
False! It is a chemical property.
This type of reaction absorbs heat from its surroundings.
What is endothermic?
The state of matter that is characterized by having a definite volume but no fixed shape is
What is a liquid?
True or false: Solids have a definite (fixed) shape and volume.
True!
This type of intermolecular force is responsible for water's high boiling point and is the strongest intermolecular force.
What is the hydrogen bond?
True or false: salt water is considered a pure compound.
False! Salt water is a homogeneous solution.
True or false: Evaporation is an exothermic process.
False! The substance needs to absorb heat to evaporate, making the process endothermic.
On a phase diagram, this is the point where all three phases coexist.
What is triple point?
This type of solid structure is characterized by having a rigid, repeating pattern.
What is crystalline?
True or false: Gases have the strongest intermolecular forces compared to solids and liquids.
False! Gases have the weakest IMFs compared to liquids or solids!
The name for the phase change of dry ice turning directly into carbon dioxide gas is
What is sublimation?
Freezing/fusion is an example of an __________ reaction.
What is an exothermic reaction?
Water boils at 100 degrees Celsius at sea level. Because there is less pressure at high altitudes, and therefore less interaction between the molecules and weaker IMFs, it would take ____ energy to boil water.
What is less energy (boils at lower temp.)?
The phase change in which a gas skips the liquid state and goes straight into a solid is called
What is deposition?
This type of intermolecular force is the weakest and is caused by a temporary dispersion of charge within molecules with similar electronegativities.
What is London dispersion or Van der Waals force?
This is the biggest difference between a mixture and pure substance.
What is mixtures can be physically separated whereas pure substances cannot?
This type of graph represents how the temperature of a substance changes over time.
What is a heating/cooling curve?
This point on a phase diagram represents the maximum temperature and pressure for which a substance can exist as a liquid.
What is the critical point?
If 100 grams of solid ice is heated to the melting point, this is what happens as the energy enters the substance and it undergoes a phase change.
What is the energy will break the intermolecular bonds holding it in the solid state?
According to the law of conservation of mass, if 20 grams of hydrogen reacts with 160 grams of oxygen, this is how many grams of water will be produced.
What is 180 grams?
This type of physical separation technique is achieved by separating mixed substances based on the distance they travel throughout a medium.
What is chromatography?
This is what happens to a substance's temperature during a phase change.
What is it plateaus or stays constant?
The amount of heat needed to vaporize one mole of a liquid is known as
What is the heat of vaporization?
The amount of energy required to melt one mole of a solid is known as
What is heat of fusion?
If a compound is composed of 12 grams of carbon, 2 grams of hydrogen, and 16 grams of oxygen, then what is the percent composition of carbon in the compound?
What is 40%?