Podcast
Questions and Answers
Matter is classified as a
Matter is classified as a
- homogeneous mixture or as a heterogeneous mixture
- substance or as a mixture of substances (correct)
- homogeneous mixture, only
- substance, only
Tetrachloromethane, CCl4, is classified as a
Tetrachloromethane, CCl4, is classified as a
- compound because the atoms of the elements are combined in a proportion that varies
- compound because the atoms of the elements are combined in a fixed proportion (correct)
- mixture because the atoms of the elements are combined in a fixed proportion
- mixture because the atoms of the elements are combined in a proportion that varies
Which substance can be decomposed by chemical means?
Which substance can be decomposed by chemical means?
- tungsten
- krypton
- methane (correct)
- antimony
Which statement describes a chemical property of the element magnesium?
Which statement describes a chemical property of the element magnesium?
Solid ZnCl2 and liquid ZnCl2 have different
Solid ZnCl2 and liquid ZnCl2 have different
Given the balanced equation representing a reaction: CH4(g) + 2O2(g) -> 2H2O(g) + CO2(g) + heat, which statement is true about energy in this reaction?
Given the balanced equation representing a reaction: CH4(g) + 2O2(g) -> 2H2O(g) + CO2(g) + heat, which statement is true about energy in this reaction?
In which sample is the average kinetic energy of the particles greatest?
In which sample is the average kinetic energy of the particles greatest?
Which kelvin temperature is equal to 56C?
Which kelvin temperature is equal to 56C?
An aqueous solution of sodium chloride is best classified as a
An aqueous solution of sodium chloride is best classified as a
A bottle of rubbing alcohol contained both 2-propanol and water. These liquids can be separated by the process of distillation because the 2-propanol and water
A bottle of rubbing alcohol contained both 2-propanol and water. These liquids can be separated by the process of distillation because the 2-propanol and water
A student observed the following reaction: AlCl3(aq) + 3NaOH(aq) -> Al(OH)3(s) + NaCl(aq). After products were filtered, which substance remained on the filter paper?
A student observed the following reaction: AlCl3(aq) + 3NaOH(aq) -> Al(OH)3(s) + NaCl(aq). After products were filtered, which substance remained on the filter paper?
Which phase change is endothermic?
Which phase change is endothermic?
What is the total number of joules of heat energy absorbed when the temperature of 200.0 grams of water is raised from 10.0C to 40.0C?
What is the total number of joules of heat energy absorbed when the temperature of 200.0 grams of water is raised from 10.0C to 40.0C?
How many kilojoules of heat are needed to raise the temperature of 500 grams of water from 10.0C to 30.0C?
How many kilojoules of heat are needed to raise the temperature of 500 grams of water from 10.0C to 30.0C?
Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when
Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when
At STP, which element has a definite shape and volume?
At STP, which element has a definite shape and volume?
Which 5.0-millimeter sample of NH3 will take the shape of and completely fill a closed 100.0-millimeter container?
Which 5.0-millimeter sample of NH3 will take the shape of and completely fill a closed 100.0-millimeter container?
How many joules of heat energy are needed to completely melt 25.0 grams of ice to water at 0C?
How many joules of heat energy are needed to completely melt 25.0 grams of ice to water at 0C?
The phase change represented by the equation I2(s) -> I2(g) is called
The phase change represented by the equation I2(s) -> I2(g) is called
Flashcards are hidden until you start studying
Study Notes
Classification of Matter
- Matter can be classified as either a substance or a mixture of substances.
- Homogeneous mixtures have uniform composition, whereas heterogeneous mixtures do not.
Tetrachloromethane
- Tetrachloromethane (CCl4) is a compound with fixed proportions of elements.
Decomposition by Chemical Means
- Methane is a substance that can be decomposed through chemical reactions.
Chemical Properties of Magnesium
- A notable chemical property of magnesium is its reaction with acids.
Physical Properties of ZnCl2
- Solid and liquid forms of zinc chloride (ZnCl2) exhibit different physical properties.
Energy in Chemical Reactions
- The combustion reaction of methane is exothermic, meaning it releases heat during the process.
Average Kinetic Energy
- The average kinetic energy of particles is highest in 10 mL of liquid water at 35°C compared to other samples.
Temperature Conversion
- 56°C is equivalent to 329 K in Kelvin.
Aqueous Solutions
- An aqueous solution of sodium chloride (NaCl) is classified as a homogeneous mixture due to its uniform composition.
Distillation Process
- 2-propanol and water can be separated through distillation as they are mixed physically and maintain distinct boiling points.
Filtration of Reactions
- In the reaction of AlCl3 with NaOH, aluminum hydroxide (Al(OH)3) remains as a solid on the filter paper after filtration.
Endothermic Phase Change
- The phase change of carbon dioxide from solid to gas (sublimation) is an endothermic process.
Heat Energy Calculations
- Raising the temperature of 200 grams of water from 10°C to 40°C requires 25,080 joules of heat energy.
- To raise the temperature of 500 grams of water from 10°C to 30°C, 41.8 kJ of heat energy is needed.
Spontaneous Heat Flow
- Heat flows spontaneously from solid X to solid Y when X is at a lower temperature than Y; e.g., from 10°C to 5°C.
Shape and Volume at STP
- At standard temperature and pressure (STP), silver (Ag) has a definite shape and volume, characteristic of solids.
Behavior of Gases
- Ammonia gas (NH3) takes the shape of and fills the closed container completely as it is in the gaseous state.
Heat Required for Phase Changes
- To completely melt 25.0 grams of ice at 0°C to water requires 8,350 joules of heat energy.
Sublimation
- The phase change described by the equation I2(s) → I2(g) is known as sublimation, where a solid transitions directly to a gas.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
