Questions and Answers
Matter is classified as a
Tetrachloromethane, CCl4, is classified as a
Which substance can be decomposed by chemical means?
Which statement describes a chemical property of the element magnesium?
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Solid ZnCl2 and liquid ZnCl2 have different
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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?
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In which sample is the average kinetic energy of the particles greatest?
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Which kelvin temperature is equal to 56C?
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An aqueous solution of sodium chloride is best classified as a
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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
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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?
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Which phase change is endothermic?
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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?
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How many kilojoules of heat are needed to raise the temperature of 500 grams of water from 10.0C to 30.0C?
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Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when
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At STP, which element has a definite shape and volume?
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Which 5.0-millimeter sample of NH3 will take the shape of and completely fill a closed 100.0-millimeter container?
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How many joules of heat energy are needed to completely melt 25.0 grams of ice to water at 0C?
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The phase change represented by the equation I2(s) -> I2(g) is called
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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.
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