Questions and Answers
What could the composition of a metal-like substance with a mass of 366 g and a volume of 18.95 cm³ be?
Pure Gold
What is the average speed of carbon dioxide at 0°C if the average speed of nitrogen at the same temperature is 650 m/s?
520 m/s
Boiling differs from evaporation in that, boiling:
takes place at specific temperature
What scientific activity is carried out with the following experimental setup?
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Which of the following quantities/properties is an intensive property?
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If a chemical reaction in a flask gives rise to solid zinc carbonate and aqueous sodium chloride, which of the following procedures can be employed in order to isolate each individual pure product?
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What are the products of the chemical reaction between zinc carbonate and hydrochloric acid?
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Which physical state transformation is indicated by the appearance of a solid and a liquid aqueous mixture?
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Study Notes
Density of Substances
- The density of gold at room temperature is 19.32 g/cm³.
- The density of silver at room temperature is 10.5 g/cm³.
Speed of Gases
- The average speed of nitrogen at 0°C is 650 m/s.
- The average speed of carbon dioxide at 0°C is related to the average speed of nitrogen at the same temperature.
Boiling and Evaporation
- Boiling takes place at a specific temperature.
- Boiling differs from evaporation in that it occurs at a specific temperature.
Experimental Setup
- The experimental setup involves refluxing an unknown liquid.
Intensive Properties
- Electrical conductivity is an intensive property.
- Intensive properties are independent of the amount of substance.
Isolation of Products
- To isolate solid zinc carbonate and aqueous sodium chloride, filter the mixture and then crystallize the filtrate.
- Crystallization is a suitable procedure to isolate individual pure products.
Chemical Reactions
- The reaction between zinc carbonate and hydrochloric acid produces zinc chloride, water, and carbon dioxide.
- The equation for the reaction is: ZnCO₃ + 2HCl → ZnCl₂ + H₂O + CO₂.
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