과학

Preparation of Ammonia Gas

The preparation of ammonia gas involves reacting ammonium chloride (NH₄Cl) with sodium hydroxide (NaOH) in a process called ammonium chloride and sodium hydroxide solution in a two-necked flask. The resulting reaction produces ammonia gas, which can be collected by upward displacement of air or through other appropriate methods.

Distillation Experiment

In a distillation experiment, a liquid mixture is heated to create vapor, and then the vapor is condensed back into liquid form. This process separates components based on their differing boiling points, allowing for the isolation and purification of substances within the mixture.

자극 반응속도

In an experiment measuring human response, participants might be asked to click a designated button in response to a visual stimulus and click another button when they hear a specific sound, allowing researchers to assess reaction times and cognitive processing in different sensory modalities.

Earthquake and Types of Buildings

Earthquakes are natural disasters caused by the sudden release of energy in the Earth’s crust, resulting in ground shaking. Different types of buildings, like earthquake-resistant structures, can withstand seismic forces better due to their design and materials, reducing the risk of collapse and damage during a quake.

화학반응

The rate of a chemical reaction refers to the speed at which reactants transform into products, typically measured in terms of how quickly a specific quantity of reactant disappears or product forms. Factors such as temperature, concentration, and the presence of catalysts can influence and control the rate of a chemical reaction.

태양계 관찰

The solar system is a vast celestial system comprising the Sun, planets, moons, asteroids, and comets, all bound together by gravity. Earth is one of the eight recognized planets orbiting the Sun, and the solar system provides a fascinating insight into the vast expanse of the universe.

물의 가열곡선

As the water heats, its temperature will gradually increase. Observe the thermometer and stopwatch. When the water reaches its boiling point (100°C at standard atmospheric pressure), it will start to boil vigorously, and steam will escape from the surface. Simultaneously, stop the stopwatch to record the time it took to reach the boiling point. This […]

Molecular Diffusion Experiment

In a phenolphthalein and ammonia diffusion experiment using cotton, a solution containing phenolphthalein, a pH indicator, and ammonia is placed on a piece of cotton. As ammonia diffuses through the cotton fibers, it causes the phenolphthalein to turn from colorless to pink or purple, demonstrating the movement of the alkaline substance through the fabric. This […]

Volcano Experiment (Soda and Sugar)

The Na2CO3 and sugar volcano experiment simulates a volcanic eruption by mixing sodium carbonate (Na2CO3) with sugar. When heated, the sugar decomposes, producing carbon dioxide gas, while the Na2CO3 acts as a catalyst, enhancing the reaction, creating a frothy “lava” that erupts, providing an engaging demonstration in chemistry and geology lessons.

아세톤 증발

In an evaporation experiment using acetone and filter paper, acetone is applied to the filter paper, and the solvent rapidly evaporates, leaving behind any dissolved substances. This process is commonly used in laboratories for quick separation and purification of compounds from a solution.

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