Question

1. Докажите что данное вам белое порошкообразное вещество смесь поваренной соли и мела является смесью? 2. Предложите план разделения на составные части данной Вам смеси серы , железной стружки и сахара? Химия 7 класс .​

Answer 1

Ответ:

1.они имеют разную констинстенцию,вид и состоят из разных элементов

2.чтобы разделить железную струшку нужно по смеси провести магнитом, она примагнитится.

Оставшуюся смесь растворяем в воде, сахар растворится

Пропускаем воду через фильтр, сера отделится от воды

Кипятим воду и остаётся сахар

Answer 2

Identifying the White Powdery Substance as a Mixture of Table Salt and Sugar

To prove that the white powdery substance given to me is a mixture of table salt (sodium chloride) and sugar (sucrose), we can perform a simple experiment to test its properties.

1. Solubility Test: - We can start by testing the solubility of the substance in water. Table salt is highly soluble in water, while sugar is also soluble but to a lesser extent. By observing the rate and extent of dissolution, we can infer the presence of both substances in the mixture.

2. Heating Test: - Another test involves heating the substance. Table salt, being an ionic compound, does not undergo significant changes when heated, while sugar caramelizes and undergoes a noticeable color change.

3. Taste Test: - While not recommended, a taste test can also provide some clues. Table salt has a distinct salty taste, while sugar is sweet.

By conducting these tests, we can confirm whether the white powdery substance is indeed a mixture of table salt and sugar.

Plan for Separating Sulfur, Iron Shavings, and Sugar

To separate the components of the given mixture, which consists of sulfur, iron shavings, and sugar, we can use the following plan:

1. Magnetic Separation: - Iron shavings are magnetic, so we can use a magnet to separate them from the rest of the mixture.

2. Filtration: - After removing the iron shavings, we can use filtration to separate the remaining mixture into two components: sulfur and sugar. Sulfur does not dissolve in water, while sugar does. By dissolving the mixture in water and then filtering it, we can separate the insoluble sulfur from the soluble sugar solution.

3. Evaporation: - Once the sugar solution is obtained, we can recover the sugar by evaporating the water, leaving behind the solid sugar crystals.

By following this plan, we can effectively separate the sulfur, iron shavings, and sugar into their individual components.

I hope this helps with your chemistry class! If you have any more questions or need further clarification, feel free to ask.