Yes, they can. Sand is almost all oxides of silicon, and it won't react with water. There is no "danger" associated with filling a container with sand, adding water to cover it, then snapping on a lid. If you'd like to use a mason jar with a screw on lid, go for it. Just don't let either container freeze or allow it to get too hot, as freezing or boiling water expands and creates pressure.
Water can be evaporated from a sealed container.
No, if the container is strongly sealed and the diffusion is impossible by the walls.
You add water to the container then you stir, the water and salt would form a solution and sand would settle on the bottom of the container. You get another container and place on a filter paper then you pour the water into it, which would lead to the sand staying in the filter paper and the solution, which is made of salt and water, would be left. Finally, you place the container on a source of heat which will cause the water to evaporate and salt staying in the container. Now weigh the residue and find the percentage.
Radiator
the water in the little container rises up and then the water falls down into the soil and then goes into the plant.. and love you knickknack
Water can be evaporated from a sealed container.
The sand will simply go to the bottom of the container of water. Water and sand do not mix.
it depends on the container vessel; it is likely you can use a container/ box / vessel with small drainage holes at the base, and allow the water to soak through the sand ., leaving the sand behind.
Nothing - sand and water do not react because sand is relatively inert. The sand will sink to the bottom of the container because it is significantly heavier than the water.
From a sealed container or pipe water cannot be evaporated.
No, if the container is strongly sealed and the diffusion is impossible by the walls.
The salt will dissolve in the water, and make the water salty. The sand won't be dissolved, and the sand will sink to the bottom of the container.
You add water to the container then you stir, the water and salt would form a solution and sand would settle on the bottom of the container. You get another container and place on a filter paper then you pour the water into it, which would lead to the sand staying in the filter paper and the solution, which is made of salt and water, would be left. Finally, you place the container on a source of heat which will cause the water to evaporate and salt staying in the container. Now weigh the residue and find the percentage.
Radiator
the water in the little container rises up and then the water falls down into the soil and then goes into the plant.. and love you knickknack
Allow the mixture to stand without disturbance, until the heavier sand sinks to the bottom of the container; then skim the water from the top of the container. Also, you can boil the mixture evaporating the water into another pot or bowl thus leaving behind the sand. Filtration is another possibility.
Use water. Mix it around, the sugar will dissolve into the water. Use a siv to separate the water and the sand, put the water in a container and wait for the water to evaporate: leaving sugar and sand.