9. A student shared with the class the four following models and said that ALL of them were mixtures. Do you agree with this student's statement? Explain why or why not.
The four models are:
1. A bottle of water with a handful of sand mixed in
2. A bowl of fruit salad
3. A container of saltwater
4. A jar of marbles
Based on the definition of a mixture, which is a combination of two or more substances that are physically mixed together but not chemically bonded, we can evaluate each of these models:
1. The bottle of water with sand mixed in is indeed a mixture because the sand and water are physically mixed together but can be separated by filtration.
2. The bowl of fruit salad is also a mixture as it consists of different fruits that are physically mixed together but can be separated easily.
3. The container of saltwater is also a mixture because salt is dissolved in water, creating a homogeneous solution that can be separated through evaporation.
4. The jar of marbles, however, is not a mixture. Marbles are solid objects that are not physically mixed with anything else in the jar. They are just sitting together in the container but not mixed in any way.
Therefore, three out of the four models provided by the student can be considered mixtures, but the jar of marbles does not fit the definition of a mixture. So, the student's statement that all of the models are mixtures is not entirely accurate.