Many tasks in chemistry involve separating mixtures. for example, crude oil by itself has very few uses, but many important substances are separated from crude oil. in this investigation we will attempt to separate sand from salt water, and salt from water. if you do not have access to sand, you can use small pebbles or bbs.

these supplies are needed: salt, water, sand, a measuring cup, a balance, filter paper

1. measure 5 grams of salt and 10 grams of sand using the balance.

2. mix together the salt and sand.

3. add the salt and sand mixture to one half-cup of water.

4. stir the mixture.

5. filter the mixture.

6. dry the sand on the filter paper.

summarize your findings in a scientific report. include your hypothesis, observations, data, and conclusions. be sure to answer the questions below in your summary as well as including your findings.

where is the salt after you filter?

where is the sand?

how could you separate the salt and water?

what other mixtures could be separated in this way?

what did you find out from this investigation? be thoughtful in your answer.

Many reactions take place in aqueous solution. when potential reactants are mixed, a reaction will occur if there is some driving force that favors the formation of products. it is often convenient to categorize reactions in terms of these driving forces: precipitate formation, in which an insoluble solid is formed, weak electrolyte formation, as in a neutralization reaction involving water, or transfer of electrons, as in a redox reaction. these reactions can be represented by full molecular equations, which contain all species in the reaction mixture, or by net ionic equations, which show only the species that actually undergo a change. the latter does not contain the spectator ions, which do not undergo a net change or do not take part in the reaction. part a when the following two solutions are mixed: k2co3(aq)+fe(no3)3(aq) the mixture contains the ions listed below. sort these species into spectator ions and ions that react. drag the appropriate items to their respective bins. view available hint(s) spectator ions ions that react part b what is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? assume that the contribution of protons from h2so4 is near 100 %.ba(oh)2(aq)+h2so4(aq)→ express your answer as a chemical equation. view available hint(s) nothing provide feedback

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

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