A student wanted to make a toy for his little sister. The toy would have colorful liquid and solid items inside and would look pretty when you shake it. He had some little plastic stars and leaves. His plan was to put the stars and leaves in a jar and fill it with liquid. When you shake the jar, everything swirls around together. Then the stars slowly float to the surface, and the leaves settle to the bottom. The student mixed up 500 mL of salt solution. He weighed it and found its mass to be 585 g. Will his shake-up toy work the way he wants it to if he uses this salt solution? Why or why not?Remember, 1 mL = 1 cm3. Show your math.
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What's the concrentration of the salt solution. What is the density of the salt solution? What is the density of the stars and leaves? Is that 585 g just the mass of the salt solution or does that include the weight of the jar? Is the salt NaCl or some other salt? I don't think the question can be answered with the information submitted. Probably the stars will float since most plastics will. If the stars float I suspect the leaves will too if they are made of the same plastic. What you need to know is the density of the plastic pieces and the density of the salt solution. If the stars and leaves have density less than the liquid they will float. If not they will sink.
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