Q1: Describe the physical properties of the substance that remains in the evaporating dish.
A1: The substance in the dish has these physical properties: white in colour, mushy, closer together, softer, warmer, and wetter.
Q2: Where is the water that was in the salt water solution?
A2: The water is now in the air, adding to the humidity of the room. The air has dissolved the water, forming a cloud.
Q3: What do you think the substance is that remained in the evaporating dish?
A3: I think the substance is fresh salt because it was burnt to a point where the bacteria would die. Some of the bacteria could have mixed with the water.
Q4: What could you do to identify the substance?
A4: I could test its density, solubility and mass. I could just test all physical properties.
Q5: Explain why scientists would classify cereal as a heterogeneous mixture.
A5: Cereal looks different from the top to bottom and is not evenly distributed throughout.There are different colours and sizes, which makes it look different.
Q6: After a minor traffic accident, the police noticed that a solution had spilled and run off
the roadway onto the shoulder of the road. Describe how you could recover a
sample of this solution from the dirt, rocks, and sand on the road’s shoulder.
A6: I could use tweezers to remove the rock from the mixture, then use a spoon to get the sand and dirt. You should then be left with some unabsorbed solution in the cup.
Q7: When a scientist mixed together a number of substances, light, heat, and gas were
produced. The scientist could not separate the new substance using physical
properties like solubility, density, or color. Did the scientist create a mixture, or did
she produce something else? Explain how the product she produced was alike and/or
different from the homogeneous and heterogeneous mixtures you have used.
A7: The scientist produced a compound or something else, but definitely not a mixture because a mixture can be easily separated, a solution is a bit harder, but this is much harder than a solution. This is like a homogeneous mixture I have used because light is bright and same colour from top to bottom, heat is invisible and so is gas.