Question: Emily put 20 milliliters of a mystery solution in an evaporation dish. When all the water was gone, she drew the picture of the dish you see here.  Using the crystal-shape key below, what chemical do you think was dissolved in the solution? A. Epsom salt B. Sodium thiosulfate (C. Alum) D. None of the above. Explain why you chose that answer.
Reference answer: Emily's crystals are the same shape as the alum crystals shown on the key.

Student answer: Because it look a lot like alum.

Student answer: I chose it because I looked at the key below and I saw the same shape.

Student answer: Because they are the same shape.

Student answer: Because the particles in her dish, look like the ones in the box down below labeled alum.

Student answer: Because on the key alum is a hexagon and a hexagon in the middle with lines going from each point to the point on the hexagon inside.

Student answer: I chose alum because it looks like alum and the mystery solution have the same pattern.

Student answer: Because you see the picture in the dish and it looks the same.

Student answer: I looked at the crystal shape key and it looks most like alum.

Student answer: Because they look the same.

Student answer: Well I look at the key below and I saw the same way it looked at the top.

Student answer: Because that is what it is call and we talks about that is what it is call.

Student answer: Because I thought it was the best answer.

Student answer: I looked at the pictures below and one of them looked like mystery solution looked at it said alum I picked alum.

Student answer: Because crystals look like a small amount and have lines on the side something each crystal has its own shape.

Student answer: I looked at the pictures and words and I tried to see which one matched the crystals in the circle.

Student answer: Because picture tips of crystal like the same.

Student answer: Because that is the picture Emily drew. Crystals have different shapes.

Student answer: You can see it on the pictures.

Student answer: Just a wild guess.

Student answer: Because it showed what alum looks like at the bottom.

Student answer: Because they look the same.

Student answer: Because they look like they have the same properties.

Student answer: I chose that answer, because the picture look the same.

Student answer: Because picture show the exact same thing as alum in the picture below.

Student answer: Because they look the same.

Student answer: The alum has the same pattern and it looks the same.

Student answer: I chose that answer because it looks the same like the drawing in the circle.

Student answer: Because it shows the pictures below.

Student answer: I chose that answer because when I look down the picture it look the same as the picture up there.

Student answer: Because the picture down below of Epsom salt has no lines or anything.

Student answer: Because her drawing looks the same as the one in the shape key.

Student answer: The alum in the picture below is a tall hexagon the crystal in the picture above is also a tall hexagon so it led me to the conclusion that they are the same.

Student answer: Because alum looks like the picture above.

Student answer: Because it looks like alum but more crystals.

Student answer: I chose it because on the key it looks the same as the crystal evaporating dish.

Student answer: It looks closer than the other.