Which of these photos demonstrates a change from heating or cooling that cannot be reversed?

Observable properties classify all of the items listed. What observable property are all of the items in "Category 2" sorted by?

Bella put a dirty sock in a box. She described it to her sister using observable properties, and her sister had to guess what it is. Which set of features matches the sock?

Blair and her class build two bridges as a competition. The goal was to get the most cars across before the bridge collapsed. They have to choose the best design to improve on and send to the science fair.

Based on the data table, which bridge should they select and why?

Grace wants to see which object she should NOT choose to clean up a spill. Based on the absorbency (ability to soak up something) property of each item, which item would be the worst to select?

Jessa mixed sand and paperclips. She wants to remove the paperclips without touching them. Her teacher gives her the choice of three different tools to use. Which tool is best suited for removing paperclips without touching them?

I melted a crayon and then put the crayon in the refrigerator, and it did not form back into the crayon shape, just a hard pile of colored wax. I did this multiple times, and it always happened the same way. I think heating can be reversed. This is an argument based on evidence.

Which statement is based on opinion instead of evidence?

Becky says some changes caused by heating cannot be reversed. Maddy says all changes can be reversed. Their mother cooked hashbrowns for breakfast. Using this example, which sister is correct, Becky or Maddy, and why?

Which photo represents whole objects being broken down into smaller pieces to make something new?