1. Jana uses marbles of different colors and sizes to represent atoms from different elements. How can she best model how compounds form in nature?
B. Combine marbles of different colors to represent elements bonding to form a compound.
2. Marco examines an unknown milky liquid that looks evenly mixed. When he filters it, small solid bits remain in the filter paper. What evidence shows the substance is not pure?
C. The filter left behind small solid pieces.
3.Kyla tests four solutions using litmus paper. When she accidentally spills one solution, the red paper turns blue. What can Kyla conclude about the spilled solution?
C. It is basic.
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