Question

1. sep use models based on observations of your model, which option is the best definition of compound?

a. a compound is made up of more than one atom of the same type.
b. a compound is made up of only one atom.
c. a compound is made up of two or more types of atoms.
what evidence did you use to choose your definition?
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1. theme patterns based on your observations, compare and contrast elements and compounds in terms of atoms and molecules.

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1. compare and contrast look at the chemical formulas for the different molecules. based on your observations, compare and contrast elements and compounds in terms of their chemical symbols and chemical formulas.

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matter and solutions: elements and compounds
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Explanation:

Question 2

• Option a describes an element (same - type atoms), option b is incorrect (compounds have multiple atoms), option c matches the definition of a compound (two or more types of atoms). Evidence: Models or knowledge of chemical structure (e.g., \(H_2O\) has H and O atoms).

• Similarities: Both elements and compounds are made of atoms. Molecules can be formed by both (e.g., \(O_2\) for element, \(H_2O\) for compound).
• Differences: Elements have atoms of one type; compounds have atoms of two or more types. Element molecules have same - type atoms; compound molecules have different - type atoms.

• Similarities: Both use chemical symbols (e.g., O for oxygen, O in \(H_2O\)).
• Differences: Element symbols represent one type (e.g., Na), compound formulas have multiple symbols (e.g., \(NaCl\)). Element formulas (for molecules) repeat one symbol (\(O_2\)), compound formulas combine different symbols.

Answer:

c. A compound is made up of two or more types of atoms.

Question 3