Question

model 1 — atoms, particles, and molecules

1. assist one group - member to cut apart model 1 to separate the nine drawings. as a team, sort the drawings into two groups - one group where all the particles in the drawing are identical, and a second group in which the drawings contain more than one type of particle.

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matter is classified as a pure substance when all of the particles are identical. matter is classified as a mixture if there are different types of particles present.

1. identify which drawings from question 7 are pure substances and which are mixtures. list the codes for the drawings in the appropriate places below.

pure substances
mixtures

1. how are the codes (chemical formulas) for pure substances different from those for mixtures?
2. as a team, take the set of pure - substances drawings from question 8 and sort them into two new groups, those containing only one type of atom and those with two or more types of atoms.

Explanation:

Step1: Recall definition of pure substances and mixtures

Pure substances have identical particles, mixtures have different - type particles.

Step2: Analyze each drawing in Model 1

Examine the particles in each drawing to check for uniformity. In drawings where all particles are the same (same shape), they are pure substances. In drawings with different - shaped particles, they are mixtures.

Step3: Answer question 8

Pure Substances: Drawings where all particles are identical (e.g., all circles in one drawing). Mixtures: Drawings with different - shaped particles (e.g., circles and triangles together).

Step4: Answer question 9

The codes (chemical formulas) for pure substances represent a single type of particle or a fixed combination of the same type of atoms. For mixtures, there is no single chemical formula as they are a combination of different substances with their own formulas.

Step5: Answer question 10

Separate the pure - substance drawings into two groups. One group for single - atom pure substances (e.g., just circles representing single atoms) and another for compounds (pure substances with two or more types of atoms bonded together, like the drawings with bonded shapes).

Answer:

1. Pure Substances: [List drawings with identical particles]; Mixtures: [List drawings with different - type particles]
2. Pure substances have single or fixed - combination formulas, mixtures have no single formula.
3. Group 1: Pure substances with one type of atom; Group 2: Pure substances with two or more types of atoms.