Question

why? how do atoms combine to make different types of matter? look at the things in this room. they are all matter. that matter may be pure or it may be a mixture. can you tell the difference? when you look at something, it may appear to be pure. something that looks pure may not really be pure. it depends on what type of particles in object or substance is made of. in this activity we will explore how the smallest chemical units of matter determine whether something is classified as an element, a compound, or a mixture. model 1 — atoms, particles, and molecules 1. locate the circled molecule of rsq in model 1. a. find a second rsq molecule and circle it. b. how many atoms are in a molecule of rsq? 2. find and circle a molecule of tsq,r in model 1. a. how many different types of atoms are found in a molecule of tsq,r? b. how many sq atoms are in a molecule of tsq,r? 3. locate the drawing labeled sqr3 & tsq in model 1. a. how many different types of atoms are found in the sample of sqr3 & tsq? b. how many different types of molecules are found in the sample of sqr3 & tsq? 4. when two atoms are touching in the drawings of model 1, what is holding the atoms together? 5. as a group, discuss the following questions and record your answer: a. can a particle be a single atom? b. can a particle be a molecule? c. how many particles are in the drawing representing t & rsq & r in model 1? d. what is your group’s definition of the word ‘particle’ as it is used in chemistry? 6. compare the codes listed at the top of each drawing in model 1 with the shapes in that box. a. what do the letters r, sq, and t in the codes represent? b. what do the small numbers (subscripts) in the codes represent? c. when atoms are touching, how is that communicated in the code? d. what is the common characteristic of the samples in which an ampersand (&) is used? e. in model 1 there are three drawings that are labeled with a question mark. write codes to properly label these drawings.

Explanation:

Step1: Analyze molecule RSq

In a molecule of RSq, there are 2 atoms (1 R - atom and 1 Sq - atom).

Step2: Analyze molecule TSq₂R

a. In a molecule of TSq₂R, there are 3 different types of atoms (T, Sq, R).
b. There are 2 Sq atoms in a molecule of TSq₂R.

Step3: Analyze sample SqR₃ & TSq

a. In the sample SqR₃ & TSq, there are 3 different types of atoms (Sq, R, T).
b. There are 2 different types of molecules (SqR₃ and TSq).

Step4: Determine what holds atoms together

When two atoms are touching in the drawings of Model 1, a chemical bond is holding the atoms together.

Step5: Answer group - discussion questions

a. A particle can be a single atom.
b. A particle can be a molecule.
c. In the drawing representing T & RSq & R in Model 1, there are 3 particles (1 T, 1 RSq, 1 R).
d. In chemistry, a particle can be a single atom, a molecule, or a small sub - atomic entity.

Step6: Analyze codes in Model 1

a. The letters R, Sq, and T in the codes represent different types of atoms.
b. The small numbers (subscripts) in the codes represent the number of that type of atom in the molecule.
c. When atoms are touching, it is communicated in the code by being in the same chemical formula (no special symbol is shown in these simple codes for just being bonded).
d. The common characteristic of the samples in which an ampersand (&) is used is that they are mixtures of different molecules.
e. For the question - mark labeled drawings (from top - left to bottom - right): First drawing: R₈; Second drawing: T₂Sq; Third drawing: T₂R₂

Answer:

1. a. (Student needs to circle another RSq molecule in the model). b. 2
2. a. 3 b. 2
3. a. 3 b. 2
4. Chemical bond
5. a. Yes

b. Yes
c. 3
d. A single atom, a molecule, or a small sub - atomic entity

1. a. Different types of atoms

b. Number of that type of atom in the molecule
c. Being in the same chemical formula
d. Mixtures of different molecules
e. R₈; T₂Sq; T₂R₂