Question

answer the following questions to check your understanding of the lesson. use the model to answer questions 3 and 4. 3. which of the following can be observed from the model of water? circle all that apply. a. water is a molecule. b. water is a compound. c. water is made up of three types of atoms. 4. another way to model water is with letters and lines like this h - o - h. what is one way that these two models are different? a. they show different types and numbers of atoms. b. the atoms are connected in a different order. c. the forces holding the atoms together are represented differently. d. one model clearly shows a repeating pattern. use the models to answer questions 5 and 6. 5. look carefully at the models of white phosphorus and red phosphorus. circle the correct terms to complete each statement. the balls represent. the sticks represent. the two substances they represent have different. this means each has different properties. 6. based on the models of these structures, white phosphorus is a(n). red phosphorus is a(n). both are examples of a(n). 7. the structure of carbon tetrachloride, ccl₄, is similar to the structure of carbon tetrabromide, cbr₄. both molecules have four atoms connected to a central carbon atom. does that mean the two substances have the same properties? choose the best explanation. a. yes, because molecules with similar structures must have the same properties. b. yes, because the carbon atom determines the properties of both substances. c. no, because the types of atoms in a molecule and its structure both influence the properties of a substance.

Explanation:

1. Water is a molecule and compound made of 2 types of atoms (H and O). A and B are correct.
2. Different models represent atoms and connections differently. C is correct.
3. Balls - atoms, sticks - bonds, substances have different structures and properties.
4. White P - molecule, Red P - extended structure, both are elements.
5. Atom types and structure influence properties. C is correct.

Answer:

1. A. Water is a molecule, B. Water is a compound
2. C. The forces holding the atoms together are represented differently
3. Atoms; Bonds; Structures
4. Molecule; Extended structure; Element
5. C. No, because the types of atoms in a molecule and its structure both influence the properties of a substance