Physical Science 8th grade (1).pdf

2 build the following molecules as you build your

Info icon This preview shows pages 182–184. Sign up to view the full content.

View Full Document Right Arrow Icon
2. Build the following molecules. As you build your molecules, try to make sure each atom is as far from other atoms as possible. If a molecule has three hydrogen atoms on it, don’t put all three next to each other. Space them evenly around the central atom. 3. Build the following molecules. Applying your knowledge a. Once you’ve built your models, sketch them on paper. b. If a bond is a pair of electrons shared between two atoms, how many electrons are being shared in H 2 ? c. If a bond is a pair of electrons shared between two atoms, how many electrons are being shared in O 2 ? d. Electrons are negatively charged. Charges of the same kind repel. Bonds are shared pairs of electrons. How does this explain that atoms are evenly spaced around each other in molecules? e. There were two different ways (at least) to draw the molecule C 2 H 6 O . When the same formula can produce different molecules, those molecules are called isomers. Do you think the isomers of C 2 H 6 O have the same characteristics or different characteristics? Explain. f. Write the formula for the molecule in the diagram: How many toothpicks and gumdrops (and what color!) would you need to build this molecule? H 2 O 2 N 2 H 2 O CH 4 HCN CO 2 C 2 H 6 O (two different versions) Chapter 8 Activity
Image of page 182

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
C HAPTER 8 M OLECULES AND C OMPOUNDS 175 Chapter 8 Assessment Vocabulary Select the correct term to complete the sentences. Section 8.1 1. When two atoms share or trade electrons a(n) ____ is formed. 2. An atom that has acquired a positive or negative charge is called a(n) ____. 3. To represent the number and type of each element in a molecule, chemists write a ____. 4. A substance whose smallest particles include more than one element chemically bonded together is a ____. 5. The type of chemical bond formed when atoms share electrons is the ____ bond. 6. A substance made of two or more elements or compounds not chemically bonded to each other is a(n) ____. 7. A bond formed when an electron is transferred from one atom to another is a(n) ____. 8. A group of atoms held together by covalent bonds in a specific ratio form a(n) ____. Section 8.2 9. Electrons in the highest unfilled energy level of an atom, that may participate in chemical bonds are called ____. 10. The number which indicates the charge on an atom when an electron is lost, gained or, shared is called the ____. Concepts Section 8.1 1. What is the chemical formula for water? What atoms make up this compound? 2. What is the difference between a compound and a mixture? 3. List 3 examples of a mixture and 3 examples of a compound. 4. Why do atoms form compounds instead of existing as single atoms? 5. What type of bond holds a water molecule together? 6. What do we call the particle that is a group of atoms held together by covalent bonds? 7. List 4 examples of a molecule. 8. What does the subscript “2” in H 2 0 mean?
Image of page 183
Image of page 184
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern