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Home , Properties of water

Name ______Write the Can You Explain question here: Period ______How are elements, compounds, and all related to one another?

Discovery Techbook - Unit: and Properties of / Concept: Molecules

****NOTE: Watch ALL embedded video clips and images as you progress through each page of the concept.****

***ENGAGE- Answer all questions in COMPLETE SENTENCES where appropriate. Watch all video clips and images.

1. Complete the Molecules and Compounds interactive on the Engage page then answer the questions below.

a. Which four elements chemically bond to form baking soda?

Sodium, , and all chemically bond to form baking soda.

b. Which three elements chemically combine to make sugar?

Carbon, Hydrogen and Oxygen chemically combine to make sugar.

***EXPLORE p1- Answer all questions in COMPLETE SENTENCES where appropriate. Watch all video clips and images.

1. Define , and Chemical

Atom- Definition- the smallest unit of an element that has the Illustration of a Molecule- Illustrate a molecule of by viewing the “Animation” in the Interactive properties of that element. Glossary. Label the individual that bond to Molecule- Definition- two or more atoms joined together. make a molecule of water.

Chemical- Definition- an element or compound.

Chemical Bond- Definition- the forces that hold atoms together, these may be ionic, covalent or metallic.

2. Write the for:

Water- H2O - CO2 Vitamin C- C6H8O6

3. List some of the properties of water and some of the properties of the two elements that chemically bond to form water.

Properties of Water- at room / / / reacts slowly with other substances

Properties of Hydrogen- flammable / at / reactive with other substances / low density

Properties of Oxygen- non-flammable / gas at room temperature / reactive with other substances / low density

4. Explain how the properties of Water are different from the properties of the Hydrogen and Oxygen atoms that chemically combine to form Water.

Water is a liquid at room temperature and Hydrogen and Oxygen are at room temperature. Water puts out fire whereas Hydrogen and Oxygen can make fire greater. The density of water is greater than the density of Hydrogen gas and/or Oxygen gas. ***EXPLORE p2- Answer all questions in COMPLETE SENTENCES where appropriate. Watch all video clips and images.

5. Complete the concept map below. Electrons are grouped in levels. The more electrons

Positively charged- an atom has, the more energy levels (shells) an atom will

NUCLEUS have. The outermost energy level (shell) of an atom is Atoms have a called the valence and the electrons that occupy the Negatively charged- outermost shell are called valence electrons. ELECTRONS

6. Define using the Interactive Glossary. Illustrate a covalent Hydrogen-Hydrogen covalent bond- bond between two Hydrogen atoms using the Covalent Bonding video clip.

Covalent Bond- chemical link between two atoms that share electrons.

***EXPLORE p3- Answer all questions in COMPLETE SENTENCES where appropriate. Watch all video clips and images.

7. Electrons have single negative charges. This means that if an atom loses an electron, it has a net positive charge. If an atom gains an electron, it has a net negative charge. These charged atoms are called . When one in a compound has a negative charge and the other has a positive charge, the atoms are held close together by attraction between their opposite charges. This attraction forms a bond. Since the bond is formed from opposite-charged ions, it is called an ionic bond.

8.

Two Types of Chemical Bonds.

Covalent Bonds are formed by a sharing of Ionic Bonds are formed by a transfer of

electrons between atoms. electrons between atoms.

9. Illustrate a simple molecule of and illustrate the extended structure () of .

Ammonia Structural Formula (simple molecule) (extended structure)

Ammonia- NH3