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Chemical Interactions Chapter 2 Review Good Luck!.

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Presentation on theme: "Chemical Interactions Chapter 2 Review Good Luck!."— Presentation transcript:

1 Chemical Interactions Chapter 2 Review Good Luck!

2 How do the properties of a compound compare with the properties of the elements that make it? They are often quite different

3 What two factors determine the properties of a compound? the types of atoms it contains and how the atoms are arranged

4 How do we represent compounds? by a chemical formula

5 NaNO 3 has how many oxygen atoms? Three

6 What is a subscript? a subscript is a number written to the right of a chemical symbol and slightly below it.

7 Write the formula for one atom of nitrogen and one atom of oxygen. NO

8 How can millions of compounds be made from the atoms of about 100 elements atoms can combine in many different ratios

9 What do you get when an atom loses or gains an electron? an ion

10 What do you call the force of attraction between positive and negative ions? an ionic bond

11 What type of bond holds a crystal together? Ionic bond

12 What is the name of MgO magnesium oxide

13 What type of bond is formed when electrons are shared? covalent

14 What type of bond forms from unequal sharing of electrons? Polar covalent

15 What is responsible for many of the properties of substances? their structure

16 What type of bond is found in individual molecules? covalent

17 What part of an atom is involved in chemical bonding? electron cloud

18 What property of the electrons in a metal gives the metal its properties? They move easily

19 Are covalent compounds good conductors of electricity when dissolved? Why or Why not? No, molecules stay together and do not conduct an electrical current.

20 How do metal atoms bond together? Metal atoms share electrons with many other metal atoms at the same time.

21 Why do ionic compounds have high melting points? Each ion in a crystal is rigidly bonded to the several ions that surround it. Because each ion is strongly bonded to other ions, much energy has to be added to break the bonds.

22 What are three forms of the element carbon? Graphite, diamond, and fullerene

23 Most substances are compounds

24 All compounds are made of atoms of two or more elements

25 The chemical formula for a compound have one barium (Ba) ion and two chloride (Cl) ions is BaCl 2

26 The 4 in the chemical formula CH 4 means there are four hydrogen atoms to one carbon atom

27 An atom becomes a positive ion when it loses an electron to another atom

28 A polar covalent bond forms when two atoms share two electrons unequally

29 Metallic bonds make many metals good conductors of electricity

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