Chemical compounds - RMC Science

Chemical compounds - RMC Science

CHEMICAL COMPOUNDS LEARNING GOALS We are learning about chemical compounds. We are learning to identify parts of chemical formulas. We are learning to identify two types of chemical compounds. CHEMICAL COMPOUNDS

Formed from elements in periodic table Formed from 2 or more elements We use them in every day life! CHEMICAL COMPOUNDS Have an official name and a chemical name Can be identified by words and symbols REACTIVITY

The closer an atom is to a full outer electron shell, the more reactive it is The atoms of group 18 are not reactive at all Noble gases Full outer electron shell TRY THIS 1. Name the least reactive group of elements. Why?

Nobel gases! Full outer shell! 2. Name the two most reactive. Why? Alkali (grp 1) and Halogens (grp 17). One electron away from noble gas! 3. Name the element in each pair that is more reactive: a) Na and Mg b) S and Cl c) K and Na d) F and Cl

CHEMICAL FORMULAS A group of letters and subscript numbers that represent the make-up of a chemical compound symbol for element hydrogen Small number here means 2

atoms of hydrogen H2O symbol for element oxygen No small

number here means 1 atom of oxygen TRY THIS ATOM COUNT 1. CaCO3 6. C6H12O6

2. Na3PO4 7. CO2 3. MgCl2 8. CCl2F2 4. NaC5H8NO4

9. CH2F2 5. H2O2 PLEASE COMPLETE 1. What does the subscript in a chemical formula tell you? 2. What does no subscript mean? 3. For the compound ammonia, NH4, how many nitrogen atoms are there, and how many hydrogen atoms are there in each

molecule? 4. Write a chemical formula for a compound that is made of one atom of carbon (C) and 4 atoms of hydrogen (H)? 5. Write the chemical formula for a compound that has two atoms of nitrogen and four atoms of oxygen. STABILITY When elements form compounds, they become more stable. All elements try to achieve a full outer electron shell that noble

gases have. STABILITY Elements achieve a full shell in one of three ways: 1. Metals lose electrons to form positive ions. 2. Non-metals gain electrons to form negative ions. 3. Non-metals share electrons. IONS

An atom or group of atoms that has an electrical charge. Can be either positive or negative. TYPES OF COMPOUNDS Two types: 1. Ionic 2. Molecular

IONIC COMPOUNDS Metal ions are positively charged Non metal ions are negatively charged Ionic compounds form because metal ions and non-metal ions are attracted to each other. IONIC PROPERTIES Solid at room temperature

Very high melting points Conduct electricity when melted or dissolved in water MOLECULAR COMPOUNDS Non-metal atoms can share electrons with other non-metal atoms Hydrogen is included here MOLECULAR PROPERTIES

Solids, liquids, or gases at room temperature Lower melting points than ionic compounds Do not conduct electricity when melted or dissolved in water IONIC OR MOLECULAR 1. NaCl CCl4

2. CH4 CaO 3. CO MgO 4. CaCl2

CuBr2 5. C12H22O11 CH3OH LEARNING GOALS We are learning about chemical compounds.

We are learning to identify parts of chemical formulas. We are learning to identify two types of chemical compounds.

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