## CHM 1

 How is the Periodic Table of Elements (PTOE) arranged?
 The PTOE shows all of the known elements arranged by increasing atomic number
 The smallest particle of an element:
 is an individual atom
 Diatomic molecules and examples:
 Elements tha exist as two atoms joined together Examples: Br2, I2, N2, Cl2, H2, O2, F2 (All are gases except Br2 is a liquid)
 Matter
 Anything that has mass and takes up space. (includes air!)
 Pure substance
 Has only one type of particle
 2 types of pure substances
 1. Element: has only 1 type of atom (Silver (Ag); Oxygen O2 2. Compound has different types of atoms joined together (H20, NaCl)
 Temperature
 measure of the average kinetic energy of the particles in a sample of matter
 Units of Temperature
 ° C or K Celsius to Kelvin
 Formula to convert Celsius to Kelvin (°C to K)
 K = °C + 273
 Volume
 Amount of space occupied by a substance
 what units can volume be measured in?
 L=liters, mL=milliliters, or cm3=cubic centimeters
 Density
 Mass per unit of volume D= mass/volume=g/mL
 Molar mass (MM)
 Represents the mass of 1 mole of a substance(for single elements the MM=the atomic mass) Units=g/mol
 1 mole =
 6.02 X 1023 particles/atoms (Avogadro’s number)
 What is the density of an object with a mass of 2.34 and a volume of 7.3 mL?
 D = m/v ; ; = 2.34 g / 7.3 mL ; ; = 2.34 ;;0.32 g/mL ; ; = 0.32g/mL ;
 What group contains the noble gases?
 Group 18
 What group contains the Alkali Metals?
 Group 1
 What Group contains Alkaline Earth Metals?
 Group 2
 What group contains the Halogens?
 Group 17
 List the 3 main classifications of elements
 metals, non-metals, and metalloids
 What element is in group 13, period 3
 Al
 What element is in group 2, period 4?
 Ca
 Identify the group and the period for the element S (Sulfur)
 Group 16, period 3
 What element has the atomic number 12?
 Mg
 What is the molar mass for the element Cl?
 35 g/mol
 What is the molar mass for H2O?
 H: ;2 x 1g/mol= 2g/mol O: ;1 x 16 g/mol = 16 g/mol ; So the MM = 18 g/mol
 How many atoms are found in calcium phosphate Ca3(PO4)2;
 13
 What is the molar mass of CH3CH2CH3
 H: ;8 x 1 = 8 g/mol C: ; 3 x 12 = 26 g/mol Let us write you a custom essay sample on CHM 1 For Only \$13.90/page ORDER NOW ; MM = 32 g/mol
 List how many of each atom in the compound Al(NO3)3
 Al – 1 N – 3 O – 9 ;
 [image]
 How can you identify the IV and the DV from a title?
 The effect of the IV on the DV ; Ex. ;The effect of increasing temperature on the solubility of sugar; IV; temperature (what you will change) DV: solubility of sugar (measure how much dissolved)
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