Molecule Intro Worksheet
- Due Feb 11, 2022 at 11:59pm
- Points 30
- Questions 11
- Available until Mar 17, 2022 at 11:59pm
- Time Limit None
- Allowed Attempts Unlimited
Instructions
Molecule Intro Notes
Atom: smallest unit of matter that constitutes a chemical element
Element: substance that cannot be broken down into smaller smaller substances
Molecule: group of atoms bonded together
- Element Molecule: multiple atoms of the same element bonded together
- Compound Molecule: atoms of different elements bonded together
Mixture: substance made by combining other substances
- Homogenous Mixture: mixture with same proportions of components throughout (uniform)
- Heterogenous Mixture: mixture that is not uniform throughtout
https://www.diffen.com/difference/Compound_vs_Mixture (Links to an external site.)
Types of bonds
Ionic Bond: ions bonded due to the transfer of electrons
- One atom gains electrons, the other loses electrons
- One becomes negatively charged, the other becomes positively charged
- Opposites attract, so they stick together
https://www.quora.com/What-are-ionic-covalent-and-metallic-bonds (Links to an external site.)
Covalent Bonds: atoms bonded by sharing electrons
- shared electrons create a new orbit around both atoms
https://www.quora.com/What-are-ionic-covalent-and-metallic-bonds (Links to an external site.)
Writing molecular formulas
- Determine the number of each type of atom in a compound, based on the prefix:
- "mono" = 1
- "di" = 2
- "tri" =3
- "tetra" = 4
- Example: Carbon dioxide--"di" means it has two oxygen atoms
- No prefix before "carbon" means there is 1 carbon atom
- Write the symbol for the first element
- C for Carbon
- Write how many atoms of that element as a subscript
- subscript= number written slightly below the normal line of text
- If there is only 1 atom of an element, do not write a subscript
- Example: Only one C in Carbon dioxide, so just write C
- Two Hydrogen in Dihydrogen monoxide: write "H2"
- Repeat for the next element in the compound
- Example: Carbon dioxide
- "di" means 2 oxygen
- write as O2
- combined with the first element: CO2
- Example: Dihydrogen monoxide
- "mono" means 1 (which we never write in a formula), so 1 oxygen
- H2O
- Example: Carbon dioxide
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