5 Written questions
5 Matching questions
- How many electrons does it take to fill the first orbital shell? The second? The third?
- What are isotopes?
- What are trace elements?
- What is the atomic mass?
- What's a positive ion called? A negative ion?
- a Different forms of the same element; they differ in number of neutrons, but they have the same # of protons and behave identically in chemical reactions
- b Positive ion = CATION
Negative ion = ANION
- c First shell - 2
Second shell - 8
Third shell - 8
- d Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- e The number of protons and neutrons in nucleus.
5 Multiple choice questions
- The making and breaking of chemical bonds.
1. Reactants - structure of chemicals prior to a chemical reaction
3. Products - structure of chemicals as a result of a chemical reaction
- No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
- The number of protons in an atom.
- The electrons on the outermost orbital shell
5 True/False questions
Define Subatomic particles, their charges, where they're found, and their relative mass. → Protons - positive; in nucleus; 1 dalton (or amu)
Neutrons - neutral; in nucleus; 1 dalton (or amu)
Electrons - negative; found outside nucleus; 0 nothing
What is a compound? → a substance consisting of two or more different elements combined in a fixed ratio.
What is electronegativity? → One atom's attraction of the electrons within one covalently bonded molecule
O > N > C > H
Oxygen - most electronegative element
What is an element? → Atoms that lose or gain electrons to complete their outer shell
What are polar covalent bonds? → The sharing of electrons UNEQUALLY; atoms have differing electronegativities