5 Written Questions
5 Matching Questions
- Difference between an element and a compound?
- How many electrons does it take to fill the first orbital shell? The second? The third?
- What are polar covalent bonds?
- What are valence electrons?
- What is the atomic mass?
- a A compound has characteristics different from those of its elements. Table salt, for example, is sodium chloride (NaCl), a compound composed of the elements sodium (Na) and chlorine (Cl) in a 1:1 ratio. Pure sodium is a metal, and pure chlorine is a poisonous gas. When chemically combined, however, sodium and chlorine form an edible compound.
- b The electrons on the outermost orbital shell
- c The sharing of electrons UNEQUALLY; atoms have differing electronegativities
- d The number of protons and neutrons in nucleus.
- e First shell - 2
Second shell - 8
Third shell - 8
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
- Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
- 2 or more atoms held together by covalent bonds
- Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
5 True/False Questions
What is a hydrogen bond? Strong or weak? → Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
What are the two strong chemical bonds? → Atoms interacting with each other to share, take, or give electrons.
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
Do Hydrogen Bonds only occur with water molecules? → Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
What are ionic bonds? → 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