5 Written questions
5 Matching questions
- Difference between an element and a compound?
- What are trace elements?
- What are our 6 Essential Elements?
- What is a compound?
- What are the two strong chemical bonds?
- 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 a substance consisting of two or more different elements combined in a fixed ratio.
- c Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- d Covalent bonds (STRONGEST) and Ionic bonds.
- e CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
5 Multiple choice questions
- Positive ion = CATION
Negative ion = ANION
- Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
- First shell - 2
Second shell - 8
Third shell - 8
- Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
- The number of protons and neutrons in nucleus.
5 True/False questions
What are polar covalent bonds? → The sharing of electrons UNEQUALLY; atoms have differing electronegativities
What bond do two oxygen's share? → Non-polar covalent bond; they have equal electronegativity so they share their e⁻
What is an ion? → A substance that cannot be broken down to other substances by chemical reactions.
What are ionic bonds? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
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.