1. Poll
20 seconds
Isotopes are atoms of elements that differ in their number of
- protons
- neutrons
- electrons
- nuclei
2. Poll
20 seconds
K is the element
- carbon
- calcium
- iron
- potassium
3. Poll
20 seconds
___ is(are) anything that has mass and occupies space
- molecules
- matter
- water
- atoms
4. Poll
20 seconds
______ proceed in both directions
- hydrogen bonds
- reversible bonds
- covalent bonds
- ionic bonds
5. Poll
20 seconds
The ability of the body to form new tissue in wound repair is a good example of _____
- decomposition
- synthesis
- exchange
- reversible
6. Drawings
450 seconds
Draw a carbon atom.
7. Poll
20 seconds
___ is the most abundant element in the universe
- oxygen
- iron
- hydrogen
- calcium
8. Poll
20 seconds
Each element is identified by its atomic number, which is the number of ______ in the nucleus
- neutrons
- protons
- electrons
- isotopes
9. Poll
20 seconds
Helium is an _____ or stable element
- inert
- reactive
- incomplete
- bonding
10. Poll
20 seconds
AB + CD -> AD +CB symbolizes a formula for:
- synthesis
- decomposition
- exchange
- reversible
11. Poll
20 seconds
Which one is a major element in the body?
- iron
- iodine
- sulfur
- carbon
12. Drawings
450 seconds
Draw a water molecule
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