Exam Questions and Verified Answers
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1. the smallest unit of an element that still holds the properties of the element. Made up
of protons, neutrons, and electrons
Answer: atom
2. positively charged, located in the nucleus of the atom, has a mass of 1AMU-
Answer: proton
3. neutral charge, located in the nucleus of the atom, has a mass of 1 AMU
Answer: neutron
4. has a negative charge, orbits outside of the nucleus, has a mass of 1/1836 AMU
Answer: electron
5. same number of protons and electrons
Answer: balanced atom
6. atom with an unbalanced charge--either positive or negative.
, Answer: ion
7. an atom with a different number of neutrons than the standard amount for that
element.
Answer: isotope
8. the amount of matter that makes up an atom. Estimate in AMUs by adding up the
protons and neutrons.
Answer: atomic mass
9. The number of protons an atom has. This defines the type of element.
Answer: atomic number
10. the time it takes for half of the atoms of a particular substance to disinte- grate.
Answer: half-life
11. Method of measuring the ratio of Carbon 14 to Carbon 12. The longer something
has been dead, the "more" carbon 12 it has. Only accurate on items
<50,000 years old.
Answer: carbon dating
12. Elements are arranged in rows according to their atomic number, and columns
loosely according to their chemical properties.
Answer: periodic table of elements
13. a substance of 2 or more elements (ex. H20--water, CO2--carbon dioxide, NaCL--
,table salt)
Answer: compound
14. bonds a metal with a non-metal. One atom loses an electron to form a positive ion,
and the other gains an electron to form a negative ion; creating an electrostatic force
that holds them together.
Answer: ionic bond
15. a bond formed when atoms share 1 or more of their valence electrons.
Answer: covalent bond
16. the chemical composition of a substance is altered.
hint fire is an example of a chemical change taking place.
Answer: chemical change
17. something that starts a chemical change (ex. a spark)
Answer: catalyst
, 18. material that can be separated by physical means into two or more sub- stances
Answer: mixture
19. homogenus mixture in which one substance is completely dissolved into another
substance (ex. salt water)
Answer: solution
20. a mixture in which small particles are kept dispersed by agitation or molec- ular
motion in a surrounding medium (ex. muddy river water)
Answer: suspension
21. a change from one state to another without a change in the chemical com- position of
a substance
Answer: physical change
22. changes the volume of a substance
Answer: compression
23. solid, liquid, gas, plasma
Answer: states of matter
24. cannot be compressed; does not take the shape of its container
Answer: solid
25. cannot be compressed; does take on the shape of its container
Answer: liquid