Ch6 Part I: Atoms/Elements/Compounds
Multiple choice: Choose one best answer
1.
a.
b.
c.
d.
The center of the atom contains protons and___________.
neutrons that are positively charged
neutrons that have no charge
electrons that are negatively charged
electrons that are positively charged
2.
a.
b.
c.
d.
Which statement best describes the behavior of electrons?
electrons have no charge
electrons change energy levels often
electrons move in set paths around the nucleus
all of these
3. Negatively charged particles found in the outer most energy level of an atom
are…
a. orbitals
b. protons
c. valence electrons
d. neutral particles
4.
a.
b.
c.
d.
A substance made up of just one kind of atoms
elements
compounds
molecules
none of these
5.
a.
b.
c.
d.
Two or more different atoms may join together to form…
protons
elements
molecules
large atoms
6.
a.
b.
c.
d.
The overall charge of an atom is….
electrically positive
neutral
negative
unbalanced
7.
a.
b.
c.
d.
Which particle gives an atom it’s identity?
number of electrons
number of neutrons
number of protons
atomic mass
8.
a.
b.
c.
d.
What charge does an electron have?
positive
no charge
negative
they change
9.
a.
b.
c.
d.
Which of the following statements is true…
the number of protons equals the number of valence electrons
the number of electrons equals the number of protons
the number of neutrons always equals the number of electrons
the number of protons always equals the number of neutrons
10. Electrons travel in….
a. orbits
b. different energy levels
c. energy shells
d. all the above
11. How many electrons occupy the lowest energy level?
a. 2
b. 32
c. 8
d. 18
12. Why are atoms electrically neutral?
a. Because neutrons have no charge only
b. The number of protons equals the number of neutrons
c. The number of neutrons equals electrons
d. The number of electrons equals the number of protons
13. If an atom has all of its energy shells occupied by the maximum number of
available electrons we say the atom is…
a. neutral
b. reactive
c. diatomic
d. stable
14. If an atom contains 8 electrons in its valence shell, we say the atom is…
a. neutral
b. reactive
c. non-reactive
d. un-stable
15. Which statement occurs if you change the number protons in an element
a. nothing
b. the element totally changes into a different element
c. the atom does not change just some of its behavior
d. the number of neutrons will change
16. Which of the following occurs if you change the number of neutrons in an atom
a. nothing
b. the atom totally changes
c. the number of electrons will change
d. the atom forms an isotope
17. The periodic chart is a chart of…
a. elements
b. compounds
c. molecules
d. metal isotopes
18. The difference between carbon-12 and carbon 14 is…
a. its number of electrons
b. its number of protons
c. its number of neutrons
d. its atomic number
19. The atomic number of an atom tells us…
a. the number of neutrons
b. the number of protons
c. the mass of the atom
d. all the above
24. Consider the two following atoms 12X and
a. all of their particles are equal
b. they are isotopes of each other
c. they have different number of protons
d. they have different number of electrons
14
X …Which statement is accurate?
25.Which statement about isotopes is correct?
a. they are the same elements
b. they have different number of neutrons
c. their protons are the same
d. all the above
26. If an atom gains or loses an electron, it forms….
a. an ion
b. cations only
c. anions only
d. covalence
True/false:
27. Atomic structure refers to the building of compounds
28. The nucleus is the center of the atom
29. Protons are positively charged particles
30. Isotopes are the atoms of the same element with different neutrons
31. Chemical symbols are abbreviations for electrons
32. Covalent bonds are stronger than ionic bonds
33. Stability of an atom with 8 valence electrons is called the octet rule
34. Atoms can share electrons to form ionic bonds
35. Proteins are not affected by extreme heat
36. Enzymes can make any reaction occur faster
37. Enzymes help products overcome the activation energy barrier
38. When products are in a lower energy state than the reactants, energy was absorbed.
39. Catalase is an enzyme that breaks down water
40. Van der Walls forces are stronger that ionic bonds
41. Proteins are made up of amino acids
42. There are 20 different amino acids in the human body
43. Enzymes are specific and are named after the reaction they influence
44. Living organisms do not need enzymes…reactions will eventually supply products
45. Hydrolase breaks down water