Unit 3 (R8-9) Test Review [8th GRADE]Versión en línea
Use your Resources and this Quiz to prepare for your UNIT 3 TEST
1
___________________ is physical substance, which takes up space and has mass.
2
Which of the following is NOT one of the common states or phase of matter?
3
All matter is made up of very small ______________ and/or combinations of _______________.
4
Ancient Greek philosophers struggled with the question of matter more than 2,000 years ago. At the time, many thought that all matter is made up of only 4 elements: Earth, Fire, Water, and _________.
5
One philosopher named ____________________________ (460-370 BC) challenged the popular idea of matter and stated that all matter is made up of small solid objects, he called atomos, that cannot be divided, created, or destroyed.
6
A(n) ________________ is the smallest piece of an element that still represents that element.
7
In the late 1700's, English schoolteacher and scientist ______________________, was able to test the atomos theory of ancient Greece, and found some basic evidence to support the atomic theory.
8
In 1981, the invention of a high powered microscope called a(n) ___________________ enabled scientists to see the exterior of individual atoms for the first time.
9
The____________________ is the region at the center of an atom that contains most of the mass of the atom.
10
A proton is a(n) _____________________________ in the nucleus of an atom.
11
A(n) _________________________is an uncharged particle in the nucleus of an atom.
12
A(n) _______________________________is a negatively charged particle that occupies space in an atom outside of the nucleus.
13
The ______________ model of an atom shows electrons moving in neat specific orbits around the nucleus. This is not truly accurate, as electrons bounce all over the place.
14
A(n )_____________________________________________is the region surrounding an atom’s nucleus where one or more electrons are most likely to be found.
15
Electrons closer to the nucleus have ______________ than electrons farther away from the nucleus.
16
Which of the following would express the charge of a single electron?
17
Which of the following would express the charge of a single proton?
18
Which of the following would express the charge of a single neutron?
19
____________________ is the relative mass of an electron compared to a proton and/or neutron.
20
A(n) __________________________is a substance made from atoms that all have the same number of protons.
21
The number of protons in an atom of an element is the element’s____________________________________. It is the whole number listed with each element on the periodic table.
22
An atom of Carbon gains 1 proton and loses 1 neutron. Is it still a Carbon Atom?
23
A Carbon atom gains 1 neutron and loses 1 electron. Is it still a Carbon atom?
24
In a___________________________________, the number of electrons equals the number of protons. Thus, the number of positive charges equals the number of negative charges.
25
_______________________________are atoms of the same element that have different numbers of neutrons. Most elements have several of these.
26
The mass number of an atom can be calculated by which of the following equations:
27
__________________________________of an element is the average mass of the element’s isotopes, weighted according to the abundance of each isotope.
28
Elements that spontaneously emit radiation are considered to be ____________________________.
29
Elements that are radioactive contain unstable nuclei. ______________________________is a process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation.
30
Alpha Decay: An alpha particle is made of __________________. When an atom releases an alpha particle, its atomic number decreases by two. Uranium-238 decays to Thorium-234 through the process.
31
In beta decay, a neutron in an atom changes into a proton and ____________________ called a beta particle.
32
Gamma rays do not contain ____________, but they do contain a lot of energy.
33
All 3 types of nuclear decay begin with a(n) __________________.
34
The process of nuclear decay always results in the original atom changing into a different element.
35
A(n) ________________________________is an atom that is no longer neutral because it has gained or lost electrons. It can be positively or negatively charged, depending on whether it has lost or gained electrons.
36
An atom with a positive charge is called a ________________________________or______________________________.
37
An atom with a negative charge is called a ________________________________________or _________________________________________.
38
An atom has: 8 Protons , 8 Neutrons, and 9 Electrons. Does this atom carry an electrical charge?
39
An atom has: 8 Protons , 8 Neutrons, and 9 Electrons. What is its mass number?
40
An atom has a mass number of 19, 11 protons, and 10 electrons. How many neutrons are present in the nucleus?
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