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8th Grade Review 1 Flashcards | StudBud
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8th Grade Review 1
Electrons...
Neutrons...
8th Grade Review 1
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1
Neutrons...
are located in the nucleus.
have virtually no mass.
are responsible for an elements reactivity.
2
Electrons...
have no charge.
have a negative charge.
have a positive charge.
3
Generally, our entire class observed the density of pennies...
increased over time.
decreased over time.
4
Collaboration leads to more reliable scientific knowledge.
True
False
5
Critical testing means trying to prove scientific ideas.
True
False
6
Some scientific ideas are better than others.
True
False
7
Electrons are
positively charged
particles with virtually no mass.
electrically neutral.
a heavy subatomic particle.
8
Electrons are responsible for...
the atomic number of an element.
my confusion.
the atomic mass of an element.
an element's reactivity.
9
What is matter?
Nothing
Empty space
Stuff
Anything that has mass and takes up space
10
A scientific fact is absolute, fixed, permanent; it never changes.
False
True
11
Science deals only with natural patterns and explanations and sometimes the supernatural.
False
True
12
Atomic number is related to which subatomic particle?
Electrons
Neutrons
Protons
13
Density...
is more descriptive than measurable.
makes it tough to separate two mixed substances.
is unique to the elements that make a substance.
14
List these from smallest to largest.
proton, atom, molecule
proton, molecule, atom
molecule, atom, neutron
electron, molecule, atom
15
J.J. Thompson developed the plum pudding model of an atom. What was he missing?
The charges were all wrong.
A nucleus with protons and neutrons.
Common sense.
Atoms are made of smaller parts.
16
Protons are...
heavy relative to other subatomic particles.
light compared to other subatomic particles.
negatively charged.
located outside of the nucleus.
17
Atoms are made of...
protons, neutrons & electrons.
chemical compounds.
elements.
protons and electrons
18
Electrons...
are really close to the nucleus.
are located in electron clouds around the nucleus.
are located in the nucleus.
19
Since the early Greeks (400BCE) we have constantly been advancing our knowledge of the atom.
False
True
20
Mass is...
anything that takes up space.
measured in milliliters.
an amount of matter.
a qualitative observation.
21
Atoms are...
always negatively charged.
the basic building blocks of matter.
tiny invincible orbs.
visible with an optical microscope.
22
Density...
is mass divided by volume.
never changes.
is volume divided by mass.
23
Ignorance is a key driving force of science.
True
False
24
Anything done scientifically is always accurate and reliable.
True
False
25
The history of atomic theory is an excellent example of which key concept of science?
There is no one scientific method
Scientific knowledge is different from other knowledge
Scientific knowledge is always open to change
Good science is different from poor science or pseudoscience
