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Atoms & Elements
Atoms & Elements
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Review Atoms and Elements Unit
Flashcards
21 cards
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Practice quiz
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Questions
21
Answers
1
When dissolved into water, a molecule of potassium chloride ___________.
separates into ions of potassium and ions of chlorine
combines with the water molecules
forms a new molecule
separates into two molecules
2
Which model is the best representative of the modern understanding of atomic theory?
solar system model
electron cloud model
plum pudding model
Bohr model
3
How do we measure size at the atomic level?
micrometers
nanometers
centimeters
milllimeters
4
What is the simplest type of a pure substance?
Compound
Colloid
Element
Mixture
5
Polypropene is a polymer made for a chain of which monomer?
propane
polymer
polypropane
propene
6
The atomic weight of the atom is composed of the protons and neutrons in the___________.
outer energy level
orbits
innermost energy level
nucleus
7
The number of electrons in a neutral atom is equal to the number of__________.
neutrons
levels of energy
quarks
protons
8
An element is composed of only one type of ________.
atom
compound
atomic charge
molecule
9
The electrically neutral subatomic particle in the nucleus of an atom is the __________.
proton
neutron
nucleus
electron
10
Which of the following cannot be seen by the naked eye?
compounds
mixtures
atoms
elements
11
Where can electrons be found in an atom?
Electrons only exist when they are flowing between atoms.
Electrons are located inside the nucleus of an atom.
Electrons orbit the nucleus of an atom.
Electrons are distributed inside the nucleus of an atom.
12
Electrons are much smaller than protons and neutrons in mass and size.
False
True
13
Which of these results when a neutral atom gains an electron?
It also gains a proton.
It develops a negative charge.
It also gains a neutron.
It develops a positive charge.
14
An atom has a net charge of negative 2. If it loses two electrons, what is its net charge?
neutral
positive 1
negative 4
positive 4
15
A molecule of H
2
SO
4
contains how many atoms?
3
8
6
7
16
What is the electrical charge on a proton
ionic
neutral
negative
positive
17
Atomic number on the periodic table refers to________________.
the number of atoms in a cubic centimeter of an element
the number of protons in each atom of an element
the number of ways an element can be combined
the number of neutrons added to the number of protons
18
Which scientist discovered the existence of electrons?
Dalton
Thompson
Rutherford
Bohr
19
Many bases contain oxygen and hydrogen together as an ion. What is the name of this ion?
oxide
hydrogen
oxygen
hydroxide
20
With the atomic number 1 and an atomic mass of 1.0079, hydrogen has _________.
1 proton
1 neutron
2 energy levels
2 electrons
21
Proteins are polymers made of long strands of __________.
sugars
carbons
carbohydrates
amino acids
