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Science - Ch. 6-7 Flashcards | StudBud
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Science - Ch. 6-7
Science - Ch. 6-7
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1
A substance dissolves the fastest in the following conditions
grinding, increasing concentration, stirring
grinding, increasing temperature, stirring
increasing temperature, increasing concentration, stirring
2
An atom that has a positive electrical charge because of losing electrons is called an anion.
False
True
3
The symbol of potassium is K.
False
True
4
Which of the following is not a principle of the Atomic theory?
All atoms of a particular element have the same properties.
Different elements have different properties b/c their atoms are different
All atoms are made of subatomic particles.
Chemical processes are the result of the rearrangement of atoms.
5
The Pauli Exclusion Principle states that no two electrons in an atom can have the same four quantum numbers.
True
False
6
The process of combining two nuclei to form a heavier nucleus is called fusion.
True
False
7
Electrons that are shared by more than two atoms are said to be delocalized.
True
False
8
What is the only metal that is liquid at room temperature?
Potassium
calcium
Mercury
uranium
9
What idea states that it is impossible to simultaneously know both the velocity and position of an electron?
quark theory
Heisenberg Uncertainty Principle
quantum theory
Pauli Exclusion Principle
10
The symbol of oxygen is O.
False
True
11
The symbol of Silver is Au.
False
True
12
When an atomic nucleus breaks up or changes, emitting radiation it is called?
gamma decay
radioactive decay
beta dcay
13
What structure shows the locations of all atoms and outermost electrons?
spacefilling model
Lewis structure
ball-and-stick model
14
A substance that comes out of solution is said to be?
precipitate
dissolve
evaporate
melt
15
Which type of chemical bonding results from the transfer of electrons?
metallic
hydrogen
Polar
ionic
16
If the molecules of a mixture are not completely mixed together, the substance is a heterogenous mixture.
True
False
17
What do you call even smaller particles than protons and electrons in theory?
quarks
isotopes
ions
cation
18
Sodium is an alkali metal.
True
False
19
Which subatomic particle has a negative charge?
isatopes
Electron
Proton
Neutron
20
A substance with strong intermolecular forces are typically has a higher boiling point than a substance with weak force.
False
True
21
What is each row in the periodic table called?
block
group
period
periodic law
22
In the Octet rule most atoms tend to react to obtain eight electrons?
False
True
23
Ionic bonding results in electrons sharing among all atoms in the substance.
False
True
24
According to the electron-cloud model electrons move unpredictable in which region?
orbitals
electron wave
shells
orbits
25
Electrons are found outside of the atomic nucleus.
True
False
26
What are the groups 1,2, 13-18 called?
metal elements
alkali metal
non metal elements
main-group elements
27
The symbol of sodium is Na.
True
False
28
The outermost shell of electrons of any atom is called valence electrons.
True
False
29
Sodium makes up most of the human body.
True
False
30
What substances are composed of a single type of atom?
mixtures
molecules
compounds
elements
31
What is the sum of the atomic masses of all atoms in a molecule?
molecular mass
atomic mass
half-life
32
Which type of chemical formula gives the number of each type of atom in a molecule?
structural formula
Molecular formula
empirical formula
33
Tiny particles that do not absorb or release energy in a smooth flow is the Quantum theory.
True
False
34
What is the simplest ratio of atoms in a nonmolecular compound?
formula unit
unit cell
mass ratio
atomic ratio
35
The molecules with the same number and types of atoms in different arrangements are called isomers.
False
True
36
Name the compound that contains one uranium atom and six fluorine atoms?
uranuium hexafluoride
uranium monofluoride
uranium difluoride
uranium trifluoride
37
A mixture containing tiny suspended clumps or particles is called a colloid.
True
False
38
Atoms of the same element that have different mass numbers are called isotopes.
True
False
39
The substance in a solution that is dissolved is the solvent.
False
True
40
When a neutron in an atom's nucleus changes into a proton, emitting an electron it is called a
alpha decay
beta decay
gamma decay
41
If an atom is covalently bonded to an atom with different electronegativity then the bond between them is
polar
nonpolar
covalent