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1st Semester Review
1st Semester Review
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Review material for 1st semester BMMS
Flashcards
96 cards
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Questions
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1
At the end of an experiment, what must you draw?
a conclusion
a picture
a bar graph
2
One way to test pH is to use a strip of paper that has several
acids
indicators
hydronium ions
3
An atom of carbon with 6 protons, 6 electrons and 6 neutrons would have a mass number of
12
18
6
4
Where are electrons likely found?
the nucleus
electron clouds
mixed throughout an atom
5
How can the rate of a reaction be increased?
lowering the temperature of the reactants
grinding a solid reactant into a powder
decreasing the concentration of the reactants
6
What is true of the new substances formed in a chemical reaction?
properties are the same as original substances
properties differ from original substances
all substances have original properties
7
What are the only parts of an atom that make chemical bonds?
protons in the nucleus
valence electrons
neutrons in the nucleus
8
Melting crayons is an example of a
physical change
chemical property
physical property
9
Periodic law states that
properties of elements change periodically with atomicnumber
mercury is a liquid at room temperature
elements are either gases, liquids or solids
10
What is the charge of an aluminum ion that has 13 protons and 10 electrons?
1+
2+
3+
11
How can you tell that baking a cake produces a chemical change?
It produces changes of state in the ingredients
It combines the ingredients to form new substances
It causes changes that are not reversible
12
Acids have a
bitter taste
slippery feel
sour taste
13
The vertical column of elements on the periodic table is called a
group
period
atomic mass
14
Mendeleev's pattern repeated after how many elements?
every seven elements
every three elements
every five elements
15
If hydrogen-1 has 1 proton how many protons does hydrogen-2 have?
1
2
3
16
Which one of the following tells the physical state of an element at room temperature
the atomic number
the atomic mass
the color of the chemical symbol
17
Which statement about isotopes is true?
They have the same number of protons
They have a different atomic number
They have the same number of neutrons
18
What helps light bulbs last longer?
xenon
krypton
argon
19
Which of the following will
NOT
increase the rate of a chemical reaction?
adding an inhibitor
adding a catalyst
increasing the concentration of reactants
20
Which of the following represents the number of protons in an atom?
proton number
atomic number
covalent number
21
A substance that is rated 7 on the pH scale is considered
weak
basic
neutral
22
What are charged particles that form when atoms gain or lose electrons
atomic ions
particle atoms
ions
23
Why don't noble gases normally form chemical bonds?
They have an empty outer level
They have a full outermost energy level
They have 2 valence electrons
24
What is the most important factor in determining how an atom will bond?
the number of neutrons
the number of electrons in the outermost energy level
the number of protons
25
Pressure in a gas filled container is caused by gas particles hitting walls of the container
True
False
26
The elements to the right of the zig zag line on the periodic table are called
metals
nonmetals
metalloids
27
What occurs between atoms that do not easily lose electrons?
metallic bonding
covalent bonding
chemical bonding
28
How can a compound be broken down?
by chemical changes
by physical changes
by crushing
29
When atoms gain electrons during chemical changes, what charge do they have?
negative charge
neutral charge
positive charge
30
Why does the law of conservation of mass dictate that chemical equations be balanced?
because elements are classified by weight
because chemical formulas are written from left to right
because atoms are never gained or lost in a chemicalreaction
31
In science, what is a scientific theory?
an explanation for many hypotheses and observations
the first idea to explain an observation
the best idea to explain a hypothesis
32
Hypotonic solution results in a net gain of water from the cell
True
False
33
Weight and mass are the same thing
True
False
34
What do atoms gain, lose, or share when they bond?
neutrons
protons
electrons
35
What is a pure substance made of two or more elements that are chemically combined?
compound
mixture
element
36
Which of the following is a chemical property?
boiling point
density
reactivity with acid
37
Dalton believed that
atoms of the same element are exactly alike
atoms of different elements are the same
most substances are made of atoms
38
Compounds can be broken down only by chemical means.
True
False
39
At higher temperatures
a gas contracts
gas particles bump into walls less often
particles in an object move faster
40
If a chemical symbol in a chemical formula has no subscript, it means
the element has no charge.
only one atoms of the element is in the molecule.
the chemical is listed last in the formula.
41
What element is used to make the most widely used compound in the chemical industry?
tellerium
sulfur
selenium
42
If a spoonful of salt is mixed in a glass of water, what is the water called?
solute
solution
solvent
43
What are the two main branches of physical science?
chemistry and biology
biology and physics
chemistry and physics
44
In Thomson's "plum pudding model" of the atom, the plums represent
protons
electrons
neutrons
45
How many carbon atoms are in this glucose molecule? C
6
H
12
O
6
<b style="vertical-align: sub;">
six
three
twelve
46
A property of an element that does not depend on the amount of the element is called a
finite property
unique property
characteristic property
47
Compounds found in all living things include
proteins
ammonia
mercury oxides
48
What are the left-to-right rows on the periodic table
families
properties
periods
49
Heating can break down some compounds
False
True
50
What happens to matter in a physical change?
It keeps its identity
It combines and forms new substances
Its composition changes
51
The smallest particle into which an element can be divided and still be the same substance is a
electon
nucleus
atom
52
What has mass and takes of space?
weight
space
matter
53
Which of the following chemical equations is balanced?
3Ca +O2 ® 3CaO2
Ca +O2 ® CaO2
3Ca + 2O2 ® 5CaO2
54
What is the joining of atoms to form new substances?
joining chemicals
bonding atoms
chemical bonding
55
How are metalloids similar to metals?
Some are good conductors of electric current
Some are shiny, while others are dull
They have some properties of nonmetals
56
What is matter?
the "stuff" that is light enough to float
the "stuff" that everything is made of
the ability to do work
57
During physical changes, matter always retains its
state
identity
texture
58
What happens in an endothermic reaction?
energy is created
energy is released
energy is taken in
59
In a graduated cylinder containing several liquid layers, the least dense liquid is found
In the middle layer
Floating at the top
In the lightest colored layer
60
What makes chemical properties so difficult to observe?
Wearing protective glasses is required
They result in changes of state
Observing them produces new materials
61
The scientific process begins with asking questions and
planning experiments
making observations
reading background
62
How would you describe the nucleus?
dense, positively charged
large, positively charged
tiny, negatively charged
63
How can you be sure a chemical reaction is happening?
water turns to steam
a solid dissolves
a new substance is formed
64
Which of the following properties of metals means that it can be drawn into wires?
ductility
electrical conductivity
malleability
65
Which of these factors could affect the temperature at which water boils?
The size and shape of the pot in which the water is heated
The atmospheric pressure at which the water is heated
The amount of heat added to the water
66
Why should you
NEVER
taste or touch an unknown acid?
It could be slippery
It could smell bad
It could be corrosive
67
Which of the following has the least mass in an atom?
electron
nucleus
neutron
68
What do foods that taste sour usually contain?
indicator
base
acid
69
At the end of an investigation what should you do if your results don't support your hypothesis
repeat your investigation, and then change your hypothesis
change the topic you are studying
buy new measurement tools
70
According to Rutherford, what was in the center of an atom?
a proton
an electron
a nucleus
71
How can organizing data into tables, graphs help scientists analyze their data?
by adding color to their website
by speeding up the collection of data
by making relationships easier to see
72
According to Charles's Law
decreasing gas temp causes pressure on moleculesto decrease
decreasing gas temp causes volume of gas to increase
increasing gas temp causes volume of gas to increase
73
What happens when a liquid becomes a gas?
The particles break away from each other
The particles move closer together
The particles give off energy
74
How did Mendeleev group elements?
by density
by increasing atomic mass
by appearance
75
Which of the following is a good safety rule to follow?
take shortcuts if there is no danger
pay attention to safety information and safety symbols
read lab instructions,but change them if you want to
76
What element makes up about 20% of the air we breathe?
oxygen
bromine
nitrogen
77
Boyle's law states that for a fixed amount of gas
at a constant temp volume of gas inversely relates to pressu
at a constant pressure volume of gas relates to temp
at a constant temp volume of gas directly relates to pressur
78
What must be done for a chemical equation to be balanced?
All atoms must be counted
All chemicals must be equal
All molecules must be counted
79
If you poured three liquids into a beaker, how could you tell which one is the densest liquid?
The liquid with the deep red color is the densest liquid
The liquid that is floating on top is the densest liquid
The liquid that settles to the bottom is the densest liquid
80
What did Bohr, Democritus, Thomson, Dalton and Rutherford all have in common?
They each identified the electromagnetic force of atoms
The each identified new electron clouds
They each developed ideas about atoms
81
How many atoms are represented in the formula CaCO
3?
five
four
three
82
A neutral solution has a pH of
11
3
7
83
Changing the temperature of a gas has no effect on the volume of the gas.
False
True
84
Boiling pt, melting pt, and density are some of an element's
chemical properties
nonreactive properties
physical properties
85
What is necessary for substances to burn?
hydrogen
oxygen
helium
86
Most of the elements in the periodic table are
metalloids
metals
gases
87
How does a physical change differ from a chemical change?
In a physical change new volumes are created
In a physical change new materials are produced
In a physical change the composition is unchanged
88
When a base is added to red litmus paper, the indicator turns
blue
purple
red
89
This substance has a bitter taste and slippery feel
base
organic compound
acid
90
Which of the following occurs when a liquid becomes a gas?
The particles create energy
The particles clump together
The particles break away from one another
91
An isotonic solution results in no net charge in the cell
False
True
92
How many sodium atoms are present in this molecule? 7Na
3
PO
4
21
3
7
93
Bases have a
sweet taste
slippery feel
sour taste
94
What can group numbers on the periodic table help you determine?
the number of protons
the number of valence electrons
the number of electrons
95
What is the basic unit of length that a scientist is likely to use?
foot
meter
micrometer
96
What chemical property is responsible for iron rusting?
nonflammability
reactivity with oxygen
conductivity
