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BMMS 1st Semester Review Flashcards | StudBud
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BMMS 1st Semester Review
BMMS 1st Semester Review
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Review material for 1st semester BMMS
Flashcards
71 cards
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Practice quiz
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Questions
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Answers
1
A characteristic of an element that does not depend on the amount of the element is
density
finite property
unique property
2
During physical changes, matter always retains its
texture
state
identity
3
What is the joining of atoms to form new substances?
chemical bonding
bonding atoms
joining chemicals
4
If you poured three liquids into a beaker, how could you tell which one is the densest liquid?
The liquid that settles to the bottom 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
5
The scientific process begins with asking questions and
planning experiments
making observations
reading background
6
When atoms gain electrons during chemical changes, what charge do they have?
neutral charge
negative charge
positive charge
7
Most of the elements in the periodic table are
gases
metalloids
metals
8
How can a compound be broken down?
by physical changes
by crushing
by chemical changes
9
How does a physical change differ from a chemical change?
In a physical change the composition is unchanged
In a physical change new materials are produced
In a physical change new volumes are created
10
What are the two main branches of physical science?
chemistry and physics
chemistry and biology
biology and physics
11
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 amount of heat added to the water
The atmospheric pressure at which the water is heated
12
What are the left-to-right rows on the periodic table
families
periods
properties
13
What is the basic unit of length that a scientist is likely to use?
micrometer
foot
meter
14
Pressure in a gas filled container is caused by gas particles hitting walls of the container
False
True
15
What are charged particles that form when atoms gain or lose electrons
ions
atomic ions
particle atoms
16
How are metalloids similar to metals?
Some are shiny, while others are dull
Some are good conductors of electric current
They have some properties of nonmetals
17
What do foods that taste sour usually contain?
base
acid
indicator
18
What chemical property is responsible for iron rusting?
reactivity with oxygen
conductivity
nonflammability
19
How can organizing data into tables, graphs help scientists analyze their data?
by adding color to their website
by making relationships easier to see
by speeding up the collection of data
20
Which is true?
most substances are made of atoms
atoms of the same element are exactly alike
atoms of different elements are the same
21
How did Mendeleev group elements?
by appearance
by density
by increasing atomic mass
22
At higher temperatures
gas particles bump into walls less often
a gas contracts
particles in an object move faster
23
How many carbon atoms are in this glucose molecule? C
6
H
12
O
6
<b style="vertical-align: sub;">
twelve
three
six
24
At the end of an experiment, what must you draw?
a bar graph
a conclusion
a picture
25
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
26
In a graduated cylinder containing several liquid layers, the least dense liquid is found
In the lightest colored layer
Floating at the top
In the middle layer
27
What happens when a liquid becomes a gas?
The particles give off energy
The particles break away from each other
The particles move closer together
28
What is the charge of an aluminum ion that has 13 protons and 10 electrons?
1+
2+
3+
29
The vertical column of elements on the periodic table is called a
atomic mass
group
period
30
If hydrogen-1 has 1 proton how many protons does hydrogen-2 have?
2
1
3
31
What occurs between atoms that do not easily lose electrons?
covalent bonding
metallic bonding
chemical bonding
32
What is matter?
the "stuff" that everything is made of
the "stuff" that is light enough to float
the ability to do work
33
If a spoonful of salt is mixed in a glass of water, what is the water called?
solute
solvent
solution
34
What are the only parts of an atom that make chemical bonds?
valence electrons
neutrons in the nucleus
protons in the nucleus
35
How can you be sure a chemical reaction is happening?
a new substance is formed
a solid dissolves
water turns to steam
36
What is true of the new substances formed in a chemical reaction?
properties differ from original substances
properties are the same as original substances
all substances have original properties
37
Compounds can be broken down only by chemical means.
False
True
38
Where are electrons likely found?
mixed throughout an atom
electron clouds
the nucleus
39
Melting crayons is an example of a
physical change
chemical property
physical property
40
The elements to the right of the zig zag line on the periodic table are called
nonmetals
metalloids
metals
41
According to Charles's Law which of these is true?
decreasing gas temp causes volume of gas to increase
decreasing gas temp causes pressure on moleculesto decrease
increasing gas temp causes volume of gas to increase
42
What happens to matter in a physical change?
It combines and forms new substances
It keeps its identity
Its composition changes
43
What is the most important factor in determining how an atom will bond?
the number of protons
the number of electrons in the outermost energy level
the number of neutrons
44
Changing the temperature of a gas has no effect on the volume of the gas.
True
False
45
Which statement about isotopes is true?
They have a different atomic number
They have the same number of neutrons
They have the same number of protons
46
What makes chemical properties so difficult to observe?
Observing them produces new materials
They result in changes of state
Wearing protective glasses is required
47
What is a pure substance made of two or more different elements that are chemically combined?
mixture
compound
element
48
If a chemical symbol in a chemical formula has no subscript, it means
only one atoms of the element is in the molecule.
the chemical is listed last in the formula.
the element has no charge.
49
Which of the following represents the number of protons in an atom?
atomic number
proton number
covalent number
50
The smallest particle into which an element can be divided and still be the same substance is a
nucleus
atom
electon
51
What must be done for a chemical equation to be balanced?
All chemicals must be equal
All atoms must be counted
All molecules must be counted
52
How many sodium atoms are present in this molecule? 7Na
3
PO
4
3
7
21
53
How can you tell that baking a cake produces a chemical change?
It produces changes of state in the ingredients
It causes changes that are not reversible
It combines the ingredients to form new substances
54
Which of the following chemical equations is balanced?
Ca +O2 ® CaO2
3Ca +O2 ® 3CaO2
3Ca + 2O2 ® 5CaO2
55
Heating can break down some compounds
False
True
56
What can group numbers on the periodic table help you determine?
the number of protons
the number of electrons
the number of valence electrons
57
Boiling pt, melting pt, and density are some of an element's
chemical properties
nonreactive properties
physical properties
58
How would you describe the nucleus?
dense, positively charged
large, positively charged
tiny, negatively charged
59
Which of the following occurs when a liquid becomes a gas?
The particles break away from one another
The particles clump together
The particles create energy
60
What do atoms gain, lose, or share when they bond?
neutrons
electrons
protons
61
Which of the following has the least mass in an atom?
nucleus
neutron
electron
62
Weight and mass are the same thing
False
True
63
What has mass and takes of space?
space
matter
weight
64
A neutral solution has a pH of
7
11
3
65
An atom of carbon with 6 protons, 6 electrons and 6 neutrons would have a mass number of
12
6
18
66
Which of the following is a chemical property?
reactivity with acid
density
boiling point
67
Which of the following properties of metals means that it can be drawn into wires?
malleability
electrical conductivity
ductility
68
What happens in an endothermic reaction?
energy is taken in
energy is released
energy is created
69
Why does the law of conservation of mass dictate that chemical equations be balanced?
because chemical formulas are written from left to right
because elements are classified by weight
because atoms are never gained or lost in a chemicalreaction
70
How many atoms are represented in the formula CaCO
3?
three
four
five
71
What element makes up about 20% of the air we breathe?
nitrogen
oxygen
bromine
