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Duplicate of 1st Semester Review
Duplicate of 1st Semester Review
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Review material for 1st semester BMMS #8thgradephysicalscience #bmms #mrstabor
Flashcards
80 cards
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Practice quiz
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Questions
80
Answers
1
Compounds can be broken down only by chemical means.
True
False
2
Where are electrons likely found?
the nucleus
mixed throughout an atom
electron clouds
3
Which of the following will
NOT
increase the rate of a chemical reaction?
adding a catalyst
adding an inhibitor
increasing the concentration of reactants
4
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
5
One way to test pH is to use a strip of paper that has several
hydronium ions
acids
indicators
6
What is matter?
the ability to do work
the "stuff" that is light enough to float
the "stuff" that everything is made of
7
During physical changes, matter always retains its
texture
identity
state
8
Why don't noble gases normally form chemical bonds?
They have an empty outer level
They have 2 valence electrons
They have a full outermost energy level
9
Which of the following is a chemical property?
boiling point
reactivity with acid
density
10
The vertical column of elements on the periodic table is called a
period
group
atomic mass
11
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
12
According to Rutherford, what was in the center of an atom?
a nucleus
an electron
a proton
13
What are charged particles that form when atoms gain or lose electrons
ions
particle atoms
atomic ions
14
A neutral solution has a pH of
11
3
7
15
What happens in an endothermic reaction?
energy is taken in
energy is released
energy is created
16
How would you describe the nucleus?
tiny, negatively charged
large, positively charged
dense, positively charged
17
Acids have a
slippery feel
sour taste
bitter taste
18
Periodic law states that
properties of elements change periodically with atomicnumber
elements are either gases, liquids or solids
mercury is a liquid at room temperature
19
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
20
In Thomson's "plum pudding model" of the atom, the plums represent
neutrons
electrons
protons
21
When a base is added to red litmus paper, the indicator turns
purple
blue
red
22
At the end of an experiment, what must you draw?
a bar graph
a picture
a conclusion
23
The elements to the right of the zig zag line on the periodic table are called
metals
nonmetals
metalloids
24
Which of the following chemical equations is balanced?
3Ca +O2 ® 3CaO2
3Ca + 2O2 ® 5CaO2
Ca +O2 ® CaO2
25
What chemical property is responsible for iron rusting?
nonflammability
reactivity with oxygen
conductivity
26
Most of the elements in the periodic table are
gases
metalloids
metals
27
When atoms gain electrons during chemical changes, what charge do they have?
neutral charge
negative charge
positive charge
28
What are the only parts of an atom that make chemical bonds?
neutrons in the nucleus
protons in the nucleus
valence electrons
29
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.
30
Dalton believed that
most substances are made of atoms
atoms of the same element are exactly alike
atoms of different elements are the same
31
In science, what is a scientific theory?
the best idea to explain a hypothesis
the first idea to explain an observation
an explanation for many hypotheses and observations
32
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
33
What is the most important factor in determining how an atom will bond?
the number of protons
the number of neutrons
the number of electrons in the outermost energy level
34
At higher temperatures
particles in an object move faster
gas particles bump into walls less often
a gas contracts
35
Which of the following represents the number of protons in an atom?
covalent number
atomic number
proton number
36
What do atoms gain, lose, or share when they bond?
electrons
neutrons
protons
37
What has mass and takes of space?
weight
space
matter
38
What happens when a liquid becomes a gas?
The particles break away from each other
The particles give off energy
The particles move closer together
39
What happens to matter in a physical change?
It keeps its identity
It combines and forms new substances
Its composition changes
40
What is the joining of atoms to form new substances?
bonding atoms
joining chemicals
chemical bonding
41
Changing the temperature of a gas has no effect on the volume of the gas.
False
True
42
What are the two main branches of physical science?
chemistry and physics
biology and physics
chemistry and biology
43
What did Bohr, Democritus, Thomson, Dalton and Rutherford all have in common?
They each developed ideas about atoms
They each identified the electromagnetic force of atoms
The each identified new electron clouds
44
At higher temperatures
a gas contracts
particles in an object move faster
gas particles bump into walls less often
45
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
46
A substance that is rated 7 on the pH scale is considered
neutral
basic
weak
47
Mendeleev's pattern repeated after how many elements?
every three elements
every seven elements
every five elements
48
Bases have a
slippery feel
sweet taste
sour taste
49
Which of the following properties of metals means that it can be drawn into wires?
malleability
electrical conductivity
ductility
50
This substance has a bitter taste and slippery feel
organic compound
base
acid
51
What makes chemical properties so difficult to observe?
They result in changes of state
Wearing protective glasses is required
Observing them produces new materials
52
What are the left-to-right rows on the periodic table
periods
families
properties
53
What can group numbers on the periodic table help you determine?
the number of valence electrons
the number of protons
the number of electrons
54
Which of the following is a good safety rule to follow?
pay attention to safety information and safety symbols
read lab instructions,but change them if you want to
take shortcuts if there is no danger
55
If a spoonful of salt is mixed in a glass of water, what is the water called?
solute
solution
solvent
56
What element makes up about 20% of the air we breathe?
oxygen
bromine
nitrogen
57
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
58
How did Mendeleev group elements?
by increasing atomic mass
by density
by appearance
59
How can you be sure a chemical reaction is happening?
a solid dissolves
a new substance is formed
water turns to steam
60
In a graduated cylinder containing several liquid layers, the least dense liquid is found
Floating at the top
In the middle layer
In the lightest colored layer
61
What do foods that taste sour usually contain?
base
indicator
acid
62
What element is used to make the most widely used compound in the chemical industry?
tellerium
sulfur
selenium
63
Boiling pt, melting pt, and density are some of an element's
nonreactive properties
chemical properties
physical properties
64
If you poured three liquids into a beaker, how could you tell which one 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
The liquid with the deep red color is the densest liquid
65
How can a compound be broken down?
by chemical changes
by crushing
by physical changes
66
Which of the following has the least mass in an atom?
neutron
electron
nucleus
67
The scientific process begins with asking questions and
making observations
reading background
planning experiments
68
How can you tell that baking a cake produces a chemical change?
It causes changes that are not reversible
It combines the ingredients to form new substances
It produces changes of state in the ingredients
69
The smallest particle into which an element can be divided and still be the same substance is a
nucleus
atom
electon
70
What is the charge of an aluminum ion that has 13 protons and 10 electrons?
1+
2+
3+
71
At the end of an investigation what should you do if your results don't support your hypothesis
buy new measurement tools
change the topic you are studying
repeat your investigation, and then change your hypothesis
72
What is a pure substance made of two or more elements that are chemically combined?
compound
mixture
element
73
Melting crayons is an example of a
physical property
chemical property
physical change
74
How does a physical change differ from a chemical change?
In a physical change new volumes are created
In a physical change the composition is unchanged
In a physical change new materials are produced
75
Heating can break down some compounds
True
False
76
How can organizing data into tables, graphs help scientists analyze their data?
by speeding up the collection of data
by adding color to their website
by making relationships easier to see
77
A property of an element that does not depend on the amount of the element is called a
characteristic property
unique property
finite property
78
What occurs between atoms that do not easily lose electrons?
chemical bonding
metallic bonding
covalent bonding
79
An atom of carbon with 6 protons, 6 electrons and 6 neutrons would have a mass number of
12
18
6
80
Which one of the following tells the physical state of an element at room temperature
the color of the chemical symbol
the atomic number
the atomic mass
