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Mid Term Science Exam 2019
Mid Term Science Exam 2019
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Review for midterm for science exam
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1
Photosynthesis
Process by which giant beanstalks grow.
The process by which plants die.
The process by which plants make their own food.
2
Which of these is the law of conservation of mass?
Molar mass of materials is equal to the products
All mass is equal
The products are twice the amount of the reactants
Total mass of reactants must equal the mass of the products
3
In chemical reactions, what does The Law of Conservation of Mass mean?
total of reactants is less than total of products
Matter is not created or destroyed
Matter is not changed
Total of the mass is more than the total of the reactants
4
What information in the periodic table indicates the number of protons?
the elements atomic mass
the position of the element in its column
the elements atomic number
the elements chemical symbol
5
Which statement is true about a column on the periodic table?
the elements have the same atomic number
the elements have a wide variety of characteristics
the elements have similar properties
the elements have the same atomic mass
6
Which group of elements have properties of metals and nonmetals?
transitions metals
halogens
metalloids
noble gases
7
The modern periodic table is organized by atomic mass
True
False
8
What is vaporization?
a gas becoming a solid
a liquid becoming a gas
a gas becoming a liquid
a liquid becoming a solid
9
In what state of matter do the particles spread apart to fill all the space available to them?
gas
crystal
liquid
solid
10
In which state of matter are particles packed tightly together in a fixed position?
solid
compound
liquid
gas
11
What is the law of conservation of mass?
states that matter is Created but not destroyed
States that matter is Neither created but destroyed
None of Above
States that matter is neither created or destroyed
12
How do liquid water, ice and water vapor differ from each other?
different compounds
made of different kinds of atoms
all states of matter
made of different kinds of molecules
13
Chemistry is
a rapid reaction between oxygen and a substance
anything that has mass and takes up space
characteristic that can be observed
the study of matter and how matter changes
14
The reactants for cellular respiration are
carbon dioxide and water
oxygen and glucose
15
On the periodic table, the most reactive metals are found
in period 1
groups 13 - 16
in group 1
periods 6 and 7
16
The location of an element on the periodic table predicts the elements
chemical name
chemical symbol
when it was discovered
properties
17
Soil, a salad, and sugar water are all examples of
mixtures
compounds
atoms
elements
18
The resistance of a liquid to flow
crystal
temperature
volume
viscosity
19
Which particles in an atom have a negative charge?
neutrons
protons
electrons
nuclei
20
The atomic number of an element is based on
number of protons
number of electrons
mass of its nucleus
number of neutrons
21
At room temperature, more than half of the nonmetal elements are
gases
alloys
liquids
solids
22
Electrons involved in bonding between atoms are
inside the nucleus
valence electrons
positively charged
closest to the nucleus
23
Stomata are...
... a type of fish
... tubes that bring water to the plant's leaves
... openings on the leaf's surface that allow gas exchange
... tubes that bring food to the plant's leaves
24
Which group contains the most reactive metals?
noble gases
alkali metals
carbon family
alkaline earth metals
25
All elements are made of basic particles called
mixtures
molecules
atoms
compounds
26
What is Cellular respiration ?
cell membrane
Process that uses oxygen to release energy from food.
Each process provides the materials
27
What things use Cellular Respiration?
Plants
Every living thing
Everything
Animals
28
Substances on the left of a chemical equation
precipitates
reactants
coefficients
products
29
Nonmetals can be found on the left of the periodic table
False
True
30
How are photosynthesis and Cellular Respiration related?
they have the same equation
they both produce oxygen
they have opposite equations
they both produce carbon dioxide
31
A substance the undergoes a chemical change is still the same substance
True
False
32
An example of a chemical change
burning wood
crushing a can
filtering a mixture
boiling water
33
How does photosynthesis happen
Plants use CO2 water and sunlight to create glucose to use as energy
Magic
I don't know ask the teacher
something I can't explain
34
An example of a physical change
dissolving salt in water
toasting marshmallows
burning paper
baking cookies
35
Shorter way to show a chemical reaction using symbols
chemical equations
chemical formula
subscript
symbol
36
A material is said to be ductile if it
can be hammered into thin sheets
can transfer heat and electricity
can be pulled or drawn into wire
is a mixture of a metal with another element
37
Elements that do not ordinarily form compounds are
elements in the carbon family
metals
noble gases
halogens
38
The change from a liquid to a solid is called?
condensation
freezing
sublimation
boiling
39
Particles in a liquid move around just as freely as particles in solid
False
True
40
What are the Reactants of Cellular Respiration?
C6+12H
5C1 1/5+H
6CHO
C6H12O6 + 6O2
41
What are the products of cellular respiration?
carbon dioxide and water
oxygen and glucose
42
Why is the law of conservation of mass true?
all molecules at the start of reaction are there at the end
all atoms at start of reaction are there at end
the substances gain more atoms at the beginning of reaction
43
The two most common alkaline earth metals are
calcium and magnesium
iron and silver
copper and zinc
sodium and potassium
44
Plants are incapable of cellular respiration.
False
True
45
Elements in the same period on the periodic table have the same number of
orbitals(energy levels)
atomic mass
valence electrons
electrons
46
If you describe a gas that easily catches fire, this is a
chemical formula
chemical property
physical property
state of matter
47
Which term means metals can be rolled into thin sheets or hammered?
ductile
alloy
polar
malleable
48
What are the products of cellular respiration?
Water, Carbon Dioxide, + Energy
Water, ATP, and Oxygen
Carbon Dioxide and Glucose
Glucose and Oxygen
49
The amount of matter in a chemical reaction
changes.
False
True
50
CaCO
3
Represents a chemical
compound
reaction
subscript
symbol
51
Fluorine, chlorine, bromine, and iodine are all part of what family?
alkali metals
metalloids
halogens
noble gases
52
cellular respiration that requires oxygen
active transport
passive transport
aerobic respiration
not aerobic respiration
53
In which state of matter are particles packed tightly together in a fixed position?
liquid
compound
gas
solid
54
A chemical reaction may be detected by changes in the properties of matter
True
False
55
Water droplets form on the side of your glass, this process is known as
condensation
freezing
vaporization
melting
56
Is this chemical equation following the Law of Conservation of Mass?
yes
no
57
Photosynthesis Equation
6H2O + 6O2 ---> C6H12O2 + 6O2
H2O + O2 ---> C6H12O6 + O2
6H3O + 6O2 --> C6H12O6 + 6O2
CO2 + 6H2O + light ---> C6H12O6 + 6O2
58
If you measure the temperature at which something boils, you are measuring a
physical property
chemical property
molecular property
atomic property
59
In an atom the number of protons equals the number of
electrons
isotopes
nuclei
neutrons
60
The horizontal rows in the periodic table are called
groups
True
False
61
A change that produces one or more new substances is called a
physical change
False
True
62
Anything that has mass and takes up space is called?
heterogeneous
homogeneous
matter
energy
63
What are the Products of Cellular Respiration?
Both A and B
None of the Above
6CO2 + 6H2O + ATP
12CHO6
64
During the process of sublimation,
a solid turns into a liquid
a gas turns directly into a solid
a liquid turns into a gas
a solid turns directly into a gas
65
Cellular Respiration Occurs in the Mitochondria
True
False
66
The only sure evidence of a chemical reaction is
a color change
a formation of a gas
changes in properties
the production of one or more new substances
67
Which is a green organelle where photosynthesis occurs?
Nucleolus
Ribosome
Cell Wall
Chloroplast
68
Which group contains the most elements?
transition elements
metals
metalloids
nonmetals
69
What are the products of photosynthesis?
carbon dioxide and sugars (glucose)
oxygen and sugars (glucose)
carbon dioxide and water
oxygen and water
70
What part of the atom move around the nucleus ?
neutrons
protons
atomic mass units
electrons
71
The smallest part of an element is called an atom
True
False
