Physical or Chemical Change Exam Flashcards
1
Q
- observed with senses
- determined without destroying matter
A
Physical property
2
Q
- indicates how a substance
- matter will be changed into a new
substance after the reaction
A
Chemical Property
3
Q
blue color
A
Physical Property
4
Q
density
A
Physical Property
5
Q
flammability (burns)
A
Chemical Property
6
Q
flammability (burns)
A
Chemical Property
7
Q
solubility (dissolves)
A
Physical Property
8
Q
reacts with acid
A
Chemical Property
9
Q
supports combustion
A
Chemical Property
10
Q
sour taste
A
Physical Property
11
Q
melting point
A
Physical Property
12
Q
reacts with water
A
Chemical Property
13
Q
hardness
A
Physical Property
14
Q
boiling point
A
Physical Property
15
Q
luster
A
Physical Property
16
Q
odor
A
Physical Property
17
Q
reacts with air
A
Chemical Property
18
Q
- a change in size, shape, or state
- no new substance is formed
A
Physical change
19
Q
- a change in the physical and chemical properties
- a new substance is formed
A
CHEMICAL CHANGE
20
Q
NaCl (Table Salt) dissolves in water.
A
Physical Change
21
Q
Ag (Silver) tarnishes.
A
Chemical Change
22
Q
An apple is cut
A
Physical Change
23
Q
Heat changes H₂O to steam.
A
Physical Change
24
Q
Baking soda reacts to vinger..
A
Chemical Change
25
Fe (Iron) rusts
Chemical Change
26
Alcohol evaporates
Physical Change
27
Ice melts.
Physical Change
28
Milk sours.
Chemical Change
29
Sugar dissolves in water.
Physical Change
30
Wood rots.
Chemical Change
31
Pancakes cook.
Chemical Change
32
Grass grows.
Chemical Change
33
A tire is inflated
Physical Change
34
Food is digested.
Chemical Change
35
Paper towel absorbs water.
Physical Change
36
An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone.
Physical Change
37
Two chemical are mixed together and a gas is produce.
Chemical Change
38
A bicycle changes color as it rusts.
Chemical Change
39
A solid is crushed to a powder.
Physical Change
40
Two substances are mixed and light is produced.
Chemical Change
41
A piece of ice melts and reacts with sodium.
Physical and Chemical Change
42
Mixing salt and pepper.
Physical Change
43
Chocolate syrup is dissolved in milk.
Physical Change
44
A marshmallow is toasted over a campfire.
Chemical Change
45
A marshmallow is cut in half.
Physical Change
46
Umm! A student removes a loaf of bread 1. hot from the oven. The student cuts a slice off the loaf and spreads butter on it.
Physical or Chemical Change ?
What is the evidence?
Physical Change
No change in substances.
No unexpected color change, temperature, change or gas given off.
47
Your friend decides to toast a piece of bread, but leaves it in the toaster too long. The bread is black and the kitchen if full of smoke.
Physical or Chemical Change ?
What is the evidence?
Chemical Change
Identity of substances change.
Blackening of bread and smoke is the new substance.
48
You forgot to dry the bread knife when you washed it and reddish brown spots appeared on it
Physical or Chemical Change ?
What is the evidence?
Chemical Change
Identity of substances change.
Iron of knife forms rust
49
You blow dry your wet hair.
Physical or Chemical Change ?
What is the evidence?
Physical Change
No change in substances.
No unexpected color change, temperature change or gas given off.
50
In baking biscuits and other quick breads. the baking powder reacts to release carbon. dioxide bubbles. The carbon dioxide bubbles cause the dough to rise
Physical or Chemical Change ?
What is the evidence?
Chemical Change
Identity of substances change.
Gas is produced.
51
In baking biscuits and other quick breads. the baking powder reacts to release carbon. dioxide bubbles. The carbon dioxide bubbles cause the dough to rise
Physical or Chemical Change ?
What is the evidence?
Chemical Change
Identity of substances change.
Gas is produced.
52
You take out your best silver spoons and 6. notice that they are very dull and have some black spots.
Physical or Chemical Change ?
What is the evidence?
Chemical Change
Identity of substances change.
Silver oxide produced
53
A straight piece of wire is coiled to form a spring.
Physical or Chemical Change ?
What is the evidence?
Physical Change
No change in substances.
No unexpected color change, temperature change or gas given off
54
Food color is dropped into water to give it color.
Physical or Chemical Change ?
What is the evidence?
Physical Change
No change in substances.
No unexpected color change, temperature change or gas given off
55
Chewing food to break it down into smaller particles represents a ______ change, but the changing of starch into sugars by enzymes in the digestive system represents a ______ change.
Physical or Chemical Change ?
What is the evidence?
Physical Change then Chemical Change
Chewing breaks down matter into smaller.
particles of the same substance. Enzymes change starch into sugar which is a new substance.
56
In a fireworks show, the fireworks explode giving off heat and light.
Physical or Chemical Change ?
What is the evidence?
Physical Change
Identity of substances change.
Fireworks combust making new products and energy.
57
Changing the size and shapes of pieces of wood would be a chemical change
True (T) or False (F)
F
58
In a physical change, the makeup of matter is changed.
True (T) or False (F)
F
59
Evaporation occurs when liquid water changes into a gas.
True (T) or False (F)
T
60
Evaporation is a physical change
True (T) or False (F)
T
61
Burning wood is a physical change
True (T) or False (F)
F
62
Combining hydrogen and oxygen to make water is a physical change.
True (T) or False (F)
F
63
Breaking up concrete is a physical change.
True (T) or False (F)
T
64
Sand being washed out to sea from the beach is a chemical change.
True (T) or False (F)
F
65
When ice cream meits, a chemical change occurs.
True (T) or False (F)
F
66
Acid rain damaging a marble statue is a physical change.
True (T) or False (F)
F
67
Acid rain damaging a marble statue is a physical change.
True (T) or False (F)
F
68
A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
periodic table
69
A horizontal row of elements in the periodic table
Period
70
a vertical column of elements in the periodic table
Group
71
An atom or group of atoms that has a positive or negative charge.
Ion
72
electrons occupy orbitals of the same energy in a way that makes the number of electrons with the same spin direction as large as possible
Hund's Rule
73
An atomic orbital may describe at most two electrons, each with opposite spin direction
pauli exclusion principle
74
Elements that are poor conductors of heat and electric current
Nonmetals
75
Elements that are good conductors of heat and electric current.
metal
76
5-7
nonmetal
77
4
nonmetal/metal
78
1-3
metal
79
A chemical reaction involving the transfer of one or more electrons from one substance to another substance
redox reaction
80
element or compound
substance
81
A negatively charged ion
Anion
82
A positively charged ion
Cation
83
A combination of chemical symbols and numbers to represent a substance
chemical formula
84
refers to items intended for personal use that contains chemical substances or mixtures
consumer products
85
A technique that is used to separate the components of a mixture based on the tendency of each component to travel or be drawn across the surface of another material.
Chromatography
86
how many hydrogen in C2H4
4
87
How many carbon in C2H4
2
88
how many atom in C2H4
6
89
how many kinds of atom are there in C2H4
2
90
simplest form of organic compound
Alkane
91
simplest form of hydrocarbon
Methane
92
hydrocarbons that contain similar ring structures
aromatic hydrocarbons
93
not found in nature and does not contain carbon
non organic compound
94
the process by which one or more substances change to produce one or more different substances
chemical reaction
95
A chemical substance that is present at the start of a chemical reaction
Reactant
96
A pure substance made of only one kind of atom
Element
97
a diagram that shows the distribution of electrons in the orbitals of the energy levels
orbital diagram
98
7 stable elements
helium - 2
neon - 10
argon - 18
krypton - 36
xenon - 54
radon - 86
oganesson - 118
99
uses stable elements as shortcut way of writing the e.c.
core method of electronic configuration
100
only aplies on alkane
condensed structural formula
101
consists of an element's symbol, representing the atomic nucleus and inner-level electrons, that is surrounded by dots, representing the atom's valence electrons
electron dot structure
102
diagram of a molecule using dots to represent valence electrons
element symbol+atomic number
Lewis Dot Structure
103
a bond formed by the attraction between positively charged metal ions and the electrons around them
metal-metal
Metallic bonding
104
Center of an atom
Nucleus
105
A subatomic particle that has a negative charge
electron
106
A subatomic particle that has no charge and that is found in the nucleus of an atom
Neutron
107
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Proton
108
The average mass of all the isotopes of an element
atomic mass
109
Atoms with the same number of protons but different numbers of neutrons
isotopes
110
Atoms with the same number of protons but different numbers of neutrons
isotopes
