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NYU Langone HS STEP Chemistry Review Session #grade_09 #science #chemistry
Flashcards
56 cards
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Practice quiz
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Questions
56
Answers
1
What is the chemical formula of salt?
H2O
NaOH
NaCl
2
Endothermic reactions _______ heat/ thermal energy.
release
dispose
consume
absorb
3
Which state of matter has molecules that move the most freely?
Gas
Solid
Liquid
4
pH scale ranges from ____ to ____ .
1 to 8
0 to 14
3 to 17
5 to 20
5
A catalyst _____ a reaction.
speeds up
slows down
starts
stops
6
Acids have a pH level lower than...
1
13
5
7
7
Which step is NOT part of the “Scientific Method”?
Hypothesis
Conclusion
Opinion
Results
8
Exothermic reactions _______ heat/ thermal energy.
absorb
dispose
consume
release
9
If an atom has 8 protons, 8 neutrons, and 8 electrons, what is the atomic mass?
24
8
32
16
10
What determines matter's state?
Shape
Volume
Mobility
Shape, volume, mobility, and compressibility
11
Salad dressing is an example of an emulsion.
True
False
12
Atomic mass is the number of ...
Protons
Electrons
Electrons and protons
Protons and neutrons
13
Chopping wood is a chemical change.
True
False
14
Condensation is the transition from gas to liquid.
False
True
15
Chemistry is the study of…
Physical and chemical properties
ALL the answers are correct.
Matter
How matter interacts
16
Energy is defined as the capacity to do...
a reaction
movement
work
a marathon
17
In a solid state of matter, what is the primary characteristic of atoms or molecules?
They are not in fixed positions
They do not have enough energy to move
They do have enough energy to move
18
Cations and anions are formed when an atom loses or gains an electron.
False
True
19
Mass is defined as the amount of matter in an object.
True
False
20
Atoms are often referred to as the —————— of matter.
Elements
Legos
Carbohydrates
Building blocks
21
An electron is positively charged.
True
False
22
Atomic numbers are used to organize elements on the periodic table.
True
False
23
Calculate the density of a sample where volume = 100 cm
3
and mass = 200 g.
2 g/cm3
20 g/cm3
4 g/cm3
30 g/cm3
24
The equation for density is ...
mass - volume
mass / volume
mass x volume
volume + mass
25
Neutrons are located in the nucleus of an atom.
False
True
26
Neutrons have neutral charge.
True
False
27
An element cannot be created or broken down.
False
True
28
An atom is the smallest unit of…
Neutron
Matter
Mixture
Element
29
A fire is an endothermic reaction.
True
False
30
Hydrophilic is defined as
neither
both
water loving
water fearing
31
Ice melting is which type of reaction?
endothermic
exothermic
32
Which of the following is a physical change?
Burning
Rotting
Melting
Rusting
33
An atom is NOT made up of….
Electrons
Neutrons
Protons
Elements
34
The pH scale doesn't measure acidity and alkalinity.
True
False
35
Which state of matter takes both the shape and volume of its container?
solid
gas
liquid
36
The octet rule limits the number of electrons in the outer shell to...
1
8
4
7
37
Hydrophobic is defined as
water loving
water fearing
neither
neither
38
Which phase transition is from liquid to solid?
evaporation
condensation
freezing
39
Photosynthesis is an exothermic reaction.
False
True
40
A valence electron is located the _____ of the electron cloud.
middle level
inner level
outer level
41
An atomic number is the number of ...
Protons and neutrons
Electrons
Protons and electrons
Protons
42
Where are electrons located in an atom?
Electron cloud
Outside
Inside
Nucleus
43
Protons are located in the electron cloud of an atom.
True
False
44
Which of the following is a physical property?
Color
Toxicity
Reactivity
Acidity
45
Water is neutral (pH value of 7).
True
False
46
Burning is a chemical change.
True
False
47
Emulsions are bother hydrophobic and hydrophilic.
True
False
48
The charge of an atom with 6 protons and 7 electrons is positive.
False
True
49
Matter is anything that has mass but does not take up space.
False
True
50
In a solid state of matter, what is the primary characteristic of atoms or molecules?
They do not have enough energy to move
They do have enough energy to move
They are not in fixed positions
51
Vinegar is basic.
False
True
52
A chemical element is a/an ________ substance.
created
pure
impure
novel
53
Bases have pH levels greater than ...
8
7
2
3
54
Gas, liquid, and solid are three states of matter.
True
False
55
All of the following are types of chemical reactions, except:
supplication
combination
synthesis
combustion
56
Honey is more dense than water.
False
True
