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Chem 151
Chem 151
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Exam 1
Flashcards
45 cards
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Practice quiz
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Questions
45
Answers
1
Name the seven elements which exist as diatomic molecules?
Oxygen, iodine, copper, cobalt ,sodium , hydrogen, silver
Hydrogen, flourine, carbon,cobalt, sodium, nitrogen, oxygen
Oxygen,bromine, nitrogen, uranium, sodium, magnesium, flourine
Hydrogen, nitrogen, oxygen, flourine, chlorine, bromine, and iodine
2
What kind of change takes place when the size, shape, or state of matter is altered?
Chemical change
Physical change
Chemical bond
Chemical reaction
3
Write the measurement 5280 as scientific notation
5.28 × 10^3
.5800 × 10^4
5.800 × 10^3
52800 × 10^3
4
What is the empirical formula for a molecule of glucose (C6H12O6)?
CH2O3
CH2O
C3H6O3
C2H4O2
5
The weight of the object ________ as the object is moved away from earth.
Changes
Decreases
Constant
Increases
6
How many hydrogen atoms are in (NH4)2C2O4?
8
10
7
6
7
What is the mass of 20.0 mL sulfuric acid, the density of the acid = 1.84 g/mL
67.2 g
76.89 g
36.8 g
34.7 g
8
Change 17 cm to mm
170 mm
17.0 mm
17.2 mm
1700 mm
9
What form of matter results when two or more elements chemically combine?
Ionic compound
Atom
Compound
Element
10
What did james Chadwick do concerning the discovery of subatomic particles?
Mass
Protons
Neutrons
Electrons
11
What kind of change takes place when a new substance is formed?
Physical change
Chemical change
Physical reaction
Chemical bond
12
What subatomic particles are found in the nucleus of an atom?
Electrons and protons
Protons and nuetrons
Protons
Nuetrons
13
The atomic mass for a single atom must be a whole number
False
True
14
How many sig figs in 103000
3
5
2
6
15
Where on the periodic table would metals be found?
Left of metalloids
Left side
Right of halogens
Right of metalloids
16
What state of matter has no definite shape or volume?
Ice
Liguid
Solid
Gas
17
What is the most common element in the human body?
Hydrogen
Chlorine
Oxygen
Sodium
18
Define the law of definite proportions?
A compound always contains two or more elements combined in a definite mass
The same amount of atoms in the nucleus
In a compound there elements have the same mass
Always the same mass
19
17.6 mL of distilled water has a mass of _______ grams.
17.6 g
1760 g
17.60 g
176000 g
20
What is the volume of 30.0 g of oil that has a density of 0.850 g/mL?
56.7 mL
12.4 mL
35.3 mL
87.2 mL
21
Change 429 Cg to Kg
429.0 Kg
4290 Kg
42900 Kg
0.00429 Kg
22
Change 89m to cm
8900 cm
89000 cm
890 cm
89.9 cm
23
Change 3.6 L to mL
360 mL
36.2 mL
3600 mL
3.600 mL
24
What is the SI unit if mass?
Liter
Kilogram
Gram
Lbs
25
Give an example of two isotopes for the same element.
Cobalt -60 & Sodium-12
Cobalt-12 & Carbon-12
Copper-12 & Cobalt-16
Carbon-12 & Carbon-14
26
What is the smallest unit of matter that still exhibits the properties of a given element.
Atom
Element
Gram
Molecule
27
42.5 °C is what number expressed in Kelvin?
214.6 K
302.7 K
315.7 K
645.2 K
28
Explain the meaning of the following representation 32^ S
There is 16 neutrons
A specific single atom of sulfur having 16 protons and 16 neutrons
There is 16 electrons
There is 16 protons
29
Explain the importance of the scientific method?
Finding a theory
Solving an experiment
Creating a experiment
Method of questioning
30
The atomic mass for an element must be a whole number.
True
False
31
What particles are responsible for most of the mass of an atom?
Nuetrons
Protons
Electrons and Nuetrons
Protons and Nuetrons
32
Change 13 mm to cm
1.3 cm
130 cm
13000 cm
13 cm
33
Mass is the quantity of _______ that an object possesses.
Weight
Ibs.
Matter
Grams
34
Write the measurement 1.23 × 10^-3 as a number with decimal places
0.0000123
123.0
0.00123
0.000123
35
What are the main ideas presented in Daltons Atomic Theory?
All matter is composed of electrons
All matter is composed of atoms
All elements have atoms
All matter is built the same
36
Why is dimensional analysis talked about and considered so important?
Completes the scientific notation
Makes you use the right mass
Forces the answer into the correct units
Remains a compound
37
A hypothesis is the most widely accepted explanation for an observation among the scientific community
False
True
38
What is a heterogeneous mixture?
Solid mixture
Mutiple parts
Only one component
Components of mixture remain sperated
39
What scientist observed the trends of different elements and developed the periodic table?
Huber grant
Dimitri mendeleev
Thompson
Dalton
40
Change 796mL to L
0.796 L
79.6 L
79600 L
7960 L
41
11.0 °C to °F
62.3 °F
53.76 °F
51.98 °F
87.2 °F
42
How many total atoms are represented in NaC2H3O2?
3
8
12
6
43
The mass of an object _________ as the object is moved away from earth.
Increases
Decreases
Stays the same
Changes
44
What scientist first observed the electron?
Mandel
Dalton
Dimitri
Thompson
45
H20 and H2O2 represent what ?
Elements
Law of definite compisitions
Nitrates
Nuetrons
