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1st 9 Weeks Exam Flashcards | StudBud
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1st 9 Weeks Exam
1st 9 Weeks Exam
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1
What mass of sulfur would have 5.2x10
22
atoms of sulfur?
6.0g S
4.7g S
1.3g S
2.8g S
2
How much mass in grams is in a 1.75 mole sample of silicon?
8.65g
49.1g
2.72g
115g
3
250 g of Ca is how many moles?
5,280 mol
7.85 mol
.305 mol
6.24 mol
4
Find average atomic mass. Pb-204 at 20% Pb-207 at 30% and Pb-208 at 50%
207.2 amu
206.9 amu
205.9 amu
204.7 amu
5
Which two subatomic particles are in the nucleus?
protons and electrons
neutrons and electrons
protons and neutrons
none of the above
6
Which is an intensive property?
volume
Boiling point
mass
number of moles
7
An atom of an element with atomic number 50 and mass number of 120 contains:
70 protons 70 electrons 50 neutrons
120 protons 50 electrons 70 neutrons
70 protons 70 electrons 70 neutrons
50 protons 50 electrons 70 neutrons
8
If a substance cannot be separated by physical or chemical means, it is a ________.
Element
Compound
Mixture
Suspension
9
Which of the following properties represents a physical change?
Ability of burn
reactivity with acids
resistance to bend
Ability to rust
10
Describe sublimation.
gas to solid
solid to liquid
liquid to solid
solid to gas
11
Which particle surrounds the nucleus in a cloud?
neutron
proton
electron
nucleus
12
Which is a physical change?
metal oxidizing
rocks crushing
garbage rotting
wood burning
13
If your needed 1 mole of aluminum, you would...
obtain 27 grams of aluminum
obtain 13 atoms of aluminum
obtain 13 grams of aluminum
obtain 27 aluminum pellets
14
Which is proof a chemical change occurred?
Condensation
gas released
boiling
dissolving
15
Which represents freezing and melting?
B
A
C
D
16
The smallest and lightest subatomic particle is the _____.
neutron
proton
nucleus
electron
17
If a color change occurs and a precipitate is formed...
a phase change occured
a chemical change occured
a physical change occured
the temperature decreased
18
Which describe current atomic theory?
atoms have an electron cloud and a positive nucleus
electrons move in orbits around the nucleus
electrons are evenly distributed through a mixture of protons and neutrons
atoms are made of only electrons
19
Which could be a heterogeneous mixture?
silver solution
redish/orange liquid
white crystals
gray and pink grains
20
Which type of matter could be filtered to separate?
Pure substance
Element
Mixture
Compound
