stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
CHEM 101 Test 3 Review- Spring 2021 Flashcards | StudBud
Explore
/
CHEM 101 Test 3 Review- Spring 2021
CHEM 101 Test 3 Review- Spring 2021
29 terms
·
StudBud Administration
·
19 plays
Imported from external platform
Flashcards
29 cards
F
Practice quiz
P
Host live
L
Questions
29
Answers
1
Calcium hydroxide, Ca(OH)
2
, and Nickel (II) sulfide, NiS
Both soluble in water
Ca(OH)2 is not soluble, but NiS is
Both insoluble in water
Ca(OH)2 is soluble, but NiS is not
2
Put most simply, 1 mole equals
6.02 x 1023 units
1 molecule
6.02 x 10-23 items
6.02 x 1023 atoms
3
What do you reference when you need to figure out if something is a precipitate?
A list you had to memorize
The periodic table
Avogadro's number
Solubility rules
4
What's the first thing you check for when given a chemical equation?
What molar ratios can I make?
Did they use this on Breaking Bad?
Is it balanced?
What type of reaction is it?
5
Neutralization is a subclassification of what type of reaction?
Decomposition
Combustion
Synthesis
Metathesis
6
Sometimes, the empirical formula and molecular formula of something can be the same
False
True
7
How many molecules are in two moles of hexane?
1
2
1.20×1024
6.02×1023
8
Molecular formula is the simplest ratio of elements in a molecule
True
False
9
Where can you NOT find the molar mass of an element?
Avogadro's number
The Internet
A chemistry textbook
Periodic table
10
Given the molecular formula C
8
H
14
O
8
, what is this compound’s empirical formula?
CHO
C8H14O8
CH2O
C4H7O4
11
Given the following reaction, which of these is the precipitate? NaCl + AgNO
3
→ AgCl + NaNO
3
NaCl
AgCl
NaNO3
AgNO3
12
Which of the following is considered evidence of a chemical reaction?
Temporary color change
Noticeable change in heat
Vapors off a beaker of boiling water
Something dissolving in solvent
13
You need conversion factors to solve mass-mass problems
True
False
14
In an
error-free
experiment, percent yield can NEVER be over 100%
True
False
15
Mass of AgBr (187.77 g/mol), given 2.96 g of FeBr
3
(295.55 g/mol)? __FeBr
3
(
s
) + __AgNO
3
→ __AgBr(
s
) + __Fe(NO
3
)
3
5.64 g AgBr
3.76 g AgBr
0.940 g AgBr
1.88 g AgBr
16
One mole of N
2
and one mole of Na
3
N both contain the same
Mass
Molar ratio
Number of molecules
Amount of nitrogen
17
The number 6.02 x 10
23
is attributed to whom?
Amedeo Avogadro
Ernest Rutherford
Daryl Avocado
Dmitri Mendeleev
18
Acid + salt makes water + base
True
False
19
What is the mass, in grams, of a single molecule of oxygen, O
2
?
1.66 × 10-24 g
5.32 × 10-23 g
1.88 × 1022 g
2.66 × 10-23 g
20
If 0.250 mol of P reacts with 0.625 mol of S, what's the empirical formula of the product?
PS3
P2S3
P2S5
P5S2
21
What is the classification of the following rxn? NaCl + AgNO
3
→ AgCl + NaNO
3
Combination
Double Replacement
Single Replacement
Decomposition
22
What do we need to find a molar ratio?
Data (ex: masses, volumes)
Dental charts
Avogadro's number
Balanced chemical equation
23
What is the coefficient of oxygen after balancing the following equation? __LiNO
3
(
s
) ⟶ __LiNO
2
(
s
) + __O
2
(
g
)
1
4
2
3
24
Define molarity
6.02 x 1023 molecules = 1 mole
Moles of solute per mL of solvent
Moles of solute per Liter of solution
Grams of a substance per mole
25
Which of the following is not a method to find the empirical formula of a compound?
Use exp'tl data from before & after a rxn
Use the molecular formula
Use percent composition of its elements
Use Avogadro's number
26
How do you calculate percent yield?
theoretical yield/actual yield x 100%
actual yield x theoretical yield / 100%
actual yield/actual yield x 100%
actual yield/theoretical yield x 100%
27
The unit of molar mass is g/mol
False
True
28
What are the numbers in front of chemicals called in a reaction?
Isotopes
Scaling factors
Coefficients
Stoichiometries
29
Which of the following is NOT a unit of concentration?
M
mol/L
g/mol
%
