Chem final study

Which of the following has been test the LEAST and therefore is the LEASE reliable?
A) Hypothesis
B) Scientific law
C) Theory
D) All are equally reliable

HOW MANY of the following four quanitites contain TWO significant figures, no more and no less?
24 miles per hour
24 centimeters
10 decigrams per gram
24 eggs
A) 1
B) 0
C) 2
D) 4
E) 3

In a graduated cylinder, if the meniscus of the liquid level rests JUST BARELY ABOVE the line for 5.3 mL, and the next line up is at 5.4 mL, which of the following options is the best way to record this volume?
A) 5.31mL
B) 5.3mL
C) 5.35mL
D) 5.40mL
E) 5.30mL

If an atom that is originally uncharged GAINS three electons, it become _____ .
A) positively-charged
B) a different element
C) a different isotope
D) a molecule
E) negatively-charged

Given the following division probem: (6.626x10^-34)/(9.63x10⁸)=? What is the answer reported to the correct number of significant figures? (Assume both values are measured values.)
A) 6.88x10^-27
B) 6.882x10-⁴³
C) 6.88x10-²⁵
D) 6.88x10-⁴³
E) 6.9x10-⁴³

The study of matter that contains carbon is performed by a chemist in which branch of chemistry?
A) organic
B) inorganic
C) physical
D) biochemistry
E) analytical

For which of the following choices do the two symbols describe atoms with the same number of protons?
A) ¹⁴C, ¹⁴N
B) ¹²C, ¹³C
C) Both (a) and (b)
D) neither (a) or (b)

A pure substance that CAN be broken down into simpler substances through some sort of typical chemical reaction is _____.
A) a compound
B) an atom
C) an element
D) a solid
E) an isotope

HOW MANY of the following seven elements are spedded correctly and are diatiomic elements?
phosphorus
fluorine
sodium
oxigen
hydrogin
clorine
sulfer
A) 6 or 7
B) 0 or 1
C) 4 or 5
D) 2 or 3

For which of the following choices are the numbers arranged correctly from smallest to largest?
A) (Smallest) 2.11x10^-3, 0.0023, 3.04x10^-2 (largest)
B) (smallest) 0.0023, 2.11x10^-3, 3.04x10^-2 (largest)
C) (smallest) 2.11x10^-3, 3.04x10^-2, 0.0023 (largest)
D) (smallest) 2.11x10^-3, 3.04x10^-2, 0.0023 (largest)

How many electrons are in a 3s subshell that is only half filled?
A) 2
B) 3
C) 9
D) 1
E) 4

How many sugnificant figures are in the value "0.02050 millimeters"?
A) 5
B) 4
C) ambiguous unless converted to scientific notation
D) 6
E) 3

HOW MANY of the following terms are associated with METAL elements
noble gas
group 2A (orIIA)
conductor
malleable
A) 0
B) 4
C) 1
D) 3
E) 2

3x10³ m is the same as:
A) 3mm
B) 3cm
C) 3µm
D) 3km
E) 3Mm

If an intern made an error and gave a patient a does of 275µg rather than 275mg of a drug, then:
A) the patient received an underdoes by a factor of 10,000
B) the patient received an underdose by a factor of 1000
C) the patient received an overdoes by a factor of 1000
D) the patient received an overdose by a factor of 100
E) the patient received an underdoes by a factor of 100

How many significant figures are in the answer to the following problem?
(Assume all values used in the calculation are measured quantities.)

35.18x45.1
__________+ 0.12
11.0

A) 5
B) 4
C) 3
D) 2
E) 1

HOW MANY of the following compunds have a name that ends with -ide?
NaCN
NaOH
NaHCO₃
NaF
A) 3
B) 4
C) 0
D) 1
E) 2

Pure nitrogen in its natural form (at room temperature) exists as _____.
A) an anion
B) a cation
C) two atoms in a single bond
D) two atoms in a double bond
E) two atoms in a triple bond

In the compund Cr₂O₃, what is the charge on one of the Cr ions?
A) -3
B) +6
C) +2
D) +1
E) +3

In the "sepatartions" experiment, how many of the following reasons could explain a % salt value that was LOWER than expected?

· Some salt was removed with the iron filings in the iron removal step
· The salt was not dissolved completely, so any undissolved salt would be in the filter paper with the sand
· The sand was not in the oven long enough to remove all of its water, giving the salt a lower overall mass percentage.
· Sputtering of dry salt caused loss of salt out of the beaker during heating.
· The salt was not in the oven long enough to remove all of its water giving the salt a lower overall mass percentage.

A) 0 or 1
B) 4 or 5
C) 2 or 3

The correct formula for the compund aluminum bisulfate is _______.
A) Al(HSO₄)₂
B) Al₃HSO₄
C) AlHSO₄
D) Al(HSO₄)₃
E) Al(SO₄)₂

What is the electron configuation of the element scanduim (atomic number 21)?
a)1s²2s²3d¹⁰4f³
b)1s²2s²2p⁶3s²3p⁶4s³
c)1s²2s²2p⁶3s²3p⁶4s²3d¹
d)1s²2s²2p⁶3s²3p⁶3d³
e)1s²1p⁶1d¹⁰1f³

What is the correct name of an ionic compound made only from sulfur and calcium?
A) calcium sulfate
B) culfur calcium
C) calcium sulfide
D) sulfur calcide

Which of the following three dimensional molecules is polar?
A) CF₄, where C is the only central atom
B) both of these
C) neither of these
D) CH₂F₂, where C is the only central atom

HOW MANY of the following comounds have FORMULA UNITS as their smallest units?
CO₂
NaBr
PbF₂
CuO
A) 1
B) 2
C) 0
D) 3
E) 4

Which of the following groups of elements most likely form ANIONS when the become charged?
A) d-block
B) s-block
C) f-block
D) p-block

A centeral atom with BENT geometry has a bond angle about ____ degrees when they are ONLY THREE directions of electrons emanating from the centeral atom.
A) 120
B) 180
C) 109.5
D) 107
E) 105

Which of the following atoms is least likely to form an ion?
A) barium
B) phosphorus
C) silicon
D) bromine
E) manganese

HOW MANY of the following are isoelectronic with the electron configuration of the argon atom?
Ca²⁺
Al³⁺
P^3-
S²⁺
a) 0
b) 1
c) 2
d) 3
e) 4

Based strictly on periodic table position, which of the following has the highest electronegativity?
A) beryllium
B) magnesium
C) lithium
D) sodium

Which of the statements regarding the S-F bond is TRUE, if one of these atoms have 4.0 electronegativity while the other has 2.5 electronegativity? The S-F bond _____.
A) has a dipole pointing AWAY FROM the fluorine atom
B) has a dipole pointing AWAY FROM the silicon atom
C) is ionic
D) is nonpolar
E) has a dipole pointing AWAY FROM the sulfur atom

The acidic component of stomach acid (or gastric juice) is ____.
a) hydrochloric acid
b) H₂SO₄
c) acetic acid
d)HNO₃
e)phosphoric acid

In a particular experiment to prepare a compound, the theoretical yield is 34.7g. If the actual yield is 31.2g, what is the percent yield?
A) 11.1%
B) 89.9%
C) 0.899%
D) 1.11%
E) 111%

Which of the following compounds is NOT an acid?
a) H₂S
b) NaC₂H₃O₂
c) HClO₄
d) all of these are acids
e) none of these are acids

How many moles of H atoms are in 12.0 moles of CH₄?
a) 48.0
b) 6.02x10²³
c)1.00
d)12.0
e)3.00

Which of the following is a correctly balanced equation of combustion reaction?
a) CaCO₃--> CaO + CO₂
b) 4Fe +3O₂ --> 2Fe₂O₃
c) H₂SO₄ + 2NaOH --> 2H₂O + Na₂SO₄
d) Ca₂O₂ --> Ca₂ + O₂
e) none of these

What occurs when the ionic compound NaNO₃ dissolves in a lot of H₂O to form a solution?
A) H₂O is the solution
B) Na⁺ & NO₃^- ions are the solutes
C) NaNO₃ is the solute
D) Na⁺, N^3- & O^2- ions are the solutes
E) Na, N & O atoms are the solutes

A diprotic acid is a compound that
A) MUST accept two protons per molecule
B) can donate up to 2 protons per molecule.
C) MUST donate two H+ ions per molecule.
D) can accept up to 2H+ ions per molecule.

8.75 moles of ammonia contain how many ammonia molecules?
a) 8.75
b) 6.02x10²³
c)5.27x10²⁴
d) 8.75x10²³
e) cannot be determined

To balance the equation __C₈H_{18 (g)} + __O_{2 (g)} --> __CO_2(g) + __H₂O_(g) the correct coefficients in the blancks from left to right are:
A) 1,12.5,8,9,
B) 1,4,8,9
C) none of these
D) 1,1,1,1
E) 2,25,16,18

MOLARITY is defined as the numner of
A) mole of solute per liter of solvent added.
B) moles of solvent per liter of solute added.
C) moles of solute per liter of total solution
D) moles of solvent per liter of total solution

What is mater?

What is chemistry?

What are the states of matter?

What is physical change?

What is chemical change?

What is a diatomic molecule?

What is a triatomic molecule?

What is a polyatomic molecule?

what is a homoatomic molecule?

What is a heteroatomic molecule?

What is a pure substance?

What is an element?

What is a compound?

What is a mixture?

what is a homogeneous mixture?

What is a heterogeneous mixture?

On the periodic table colums are calls___.

On the periodic table rows are called __.

Positive ions are ___.

negative ions are ___.

What is the "octet" rule?

What is a chemical bond?

What is a covalent bond?

What is an ionic bond?

What is the VSEPR theory?

What is a polar covalent bond?

what is a nonpolar covalent bond?

Atoms with 1 to 3 valence electrons will tend to ____ electrons to get an octect

Atoms with 4 to 7 electrons will tend to ___ electons to get an octet.

What is the dipole moment?

What is electronegativity?

What is avogadros number?

What is theoretical yield?

What is experimental yield?

What is percent yield?

# moles solute=

What is arrhenius theory?

What is wrong with Arrhenius theory?

Bronsted-lowry theory (acids)

Bronsted-lowry theory (base)

Explain the pH scale

Explain the pOH scale

What is buffer?

What is the job of a buffer?