Chem 121 FInal

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What is the pressure today in atm if the weatherman says the current pressure today is 742 torr?

0.976 atm

How many moles of CO2 are produced when 2.5 moles of O2 react according to the following equation? C3H5 + 5 O2 → 3 CO2 + 4 H2O

1.5

How many moles of CO2 are produced when 2.5 moles of O2 react according to the following equation? C3H5+5O2-->3CO2+4H2O

1.5

prepared by dissolving .750 mol CaCl2 in enough water to make 0.500L

1.50 M

an imaginary element X consists of two isotopes having masses of 141 amu and 143 amu. A sample of X what found to contain 20% of the 141X isotope and 80% of the 143X isotope. Calculate the atomic weight of X.

142.6 amu

How many mL of 0.360 M HNO3 are needed to neutralize a 22.5 mL sample of 0.240 M KOH?

15.0 mL

The number of grams in 7.0 moles of N2 is

196

How many grams of NaOH are needed to make 750mL of a 2.5% (w/v) solution?

19g

what is the electron configuration of S?

1s2 2s2 2p6 3s2 3p4

When the reaction shown is correctly balanced, the coefficients are, _______HBr + +______Ca(OH)2 ---> _____CaBr2 + _____H2O

2,1,1,2

Which of the following pH's corresponds to a strongly to acidic solution?

2.1

How many moles of NaHCO3 are present in a 2.0g sample?

2.38x10^-2

if the concentration of H30+ is 3.5x10^-3 M, the concentration of OH- is _____ M.

2.9x10^-12

How many mL of 16M NH3are needed to prepare 2.00L of a 2.00 M solution?

250mL

consider the balanced equation shown and identify the statement that is not true. Na2SO4(aq) + BaCl2(aq) ---> 2Nacl(aq) + BaSO4(s)

2NaCl could also be written as Na2Cl2

what is the density of a substance with a volume of V=26.2cm3 and a mass of m=94.9g?

3.62g/cm3

which measurement represents the smallest quantity?

3740nm

The [H3O+] in a solution with pH=6.35 is

4.5x10^-7 M

A sample of gas has a volume of 135 mL at 0.600 atm. What would be the volume if the pressure is decreased to 0.200 atm while temperature is held constant?

405 mL

How many mL of 0.105 M AgNO3 are needed for an experiment that requires 0.00510 mol of AgNO3?

48.6mL

A sample of helium has a volume of 480 mL at 47.0°C and 740 mm Hg. The temperature is lowered to 22.0°C and the pressure to 625 mm Hg. What is the new volume?

524 mL

the molar mass of butane, C4H10, is ____ grams.

58.12

How many electrons can the occupy 2p subshell?

6

find the difference between two masses measured as 146.5g and 139.983g.

6.5g

a thimble of water contains 4.0x10^21 molecules. The number of moles of H2O is

6.6x10^-3

Consider the reaction shown: N2 + O2 → 2 NO ΔH = +43.2 kcal When 50.0 g of N2 react, ________ kcal will be ________.

77.1; consumed

Xylene a compound with the formula C8H10 is composed of

8 carbon atoms and 10 hydrogen atoms

What is 0.0970 written in scientific notation?

9.70 x 10^-2

Calculate the volume of a 3.50 mol sample of carbon dioxide at 30.0 ºC and 0.900 atm.

96.7 L

When a liquid sample is taken from sea level to a higher elevation, what happens to the external (atmospheric) pressure on the liquid and the boiling point of the liquid?

Both decrease.

in the reaction below, the conjugate acid of CH3COO- is CH3COO- +H2CO3 <---> CH3COOH +HCO3^-

CH3COOH

what is the formula for the ionic compound formed between calcium and nitrate?

Ca(NO3)2

Which of the following is a non-metal?

Cl

which of the following is a non-metal?

Cl

what is the typical net ionic equation for an acid-base neutralization of KOH and HCl?

H+(aq)+OH-(aq) --> H2O(l)

Rank the following in increasing order of boiling point: H2, NH3, CCl4, H2Se

H2 < CCl4 < H2Se < NH3

which of the following structures is likely to exist?

H2CO

which reaction is an example of an acid base reaction?

H2SO4(aq)+Ca(OH)2(aq) ---> CaSO4(aq) +2H2O(l)

which of the following is the strongest acid?

H3PO4 (Ka=7.5x10^-3

What element is most likely to have chemical properties similar to those of bromine?

I

Which of the following is not soluble in water?

Iron(III) Hydroxide

which pair of elements is most likely to form an ionic compound

K and Br

the Spectator ions in the reaction shown are 2AgNO3(aq)+K2SO4(aq) --> 2NO3(aq)+Ag2SO4(s)

K+, NO3-

which of the following is a strong base?

KOH

which symbol does not denote a compound?

Kr

What are the strongest intermolecular forces between C5H12 molecules?

London dispersion forces

which of the following elements is most likely to form an ion with a +2 charge?

Mg

Which one of the following will act as a strong electrolyte in an aqueous solution

NH3

If "A" contains 0.20 M NaCl and is separated by a semipermeable membrane from "B" which contains 1.0 M NaCl, which event will occur?

NaCl will flow from B to A

of the following substances, which would form a basic solution when dissolved in water NH4Cl, Ba(NO3)2, K2CO3, NaF

NaF, K2CO3

In the reaction shown, _____ is oxidized and becomes ______. Ni(s)+CuCl(aq) ---> Cu(s)+NiCl2(aq)

Ni, Ni+

which of the following would be miscible with carbon tetrafluoride, CF4?

O2

which of the following compounds can be most accurately described as a covalent molecule?

PF3

what is the formula for the phosphate ion

PO4^3-

Which of the following conditions characterizes a system in a state of chemical equilibrium?

Reactants are being consumed at the same rate they are being produced.

although noble gasses do not normally form covalent compounds, XeO3, has been prepared. the systematic name of the compound is

Xenon trioxide

Write the equilibrium expression for the following reaction: 2 BrF5(g) ⇄ Br2(g) + 5 F2(g)

[Br2][F2]5/[BrF5]2

Which of the following contains potential energy?

a book on a table

an increase in solution pH corresponds to

a decrease in hydronium ion concentration and an increase in hydroxide ion concentration

A necessary requirement for a bronsted-lowry base is

a lone pair of electrons in its lewis dot structure

identify the reactants in the following reaction, calcium carbonate --> calcium oxide + carbon dioxide

calcium carbonate

All of the statements regarding "ΔH" are correct except it

can be called the entropy change.

A positively charged particle formed by the loss of one or more electrons from an atom is called a

cation

the name of Cl- is

chloride ion

table salt NaCl is a _______ and is found in the ______ phase

compound, solid

Adding one neutron to the nucleus of an atom

converts it to an isotope of the same element

Which change to the system below would cause equilibrium to shift to the right? 4 NH3(g) + 3 O2(g) ⇄ 2 N2(g) + 6 H2O(g) ΔH = -1531 kJ

decreasing the concentration of oxygen

In the reaction A + B → AB, which of the following will not increase the rate?

decreasing the temperature

In the reaction energy diagrams shown below, the reaction on the left is ___________, and it occurs ___________ the reaction on the right.

exergonic; faster than

Main group elements that are non-metals usually _______ one or more electrons to form ________ which have a _______ charge

gain, anions, negative

The amount of energy involved in melting a substance without changing its temperature is called the

heat of fusion

According to Avogadro's Law, the volume of a gas will ________ as the ________ is increased while the ________ are held constant.

increase; number of moles; pressure and temperature

a molecule in which the central atom forms two single bonds and has two lone pairs is said to have a _______ shape

linear

which group contains only elements which normally exist as diatomic molecules?

nitrogen, oxegen, fluorine

The classification of an acid or a base as weak or strong is determined by

none of the above

water can be dissolved in which type of compounds?

polar and ionic compounds

For the process of vaporization, the sign of ΔH is _________ and the sign of ΔS is _________.

positive, positive

Protons possess a ________ charge, and neutrons possess a ________ charge.

positive, zero

Which of the following conditions characterizes a system in a state of chemical equilibrium?

reactants are being consumed at the same rate they are being produced

A chemical bond formed when two atoms share one pair of electrons is a _______ bond; it is best described as _____.

single, covalent

Which of the following can affect the activation energy (Eact) of a reaction?

use of a catalyst

Which description best fits a gas?

volume and shape of container; no intermolecular attractions

which is not an example of a solution?

whole milk

adding solute to a solution will increase which of the following

boiling point and osmotic pressure

which solution has the greatest osmolarity?

0.1 M AlCl3

In a precipitation the precipitate can be identified by the symbol

(s)

which of the following has three sig figs?

0.0250

The [OH-] and the pOH of 0.035 M KOH are, respectively,

0.035 M and 1.46

Which statement about solubility is not true?

additional solute added to a saturated solution will fully dissolve


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