CHEM-1405, Tao Tao, Final Exam

Liquid krypton boils at 121 K. what is the boiling point on the Celsius scale?

-252°C

Medicines usually are dispensed in units of mg. What is the mass of a 50 mg able?

0.050 g

Which of the following symbols represents the neutron?

1/0 n

An unknown gas occupies a volume of 1.50 L at 21°C and 0.950 atm. If the mass is 2.01 g, what is the molar mass of the gas? (R=0.0821 atm*L/mol*K)

34.0 g/mol

Which of the following calculation is not correct according to the significant digits rules?

4.56 - 3.1 = 1.46

A solution with a pH of 4.3 has a [H⁺] of _______

4.8 x 10⁻⁵ M

Considering the limiting reactant, what is the volume of NO gas produced from 30.0 L of nitrogen gas and 20.0 L of oxygen gas? (assume constant conditions) N₂(g) + O₂(g) → 2NO(g)

40.0L

The formula for mustard gas used in chemical warfare is C₄H₈SCl₂. What is the percentage of chlorine in the compound? (C: 12.01; H 1.01; S: 32.07; C;: 35.45)

44.57%

The product of the following reaction would be _____ AgNO₃ + NaBr → _____ + _____

AgBr and NaNO₃

Which of the following compound is soluble in water?

AgNO₃

Which one of the following statements is NOT correct?

Air is a heterogeneous mixture.

Which of the following is an observed property of gases?

All of above

Which of the following statements is true regarding a covalent bond?

All of the above

What is the proper name of AlN?

Aluminum Nitride

Which of following formula is NOT correct?

Al₂O

Which of the following elements has the most metallic character?

Ba

Which pair of the solution with form a precipitate upon mixed together?

BaCl₂ and Na₂SO₄

Which of the following compound is NOT soluble in water?

BaSO₄

Consider the following liquids with similar molar masses. Predict which liquid has the strongest intermolecular attraction based on viscosity data.

Butyl alcohol (viscosity @ 20°C=2.95 centipoise)

Which of the following element will form an ionic compound with bromine has the formula XBr₂?

Ca

Which of the following is an alkaline earth metal?

Ca

Which of the following as an example of ionic crystalline solid?

Calcite, CaCO₃

Which of the following is NOT related to kinetic energy?

Cat sleeping on a tree.

Which of the following process' is a chemical reaction?

Combustion

Which of the following reaction is NOT a double replacement reaction?

Combustion reaction

Which of the following is an example of metallic solid

Copper Wire

Which of the following formula is chromium (III) oxide?

Cr₂O₃

Which of the following binary compounds is an ionic compound?

CsF

If 0.500 mol of copper combines with 0.250 mol of sulfur, what is the empirical formula of the copper sulfide product? (Cu: 63.55; S: 32.07)

Cu₂S

Butyric acid is the odor of rancid cheese. Calculate the empirical formula for butyric acid given its percent composition: 54.33% C, 9.15% H, and 36.32% O. (C: 12.01, H: 1.01; O: 16.00)

C₂H₄O

Which of the following is NOT an Arrehennius base in aqueous solution?

C₂H₅NH₂

A common name for galactose is cerebrose, or brain sugar. What is the molecular formula of galactose if the empirical formula is CH₂O, and the approximate molar mass is 180 g/mol? (C: 12.01; H 1.01; O: 16.00)

C₆H₁₂O₆

What type reaction is the following reaction? (NH₄)₂Cr₂O₇ → N₂ + H₂O + Cr₂O₃

Decomposition

Which of the following intermolecular force exist between CO₂ molecules? CO₂ is a nonpolar compound.

Dispersion forces

Which one of the following statement is correct about accuracy and precisions?

Good measurements should have both good accuracy and good precision.

Which of the following is a triprotic acid?

H₃PO₄

Which of the following process' is NOT a chemical reaction?

Ice melting

Which of the following is not a part in the scientific method?

Imagination

Which of the following decreases the pressure of a gas?

Increasing the volume

What is correct about human blood?

It's a buffer.

Which of the following elements will have an ionic charge of +1?

K

Which of the following pairs is NOT correctly matched?

Mg - alkali metal

Which of the following pairs is NOT correctly assigned about their atomic size?

Mg>Ca

Which of the following abbreviation is NOT correct in metric system unit?

Microliter - ml

What is the concentration of H₃O⁺ in 1.5 M H₂SO₄ solution?

More than 1.5 M but less than 3.0 M

Which of the following could be a conjugated acid-base pair?

NH₄⁺ and NH₃

What is the product of water reacted with Na?

NaOH + H₂

Which of the following pair are isoelectric?

Na⁺ and Fˉ

Ca(NO₂)₂ is call calcium nitrite, so the correct name of HNO₃ (aq) is ______

Nitric acid

Which of the following formula is dinitrogen tetroxide?

N₂O₄

Which of the following elements has the greatest first ionization energy?

O

Hydrogen has an electronegativity value of 2.1. Given the electronegativity of N, O, and P (3.0, 3.5, and 2.1, respectively), which of the following molecules has nonpolar bonds?

PH₃

Which of the following is NOT a solution?

Pulp orange juice

Which of the following types of electromagnetic radiation has the longest wavelength?

Radio waves

Which of the following elements is a nonmetal?

S

Which of the following elements will have an ionic charge of -2?

S

Which of following Lewis symbol is correct?

Sb (5 electrons)

Which of the following atoms has the biggest radius?

Si

The following reaction is a ________ ZN (s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g)

Single replacement reaction

Which of the following gases occupies 22.4 L at STP?

all of the above

Which product will be produced when water reacts with a nonmetal oxide?

an acid

Chlorine (Cl₂) is an example of ______________

an element.

Distillation can be used to separate components in a mixture based on differences in ______

boiling point.

What is the term for the amount of energy required to break a covalent bond between two atoms?

bond energy

What is the term for the valence electrons in a molecule that are shared?

bonding electrons

What kind of intermolecular forces exit in liquid water?

dipole-dipole interaction, dispersion force, hydrogen bonding (all of the above)

What is the term for the geometric shape formed by bonding and nonbonding electron pairs surrounding the central atom in a molecule?

electron pair geometry

Heat of fusion is related to the phase change:

from solid to liquid

Which of the following compounds will be strong electrolyte in aqueous solution?

hydrobromic acid

Which of the following is a general trend for the electronegativity of elements in the periodic table?

increases from left to right; increases from bottom to top

The degree of ionization of a strong acid ______

is 100%

In the definition of Bronsted-Lowry acid and base, a base _____

is a proton acceptor

The metric system unit for volume is _______

liter

The correct IUPAC name for MnO₂ is _______

manganese (IV) oxide

Classify the following type of stoichiometry problem: How many GRAMS of zinc must react with an excess volume of hydrochloric acid to yield 0.500 GRAMS of zinc chlorise?

mass-mass problem

Apply the like dissolves like rule to predict which of the following liquids or solids is immiscible with or insoluble in water.

methyl ethyl ketone, C₄H₈O

An example of heterogeneous mixture is ________

muddy river water.

What is the product when a metal reacted with an acid? Assume there is a chemical reaction takes place.

one salt and one gas

One of its orbitals has a shape as following, what is this subshell?

p

Which of the following about pH is not correct in aqueous solution?

pH = 0 for pure water

The pH of 1.0 M solution of 4 different solutions are listed. Which of those solutions could be a weak acid?

pH = 5 (largest number under 7)

The gas solubility will increase when ______

partial pressure increase, temperature decrease

In most elements, nucleus is composed of _______

protons and neutrons.

In the dilution of 1.0 mL of 0.10 M solution of HCl to a volume of 20.0 mL, what remains unchanged?

the moles of HCl in the solution

Iron is an example of ______

transition metal.

What is the molecular shape of an ammonia molecule, NH₃?

trigonal pyramidal

Which of the following is NOT a property of acid

turn red litmus paper blue

Which of the following is NOT the metric system unit?

°F

Which of the following pairs has isotopes?

¹⁴N, ¹⁵N

The diameter of the sun is 1,390,000 km. In scientific notation this is _______

1.39 x 10⁶ km

What is the mass of silver metal produced from 6.35 g of copper (G: 107.87: Cu: 63.55; N: 14.01; O: 16.00) Cu(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s)

21.6 g

What is the mass of water required to prepare 50.0 g of 10.0% sodium nitrate?

45.0 g

Which of the following orbitals has the highest energy?

4f

How many orbitals in a 'd' sublevel?

5

How many valence electrons does nitrogen atom have?

5

If hydrogen gas is collected over water at 20°C and 763 mm Hg, whas is the partial pressure of the H₂? The vapor pressure of water at 20°C is 17.5 mm Hg.

746 mm Hg

1.00 mol A and 1.00 mmol B reacted to form C. Which is the limiting reactant? A(g) + 2B(g) → 3C(g)

B

How mamny moles of helium occupy a volume of 5.00 L at 227.0°C and 5.00 atm? (R=0.0821 atm*L/mol*K)

0.609 mol

What is the concentration of sodium ion in a 0.3 M (Na₃PO₄) solution?

0.9 M

Which of the following equation have both numbers as exact number?

1 km = 1000 m

How many moles of water vapor, H₂O, react with 2 mol of charcoal, C, according to the balanced chemical equation? C(s) + H₂)(g) →᷂ CO(g) + H₂

1 mol

The coefficient for the balanced equation of following reaction would be _______ _C₃H₈ (g) + _O₂ (g) → CO₂ (g) + H₂O (g)

1, 5, 3, 4

If an atom is 0.120 nm in diameter, what is the scientific notation for this measurement expressed with the unit of meter? (1m = 10⁹ nm)

1.20 x 10ˉ¹⁰ m

How many atoms of krypton are in 2.50 mol of Kr gas?

1.51 x 10²⁴ atoms

What is the density of hydrogen sulfide gas, H₂S at STP? (H: 1.01; S 32.07)

1.52 g/L

What is the volume of oxygen gas at STP from the decomposition of 9.57 g of silver chlorate (191.32 g/mol)? (Ag: 107.87; CL: 35.45; O: 16.00) 2AgClO₃(s) → 2AgCl(s) + 3O₂(g)

1.68 L

Given the following figure, which of the measurements listed is the best estimate of the length of the aluminum rod

1.88 cm

What volume of oxygen gas reacts to produce 20.0 mL of chlorine gas (assume temperature and pressure remain constant.) 4HCl(g) + O₂(g) → 2Cl₂(g) + 2H₂O(g)

10.0 mL

A hypothetical element has two stable isotopes: one isotope has a mass of 106.9051 amu with an abundance of 48.183%, the other isotope has a mass of 108.9048 amu with an abundance of 51.825%. What is the average atomic mass of this element?

107.950 amu

What would you report for the total mass of three samples weighing 106.2 g, 33.15 g, and 0.028 g?

139.4 g

Which one of the following statement is NOT correct?

16/8O²ˉ has 8 electrons, 8 protons, and 8 neutrons

What is the molar mass of aspirin, C₉H₈O₄ (c: 12.01; H 1.01; O 16.00)

180.17 g/mol

Which is the correct electron configuration for 35/17Cl?

1s²2s²2p⁶3s²3p⁵

An unknown hydrate of Nickel chloride, NiCl₂ * XH₂O, is heated to give 21.8% water. What is the water of crystallization (X) for the hydrate?

2

What is the molarity when a 3 L solution containing 6 moles of solute?

2.0 M

A 5.00 L volume of methane gas is cooled from 298 K to 149 K. If the pressure remains constant, what is the final volume?

2.50 L

When convert the square inches into square centimeter, the unit factor is _______

2.54cm/1 in. x 2.54cm/1 in

What is the mass percent concentration for a solution containing 20 g solute and 80 g solvent?

20%

A runner runs the 100 m dash at 9.58 s. What was his average speed in miles/our for this distance? (1 km = 0.621 mi).

23.3

A sample of ammonia gas occupies 20.0 mL at 585 torr and 20.0°C. If the volume of the gas is 50.0 mL at 50°C, what is the pressure?

258 torr

What is the total number of valence electrons in one molecule of N₂O₃?

28

Which of the following reaction will NOT happen? Partially activity series Zn>Fe>H>Cu>Ag

2Ag + ZnBr₂ → 2AgBr +Zn

Predict the number of resonance structures for a sulfur trioxide molecule SO₃.

3

if 25.0 mL of 0.100 M Ca(OH)₂ is titrated with 0.100 M HNO₃, what volume of nitric acid is required neutralize the base? 2HNO₃ + Ca(OH)₂ → 2Ca(NO₃)₂ + 2H₂O

50.0 mL

The density of iron is 7.9 g/cm³. What is the volume of a 4.5 kg iron block?

570 cm³

How many significant digits in the measurement number 0.00204500?

6

How many valence electrons are in an oxygen atom and an oxide ion?

6 and 8, respectively

How many moles of oxygen atoms in 2 moles of KNO₃ formula units?

6 mol

If the pressure of 1.50 L of hydrogen gas at 100°C decreases from 0.500 atm to 0.115 atm, what is the final volume? Assume temperature remains constant

6.52 L

What volume of 0.25 M hydrochloric acid (HCl) solution contains 0.15 mol HCl?

600 mL

The vapor pressure of chloroform is 0.001 at -58°C; 0.526 atm at 43°C; 100 atm at 61°C; and 2.00 atm at 84°C. What is the normal boiling point of chloroform?

61°C

Calculate the heat required to convert 10.0 g of ice at 0°C to steam at 100°C. The specific heat of water is 1.00 cal/(g x °C); the heat of fusion is 80.0 cal/g, the heat of vaporization is 540.0 cal/g.

7.20 x 10³ cal

Room temperature is often take to be 25°C. What is this temperature in °F?

77°F

In an experiment, 5.585 g of iron metal reacts with 3.207 g of sulfur. Using the conservation of mass law, predict the mass of product. (Fe: 55.85; S: 32.07) Fe(s) + S(s) →᷂ FeS(s)

8.792 g

How many orbitals are possible for the energy level 3?

9

Sterling silver contains 925 part of silver and 75 part of copper by mass. What is the percent silver ins sterling silver?

92.5%

The decomposition of 1.500 g of potassium chlorate evolved 405 mL of oxygen gas. If the calculated voume of oxygen gas is 411 mL, what is the percent yield?

98.5%

Why does grinding solid crystals increase the rate of dissolving for a solid solute in water?

Smaller crystals have more surface area

Which of the following is a pure substance?

Sucrose

What is the electron pair geometry for a methane molecule, CH₄?

Tetrahedral

The correct IUPAC name for P₄O₁₀?

Tetraphosphorus decoxide

Which of the following represents the graph of volume versus temperature for a gas constant pressure?

The straight line starting at 0

Plum-Pudding model of atoms is postulated by ______

Thomson.

What is the electron pair geometry for a carbonate ion, CO₃²ˉ?

Trigonal Planar

Which of the following will increase when intermolecular force decrease?

Vapor Pressure

Which of the following pairs are reverse processes?

Vaporization and condensation

Which of the following is the electron configuration of Zn²⁺?

[Ar]3d¹⁰

When to making and store 500-mL stock solution, which flask should be used?

a 500-mL volumetric flask

Which of the following objects will cool the fastest from the same initial temperature, assuming you had equal masses of each?

a copper pot (c᷂ = 0.90 J/(g · °C))