Chemistry 1 Final Sp 2022

How many moles of KCl are there in 50.0ml 0.170 M of KCl?

0.00850 mol.

Determine the mass in grams of 3.75 x 1021 atoms of zinc (one mole of zinc is 65.39)

0.407 g

If you have 1 mol Xe and 1 mol F₂, how many moles of XeF₄ can you create in the following chemical reaction? Xe (g) + 2 F₂ (g) → XeF₄ (g)

0.5 mol

What volume in L of a 0.724 M NaI solution contains 0.405 mol of NaI ?

0.559 L

What volume in L of a 0.32 M Mg(NO₃)₂ solution contains 45 g of Mg(NO₃)₂ ?

0.95L

Draw the Lewis structure for SO₂ (by following the octet rule on all atoms) and then determine the number of nonbonding electron pairs on the central atom.

1 Pair

Which two of the four structures below are plausible resonance contributors for NNO? Assume the connectivity is as written.

1 and 4

How many moles of carbon monoxide are there in 36.55 g of carbon monoxide?

1.305

What is the mass in gram of NaCN in 120.0 ml 2.40 x 10^-5 M solution?

1.41 x 10-4 g NaCN.

Please calculate the volume of a gas sample with mass of 1.000 × 103 g and density of 1.027 g/L,

1000 / 1.027 = 973.7 L

A sample of 5.0 moles of nitrogen (N2) gas at STP occupies a volume of how many liters?

112 Liters

A particular vitamin's chemical formula has one cobalt atom. What is the molar mass of the vitamin if it contains 4.34% cobalt?

1357 g/mol

How many phosphorus atoms are contained in 158 kg of phosphorus?

158000 / 31 x 6.02 x 1023 = 3.07 × 1027 phosphorus atoms

How many mol of carbon atoms in 4 mol of C4H8O2?

16 mol

Calculate the answer for (513 x 0.0039) + 25.35 = ?

27.4

How many grams of a solution that is 5.2 % sucrose by mass are needed to obtain 18 g of sucrose?

346 g solution.

There are ________ electrons, ________ protons, and ________ neutrons in an atom of 132/54 Xe.

54, 54, 78

What mass in grams of aspirin C9H8O4 is produced from 57.6 g of C7H6O3 assuming 95.0% yield from the reaction of C7H6O3(s) + C4H6O3(s) → C9H8O4(s) + C2H3O2(aq)?

71.4 g C9H8O4(s)

If 10.0 g of Mg reacts with 60.0g of I2 in the reaction Mg(s) + I2(s)→ MgI2(s), and 57.84g MgI2 form, what is the percent yield?

88.1%

200.0 ml of a 0.600 M solution of KCl is diluted to 600.0ml, what is the new concentration?

: 0.200 M.

Which isotope has 45 neutrons? A) 80/36 Kr B) 80/35 Br C) 78/34 Se D) 34/17 Cl E) 103/45 Rh

B) 80/35 Br

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? A) H, Li B) Cs, Ba C) Ca, Sr D) Ga, Ge E) C, O

C) Ca, Sr

Write the chemical formula for cesium carbonate dihydrate.

Cs₂CO₃•2H₂O

Among Ca, K, Kr, Se and Pd, which element has the greatest tendency to form an anion?

Se

identify the element that corresponds to each of the following electron configuration and indicate the number of unpaired electrons for each. A) 1s2 2S2 , b) 1s2 2S2 2P4 , c) [Ar] 4s2 3d5 d) [Kr] 5s2 4d105p4

a. Be, 0 unpaired b. O, 2 unpaired c. Cr, 6 unpaired d. Te, 2 unpaired

What mass of gallium oxide, Ga2O3, can be prepared from 11.9 g of gallium metal? The equation for the reaction is 4Ga+3O2⟶2Ga2O3.

16.0 g

Draw the Lewis structure of XeF₂ and then determine the ideal bonding angle(s) of the central atom.

180*

Complete and balance the neutralization equation for the reaction below HNO₃(aq) + Ba(OH)₂(aq) →

2 HNO₃(aq) + Ba(OH)₂(aq) → Ba(NO₃)₂(aq) + 2 H₂O(l)

Which of the following contains the most moles of atoms? a) 1g He; b) 1g C; c) 1g U.

A) 1g He

Draw the Lewis structure of CH₃F and then determine if the molecule is polar or nonpolar.

Polar

If you obtain the number 0.045006700 on a calculator. If this number actually has four significant figures, how should it be written?

0.04501

Determine the amount in grams of KCl that exists in 20.3 g of a solution that contains 1.14% KCl in mass.

0.231 g KCl.

How many grams of AgCl will be formed when 60 mL of 0.500 M AgNO₃ is completely reacted according to the balanced chemical reaction: FeCl₃(aq) + 3 AgNO₃(aq) → 3 AgCl(s) + Fe(NO₃)₃(aq)

4.30 g AgCl

A sample of CH4O with a mass of 32.0 g contains how many molecules of CH4O?

6.02 x 10^23

Complete and balance the dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Al₂(SO₄)₃(s) →

Al₂(SO₄)₃(s) → 2 Al³⁺(aq) + 3 SO₄²⁻(aq)

Which of the following statements is the best describing the electronegativity in atoms? a)Electronegativity is what happens when an atom gains an electron to become an anion b)Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond.

B

When talking about the liter, which of the following is correct? A) It is the SI base unit for volume. B) It is equivalent to a cubic decimeter. C) It is slightly smaller than a quart. D) It contains 106 cubic centimeters. E) It is slightly smaller than a gallon

B) It is equivalent to a cubic decimeter.

Select from the following, only ________ is an extensive property. A) density B) volume C) boiling point D) freezing point E) temperature

B) Volume

Complete and balance the dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Cr(NO₃)₃(s) →

Cr(NO₃)₃(s) → Cr³⁺(aq) + 3 NO₃⁻(aq)

Complete and balance the dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Cr2(SO4)₃(s) →

Cr2(SO4)₃(s) → 2Cr³⁺(aq) + 3 SO₄²⁻(aq)

A sample of a hydrate of copper(II) sulfate is found to contain 36.08% by mass water. What is the formula of the hydrate?

CuSO₄･5 H₂O

Balance the following chemical equation (if necessary) for the combustion reaction of propane: C₃H₈(g) + O₂(g) → CO₂(g) + H₂O(g)

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

Among the compounds below, which will have an empirical formula C3H5O?

D)

Which of the following bonds is a nonpolar covalent bond? a)HF b) NF c) FCl d) FF

D) FF

Draw the Lewis structure of NO and then choose the appropriate formal charges for each of the atoms.

Formal Charge N= 0 O=0

Complete and balance the dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. HI(aq) →

HI(aq) → H⁺(aq) + I⁻(aq)

Please calculate a temperatures in Kelvins, K from a degrees Celsius 7°C.

K = °C + 273.15 = 280.15

What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass?

K2 SO3

What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass?

K2SO3

An aqueous solution of Mg(NO₃)₂ and NaOH generates the solid precipitate Mg(OH)₂. Please write the balanced net ionic reaction.

Mg2+ and 2OH- → Mg(OH)₂.

among the following elements P, Ar, Mg, Na, Si. Please give the correct order of atomic radius

Na > Mg > Si > P > Ar

Draw the Lewis structure of IF₅ and then determine its electron domain and molecular geometries

Octahedral/ Square Pyramidal

For each of the following pairs, indicate which element has the smaller first ionization energy: A) Ti, Ba B) Ag, Cu C) Ge, Cl D) Pd, Sb

a. Ba b. Ag c. Ge d. Pb

Arrange each of the following sets of atoms and ions, in order of increasing size: A) Se2-, Te2-, Se B) Co3+, Fe2+, Fe3+ C) Ca, Ti4+, Sc3+ D) Be2+, Na+, Ne

a. Se, Se2-, Te2- b. Co3+, Fe3+, Fe2+ c. Ti4+, Se3+, Ca d. Be2+, Na+, Ne

How many possible values for l and ml are there when a) n =3 and b) n=5?

a. l = 0,1,2 l=1, ml = -1, 0, 1; l =0, ml =0 l = 2, ml =-2,-1,0,1,2; b. l = 0,1,2,3,4 l =4, ml = -4,-3,-2,-1,0,1,2,3,4; l=3, ml = -3, -2, -1, 0, 1, 2, 3; l = 2, ml =-2,-1,0,1,2; l=1, ml = -1, 0, 1; l =0, ml =0.