chem exam

Determine the charge on the unknown ion, A, in the compound ACl2

+2

How many electrons are in the 4p orbitals of vanadium?

0

How many moles are present in 17.4 g of lead?

0.0840 moles

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)2

0.305 mol

the density of mercury, the only metal to exist as a liquid at room temperature is 13.6 g/cm^3. what is that density in pounds per cubic inch? (1 inch= 2.54cm; 1 lb=454g)

0.491 lb/in^3

What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900

1.19 x 10^3

write the value 0.000000000143

1.43 x 10^-10

How many nitrate ions are in 24.4 grams of Ca(NO3)2?

1.79 x 10^23 nitrate ions

if a patient in the hospital is running a temp of 39.5 C, what is this in degrees fahrenheit?

103.1 F

Calculate the atomic mass of element ʺX,ʺ if it has 2 naturally occurring isotopes with the following masses and natural abundances. X-107 106.90509 amu 51.84% X-109 108.90476 amu 48.46%

108.19amu

The SI prefix nano-(n) means?

10^-9

How many neutrons are there in an atom of lead whose mass number is 208?

126

An aluminum ion, Al3+, has

13 protons and 10 electrons

what is the predicted O-C-O bond angle in CO2

180 degrees

The orbital diagram for a ground-state nitrogen atom is 1s 2s 2p A ↑↓ ↑↓ ↑ ↑ ↑

1s 2s 2p ↑↓ ↑↓ ↑ ↑ ↑

what is the electron configuration for bromine?

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element?

28.085 amu

Calculate the molecular mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

283.88 amu

what is the max number of p orbitals that are possible in a given shell?

3

what value of l is represented by an f orbital?

3

What is the mass of 0.0250 mol of P2O5?

3.55g

How many valence electrons does a carbon atom have?

4

how many significant figures are in 0.006570?

4

A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?

4.46 g/mL

Household sugar, sucrose, has the molecular formula C12H22O11. What is the % of carbon in sucrose, by mass?

42.1%

How many electrons are there in the 3rd principal energy level (n = 3) of a phosphorus atom?

5

If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3ft=1yd)

7.1 gallons

Which element has the following ground-state electron configuration? 1s2 2s2 2p6 3s2 A) Mg B) Na C) Ne D) Al E) Si

A

Which isotope is not possible? A) 25 54 Mn B) 52 24Cr C) 1 1 H D) 2 1 H E) All of these isotopes are possible

A

Which of these atoms has the smallest radius? A) P B) Na C) Al D) As E) Te

A

All statements about scientific theories are true EXCEPT A) they are derived from hypothesis. B) they are speculation. C) they must have the ability to make predictions on future behavior. D) they should use observations to test the theory. E) they explain why nature behaves the way it does.

B

Atoms X, Y, Z, and R have the following nuclear compositions: 410 186 X I 410 183 Y II 412 186 Z III 412 185 R IV Which of the following are isotopes of the same element? A) III & IV B) I & III C) I & II D) II & IV E) I & IV

B

Select the element that will lose an electron most easily, based on the periodic trend. A) P B) Na C) Ar D) Mg

B

What species is represented by the following information? p+ = 17 n° = 18 e- = 18 A) Ar B) Cl- C) Ar+ D) Cl E) Kr

B

Which of the following statements about subatomic particles is TRUE? A) Neutrons and electrons are found in the nucleus of an atom. B) A neutral atom contains the same number of protons and electrons. C) Protons and neutrons have opposite, but equal in magnitude, charges. D) Protons have about the same mass as electrons. E) Electrons make up most of the mass of an atom.

B

Which of the following statements is TRUE? A) An orbital is the path that a proton follows during its movement in an atom. B) The magnetic quantum number (ml) describes the orientation of the orbital in a 3-D coordinate system. C) The angular momentum quantum number (l) describes the the size and energy associated with an orbital. D) The principal quantum number (n) describes the shape of an orbital. E) All of the above are true.

B

Using the periodic table, predict the charge on the common ion of bromine. A) +1 B) +2 C) −1 D) −2

C

What element is defined by the following information? p+ = 11 n° = 12 e- = 11 A) vanadium B) titanium C) sodium D) magnesium

C

Which element would be expected to have properties similar to argon? A) Cl B) Br C) Kr D) F E) H

C

Which ion is isoelectronic with Ar? A) Fe2+ B) Ga3+ C) Ca2+ D) F− E) Br−

C

Which of the following is a metal? A) Nitrogen, N, Z = 7 B) Thallium, Tl, Z = 81 C) Arsenic, As, Z = 33 D) Phosphorus, P, Z = 15 E) Silicon, Si, Z = 14

C

Which of the following is a nonmetal? A) Mercury, Hg, Z = 80 B) Sodium, Na, Z = 11 C) Bromine, Br, Z = 35 D) Lithium, Li, Z = 3 E) Bismuth, Bi, Z = 83

C

which one of these elements is a transition metal element? A- Sr B- Pb C- Fe D- As E-H

C

what the empirical formula of a compound that is 52.15 percent C, 13.13 percent H, and 34.73 percent O?

C2H6O2

What species is represented by the following information? p+ = 12 n° = 14 e- = 10 A) Si4+ B) Si C) Mg D) Mg2+ E) Ne

D

Which of the following is a metalloid? A) Iridium, Ir, Z = 77 B) Sulfur, S, Z = 16 C) Bromine, Br, Z = 35 D) Germanium, Ge, Z = 32 E) Carbon, C, Z = 6

D

Which of these elements has the greatest metallic character? A) Mn B) Ge C) F D) Sc E) Br

D

Which one of these elements is a transition element? A) Sulfur B) Sodium C) Tin D) Nickel E) Calcium

D

What is the formula for the ionic compound formed by calcium ions and nitrate ions? A) Ca3N2 B) CaNO3 C) Ca2NO3 D) Ca2NO2 E) Ca(NO3)2

E

Which of these compounds is most likely to be ionic? A) SF4 B) CO C) SO2 D) NCl3 E) BaCl2

E

Which one of these ions has the smallest radius? A) S2− B) O2− C) Cl− D) K+ E) Na+

E

the elements in group 7A are known as ___

Halogens

Place the following in order of increasing electronegativity. Se K Cl

K<Se<Cl

what is the formula for lead (II) oxide?

PbO

Select the correct electron configuration for Te (Z = 52).

[Kr]5s^24d^105p^4

an atom that has lost an electron is ___

a cation

the elements in a column of the periodic table are known as

a group/family

the elements in group 2A are ___

alkaline earth metals

the vertical height of a wave is called ____

amplitude

Predict the molecular geometry and polarity of the SO2 molecule.

bent, polar

What does ʺXʺ represent in the following symbol? 80 35 X

bromine

When waves of equal amplitude from two sources are out of phase when they interact, it is called

destructive interference

When a wave encounters an obstacle or a slit that is comparable in size to its wavelength, it passes through and creates a semi-circle pattern on the other side of the barrier. This characteristic is called ____

diffraction

ions differ from atoms in their number of __

electrons

True Or false The rusting of a piece of iron under environmental conditions is a physical change.

false

In the periodic table, atoms are arranged in order of ___

increasing atomic number

The general electron configuration for noble gas atoms is

ns2np6

Determine the number of protons, neutrons and electrons in the following. 25 12X

p+=12 n=13 e-=12

Identify the charges of the protons, neutrons, and electrons.

p=+1 n=0 e=-1

Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37

p=17 e=17 n=20

Determine the number of protons, neutrons and electrons in the following. 40 18X

p=18 n=22 e=18

The atomic number (Z) is the number of ________ found in the nucleus of an atom.

protons

Identify the description of an atom:

protons and neutrons in nucleus; electrons in orbitals

Which ground-state atom has an electron configuration described by the following orbital diagram? [Ar] ↑↓ 4s ↑↓ ↑↓ ↑↓ 3d ↑↓ ↑ ↑ 4p

selenium

give the hybridization for the C in HCN

sp

give the hybridization for the S in SF6

sp3d2

What is the name of P4Se3?

tetraphosphorus selenide

Rutherford's Gold Foil Experiment helped prove:

that the mass of an atom is concentrated in a very small space

A covalent bond is best described as

the sharing of electrons between atoms

The mass number is equal to

the sum of the number of protons and neutrons

the name for SnO

tin (II) oxide

what is the shortest bond?

triple covalent bond

true or false The juice from an orange is a mixture.

true

what types of elements undergo covalent bonding

two nonmetals

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?

valence electrons