Chemistry Semester 1 Exam

because the first energy level only contains the 1s sublevel, the number of elements in this period is 4 8 1 2

2

how many sig figs in 3.0 E 23

2

the spin quantum number that indicated that the number of possible spin states for an eelctron in an orbital 1, 2, 3, 4

2

The number of atoms in one mole of boron would be a. 6.02 E 22 b. 3.01 E 22 c. 6.02 E 23 d. 3.01 E 23

6.02 E 23

why do atoms have different isotopes

isotopes contain different # of neutrons and can, therefore, have different masses

The main energy levels of an atom are indicated by the

principal quantum numbers

7/3.7 in sig figs

2

How many sig figs in: 3.0 E 23 mol

2

Answer in sig figs 200 x 23.4

5000

what is the mass in grams of 2.57 E 25 atoms of Te (z=52)

5421.76 g

5.84 3 -7 m in nm

584

how many sig figs in 1010.20

6

valence charge of Ar

+1

valence charge of rb

+1

consider the elements Ca P Rb and Si. the order of their respective ion charges is a. 2,5,1,4 b. 2,15,1,14 c. +2, -3, +1, +- 4 d. -2, +3, +1, +-4

+2, -3, +1, +- 4

valence charge of al

+3

valence charge of c

-3

valence charge of n

-3

37 stones/m3 = ? g/ml

.24 g/ml

how many moles in 3.01 E 23 atoms of MgO

.5 mol

1200 m to miles

.746 miles

how many moles in .00750 g of Ag (z=47)

0.000694 mol

1.2 mg = ? g

0.0012

3.890/110 in sig figs

0.035

Answer in sig figs 3.890 / 110

0.035

How many sig figs in: 600 miles

1

how many sig figs in .0000000008

1

A volume of 1 milliliter is equivalent to a. 1 cubic centimeter. b. 1 gram. c. 1 liter. d. 10-1 cubic decimeters.

1 cubic centimeter

100 milliliters is equivalent to a. 1 hectoliter. b. 1 microliter. c. 1 centiliter. d. 1 deciliter.

1 deciliter

1 mole of boron would have a mass of (refer to box above) a. 6 grams b. 16.81 grams c. 10.81 grams d. 1 gram

10.81 grams

The liter is defined as a. 1000 m3. b. 1000 cm3. c. 1000 g3. d. 1000 c3.

1000 cm3

1.06 L of water is equivalent to a. 0.001 06 mL. b. 10.6 mL. c. 106 mL. d. 1060 mL.

1060 mL

molar mass of Sn

118.71 g/mol

65 rods/min = ? miles/hour

12.185 miles/hr

Chlorine has atomic number 17 and mass number 35. It has a. 17 protons, 17 electrons, and 18 neutrons. b. 35 protons, 35 electrons, and 17 neutrons. c. 17 protons, 17 electrons, and 52 neutrons. d. 18 protons, 18 electrons, and 17 neutrons.

17 protons, 17 electrons, 18 neutrons

18.2 ml to cm3

18.2 cm3

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is a. 0.0518 g/cm3. b. 19.3 g/cm3. c. 101.5 g/cm3. d. 483 g/cm3.

19.3 g/cm3

Using the periodic table, tell me the information about the following elements: All elements are in the first 30 except f and g. a. Period number of Carbon: _______________ b. Atomic number of Magnesium: _______________ c. Family name of Fluorine: _______________ d. Atomic mass of Silicon: _______________ e. Block name that Ti is in ________________ f. Element Symbol that Z=50 ________________ g. Third element in the Nobel Gases: ___________________

2 12 Halogens 28.0855 d block Sn Argon

what is the frequency of a photon with a wavelength of 1.5 e -9

2.053 e 17

250 nm in m

250 E -9

Convert -25ºC to the kelvin scale. a. -323.15 K b. -248.15 K c. 248.15 K d. 323.15 K

258.15 K

molar mass of Fe(OCl)4

261.645 g/mol

Answer 4.6 - 2 in sig figs

3

Answer in sig figs 7 / 2.3

3

How many sig figs in: 0.00000800 pg

3

The number of significant figures in the measurement 0.000 305 kg is a. 2. b. 3. c. 6. d. 7.

3

how many sig figs in 600.

3

find percent error the real answer is 3.76 g/cc you got 3.42 g/cc

3.76-3.42 ---------- = .09042 = 9.04 % 3.76

3658 ml = ? quarts

3.866

If 4.0 g of element A combine with 10. g of element B, then 12 g of element A combine with ____ g of element B. a. 10. b. 12 c. 24 d. 30.

30

Which of these measurements has been expressed to four significant figures? a. 0.0020 mm b. 0.0402 mm c. 30.00 mm d. 402.10 mm

30.00

how many electrons are needed to completely fill the fourth energy level a. 32 b. 8 c. 40 d. 18

32

How many sig figs in: 0.001058 kg

4

how many sig figs in 10.05

4

The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as a. 4.128 cm3. b. 4.12 cm3. c. 4.13 cm3. d. 4.1 cm3.

4.1 cm3

how many molecules are in .75 moles of CCl4

4.515 E 23

Calculate how many millileters of milk are in the 1.0 pint milk cartons. Use information from the front of this test.

473ml

6.6-2 in sig figs

5

How many significant numbers are in: 10.051 cm

5

(13.90-3.3) x 6.2 in sig figs

66

6.8 e -11 m in nm

680 nm

How many sig figs in: 101.0120 K

7

how many sig figs in .0010058

7

3 months = ? seconds

7,776,000

how many molecules are in 158 grams of AlPO4

7.8E23

777 nm in m

777 E -9

Answer in sig figs 78.5 + 0.2021 - 0.0599

78.6

78.51 + 0.2021 - 0.0599 in sig figs

78.65

how many electrons are in a period in which only the s and p sublevels are filled

8

Answer in sig figs 200.36+2.32-120.365

82.32

8.32 cg to mg

83/2 mg

Answer in sig figs 6.10 + 3.401

9.50

6.10+3.601 in sig figs

9.70

300 x 28.4 in sig figs

9000

what is the mass in grams of .56 moles of V(NO3)2

98 g

Which of these statements does not describe a measurement standard? a. Measurement standards avoid ambiguity. b. Measurement standards must be unchanging. c. A standard can be easily changed to suit the experiment. d. Confusion is eliminated when the correct measurement is applied.

A standard can be easily changed to suit the experiment

increasing frequency of color spectrum

BIV G YOR

Look at the samples provided and answer the following questions: Is Sample A homogenous or heterogeneous? __________________________ Is Sample B homogenous or heterogeneous? __________________________ What is the name of Item C? ____________________________________ What is the name of Item D? ____________________________________ Why would you choose Item D over a beaker? ________________________

Homogeneous Heterogeneous Test tube holder Erlenmeyer Flask Use a stopper

saying used to convert

KHDUDCM king henry doesn't usually drink chocolate milk

Name 3 fundamental qualities of science

Length, Meter Mass, Kilogram Time, Second

The density of a heat resistant tile on the space shuttle is 3.68 g/cm3. If the tile measures 8.00 cm by 15.0 cm by 0.30 cm, what is the mass of one tile?

M = DV = (3.68)(8*15*.3) = 132.48g

Which of these statements about units of measurement is not true? a. A unit compares what is being measured with a previously defined quantity. b. A unit is usually preceded by a number. c. Measurements can be compared without knowing their units. d. The choice of unit depends on the quantity being measured.

Measurements can be compared without knowing their units

group the following atoms in order of increasing electronegativity Pd, Mo, Ag, Sn, Xe, Sr, Zr

Xe, Sr, Zr, Mo, Pd, Ag, Sn, Xe

A mixture is a. a combination of pure substances bonded chemically. b. any substance with a uniform composition. c. a blend of any two or more kinds of matter, as long as each maintains its own unique properties. d. any group of elements that are chemically bonded to one another.

a blend of any two or more kinds of matter, as long as each maintains its own unique properties

It is easy to determine whether a substance is a metal if the substance is

a good electrical and heat conductor.

Because any element used in the cathode produced electrons, scientists concluded that a. all atoms contained electrons. b. only metals contained electrons. c. atoms were indivisible. d. atoms carried a negative charge.

all atoms contained electrons

According to the quantum theory of an atom, in an orbital

an electron's position cannot be known percisesly

The atomic number of neon is 10. The atomic number of calcium is 20. Compared with a mole of neon, a mole of calcium contains a. twice as many atoms. b. half as many atoms. c. an equal number of atoms. d. 20 times as many atoms.

an equal number of atoms

Plasma is the fourth state of matter. In the plasma state a. atoms gain electrons. b. atoms lose electrons. c. atoms form molecules. d. atomic nuclei break down.

atoms lose electrons

Which of the following statements is true according to modern atomic theory? a. Atoms of the same element may have different masses. b. Atoms may be divided in ordinary chemical reactions. c. Atoms can never combine with any other atoms. d. Cathode rays are composed of protons..

atoms of the same element may have different masses

Because most particles fired at metal foil passed straight through, Rutherford concluded that a. atoms were mostly empty space. b. atoms contained no charged particles. c. electrons formed the nucleus. d. atoms were indivisible.

atoms were mostly empty space

what is [xe] 6s2 4f14 5d20 6p3

bismuth

The state of matter that occurs at extremely low temperatures causing several atoms to fuse and form a 'super atom' is a/an a. Solid b. Bose-Einstein Condensate c. Plasma d. Gas

bose eistein condensate

A nonmetal is usually a. brittle. b. malleable. c. a good conductor. d. used to make jewelry.

brittle

The principles of atomic theory recognized today were conceived by a. Avogadro. b. Bohr. c. Dalton. d. Rutherford.

dalton

a position ion is called

cation

The metric unit for length that is closest to the diameter of a pencil is the a. micrometer. b. millimeter. c. centimeter. d. decimeter.

centimeter

The nucleus of an atom has all of the following characteristics except that it a. is positively charged. b. is very dense. c. contains nearly all of the atom's mass. d. contains nearly all of the atom's volume.

contains nearly all of the atom's volume

The rays produced in a cathode tube are a. unaffected by a magnetic field. b. deflected away from a negative plate. c. found to carry a positive charge. d. striking the cathode.

deflected away from a negative plate

The quantity of matter per unit volume is a. mass. b. weight. c. inertia. d. density.

density

Which of the following is an intensive property of matter? a. amount of energy b. density c. volume d. mass

density

Experiments with cathode rays led to the discovery of the a. proton. b. nucleus. c. neutron. d. electron.

electron

Most of the volume of an atom is occupied by the a. nucleus. b. nuclides. c. electrons. d. protons.

electrons

For an electron in an atom to change from the ground state to an excited state what must happen

energy must be absorbed

According to the law of conservation of mass, when sodium, hydrogen, and oxygen react to form a compound, the mass of the compound is ____ the sum of the masses of the individual elements a. equal to b. greater than c. less than d. either greater than or less than

equal to

the element that has the greatest electronegativity

fluorine

All of the following are SI units for density except a. kg/m3. b. kg/L. c. g/cm3. d. g/m2.

g/m2

If electrons in an atom have the lowest possible energies, the atom is in the

ground state

The symbols for units of length in order from largest to smallest are a. m, cm, mm, km. b. mm, m, cm, km. c. km, mm, cm, m. d. km, m, cm, mm.

km, m, cm, mm

If electromagnetic radiation A has a lower frequency than electromagnetic radiation B, then compared to B, the wavelength of A is

longer

A measure of the quantity of matter is

mass

Isotopes are atoms of the same element that have different a. principal chemical properties. b. masses. c. numbers of protons. d. numbers of electrons.

masses

electrons in which d sublevel is being filled have the properties of nonmetals metalloids gases metals

metals

The elements that border the zigzag line in the periodic table area. inactive. b. metals. c. metalloids. d. nonmetals.

mettaloids

what is [kr] 5s2 4d4

molybdenum

uranium has three common isotopes. if the abundance of 234 U is 0.01%, the abundance of 235 U is 0.71%, and the abundance of 238 U is 99.28%, what is the average atomic mass of uranium?

multiple percents by numbers add each up divide by 100 237.9783 average mass

The most common form of hydrogen has a. no neutrons. b. one neutron. c. two neutrons. d. three neutrons.

no neutrons

Argon, krypton, and xenon are

noble gases

The nucleus of deuterium contains one proton and a. two neutrons. b. one neutron. c. no neutrons. d. two electrons.

one neutron

All isotopes of hydrogen contain a. one neutron. b. two electrons. c. one proton. d. two nuclei.

one proton

The tritium atom consists of a. one proton, two neutrons, and two electrons. b. one proton, one neutron, and one electron. c. one proton, two neutrons, and one electron. d. two protons, one neutron, and one electron.

one proton, two neutrons, one electron

The set of orbitals that are dumbbell shaped and directed along the x, y, and z axes are called

p orbitals

In Rutherford's experiments, most of the particles a. bounced back. b. passed through the foil. c. were absorbed by the foil. d. combined with the foil.

passed through the foil

The atomic number of oxygen, 8, indicates that there are eight a. protons in the nucleus of an oxygen atom. b. oxygen nuclides. c. neutrons outside the oxygen atom's nucleus. d. energy levels in the oxygen atom's nucleus.

protons in the nucleus of an oxygen atom

Max Planck proposed that a hot object radiated energy in small, specific amounts called

quanta

The bottom two rows of the periodic table, also called the f block, is named the a. Halogens b. Alkali metals c. trasition metals d. rare earth metals

rare earth metals

One chemical property of matter is a. boiling point. b. texture. c. reactivity. d. density.

reactivity

Because excited hydrogen atoms always produce the same line-emission spectrum, scientists concluded that hydrogen

released photons of only certain energies

As the mass number of an element's isotopes of an element increases, the number of protons a. decreases. b. increases. c. remains the same. d. doubles each time the mass number increases.

remains the same

Because a few alpha particles bounced back from the foil, Rutherford concluded that they were a. striking electrons. b. indivisible. c. repelled by densely packed regions of positive charge. d. magnetic.

repelled by densely packed regions of positive charge

what is [kr] 5s1

rubidium

Whose series of experiments identified the nucleus of the atom? a. Rutherford b. Dalton c. Chadwick d. Bohr

rutherford

an atom is

smallest unit of matter

visible light, x ray, infrared, and radio waves all have the same a. energy b. wavelength c. speed d. frequency

speed

An electron for which n=4 has more ___ than an electron for which n=2 energy wave nature particle nature spin

spin

A compound is

substance made of two or more elements

The two most important properties of all matter are

taking up space and having mass

Oxygen can combine with carbon to form two compounds, carbon monoxide and carbon dioxide. The ratio of the masses of oxygen that combine with a given mass of carbon is 1:2. This is an example of a. the law of conservation of mass. b. Dalton's atomic theory. c. the law of conservation of energy. d. the law of multiple proportions.

the law of multiple proportions

Avogadro's number is a. the maximum number of electrons that all the energy levels can accommodate. b. the number of protons and neutrons that can fit in the shells of the nucleus. c. the number of particles in 1 mole of a pure substance. d. the number of particles in exactly 1 gram of a pure substance.

the number of particles in 1 mole of a pure substance

An atom is electrically neutral because a. neutrons balance the protons and electrons. b. nuclear forces stabilize the charges. c. the numbers of protons and electrons are equal. d. the numbers of protons and neutrons are equal.

the number of protons and electrons are equal

In each of the following measurements lable the quantity being measured. 1pt each EXAMPLE temperature 300K __________________ 22 ms __________________ 16 m3 __________________ 1.56 A __________________ 74 cm2

time volume current area

A line spectrum is produced when an electron moves from one energy level

to a lower energy level

Mendeelev predicted that the spaces in his periodic table represented

undiscovered elements

Noble gases are in Group 18, and are best known because they are

unreactive

the electrons available to be lost, gained, or shared when atoms form compounds are called a. electron clouds b. ions c. valence electrons d. d electrons

valence electrons