Sanjac General Chemistry I CHEM1311 Exam Latest 2022

The statement, "In a chemical reaction, matter is neither created nor destroyed" is called

AThe Law of Conservation of Mass

BDalton's atomic theory

Cthe Scientific Method

DThe law of Multiple Proportions

 

Dalton's Atomic Theory states

Athat all elements have stable isotopes

Bthat matter is composed of small indestructible particles

Cthat the properties of matter are determined be the properties of atoms

Dthat energy is neither created or destroyed during a chemical reaction

 

 

Identify a liquid

Adefinite volume and definite space

Bdefinite volume and no definite shape

Cdefinite shape and no definite volume

Dno definite shape and no definite volume

 

A substance that can't be chemically broken down into simpler substances is

Aa homogeneous mixture

Ban element

Ca heterogeneous mixture

Da compound

 

A substance composed of two or more elements in a fixed, definite proportion is

Aa homogeneous mixture

Ba heterogeneous mixture

Ca compound

Da solution

A physical change

Aoccurs when iron rusts

Boccurs when sugar is heated into caramel

Coccurs when glucose is converted into energy within our cells

Doccurs when water is evaporated

 

A chemical change

Aoccurs when methane is burned

Boccurs when paper is shredded

Coccurs when water is vaporized

D occurs when salt is dissolved in water

 

Define kinetic energy

Aenergy associated with the temperature of an object

Benergy associated with the motion of an object

Cenergy associated with the force of an object

Denergy associated with the gravity of an object

 

The outside temperature is 35 C.  What is the temperature in K?

A-238 K

B308 K

C95 K

D31 K

 

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

A1.19 X 103

B1.187 X 103

C1.1868 X 103

D1.18680 X 103

 

Water is an example of

Aa compound

Ban element

Ca heterogeneous mixture

Da homogeneous mixture

 

Kelvin is a measure of

Atemperature

Bmass

Ctime

Dlength

 

The factor 0.01 corresponds to which prefix?

Adeka

Bdeci

Ccenti

Dmilli

 

If the temperature is 228°F, what is the temperature in degrees Celsius?

A442.4°C

B501°C

C108.9°C

D–45°C

 

The outside air temperature is 40°F, what is the temperature in Kelvin?

A313 KB

377 K

C281 K

D277 K

 

Identify the description of an atom.

Aneutrons and electrons in nucleus: protons in orbitals

Bneutrons in nucleus; protons and electrons in orbitals

Cprotons and neutrons in nucleus; electrons in orbitals

Dprotons and electrons in nucleus; neutrons in orbitals

 

The mass number is equal to

Athe sum of the number of the electrons and protons

Bthe sum of the number of the neutrons and electrons

Cthe sum of the number of protons, electrons and neutrons

Dthe sum of the number of protons and neutrons

 

The atomic number is equal to

Athe number of the protons

Bthe sum of the number of the neutrons and electrons

Cthe sum of the number of protons, neutrons and electrons

Dthe sum of the number of protons and neutrons

 

What element is defined by the following information?

  p+ = 20     n° = 20      e– = 20

Azirconium

Bcalcium

Cpotassium

Dneon

Give the symbol for silver

AS

BSi

CAr

DAg

 

Ions differ in the number of

Aelectrons

Bneutrons

Cprotons

Dneutrons and protons

 

Predict the charge that an ion formed from nitrogen would have

A1-

B6+

C3-

D3+

 

The atomic mass for cadmium is

A48

B112.41

C40.08

D20

 

How many moles of Kr are contained in 398 mg of Kr?

A4.75 X 10-3 moles Kr

B33.4 moles Kr

C2.11 X 10-4 moles Kr

D2.99 X 103 moles Kr

 

How many iron atoms are contained in 354 g of iron?

A2.62 X 1025 Fe atoms

B2.13 X 1026 Fe atoms

C4.69 X 1024 Fe atoms

D3.82 X 1024 Fe atoms

 

An atom of 25Mg contains ________ electrons.

A25

B37

C13

D12

 

How many neutrons are in manganese-54?

A25

B30

C29

D29.4

 

Identify an anion

Aan atom that has lost an electron

Ban atom that has gained an electron

Can atom that has lost a proton

Dan atom that has a neutron and a proton

 

How many electrons does the Se2-ion possess?

A32

B36

C4

D34

 

Give the number of protons in P3-

A18

B12

C19

D15

Which of the following elements is a metal?

ASb

BO

CBr

DAg

 

Which of the following elements is a halogen?

APo

BS

CI

DSn

 

Which of the following elements has chemical properties similar to tellurium?

Abromine

Blithium

Cnitrogen

Dsulfur

 

How many moles of potassium are contained in 200g of potassium?

A5.11 moles

B0.956 moles

C13.3 moles

D10.53 moles

 

Which of the following is equal to exactly i mole of atoms?

A6.00 g of carbon

B30.69 g of nickel

C12.01 g of carbon

D12.31 g of magnesium

 

An ionic bond is best described as

Athe sharing of electrons

Bthe transfer of electrons from one atom to another

Cthe attracton that holds the atoms together in a polyatomic ion

Dthe attraction between two nonmetal atoms

 

Give the name for SnO

Atin(I) oxide

Btin(II) oxide

Ctin(III) oxide

Dtin(IV) oxide

 

Give the name for KMnO4

Apotassium manganese tetraoxide

Bpotassium manganate

Cpotassium permanganate

Dpotassium permagnessium

 

Write the formula for copper (II) sulfate pentahydrate.

A Cu2SO3•H5

BCu2S•H2O

CCuS•5H2O

DCuSO4•5H2O

 

Give the name for P4O10

Aphosphorus(IV)oxide

Bdiphosphorus pentoxide

Cphosphorus oxide

Dtetraphosphorusdecoxide

 

Calculate the molar mass of Ca3(PO4)2

A87.05 g/mol

B215.21 g/mol

C310.18 g/mol

D279.21 g/mol

 

Calculate the mass percent composition of lithium in Li3PO4

A26.75%

B17.98%

C30.72%

D55.27%

 

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.

AC2H502

BC6H15O6

CC3H7O3

DC4H10O4

 

Determine the empirical  formula for a compound that is 36.86% N and 63.14% O by mass.

ANO

BN2O

CNO2

DN2O3

 

Identify the compound with ionic bonds

ANe

BCO

CKCl

DH2O

 

Which of the following is a molecular compound?

AKCN

BLiOH

CP4O10

DZnS

 

Which of the following exists as a diatomic molecule?

Aoxygen

Bcarbon

Clithium

Dkrypton

 

Identify the element that only exists as 2+

Acalcium

Bcesium

Clead

Dcarbon

 

Write the formula for the compound formed between aluminum and sulfur

AAl2S3

BAl3S

CAlS3

DAl2S