Answers on Chemistry – Chemistry Flashcards

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question
Which of the following is a chemical property?
answer

A) melting point

B) mass

C) flammability

D) volume

question
All of the following are examples of matter except
answer

 A) heat.

B) air.

C) water.

D) salt.

question

Which of the following is a physical property?

answer

A) flammability

B) conductivity

C) ability to support combustion

D) corrosiveness

 

question

Which is an example of matter?

answer

A) electrical current

B) conductivity

C) reactivity

D) plastic

 

question
Which of the following is a physical change?
answer

A) the rusting of iron

B) the condensation of water vapor

C) the baking of a potato

D) the explosion of nitroglycerin

 

question

Which of the following causes a chemical change?

answer

A) winding an alarm clock

B) metabolizing fat

C) slicing a tomato

D) digging a hole

question

Chemistry is important to the study of which of the following subjects?

answer

A) Geology

B) Biology

C) Astronomy

D) Physics

E) All of these

question

A chemist is given an unknown sample. Which observation is not a physical property?

answer

A) The sample is a colorless liquid.

B) The sample has an odor similar to gasoline.

C) The sample is flammable.

D) The sample size is 55 mL.

question

Which best describes the size and shape of a sample of gas?

answer

A) It has definite volume and definite shape.

B) It has definite volume, but shape is determined by the container.

C) Its volume is determined by the container, but it has a definite shape.

D) Volume and shape are both determined by the container.

question
Which factor determines the state of matter in which a substance exists?
answer

A) amount

B) color

C) density

D) odor

E) temperature

 

question

Which of the following are states of matter?

answer

A) solid

B) suspension

C) solution

D) precipitate

question

Which of the following is a pure substance?

answer

A) root beer

B) bleach

C) eggs

D) gasoline

E) neon

question

A pure substance

answer

A) always has the same elemental composition.

B) is composed of more than one element.

C) can be broken into its components by physical means.

D) is chemically inert.

question
Which of the following is a mixture?
answer

A) cough syrup

B) iron

C) helium

D) sodium hydrogen carbonate

question

Each symbol denotes an element except 

answer

A) Co.

B) CO.

C) Cu.

D) C.

question
Which of the following is an element
answer

A) fire

B) iron

C) salt

D) water

E) wine

 

question

What is the chemical symbol for chlorine?

answer

A) C

B) Ca

C) Cl

D) Cr

 

question

What is the chemical symbol for calcium?

answer

A) C

B) Ca

C) Cl

D) Cr

question
What is the chemical symbol for copper?
answer

A) C

B) Ca

C) Cl

D) Cr

question
What is the chemical symbol for chromium?
answer

A) C

B) Ca

C) Cl

D) Cr

 

question

The most common element by mass percent in the human body is

answer

A) carbon.

B) hydrogen.

C) oxygen

D) sulfur.

 

 

question

Xylene, a compound with the formula C8H10, is composed of

answer

A) any combination of atoms of carbon and hydrogen in a four to five ratio.

B) eight atoms of carbon and ten atoms of hydrogen.

C) eight atoms of calcium and ten atoms of helium.

D) ten atoms of carbon and eight atoms of hydrogen.

question

Which symbol does not denote a compound?

answer

A)

CO2

B) CCl4

C) C2H4

D) Cr

E) CaCO3

question

) Which element is not essential for human life?

answer

A) C

B) H

C) P

D) Pb

E) Ca

question

What is the symbol for tungsten?

answer

A) W

B) Tu

C) Sn

D) St

question

What element is represented by the chemical symbol K?

answer

A) kaolin

B) phosphorus

C) potassium

D) silver

question

What element is represented by the chemical symbol Ag?

answer

A) argon

B) arsenic

C) gold

D) mercury

E) silver

question

Of the elements listed, the most abundant by mass percent in the earth's crust is

answer

A) silicon.

B) aluminum.

C) hydrogen.

D) iron.

question

The formula for ammonia, NH3, represents a compound composed of

answer

A) one atom of nickel and three atoms of hydrogen.

B) one atom of nitrogen and three atoms of hydrogen.

C) three atoms of nitrogen and three atoms of hydrogen.

D) three atoms of nitrogen and one atom of hydrogen.

question

The formula for sodium carbonate, Na2CO3, represents a compound composed of

answer

A) two atoms of sodium, three atoms of carbon, and three atoms of oxygen.

B) two atoms of sodium, one atom of carbon, and three atoms of oxygen.

C) six atoms of sodium, two atoms of carbon, and six atoms of oxygen.

D) one atom of sodium and one atom of carbonate.

question

The formula for glucose, C6H12O6, represents a compound composed of

answer

A) six atoms of carbon, twelve atoms of hydrogen, and six atoms of oxygen.

B) six atoms of carbon, ten atoms of hydrogen, and four atoms of oxygen.

C) one atom of carbon, two atoms of hydrogen, and one atom of oxygen.

D) six atoms of carbon and six atoms of water.

question

Which chemical symbol represents a non-metal?

answer

A) Al

B) B

C) Ga

D) Si

E) P

;

question

Which chemical symbol represents a metallic element?

answer

A) Ar

B) Br

C) Ca

D) H

question

Which chemical symbol represents a metalloid?

;

answer

A) Al

B) B

C) Ga

D) Zn

question
How many meters are there in one kilometer?
answer

A) 10-3

B) 10-2

C) 10-6

D) 103

question

The measurement most likely to describe the amount of pain reliever in a headache tablet is

;

answer

;A) 1.5 kg.

B) 500 mg.

C) 1.00 mL.

D) 325 mg/mL.

question

Which measurement represents the largest quantity?

answer

A) 4730 ng

B) 4.73 ; 10-4;g

C) 4.73 ; 103;;g

D) 4.73 ; 10-6;kg

E) 47.3 mg

question

Which measurement represents the smallest quantity?

answer

A) 2950 ng

B) 2.95 ; 10-4;g

C) 2.95 ; 103;;g

D) 2.95 ; 10-6;kg

question

;

;

;Which of the following measurements has three significant figures?

;

;

answer

A) 1,207 g

B) 4.250 g

C) 0.006 g

D) 0.0250 g

question

What is the numerical value of 1.2 ; 1.222? Express your answer using the correct number of significant figures.

;

;

answer

A) 1.5

B) 1.47

C) 1.466

D) 1.4664

question

Which of the following numbers contains four significant figures?

;

;

answer

A) 230,110

B) 23,011.0

C) 0.23010

D) 0.0230100

E) 0.002301

question

What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures.

;

answer

A) 128 cm2

B) 1280 cm2

C) 1282.3 cm2

D) 1282.32 cm2

question

;In scientific notation, the number 185,000,000 is

;

answer

A) 185 ; 106.

B) 1.85 ; 106.

C) 1.85 ; 108.

D) 185 ; 10-8.

question

;In scientific notation, the number 0.0046 is expressed as

;

answer

A) 46 ; 10-3.

B) 4.6 ; 10-3.

C) 4.6 ; 10-2.

D) 4.6 ; 10-1.

question

What is 0.0970 written in scientific notation?

;

answer

A) 970 ; 10-4

B) 97 ; 10-3

C) 9.70 ; 10-2

D) 97.0 ; 10-2

question

;How many centimeters are contained in 12.5 inches?

A) 4.92 cm

B) 5.10 cm

C) 31.8 cm

D) 492 cm

answer

A) 4.92 cm

B) 5.10 cm

C) 31.8 cm

D) 492 cm

question

How many grams are contained in 1.20 pounds?

;

answer

A) 545 g

B) 378 g

C) 264 g

D) 2.2 g

question

How many quarts are contained in 450. mL?

;

answer

A) 0.426 quart

B) 2.10 quarts

C) 426 quarts

D) 475 quarts

E) 0.475 quarts

question

How many pounds are contained in 84.0 kg?

;

answer

A) 0.038 lb

B) 0.084 lb

C) 38.0 lb

D) 185 lb

question

68;C is the same as

;

answer

A) 341 K.

B) 321 K.

C) 285 K.

D) 205 K

question

What temperature is 325 K on the Celsius scale?

;

answer

A) 52;C

B) 126;C

C) 344;C

D) 598;C

question

95.0;F is the same as

;

answer

A) 21;C.

B) 35;C.

C) 85;C.

D) 171;C.

question

What temperature is 75;F on the Kelvin scale?

;

answer

A) 24 K

B) 43 K

C) 215 K

D) 297 K

question

What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing 50.0 g by 5.00 Celsius degrees?

answer

A) 250 cal/g ;C

B) 133 cal/g ;C

C) 6.63 cal/g ;C

D) 1.89 cal/g ;C

E) 0.106 cal/g ;C

question

What is the specific heat of a metal if it takes 48.4 calories to raise the temperature of a 45.0 g sample by 5.0;C?

;

;

answer

A) 0.186 cal/g ;C

B) 0.215 cal/g ;C

C) 5.34 cal/g ;C

D) 225 cal/g ;C

question

A 35.0 mL sample of a liquid weighs 27.2 g. What is the density of the liquid?

;

;

answer

A) 62.2 g/mL

B) 7.80 g/mL

C) 1.29 g/mL

D) 0.952 g/mL

E) 0.777 g/mL

question

What is the mass of 30.0 mL of a solution with a density of 1.60 g/mL?

answer

A) 53.3 g

B) 48.0 g

C) 31.6 g

D) 18.8 g

question

A 2.36 cm3;sample of an unknown metal weighs 18.5 g.; What is the sample's density?

 

 

answer

A) 7.84 g/cm3

B) 0.127 cm3/g

C) 15.75 g /cm3

D) 0.784 g/cm3

question

.  The smallest amount of an element that retains that element's characteristics is the

;

;

answer

A) atom.

B) electron.

C) molecule.

D) neutron.

E) proton.

question

Another name for atomic mass unit (amu) is the

;

;

answer

A) avogadro.

B) dalton.

C) Kekule

D) kelvin.

E) mendeleev.

question

. ;Which characteristics correctly describe a proton?

;

answer

A) approximate mass 1 amu; charge +1; inside nucleus

B) approximate mass 5 ; 10-4;amu; charge -1; outside nucleus

C) approximate mass 5 ; 10-4;amu; charge +1; inside nucleus

D) approximate mass 1 amu; charge 0; inside nucleus

E) approximate mass 1 amu; charge +1; outside nucleus

question

;Which particle has a mass approximately equal to the mass of a proton?

;

;

answer

A) atom

B) electron

C) neutron

D) nucleus

E) quark

question

.; Protons possess a ________ charge, and neutrons possess a ________ charge.

;

;

answer

A) negative, negative

B) negative, positive

C) positive, negative

D) positive, zero

E) zero, positive

;

question

Protons possess a ________ charge, and electrons possess a ________ charge.

;

;

answer

A) negative, negative

B) negative, positive

C) positive, negative

D) positive, zero

E) zero, positive

question

In a neutral atom the number of ________ is equal to the number of ________.

;

;

answer

A) protons, electrons

B) protons, neutrons

C) neutrons, electrons

D) protons + electrons, neutrons

E) none of the above

question

Where is most of the mass of an atom concentrated?

;

;

answer

A) electrons

B) neutrons

C) nucleus

D) orbitals

E) protons

question

An atom with Z = 26 and A = 58 contains ________ protons and ________ neutrons.

;

;

answer

A) 26; 58

B) 58; 26

C) 26; 32

D) 32; 26

E) 26; 84

question

;;An atom with Z = 35 and A = 80 contains ________ protons, ________ electrons, and ________ neutrons.

;

;

answer

A) 35; 35; 80

B) 80; 35; 35

C) 35; 35; 45

D) 45; 80; 45

E) 45; 80; 35

question

;How many neutrons does an atom of [image]Ti have?

 

 

answer

A) 0

B) 22

C) 24

D) 46

E) 68

question

The symbol of the element with 23 protons is

 

 

answer

A) Mg.

B) Na.

C) V.

D) B.

E) none of the above

 

question

An atom that contains 47 protons, 47 electrons, and 60 neutrons is an isotope of

 

 

answer

A) Ag.

B) Al.

C) Nd.

D) Bh.

E) cannot be determined from the information given

question

Cobalt is element 27.  Cobalt-60 is used in the medical treatment of cancer.  How many neutrons and protons are contained in the nucleus of this isotope?

 

 

answer

A) 27 neutrons, 33 protons

B) 33 neutrons, 27 protons

C) 27 neutrons, 27 protons

D) 33 neutrons, 33 protons

question

An imaginary element Xq consists of two isotopes having masses of 100.0 amu and 102.0 amu. A sample of Xq was found to contain 20.0% of the 100Xq isotope and 80.0% of the 102Xq. Calculate the atomic weight of Xq.

 

 

answer

A) 100.2 amu

B) 100.4 amu

C) 101.0 amu

D) 101.6 amu

E) 202.0 amu

question

An imaginary element Xz consists of two isotopes having masses of 100.0 amu and 102.0 amu. A sample of Xz was found to contain 75.0% of the 100Xz isotope and 25.0% of the 102Xz. Calculate the atomic weight of Xz.

 

 

answer

A) 100.3 amu

B) 100.5 amu

C) 101.0 amu

D) 101.5 amu

E) 101.8 amu

question

Which elements all belong in the same group?

 

 

answer

A) C, N, O

B) Fe, Cu, Ni

C) B, Si, As

D) F, Cl, Br

E) Al, Ge, Sb

question

 Elements in the Periodic Table are arranged according to

 

 

answer

A) alphabetical order.

B) atomic number.

C) atomic weight.

D) date of discovery.

question

Which element is not a semimetal?

 

 

answer

A) Al

B) Si

C) Ge

D) As

E) none of the above

question

Which group of elements contains only non-metals?

 

 

answer

A) Mg, Ca, Sr

B) V, Cr, Mn

C) Cl, Ar, K

D) P, As, Se

E) C, S, I

question

 Which of the following is an alkali metal?

 

 

answer

A) Al

B) Cl

C) He

D) Na

E) O

question

Magnesium is an example of a(an)

 

answer

A) alkali metal.

B) alkaline earth.

C) halogen.

D) noble gas.

E) transition metal

question

Which of the following elements is a noble gas?

 

 

answer

A) Cl

B) H

C) N

D) Ne

E) O

question

Which group contains only metalloids?

 

 

answer

A) Ni, Pd, Pt

B) Si, Ge, As

C) Ce, Pr, Nd

D) Kr, Xe, Rn

E) Po, Fr, Ac

question

Which group contains only noble gases?

 

 

answer

A) Ni, Pd, Pt

B) Si, Ge, As

C) Ce, Pr, Nd

D) Kr, Xe, Rn

question

Which column of the periodic table contains only nonmetals?

 

 

answer

A) 4A

B) 5A

C) 6A

D) 7A

question

 Which element is most likely to have chemical properties similar to those of bromine (atomic number 35)?

 

answer

A) S (atomic number 16)

B) Se (atomic number 34)

C) Kr (atomic number 36)

D) Te (atomic number 52)

E) I (atomic number 53)

question

 How many electrons can occupy the shell having n = 2?

 

 

answer

A) 2

B) 6

C) 8

D) 18

question

How many electrons can occupy the shell having n = 4?

 

 

answer

A) 2

B) 8

C) 10

D) 18

E) 32

question

How many electrons can occupy the 4s subshell?

 

 

answer

A) 1

B) 2

C) 6

D) 8

E) 10

question

How many electrons can occupy the 4d subshell?

 

 

answer

A) 1

B) 2

C) 6

D) 8

E) 10

question

At maximum, an f subshell can hold ________ electrons, a d subshell can hold ________ electrons and a p subshell can hold ________ electrons.

 

 

answer

A) 14, 10, 6

B) 2, 8, 18

C) 18, 8, 2

D) 2, 12, 21

E) 14, 6, 10

question

 What is the electron configuration of S?

 

 

answer

A) 1s2s2p2

B) 1s2s2p3s3p2

C) 1s2s2p3s3p4

D) 1s2s2p3s3p6

E) 1s2s2p3s3p4s3d1

question

What is the electron configuration of Mg?

 

 

answer

A) 1s2s2p8

B) 1s2s2p3s2

C) 1s2s2p3s3p3

D) 1s2s2p3s3p4s3d5

E) none of the above

question

The element with the electron configuration 1s2 2s2 2p4 is ________.

 

 

answer

A) Be

B) C

C) O

D) Si

E) S

question

What is the electron configuration of Fe?

 

 

answer

A) 1s2s2p3s3p3d8

B) 1s2s2p3s3p4s3d6

C) 1s2s2p3s3p4s4p6

D) 1s2s2p3s3p4s2

E) 1s2s2p3s3p3d6

question

 The ground state electron configuration for nickel is

 

 

answer

A) 1s2s2p3s3p3d10.

B) 1s2s2p3s4s3d10 4p4.

C) 1s2s2p3s3p4s4d8.

D) 1s2s2p3s3p4s3d8.

question

 The element with the electron configuration 1s2 2s2 2p6 3s2 3p5 is

 

 

answer

A) fluorine.

B) chlorine.

C) carbon.

D) potassium.

E) sulfur.

question

The number of valence electrons in an element with electron configuration

1s2 2s2 2p6 3s2 3p4 is ________.

 

 

answer

A) 2

B) 4

C) 6

D) 8

E) 16

question

The electron configuration for phosphorus is

 

 

answer

A) 1s1p2s2p5.

B) 1s2s2p3p5.

C) 1s2s2p3s3p1.

D) 2s2p3s3p5.

E) 1s22s22p63s23p3.

question

The number of valence electrons in a main group element is given by ________.

 

 

answer

A) the element's atomic number

B) the element's atomic weight

C) the element's group number

D) none of the above

question

Valence electrons in the main group elements are contained in which type(s) of orbitals?

 

 

answer

A) s

B) p

C) s and p

D) d

question

How many electrons are there in the valence shell of a nitrogen atom?

 

 

answer

A) 0

B) 2

C) 3

D) 5

E) 7

question

 The element which has four valence electrons is ________.

 

 

answer

A) H

B) Na

C) Mg

D) Si

question

A positively charged particle formed by loss of one or more electrons from an atom is called a(an)

 

 

answer

A) anion.

B) cation.

C) isotope.

D) nucleus.

E) proton.

question

A small negatively charged particle formed when an atom gains one or more electrons is called a(an)

 

answer

A) anion.

B) cation.

C) isotope.

D) nucleus.

E) proton.

question

When an atom donates an electron, that electron

 

 

answer

A) is lost for all time.

B) is acquired by another atom which becomes an anion.

C) is acquired by another atom which becomes a cation.

D) neutralizes a proton to form a neutron.

E) pairs with another electron to form a covalent bond.

question

Main group elements that are metals usually ________ one or more electrons to form ________, which have a ________ charge.

 

 

answer

A) lose; anions; negative

B) lose; cations; negative

C) lose; cations; positive

D) gain; cations; positive

E) gain; anions; negative

question

Main group elements that are non-metals usually ________ one or more electrons to form ________, which have a ________ charge.

 

 

answer

A) lose; anions; negative

B) lose; cations; negative

C) lose; cations; positive

D) gain; cations; positive

E) gain; anions; negative

question

One characteristic of a cation is that

 

 

answer

A) it has more protons than electrons.

B) it has equal numbers of protons and electrons.

C) it has more electrons than protons.

D) the number of neutrons is related to the number of electrons.

E) the relationship between protons and electrons varies with the cation in question.

question

The property that describes the ease with which an atom gives up an electron to form a positive ion is

 

 

answer

A) atomic number.

B) electron affinity.

C) electronegativity.

D) ionization energy.

E) none of the above

question

The property defined as the energy released on adding an electron to an isolated gas phase atom is

 

 

answer

A) atomic number.

B) electron affinity.

C) electronegativity.

D) ionization energy.

E) none of the above

question

Which of the following has the largest ionization energy?

 

 

answer

A) Ne

B) Br

C) P

D) Al

E) Ca

question

The property defined as the energy required to remove one electron from an atom in the gaseous state is

 

 

answer

A) atomic number.

B) electron affinity.

C) ionization energy.

D) electronegativity.

E) none of the above

question

An element belonging to the halogen family would be expected to have a ________ ionization energy and a ________ electron affinity.

 

 

answer

A) large; large

B) large; small

C) small;  small

D) small; large

E) none of the above

question

An element belonging to the alkaline earth family would be expected to have a ________ ionization energy and a ________ electron affinity.

 

 

answer

A) large; large

B) large; small

C) small; small

D) small; large

E) none of the above

question

The term which best describes the crystalline substance that results when a large number of metal atoms transfers electrons to a large number of non-metal atoms is

 

 

answer

A) covalent compound.

B) molecule.

C) ionic solid.

D) cation.

E) anion.

question

Which one of the compounds below is most likely to be ionic?

 

 

answer

A) SrBr2        

B) NO2          

C) CBr4

D) H2O

question

 Which of the following pairs will form ionic bonds with one another?

 

 

answer

A) N, C

B) Na, Ca

C) Cs, Br

D) S, Cl

question

Which of the following electron configurations is most stable?

 

 

answer

A) 1s2s2

B) 1s2s2p2

C) 1s2s2p3

D) 1s2s2p4

E) 1s2s2p6

question

What is the most likely charge on an ion formed by an element with a valence electron configuration of ns2np4?

 

 

answer

A) 2-

B) 1-

C) 2+

D) 4+

E) 6+

question

An atom with 3 valence electrons will most likely

 

 

answer

A) lose three electrons.

B) gain three electrons.

C) gain five electrons.

D) gain one electron.

E) lose one electron.

question

Which element will form an ion with the greatest positive charge?

 

 

answer

A) Al

B) Na

C) Mg

D) Sr

E) P

question

 The charge on a sulfide ion is ________.

 

answer

A) 3+

B) 2+

C) 0

D) 2-

E) 3-

question

Which pair of elements is most likely to form an ionic compound if allowed to react together?

 

 

answer

A) Al and Si

B) Fe and Ca

C) C and F

D) K and Br

E) H and N

question

 What fourth period element is represented by the dot structure shown?       X:

 

 

answer

A) K

B) Ca

C) V

D) As

E) Ti

question

What fourth period element is represented by the dot structure shown?      [image] 

 

 

answer

A) K

B) Ca

C) Mn

D) Br

E) Co

question

Which of the following elements is most likely to form an ion with a -2 charge?

 

 

answer

A) Mg

B) Si

C) S

D) K

E) Ti

question

The name of Cl- is

 

 

answer

A) chlorine ion.

B) chloride ion.

C) chlorate ion.

D) chlorite ion.

E) diatomic chlorine.

question

The name of S2- is

 

answer

A) sulfur.

B) sulfate ion.

C) sulfite ion.

D) sulfide ion.

E) sulfurous ion.

question

The name of Cu2+ is ________ ion or ________ ion.

 

 

answer

A) copper; cupric

B) copper(i); cupric

C) copper(II); cupric

D) copper(I); cuprous

E) copper(II); cuprous

question

The correct Roman numeral for the chromium ion in the compound CrCl3 is

 

 

answer

A) I

B) II

C) III

D) IV

question

The name of Sn2+ is ________ ion or ________ ion.

 

 

answer

A) tin; stannous

B) tin(IV); stannic

C) tin(II); stannic

D) tin(IV); stannous

E) tin(II); stannous

question

Which of the following formulas in incorrect for a cobalt(III) compound?

 

 

answer

A) CoCO3     

B) CoCl3

C) Co2O3

D) CoPO4  

question

 What is the formula of the ammonium ion?

 

 

answer

A) Am-

B) Am+

C) ) [NH4]+

D) [NH]4+

question

What is the formula of the carbonate ion?

 

 

answer

A) [CO2]3-

B) [CO3]2-

C) [C2O4]2-

D) [C2O4]1-

question

The formula PO4 3- means that this ion is composed of

 

 

answer

A) one atom of phosphorus, one atom of oxygen, and three extra electrons.

B) four atoms of phosphorus, four atoms or oxygen, and three extra electrons.

C) one atom of phosphorus,four atoms of oxygen, and three electrons have been lost.

D) one atom of phosphorus, four atoms of oxygen, and three extra electrons.

E) four atoms of phosphorus, four atoms of oxygen, and three electrons have been lost.

question

The permanganate ion is composed of

 

 

answer

A) one atom of magnesium, four atoms of oxygen, and one extra electron.

B) one atom of manganese, four atoms of oxygen, and one extra electron.

C) four atoms of magnesium, four atoms of oxygen, and one extra electron.

D) four atoms of manganese, four atoms of oxygen, and one extra electron.

E) one manganese(II) ion, four oxide ions, and two extra electrons.

question

Which is the correct formula for the ionic compound containing iron(III) ions and oxide ions?

 

 

answer

A) FeO

B) FeO2

C) Fe2O2

D) Fe2O3

E) Fe3O2

question

What is the formula for the ionic compound formed between calcium and sulfur?

 

 

answer

A) CaS

B) CaSi

C) Ca2S

D) CaS2

E) CaSi2

question

What is the formula of a compound formed by the ions M2+ and X3-?

 

 

answer

A) M2X3

B) M3X2

C) MX3

D) M2X

E) none of the above

question

What is the formula of a compound formed by the ions M+ and X3-?

 

 

answer

A) MX3

B) M3X

C) M3X3

D) M2X6

E) none of the above

question

If an element G could react with sulfur to form an ionic compound with formula GS2, the charge on the ion formed by G would be ________.

 

 

answer

A) 4-

B) 2-

C) 1+

D) 2+

E) 4+

question

 A formula unit of the ionic compound copper(II) carbonate consists of ________ copper(II) ions and ________ carbonate ions.

 

 

answer

A) one; one

B) one; two

C) two; one

D) two; two

E) some other combination of ions

question

A formula unit of ammonium sulfate consists of ________ ammonium ions and ________ sulfate ions.

 

 

answer

A) one; two

B) two; one

C) two; three

D) three; two

E) four; four

question

The formula Ca(NO3)2 tells us that one formula unit of this compound is composed of ________ calcium atoms, ________ nitrogen atoms, and ________ oxygen atoms.

 

 

answer

A) one; two; six

B) two; two; six

C) one; two; five

D) one; one; five

E) one; one; six

question

The formula for the compound chromium(II) nitrate is ________.

 

 

answer

A) C2NO3

B) Cr2NO3

C) CrNO3

D) Cr(NO3)2

E) CrNO2

question

What is the name of Mg3(PO4)2?

 

 

answer

A) trimagnesium diphosphate

B) magnesium diphosphate

C) trimagnesium phosphate

D) magnesium phosphate

E) magnesium phosphorus oxide

question

What is the name of AlCl3?

 

 

answer

A) aluminum chloride

B) aluminum(III) chloride

C) aluminum carbide

D) aluminum trichloride

E) aluminum tricarbide

question

The formula for ammonium hydroxide is ________.

 

 

answer

A) OHNH4

B) NH4NO3

C) NH4O

D) NH4OH

E) Al(OH)3

question

Which of the following formulas represents a compound that is a base?

 

answer

A) CaSO4

B) NH4Cl

C) Mg(OH)2

D) H2

E) none of the above

question

One definition of an acid is a substance that provides which ion in water solution?

 

 

answer

A) Na+

B) H+

C) OH-

D) NH4+

E) none of the above

question

One definition of a base is a substance that provides which ion in water solution?

 

 

answer

A) Na+

B) H+

C) OH-

D) NH4+

E) none of the above

question

Significant figures

Rules:

answer

1. Zeros in the middle of of a number are like any other digits; they are  ALWAYS significant.

2. Zeros at the beginning of a number are NOT significant; they act only to locate a decimal point

3. Zeros at the end of a number and after the decimal point AREsignificant. It is assumed that these zeros would not be shown unless they are significant.

4. Zeros at the end of a number and before an implied decimal point may or may not be significant.

question
Atomic number
answer

Number of protons and electrons 

 

 

30

Z

 

question
Atomic mass
answer

30

Zn

65.4


Number of protons and neurons

65.4 - 30 = 35.4

Zn= 1s2 2s2 2p6 3s2 3p6 4s2 3d10

question
What is the ?t if a 300 cal is added to 50.0g water with the specific water heat?
answer

 1.0 cal /  g°  C

?t= Q/mC

 

C = Q / m ?t

(cal / g° C)

 

= 300 cal / (50.0g)(1.0cal / g°C)

= 6.00 °C

question
Formulas for heat
answer

Q = energy

m = mass

= specific heat

?t = change in temperature


Q=mC?t

question
Basic Unit Convertions
answer

Kilo (K) = 1000   103

base = 1

centi (c) = 1/100 =10-2

mili (m) = 1/1000 = 10-3

micro (µ) = 1/1 000 000 = 10-6

nano (n) = 1/1 000 000 000 =10-9

question
Formulas for density
answer

 

D = m/v

 

V = m/d

 

M = vd

 

question
Polyatomic Ions Charges
answer

CO3-2     Carbonate ; stays CO3-2 

SO4-2          Sulfate

PO4-3  Phosphate

OH -    Hydroxide

NH4    Ammonia   

NO3    Nitrate

 

 

question

Hypothetical!!

What is the average mass of Fluorine if it exists at 

  • 80% F 18.96
  • 10% F 19.02
  • 8%   F 19.53
  • 2%   F 18.10
answer

? (0.80 x 18.96) + (0.10 x 19.02) + (0.08 x 19.53) + (0.02 x 18.10) =

     18.9944

question
Know specific heat!
answer
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