Quiz Standard 1 Answer Key



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Explanation:
The compound formed has ionic bonds and is a crystalline solid. A metal plus a nonmetal chemical combine to form an ionic compound, with ionic bonds. Nearly all ionic compounds are crystalline solids at room temperature.

18) Which is a sub-atomic particle?

A)

compound




B)

electron




C)

isotope




D)

neuron




E)

None of the above


Explanation:
Electrons are an example of a sub-atomic particle, which is found outside of the nucleus of an atom. Isotopes are forms of elements with different numbers of neutrons, neurons are brain cells, and a compound is two or more elements chemically combined.

19)

http://www.usatestprep.com/modules/gallery/files/19/1984/1984.jpg

What is the result of the process that occurs in the image?



A)

two stable ions formed and able to exist independently




B)

one unstable compound that will only exist for a short period




C)

two ions formed and attracted to one another to form a stable compound




D)

two unstable ions which will immediately look for a substance with which to react




E)

None of the above


Explanation:_Lithium_fluoride_is_created_when_these_two_ions_are_formed_and_attracted_to_one_another_to_form_a_stable_compound'>Explanation:
Lithium fluoride is created when these two ions are formed and attracted to one another to form a stable compound, LiF. By moving one electron from lithium, its outer shell is now full (with two). Additionally, by adding this electron to fluorine, it gains a full, stable octet.

20) Which statement correctly explains how magnesium and chlorine combine to form magnesium chloride?

A)

A Cl atom donates two electrons to a Mg atom




B)

An Mg atom donates two electrons to a Cl atom.




C)

A Cl atom donates one electron to each of the two Mg atoms.




D)

An Mg atom donates one electron to each of the two Cl atoms.




E)

None of the above


Explanation:_Graduated_cylinders_measure_volume'>Explanation:
Cl has 7 electrons in its outermost orbit. It needs one electron to attain stability. So, a Mg atom donates one electron to each of the two Cl atoms to form MgCl2.

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Quiz Standard 2 Answer Key

Teacher Name:

Quiz Generated On: 04-28-2016

1) Lenny accidentally drops his matchbox car into a graduated cylinder. If the car has a mass of 10 grams and the water level in the cylinder rises from 41 ml to 46 ml. Determine the density of the matchbox car. The formula for density is D =

m

v

.

A)

0.5 g/ml




B)

2 g/ml




C)

15 g/ml




D)

50 g/ml




E)

None of the above


Explanation:_MgF_2'>Explanation:
The matchbox car has a density of 2 g/ml. Density = mass/volume = 10g/5mL=2 g/mL.

2) To find the density of an object you would use a graduated cylinder to find what characteristic of the object?

A)

length




B)

mass




C)

volume




D)

weight




E)

None of the above


Explanation:
Graduated cylinders measure volume. The height of a column of water indicates how many milliliters an object occupies.

3) A balanced chemical reaction obeys the law of

A)

ideal gases.




B)

definite proportions.




C)

conservation of matter.




D)

conservation of energy.




E)

None of the above


Explanation:_Nitrogen_monoxide'>Explanation:
It obeys the law of conservation of matter because you are putting the same amount of matter on each side of the equation.

4) Which is a unit of density?

A)

cm3/g




B)

g/cm




C)

g/cm3




D)

ml/g




E)

None of the above


_2AlCl_3__+_3Cu.'>Explanation:_The_correctly_balanced_decomposition_reaction_is_2KClO_3__--->_2KCl_+_3O_2_.'>Explanation:
g/cm3 is a measure of density. It represents mass over volume, which is density.

5) What is the chemical formula for the binary compound nitrogen dioxide?

A)

(NO)2




B)

1N2Ox




C)

NO2




D)

nitro1oxide2




E)

None of the above


Explanation:
The lack of a prefix on nitrogen tells you that there must be one nitrogen and the prefix di on oxide tells you that there must be two oxygen atoms. The number of atoms is denoted by its subscript. Therefore, the formula must be NO2.

6) When magnesium (Mg2+) and fluorine (F1-) combine in an ionic bond, the resulting formula will be

A)

Mg2F.




B)

Mg2F2.




C)

MgF.




D)

MgF2.




E)

None of the above


Explanation:
MgF2 is the correct formula because magnesium has an oxidation number of 2+ and fluorine has and oxidation number of 1-. The oxidation number tells you how many valence electrons the element is going to gain, loose, or share.

7) Lithium is a metal with an oxidation number of 1+ and oxygen is a nonmetal with an oxidation number of 2-. Which chemical formula represents the compound formed by these two elements?

A)

Li2O




B)

Li3O




C)

LiO




D)

LiO2




E)

None of the above


Explanation:
Li2O is the correct answer because lithium has one valence electron and oxygen has six. Therefore, oxygen bonds with 2 lithium atoms to complete the outer shell of 8.

8) Which compound is an example of a binary ionic compound?

A)

H2O




B)

H2SO4




C)

MgF2




D)

SF6




E)

None of the above


Explanation:
MgF2 is the only binary ionic compound because binary means two and an ionic compound is formed between a metal and a nonmetal.

9)

NO

Name this compound according to IUPAC nomenclature rules.

A)

nitrogen oxide




B)

nitrogen oxygen




C)

nitrogen monoxide




D)

mononitrogen monoxide




E)

None of the above


Explanation:
Nitrogen monoxide is the correct answer. The first element doesn't need a prefix for one; but the second element does.

10) Which nonmetal would an ion of Ca2+ MOST LIKELY ionically bond with in a 1:1 ratio?

A)

one atom of neon




B)

one atom of carbon




C)

one atom of oxygen




D)

one atom of fluorine




E)

None of the above


Explanation:
The correct choice is one atom of oxygen. Ionic bonds form between oppositely charged ions, therefore, calcium has a 2+ charge and is attracted to oxygen with 2- charge. The others have too much or too little of a charge.

11)

KClO3 ---> KCl + O2

Balance the decomposition chemical reaction.

A)

KClO3 ---> KCl + O2




B)

2KClO3 ---> KCl + 3O2




C)

2KClO3 ---> 2KCl + 3O2




D)

2KClO3 ---> 2KCl + 6O2




E)

None of the above


Explanation:
The correctly balanced decomposition reaction is 2KClO3 ---> 2KCl + 3O2. The others are not balanced because the number of atoms do not balance on both sides of the equation.

12)

CuCl2 + Al ---> AlCl3 + Cu

Balance the single replacement chemical reaction.

A)

CuCl2 + Al ---> AlCl3 + Cu




B)

3CuCl2 + 2Al ---> 2AlCl3 + 3Cu




C)

2CuCl2 + 3Al ---> 3AlCl3 + 2Cu




D)

3CuCl2 + 3Al ---> 3AlCl3 + 3Cu




E)

None of the above


Explanation:
The correctly balanced single replacement reaction is 3CuCl2 + 2Al ---> 2AlCl3 + 3Cu. The others are not balanced, the number of atoms on both sides of the equation do not balance.

13)

Pb(NO3)2 + K2CrO4 ---> PbCrO4 + 2KNO3

Classify the chemical reaction.

A)

synthesis reaction




B)

decomposition reaction




C)

single replacement reaction




D)

double replacement reaction




E)

None of the above



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