Little chemistry quiz

How many moles of Cl- ions are needed to completely combine with 0.25 moles of Mg+2 ions?

0.50

How many valence electrons does calcium have?

2

How many valence electrons does fluorine have?

7

Which element will have the lower ionization energy?

Ba

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the compound formed from the following: calcium and phosphate

Ca3(PO4)2

Predict the following chemical formula for a compound between calcium and chlorine.

CaCl2

Diatomic molecules of gases are due to ________ bonds.

Covalent

Which of the elements below has the greatest electronegativity?

F

Choose the correct name for the following compound: H2S

Hydrogen sulfide

Click on the box to choose which compound has a greater difference in electronegativities of its members. Use the chart of electronegativities in lesson 5 of this unit or your knowledge of general trends of electronegativities within families.

KCl

Predict the following chemical formula for a compound between lithium and oxygen.

Li2O

Based upon the valence electrons as taken from the periodic table, the formula for rubidium (Rb) chloride (Cl) is:

RbCl

Assuming the metals lose all their valence electrons, and the nonmetals gain electrons to complete the s-p subshells, which listing below shows the correct information for the element?

The listing for aluminum is correct.

A mole of Cu atoms has the same number of atoms as a mole of He atoms.

True

A molecule of dissimilar elements with a net charge remaining is called a polyatomic ion.

True

Electronegativity is defined as a measure of the tendency of atoms to attract electrons in a chemical bond.

True

In a chemical equation, the sum of the masses of the products is equal to the sum of the masses of the reactants.

True

In the following table, all the columns for the element oxygen are filled out correctly. Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Oxygen 1s22s22p4 1s22s22p6 -2

True

The bonding of two atoms will most likely occur if:

a more stable state can result from the union

Name the following compound: Cu2S

copper(I) sulfide

How could Cl change to gain stability?

gain one electron

Based upon the location of group IV on the periodic table, the ionic charge of the elements in it should be:

±4

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the compound formed from the following: ammonium and sulfite

(NH4)2SO3

An element of Group II loses two electrons in the process of a chemical combination. What is its ionic charge?

+2

If the element sulfur, S, was to lose two electrons per atom, the net ion charge of each atom would be:

+2

What is the oxidation number for Ba?

+2

When the amount of oxygen is limited, carbon and oxygen react to form carbon monoxide. How many grams of CO can be formed from 35.0 grams of oxygen?

61.3 grams of CO

Predict the following chemical formula for a compound between Al and S.

Al2S3

Predict the following chemical formula for a compound between aluminum and chlorine.

AlCl3

Neutral atoms of neon, atomic number of 10, have the same number of electrons as each of the following except:

Ar

Predict the formula for Ba+2 and S-2.

BaS

Using the periodic table, determine the ion charges of the following elements if valence electrons were removed or added to reach the octet.

Barium: +2 Iodine: -1 Potassium: +1 Aluminum: +3

Based upon location in the periodic table, the formula for beryllium (Be) chloride (Cl) is:

BeCl2

Ionization energy and electronegativity are related to the periodic table in that:

Both increase going across a row and up a column.

Which element, if combined with iodine, will have the greatest attraction for the iodine electrons?

C

Determine the best formula for reacting elements. calcium and iodine

Cal2

A _________ bond is a chemical bond between atoms with similar electronegativities; a sharing bond; valence electrons are shared.

Covalent

Choose the predominant type of bonding as ionic, covalent, or metallic for the substance below. H2O

Covalent

If D+2 would react with E-1, what do you predict to be the formula?

DE2

All atoms with the same number of electron shells (energy levels) have equal electronegativities.

False

All atoms with the same number of electron shells have an equal electronegativity.

False

Electronegativity increases as the size of the atom increases.

False

Electronegativity increases continuously as atomic number increases.

False

Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Nitrogen 1s22s22p6 1s22s22p3 -3

False

Helium is an example of a diatomic molecule.

False

In the following table, all the columns for the element beryllium are filled out correctly. Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Beryllium 1s12s2 1s1 +2

False

In the following table, all the columns for the element calcium are filled out correctly. Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1

False

In the following table, all the columns for the element oxygen are filled out correctly. (Beryllium is done as an example.) Element Electron Configuration of Atom Predicted Ion Charge beryllium 1s2, 2s2 +2 oxygen 1s2, 2s2, 2p4, 3s2 -2

False

Ionization energy is a measure of the ability of atoms to attract electrons within a bond.

False

The mass of 1 mole of Pb atoms is 6.023 x 1023.

False

Write the chemical formula for the following compound: Iron (III) flouride

FeF3

The most vigorous chemical reaction would likely come between:

Fr and F

hydrogen sulfide

H2S

Which element, if combined with sulfur, will have the greatest attraction for the sulfur electrons?

I

As the atomic numbers of the elements in column IIA increase, the size of the atoms generally:

Increase

As electronegativity difference increases, the degree of ionic character .

Increases

Generally, which of the three families of elements (metals, nonmetals, or inert gases) has the least tendency to form ionic bonds?

Inert Gases

Choose the predominant type of bonding as ionic, covalent, or metallic for the substance below. NaCl

Ionic

The type of chemical bond resulting from a complete electron transfer is:

Ionic

The reaction of a metal with a nonmetal would usually form a(n):

Ionic Bond

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the compound formed from the following: potassium and permanganate

KMnO4

The most active metals on the periodic table are found on the:

Lower left

Do metals or nonmetals have the greatest tendency to lose electrons and become positive ions?

Metals

Do the positive ions tend to be metals or nonmetals?

Metals

Which family (metals, nonmetals, or inert gases) generally has the valence electrons which are the easiest to remove from the atom?

Metals

Which one of the following elements will combine with chlorine in a 1:2 ratio to give a formula of XCl2?

Mg

Which element has the greatest electronegativity?

N

sodium sulfate

Na2SO4

Which compound would have a stronger ionic bond?

NaCl

Neutral atoms of argon, atomic number 18, have the same number of electrons as each of the following items except:

Ne

Would the two as yet undiscovered elements A+1 and D+2 react?

No

Do the negative ions tend to be metals or nonmetals?

Nonmetals

Which group, metals or nonmetals, has the greatest tendency to gain electrons and to become negative ions?

Nonmetals

Choose the correct name for the following compound: NaCl.

Sodium chloride

When atoms from Column I (Group 1) combine with atoms from Column VII (Group 17):

The bond will be ionic.

Why does electronegativity decrease from right to left within a period?

The total positive charge in the nucleus decreases.

N2 is an example of a diatomic molecule.

True

The attraction between various combinations of atoms will produce bonds which form molecules.

True

In the periodic table, the most active nonmetals will be found in the:

Upper right

Elements which have high electronegativities occur in Group:

VIIA

Give the location of the elements found in the periodic table which have the same valence electrons.

all members within any group

Give the location of the elements found in the periodic table which have the same number of shells.

all members within any period

Which graph represents the relationship between electronegativity (E.N.) and ionization energy (I.E.)?

https://goalac.owschools.com/media/o_chm_2015/5/pg23msa.gif

The energy needed to remove an electron from an atom is called __________ energy.

ionization

Select all that apply. A nonmetal:

is more likely than a metal to attract an electron requires more energy than a metal to lose an electron

How would Mg change to gain a noble gas structure?

lose 2 electrons

What would barium do to obtain a noble gas structure?

lose 2 electrons

How would B change to gain stability?

lose 3 electrons

A __________ bond is the bond formed between metal atoms.

metallic

Choose the predominant type of bonding as ionic, covalent, or metallic for the substance below. NiSn

metallic

From its position in the periodic table, one would predict that the element potassium has the following property:

more active than lithium

Negative ions are usually formed from:

nonmetals

What caused the bonding of two atoms which undergo an ionic bond?

opposite ions attract each other

What was the action between the 2 atoms in an ionically bonded compound that caused that ionic bond to form in the first place?

opposite ions attracted each other

The bond between F and Cl would be:

polar covalent

Which of the following could be the subshell representation of an element of Group IV?

s2p2

A covalent bond is formed by the following process:

sharing two electrons by two atoms

An ion is an atom with a net electrical charge due to ______.

the loss of one or more electrons the addition of one of more electrons Both of the above

The electrons which are primarily responsible for chemical bonds are:

the valence electrons

The electrons in the outer shell of an atom are called:

valence