NaCl and KBr are ionic compounds. H2O and C6H12O6 are covalent compounds. How does Vanessa describe the difference between the melting points and elemental compositions of ionic and covalent compounds?

Ionic compounds have higher melting points than covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

Ionic compounds have higher melting points than covalent compounds. Ionic compounds are composed of all nonmetals while covalent compounds are composed of a metal and a nonmetal.

Ionic compounds have lower melting points than covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

Ionic compounds have melting points that are similar to covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

Which of the following is a property of an ionic compound?

conducts electricity when aqueous

If an ionic compound formed between an element from the first column of the periodic table and another from the sixth column, you would expect the compound to include

two atoms of the element from the first column and one atom of the element from the sixth column.

one atom from each of the two different elements.

one atom of the element in the first column and two atoms of the element from the sixth column.

three atoms of the element from the first column and two atoms of the element from the sixth column.

Why does the compound sodium fluoride contain an ionic bond?

The sodium transfers one electron to the fluorine to fulfill the octet rule.

The fluorine transfers one electron to the sodium to fulfill the octet rule.

The fluorine must share an electron with the sodium in order to fulfill the octet rule.

The sodium must share an electron with the fluorine in order to fulfill the octet rule.

Hector claims that a single sodium ion and a single oxygen ion do not bond together to form a stable binary ionic compound. Is he correct? Why or why not?

Hector is correct. The sum of the charges of the two ions must be zero in order for them to form a stable ionic compound.

Hector is incorrect. The two ions have opposite charges, so they will bond together in a binary ionic compound.

Hector is incorrect. The two ions have more than eighteen protons, so they will bond together in a binary ionic compound.

Hector is correct. The sum of the protons of the two ions must be divisible by eight in order for them to form a stable ionic compound.

One molecule of dinitrogen tetroxide contains

two nitrogen atoms and four oxygen atoms.

two nitrogen atoms and two oxygen atoms.

four nitrogen atoms and two oxygen atoms.

four nitrogen atoms and four oxygen atoms.

Which of the following statements is true with regard to bonds?

Ionic bonds require positive and negative charges, while covalent bonds require the sharing of electrons.

Ionic bonds and covalent bonds have exactly the same properties.

Ionic bonds require the sharing of electrons, while covalent bonds do not.

Ionic bonds and covalent bonds both require the transfer of protons and occur primarily between nonmetals.

New Unit 3 Review

Authored by Kyle Ashworth

Science

9th Grade

NGSS covered

Used 7+ times

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the formula for the compound formed when a potassium ion (K⁺) and a sulfide ion (S²⁻) unite?

K₂S

KS₃

KS₂

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which is the chemical formula for dinitrogen monoxide?

NO₂

N₂O

N₂O₃

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the correct name for MgF2?

magnesium difluoride

monomagnesium fluoride

magnesium fluoride

monomagnesium difluoride

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the name of the compound with the formula CaI2?

calcium iodine

calcium iodide

calcium iodate

calcium diiodide

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which type of compound is usually formed when a metal reacts with a nonmetal?

allotropic

ionic

molecular

organic

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which matches the elements in the compound to the correct chemical formula?

lithium and bromine - Li₂Br

potassium and oxygen - KO₂

magnesium and fluorine - MgF₂

calcium and phosphorus - CaP₂

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is the correct name for the compound SO3?

monosulfur dioxide

trisulfur monoxide

sulfur trioxide

trisulfur oxide

Tags

NGSS.MS-PS1-1

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New Unit 3 Review

What is the formula for the compound formed when a potassium ion (K⁺) and a sulfide ion (S²⁻) unite?

Which is the chemical formula for dinitrogen monoxide?

What is the correct name for MgF2?

What is the name of the compound with the formula CaI2?

Which type of compound is usually formed when a metal reacts with a nonmetal?

Which matches the elements in the compound to the correct chemical formula?

Which of the following is the correct name for the compound SO3?

Which of the following is the correct way to write the formula for the compound carbon tetrafluoride?

Which of the following is the correct way to write the formula for the compound diphosphorus pentoxide?

Calcium (Ca) is in the second column of the periodic table and is classified as an alkaline earth metal. Which of the following formulas shows the ratio of a compound formed from calcium and iodine (I)?

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