Chemistry Quiz - chapter 5 (compounds and their bonds part 2)

False Correct answer: True

An atom of a given element forms a covalent bond in order to get a full outer shell of valence electrons, like the Noble gases.

False Correct answer: True

Covalent compounds made up of non-metals and non-metals; whereas an ionic compound must have a metal and a non-metal.

False Correct answer: True

Covalent compounds with two atoms of the same element such as O2 are called diatomic elements or molecular elements.

A polar covalent bond exists when atoms with different electronegativities share electrons in a covalent bond. Consider the hydrogen chloride (HCl) molecule. Each atom in HCl requires one more electron to form an inert gas electron configuration. Chlorine has a higher electronegativity than hydrogen, but the chlorine atom's attraction for electrons is not sufficient to remove an electron from hydrogen. Consequently, the bonding electrons in hydrogen chloride are shared unequally in a polar covalent bond.

Explain clearly why you chose the molecule HCl to be polar or non-polar in the previous answer. Use the electronegativity value of the atoms to explain your answer.

Polar molecule with 1 polar bond. Non-polar molecule with 1 polar bond. Non-polar molecule with 5 polar bonds. Correct answer: Polar molecule with 2 polar bonds.

How many polar bonds does the water, H2O, have? Is the molecule polar or non-polar?

46.068 11 8 Correct answer: 20

How many valence electrons does ethanol, C2H6O, have?

0 5 10 Correct answer: 8

How many valence electrons does neon have?

No answer text provided. Non-polar Correct answer: Polar

Is the molecule HCl non-polar or polar?

False Correct answer: True

Not all atoms have octet ,complete outer shell of valance electrons like noble gas. Beryllium , Be, and boron, B, atoms are exceptions to the octet rule. Beryllium requires only 4 electrons, and Boron requires only 6 electrons.

a nonpolar molecule with nonpolar bonds a polar molecule with polar bonds. a polar molecule with nonpolar bonds. Correct answer: a nonpolar molecule with polar bonds.

The carbon tetrafluoride molecule, CF4, is

nitrogen trioxide. dinitride trioxide. nitrogen oxide Correct answer: dinitrogen trioxide.

The correct name for the compound N2O3 is

dipole-dipole. ionic bonds dispersion forces Correct answer: hydrogen bonds.

The major attractive forces between molecules of ammonia ( NH3 ) are

linear. square. pyramidal. Correct answer: tetrahedral

The shape of the carbon tetrachloride molecule is

hydrogen bonding dispersion ion-ion Correct answer: dipole dipole

What is the major attractive force in SO2?

Carbon tetrahydroxide Carbon hydride Methane Correct answer: Carbon tetrahydride

What is the scientific name of CH4?

Tetrahedral Bent Trigonal pyramidal Correct answer: Trigonal planar

What is the shape of the central atom of the compound CH2O?

N F O C Correct answer: Li

Which of the following elements has the lowest electronegativity ?

Covalent compounds have higher boiling points than ionic compounds. Covalent compounds have a cation and an anion. Covalent compounds involve transferring one or more electrons. Correct answer: Covalent compounds involve electrons being shared.

Which of the following is correct about a covalent compound?

H2O HF CH4 Correct answer: F2

Which of the following molecules has a Lewis structure with the most lone pairs of electrons?

NaCl H2O NH3 Correct answer: N2

Which of the following substances contains a nonpolar covalent bond?