Unit 3 Quiz

• Carbon monoxide

• Carbon dioxide

• Dicarbon monoxide

• Carbon trioxide

Answer explanation

The correct name for CO₂ is carbon dioxide, as it consists of one carbon atom and two oxygen atoms. The prefix 'di-' indicates two, distinguishing it from carbon monoxide (CO) and other options.

What is the correct formula for sulfur hexafluoride?

Answer explanation

The correct formula for sulfur hexafluoride is SF₆, indicating one sulfur atom and six fluorine atoms. The other options do not accurately represent the composition of sulfur hexafluoride.

• Sodium chloride

• Sodium chlorate

• Sodium chlorite

• Sodium perchlorate

Answer explanation

The ionic compound NaCl is commonly known as sodium chloride. It consists of sodium (Na) and chloride (Cl) ions, making 'Sodium chloride' the correct name. The other options refer to different compounds.

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Answer explanation

The correct Lewis dot structure for H2O shows two hydrogen atoms, each with one dot representing their single electron, and one oxygen atom with four dots, indicating its two lone pairs and two bonding electrons.

Tags

NGSS.HS-PS1-1

What shape and formula is this?

• CH4, Tetrahedral

• C3H, Tetrahedral

• CH, Bent

Answer explanation

The correct Lewis dot structure for CH₄ shows carbon with four dots representing its four valence electrons, and each hydrogen has no dots as they share one electron with carbon, forming four single bonds.

• Linear

• Trigonal pyramidal

• Tetrahedral

• Bent

Answer explanation

The VSEPR shape of NH3 (ammonia) is trigonal pyramidal due to the lone pair on nitrogen

• Polar

• Nonpolar

• Dinitrogen pentoxide

• Nitrogen pentoxide

• Dinitrogen oxide

• Nitrogen dioxide

Answer explanation

The compound N2O5 is named using the prefixes for the number of nitrogen and oxygen atoms. 'Di-' indicates two nitrogen atoms and 'penta-' indicates five oxygen atoms, resulting in the correct name: Dinitrogen pentoxide.

What is the correct formula for dinitrogen tetroxide?

Answer explanation

The correct formula for dinitrogen tetroxide is N2O4, which indicates two nitrogen atoms and four oxygen atoms. The other options do not accurately represent this compound.

• Calcium dichloride

• Calcium chloride

• Calcium chlorate

• Calcium chlorite

Answer explanation

The compound CaCl₂ consists of calcium (Ca) and chlorine (Cl) ions. The correct name is 'Calcium chloride', as 'dichloride' is not used for ionic compounds, and 'chlorate' and 'chlorite' refer to different compounds.