Questions CHO3- hmw

Describe a nonpolar covalent bond, a polar covalent bond, and an ionic bond

• Nonpolar covalent bond: equal sharing of electrons between atoms

• Polar covalent bond: unequal sharing of electrons that creates partial charges

• Ionic Bond: complete transfer of electrons to another (ions) that attract each other

Characterize each of the following as covalent or ionic compounds:

• CH₄

• LiBr

• CaO

• CO₂

• CCl₄

• NaCl

• P₄O₁₀

• covalent

• ionic

• ionic

• covalent

• covalent

• ionic

• covalent

Explain the difference between covalent and ionic bonds

The difference is that covalent bond share electrons while ionic bonds transfer electrons

Discuss the similarities and differences between atoms and molecules?

Atoms and Molecules are both tiny particles that make up all matter and can both participate in chemical reactions. The difference is that atoms are single building block while molecules are two or more building blocks stuck together

Explain the difference between valency and valence electrons

Valency is the bonding capacity of the atom while valence electrons is the actual electrons in the outer shell

What elements can form double bonds?

• carbon

• nitrogen

• oxygen

• some transition metals

What elements do not form triple bonds?

• hydrogen

• boron

• carbon

• silicon

Discuss the similarities and differences between nonpolar covalent and polar covalent bonds?

They both share electrons and occur between nonmetals. Nonpolar covalent bonds share electrons equally and form when atoms have similar electronegativities. However, poor covalent bonds share unequal electrons and form when atoms have different electronegativities.

Discuss the similarities and differences between ionic and polar covalent bonds

Ionic and polar covalent bonds are similar because both involve attraction created by differences in electronegativity, but they differ in that ionic bonds form when one atom fully transfers an electron to another (like sodium giving an electron to chlorine in table salt), while polar covalent bonds form when atoms share electrons unequally, creating partial charges instead of full ones (like oxygen pulling harder on electrons than hydrogen does in water).

Which elements will never form ionic bonds?

• noble gases

• sodium & calcium

• sulfur & oxygen

Which elements will never form covalent bonds?

• Argon

• helium

• noble gases

What type of bond is formed between a metal and a nonmetal?

ionic bond

What type of bond is formed between a nonmetal and a nonmetal?

covalent bond

What type of compound (ionic or covalent) results from the bonding of four hydrogen atoms to a single carbon atom?

covalent compounds

Please explain to the jury chemical bonding and the bonding ability of atoms

Chemical bonding is the process that allows atoms which are tiny particles that make up all matter to join together by interacting through their outer electrons, creating forced that hold them together in stable structures. Atoms bond because, they become more stable when their outer electron shells are filled, so they will gain, lose, or share electrons to achieve that stability. This would lead to different types of bonds. An atom bonding ability, called its valency depends on how many electrons it needs to gain, lose, or share to fill its outer shell, and this simply explains how atoms connect to form substances

Describe the “mole concept” to members of the jury and provide examples

The mole concept is a way chemists count tiny particles like atoms and molecules by grouping them into a standard quantity, the same way we use the word “dozen” to mean twelve. One mole represents 6.02 × 10²³ particles, which is a number so large that it helps us measure atoms in practical amounts. For example, 1 mole of water contains 6.02 × 10²³ water molecules, and 1 mole of carbon atoms weighs exactly 12 grams. This concept allows scientists to connect what happens in chemical reaction at the atomic level to real-world amounts we can weigh and measure.

Calculate the molar masses of the following compounds:

• NaCl

• CO₂

• Li₂O

• H₃PO₄

• KOH

• HCl

• H₂C₂O₄

• Al₂O₃

• NaCl →58.44 g/mol

• CO₂ →44.011 g/mol

• Li₂O →29.88 g/mol

• H₃PO₄ →97.998 g/mol

• KOH →56.106 g/mol

• HCl →36.458 g/mol

• H₂C₂O₄ →90.038 g/mol

• Al₂O₃ →101.964 g/mol