Question

the empirical formula of ethene is ch₂. what is the molecular formula, and what do you know about the bonding between the carbon atoms?
c₂h₄ - triple
ch₂ is the empirical and molecular formula.
c₂h₄ - double
c₂h₄ - single
15 multiple answer 1 point
what happens when an ionic bond is formed? (choose all that apply.)
metals take electrons from nonmetals.
cations give electrons to anions.
anions give electrons to cations.
nonmetals take electrons from metals.
16 multiple choice 1 point
which statement about the carbon - 12 isotope is true?
carbon - 12 has 12 protons.
carbon - 12 has 12 electrons.
carbon - 12 has 12 neutrons.
carbon - 12 has 6 protons and 6 neutrons.

Explanation:

Question 1 (Ethene Molecular Formula and Bonding)

Ethene is an alkene with the molecular formula \( C_2H_4 \). The empirical formula \( CH_2 \) has a ratio, and the molecular formula is a multiple. Carbon atoms in ethene are double - bonded (\( C = C \)). Among the options, " \( C_2H_4 \) - double" is correct. The option with triple bond is wrong (alkynes have triple bonds), \( CH_2 \) can't be the molecular formula as ethene has 2 C atoms, and single - bonded would be an alkane (which has a different formula).

In ionic bond formation, metals (which are electropositive) lose electrons and non - metals (electronegative) gain electrons. So non - metals take electrons from metals, and metals (which form cations) lose electrons to non - metals (which form anions, as anions are negative and gain electrons). So the correct options are "Metals take electrons from nonmetals" (wrong, metals lose electrons) is incorrect; "Cations give electrons to anions" (cations are formed by losing electrons, so this is wrong); "Anions give electrons to cations" (anions gain electrons, so this is wrong); "Nonmetals take electrons from metals" (correct as non - metals are electronegative and gain electrons from electropositive metals). Also, the process can be thought of as metals (cations - forming) losing electrons which are taken by non - metals (anions - forming). So the correct options are "Metals take electrons from nonmetals" is incorrect, "Nonmetals take electrons from metals" is correct. Wait, actually, the correct statements are: Metals lose electrons (so non - metals take electrons from metals) and cations are formed from metals losing electrons, anions from non - metals gaining electrons. So the correct options are "Metals take electrons from nonmetals" (incorrect), "Nonmetals take electrons from metals" (correct). Also, the other way: when forming ionic bonds, metals (cations) lose electrons, non - metals (anions) gain electrons. So the correct options are "Nonmetals take electrons from metals" and "Metals take electrons from nonmetals" is wrong, "Cations give electrons to anions" is wrong (cations have already lost electrons), "Anions give electrons to cations" is wrong (anions have gained electrons). So the correct options are "Nonmetals take electrons from metals" and if there was an option "Metals lose electrons to nonmetals" but in the given options, "Nonmetals take electrons from metals" is correct.

Carbon has an atomic number of 6, so the number of protons in carbon - 12 is 6. The number of electrons in a neutral carbon - 12 atom is also 6 (since in a neutral atom, protons = electrons). The mass number of carbon - 12 is 12, and mass number = number of protons+number of neutrons. So number of neutrons = 12 - 6 = 6. So the statement "Carbon - 12 has 6 protons and 6 neutrons" is correct. "Carbon - 12 has 12 protons" (wrong, atomic number is 6), "Carbon - 12 has 12 electrons" (wrong, neutral atom has 6 electrons), "Carbon - 12 has 12 neutrons" (wrong, 12 - 6 = 6 neutrons).

Answer:

C. \( C_2H_4 \) - double (assuming the options are labeled as A, B, C, D with A: \( C_2H_4 \) - triple, B: \( CH_2 \) is the empirical and molecular formula, C: \( C_2H_4 \) - double, D: \( C_2H_4 \) - single)

Question 15 (Ionic Bond Formation)