Question 1

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products?
C₆H₁₂O₆ → ____ C₂H₆O + ____ CO₂

Accepted Answer

The answer of What coefficients must be placed in the...

Question 2

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

Accepted Answer

Sulfur has 6 valence electrons and hydrogen has 1 valence electron. To form a compound, they share electrons to fill their outermost shells. Each hydrogen atom needs 1 electron to fill its shell, while sulfur needs 2. Therefore, we need 2 hydrogen atoms for every sulfur atom, giving us the molecular formula H2S.

Question 3

We can represent atoms by listing the number of protons, neutrons, and electrons-for example,
2p⁺; 2n⁰; 2e⁻ for helium. Which of the following represents the ¹⁸O isotope of oxygen?

Accepted Answer

The atomic number of oxygen is 8, meaning it has 8 protons. The isotope ¹⁸O has 10 neutrons (18 total mass - 8 protons), so the answer is 8p⁺, 10n⁰, 8e⁻, which is option B.

Quiz 2: The Chemical Context of Life

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → C₂H₆O + CO₂

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p⁺; 2n⁰; 2e⁻ for helium. Which of the following represents the ¹⁸O isotope of oxygen?

Quiz 2: The Chemical Context of Life

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → ____ C₂H₆O + ____ CO₂

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p⁺; 2n⁰; 2e⁻ for helium. Which of the following represents the ¹⁸O isotope of oxygen?

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → C₂H₆O + CO₂