Quiz 1 - Chemical Reactions | Fundamentals of Chemical Reactions

General Chemistry 2 - Quiz 1 - Chemical Reactions


What is the empirical formula of CH3CH2CH2O2CH2CH2CH3?

Empirical formula = the simplest whole-number ratio of atoms in a compound


What kind of reactions is: 2 Ag (s) + H2S (aq) → Ag2S (s) + H2 (g)?

A single replacement reaction is a chemical reaction in which one element is replaced by another in a compound.


Which of the following best describes a chemical reaction?

A chemical reaction involves breaking bonds in reactants and forming new bonds in products, leading to substances with new chemical identities.


According to the law of conservation of mass, which of the following statements is true?

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.


Balance the following chemical equation: C3H8 + O→ CO2 + H2O What is the coefficient of O2​ after balancing?

The balanced equation is C3H8 + 5 O→ 3 CO2 + 4 H2O, so the coefficient of O2​ is 5.


Which of the following is a combination reaction?

A combination reaction involves two or more simple substances combining to form a more complex product, as in the formation of HCl from H2 and Cl2.


What is the molecular formula of a compound with an empirical formula of CH2O and a molar mass of 180 g/mol?

The empirical formula mass of CH2O is 30 g/mol. Dividing the molar mass by the empirical formula mass gives 180/30 = 6, so the molecular formula is C6H12O6.


Which of the following is a double displacement reaction?

A double displacement reaction involves the exchange of ions between two compounds, resulting in the formation of two new compounds.


Which of the following is NOT a type of chemical reaction?

Diffusion is a process of mixing substances due to the random motion of particles and is not a type of chemical reaction.


The molecular formula of a compound is C6H12O6​. What is its empirical formula?

The empirical formula is the simplest whole-number ratio of atoms in a compound, which for C6H12O6 is CH2O.