1). Match each picture or equation with the correct type of reaction. Each type of reaction will be used 2 times.
Column A
Column b
2).Which phrase best describes a redox reaction?
a). a chemical reaction involving the transfer of electrons from one reactant to another
b). a chemical reaction resulting in a compound composed of ions held together by electrostatic forces
c). a chemical reaction involving the burning of a metal in the presence of oxygen
d). a chemical reaction resulting in the sharing of valence electrons
3).Which statement below correctly identifies a rule for assigning oxidation numbers?
please if someone is getting the same questions as me post the answers please. i really need this because is our last test before finals
1) To match each picture or equation with the correct type of reaction, you would need to have a clear understanding of the different types of reactions. Here are some common types of reactions and how to determine them:
- Combination reaction: This type of reaction occurs when two or more reactants combine to form a single product. It is represented by the general equation A + B → AB. Look for an equation where two or more substances form a single product.
- Decomposition reaction: This type of reaction occurs when a single compound breaks down into two or more simpler substances. It is represented by the general equation AB → A + B. Look for an equation where a single substance breaks down into multiple products.
- Single displacement reaction: This type of reaction occurs when an element reacts with a compound and displaces another element within the compound. It is represented by the general equation A + BC → AC + B. Look for an equation where an element is replacing another element in a compound.
- Double displacement reaction: This type of reaction occurs when two compounds react and exchange ions to form new compounds. It is represented by the general equation AB + CD → AD + CB. Look for an equation where two compounds swap ions to form new compounds.
- Combustion reaction: This type of reaction occurs when a substance reacts with oxygen, often producing heat and light. It is represented by the general equation CxHy + O2 → CO2 + H2O. Look for an equation involving the burning of a substance in the presence of oxygen.
By analyzing the given pictures or equations, you can identify the type of reaction by matching the characteristics of the equation with the descriptions of the different types of reactions.
2) The phrase that best describes a redox reaction is option (a) - a chemical reaction involving the transfer of electrons from one reactant to another. In a redox reaction, there is a transfer of electrons, where one reactant becomes oxidized (loses electrons) and another reactant becomes reduced (gains electrons). This transfer of electrons leads to a change in the oxidation states of the elements involved.
3) There are several rules for assigning oxidation numbers, but one common rule is as follows:
- Rule 1: The oxidation number of an element in its elemental state is zero. For example, the oxidation number of oxygen in O2 is zero.
- Rule 2: The oxidation number of a monatomic ion is equal to the charge of the ion. For example, the oxidation number of Na+ is +1.
- Rule 3: In a neutral compound, the sum of the oxidation numbers of all the elements is zero. For example, in H2O, the oxidation number of hydrogen is +1, and the oxidation number of oxygen is -2, which adds up to zero.
- Rule 4: In a polyatomic ion, the sum of the oxidation numbers of all the elements is equal to the charge of the ion. For example, in SO4^2-, the oxidation number of sulfur can be calculated by setting the sum of the oxidation numbers to -2.
These rules can help assign oxidation numbers to elements and determine the changes in oxidation states that occur during a chemical reaction.