Download Chemistry S1 Unit 5 – Chemistry At Work Check for Understanding

Chemistry S1 Unit 5 – Chemistry At Work
Check for Understanding
Name
Directions: Answer each question using the information and knowledge you currently have. After the teacher grades your quiz, take notes
to support the questions and answers. One note for your correct answers, two notes for your incorrect answers.
1.
What is an oxidation state?
A. The physical state the element is in before a reaction
B. The number of atoms of that element in a compound
C. The number of electrons transferred in the reaction
D. The charge an element would have if it were an ion
My Answer
2.
Correct Answer
Notes
What is the oxidation state of Cl in HClO3?
A. +5
B. -6
C. +6
D. -1
My Answer
Correct Answer
Notes
3. What does it mean for an element to be reduced?
A. The element has reacted with oxygen.
B. There are fewer atoms in the product than in the reactant.
C. The element is in ion form in solution.
D. The element has gained one or more electrons.
My Answer
Correct Answer
Notes
4. In the redox reaction AgNO3 + Na NaNO3 + Ag, which element has been reduced?
A. Sodium (Na)
B. Oxygen (O)
C. Nitrogen (N)
D. Silver (Ag)
My Answer
Correct Answer
Notes
5. What are half-reactions?
A. Equations showing only the ions involved in a net ionic equation
B. Equations showing what compounds are involved in a reaction
C. Equations showing the electronegativities of atoms in a reaction
D. Equations showing which elements are oxidized and which are reduced
My Answer
Correct Answer
6. What is the reduction half-reaction for 2Mg + O2 2MgO?
A. Mg2+ + 2e- Mg
B. 2O2? O2 + 4eC. O2 + 4e- 2O2D. Mg Mg2+ + 2eCorrect Answer
My Answer
7. Which element is the reducing agent in a redox reaction?
A. The reactant that has the atom that gets oxidized
B. The reactant that has the atom that gets reduced
C. The product that has the atom that was reduced
D. The product that has the atom that was oxidized
Correct Answer
My Answer
8.
A. Fe
B. Ag+
C. Fe3–
D. NO3
Notes
Notes
Notes
What species is reduced in the reaction Fe + AgNO3 Fe(NO3)3 + Ag?
My Answer
Correct Answer
Notes
9. What needs to be considered in balancing redox reactions?
A. Oxidation states and charge
B. Both atoms and charge
C. Both H+ and OH– ions
D. Voltage and oxidation states
My Answer
Correct Answer
Notes