Free Printable MIDTERM EXAM CE CHEM FOR ENGINEERS

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MIDTERM EXAM CE CHEM FOR ENGINEERS

Total questions: 50

Worksheet time: 2hrs 26mins

Name

Class

Date

What are the coefficients when the equation is balanced?

2 + 3 --> 2 + 3 + 4

1 + 3 --> 1 + 3 + 2

2 + 4 --> 2 + 3 + 2

1 + 1 --> 1 + 1 + 1

What are the coefficients when the equation is balanced?

1 + 1 + 1 --> 2 + 1 + 3

2 + 2 + 2 --> 4 + 2 + 3

1 + 2 + 1 --> 2 + 2 + 3

1 + 1 + 1 --> 1 + 1 + 1

What element is being reduced?

H
H

S
S

O
O

If in a reaction, copper is reduced; its number of electrons has:

Increased

Decreased

Remained Constant

Varies Randomly

If an atom loses electrons during a chemical reaction, the atom was:

Oxidized

Reduced

Neutralized

Precipitated

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

Reduced

Synthesized

Oxidized

None of the above

In the reaction Zn + H₂O --> ZnO₂ + H₂
which element, if any, is oxidized?

Zinc

Hydrogen

Oxygen

None

Another name for a "oxidation-reduction" reaction is

chemical reaction

neutralization reaction

redox reaction

nuclear reaction

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

Iron

Fluorine

Oxygen

10.

Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O₂

Oxidized

Reduced

11.

In which substance does sulfur have a negative oxidation number?

CaSO₄

SO₂

Na₂S

12.

Which of the following species is the strongest oxidizing agent under standard-state conditions?

Ag⁺(aq)

H₂(g)

H⁺(aq)

Cl₂(g)

Al³⁺(aq)

13.

Which statement is true for a spontaneous redox reaction carried out at standard-state conditions?

E°_red is always negative.

E°_cell is always positive.

E°_ox is always positive.

E°_red is always positive.

14.

Which is the incorrect statement about voltaic cells?

Oxidation occurs at the cathode (positive electrode)

Electricity is produced as the result of spontaneous exothermic chemical reactions

Reduction occurs at the cathode (positive electrode)

Voltaic cells are also called galvanic cells

15.

Explain the function of a salt bridge in a voltaic cell

provides an electrical connection between the two half-cells to complete the circuit

provides an pathway for electrons to flow to each of the half-cells

allows ions to flow into or out of the half-cells to balance out the charges in the half-cells

prevents the flow of the anions and cations from the salt used in the salt bridge to the two half-cells

16.

A voltaic cell made up from an iron half-cell and a copper half-cell is operated.

What is the correct overall equation for the reaction in this cell?

Fe2+(aq) + Cu(s)

-> Fe(s) + Cu2+(aq)

Fe(s) + Cu2+(aq)

-> Fe2+(s) + Cu(s)

Fe2+(aq) + Cu2+(aq)

-> Fe(s) + Cu(s)

17.

In the standard notation for a voltaic cell, the single vertical line "|" represents:

gas electrode

a phase boundary

a salt bridge

18.

In this voltaic cell notation:

Pt | H2(g) | H+(aq) || Fe3+(aq), Fe2+ (aq) | Pt

Why Fe3+(aq) and Fe2+ (aq) are separated by a comma instead of a single vertical line which represents phase boundary?

they are in different phase

the comma is a more representative notation

they are in the same phase

19.

In an electrolytic cell the electrode at which the electrons enter the solution is called the ______ ; the chemical change that occurs at this electrode is called _______.

anode, oxidation

anode, reduction

cathode, oxidation

cathode, reduction

20.

Pb + 2Ag⁺ → Pb⁺² + 2Ag

The chemical species being reduced is

Pb⁺²

Ag⁺

21.

What unit of measurement do we use to measure electrical potential?

Watts

Volts

Amps

Ohms

22.

What reaction occurs at the anode?

Ag⁺ + e^- →Ag

Ag → Ag⁺ + e^-

Ni²⁺ + 2e^- → Ni

Ni → Ni²⁺ + 2e^-

23.

What is E^o for the following reaction?

+0.85

+0.51

–1.53

–1.87

24.

What is cell potential?

0.67

0.93

1.47

1.73

25.

What is the equation and cell potential?

2Al³⁺ + 3Ni → 2Al + 3Ni²⁺ E^O = 1.89 V

2Al + 3Ni²⁺ → 2Al³⁺ + 3Ni E^O = 1.89 V

2Al³⁺ + 3Ni → 2Al + 3Ni²⁺ E^O = 1.43 V

2Al + 3Ni²⁺ → 2Al³⁺ + 3Ni E^O = 1.43 V

26.

-0.41V

-0.27 V

+0.27 V

+0.41 V

27.

The relevant standard electrode potentials for this cell are shown below.

Cr3+(aq) + 3e- ⇌ Cr(s) E= − 0.74 V

Ag+(aq) + e− ⇌ Ag(s) E = + 0.80 V

Calculate the emf of the cell shown in the diagram.

+1.54 V

-1.54 V

+ 0.06 V

- 0.06 V

28.

Calculate the cell potential of a galvanic cell that uses the two half equation below

Sn²⁺ + 2e^- --> Sn⁴⁺ E⁰ = -0.14 V

Mg²⁺ + 2e^- --> Mg E⁰ = -2.37 V

-2.23 V

-2.51 V

+ 2.23 V

29.

Using the following standard reduction potentials

Fe³⁺(aq) + e --> Fe²⁺(aq) + e E⁰ = +0.77V

Ni²⁺ + 2e --> Ni E⁰ = -0.26V

Ni + 2 Fe³⁺ --> Ni²⁺ + 2 Fe²⁺

Calculate the standard cell potential for the above galvanic cell

-1.8V

+1.8V

+0.51 V

30.

Which is the correct line notation for the cell?

Ag⁺ I Ag II Ni I Ni²⁺

Ag I Ag⁺ II Ni I Ni²⁺

Ni I Ni²⁺ II Ag⁺ IAg

Ni²⁺ I Ni II Ag⁺ I Ag

31.

What would be the theoretical cell potential of the electrochemical cell

Ni I Ni²⁺ II Ag⁺ I Ag

Ag⁺ + e^- $\rightarrow$ Ag E^o = + 0.80V

Ni²⁺+2e^- $\rightarrow$ Ni E^o= -0.25V

1.05V

-1.05V

0.55V

-0.55V

32.

How much energy is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C? [specific heat (c) = 0.129 J/(g•°C)]

6.45 J/(g•°C)

6.45 J

16.1 J/(g•°C)

d.16.1 J

33.

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

12.82 °C

24.12°C

351 °C

34.

The unit of specific heat capacity is...

$Jkg^{-1}$

$JK^{-1}$

$J\degree C^{-1}$

$Jkg^{-1}K^{-1}$

35.

When a substance changes from solid to liquid it is known as

Fusion

Freezing

Vaporization

Condensation

36.

Which of the following is NOT a characteristic of Evaporation?

Thermal energy is supplied by the surroundings

Temperature remains constant

No bubbles are formed in the liquid

Takes place only at the liquid surfaces.

37.

I have 10kg of ice at -10˚C and I want to convert it all to water. The specific heat of ice is 2.1kJ/kg and the latent heat of fusion is 335kJ/kg. How much heat will I need?

210kJ

3350kJ

210 + 3350 = 3560kJ

210 + 3350 + 2100 = 5660kJ

38.

How much heat energy is required to melt 5 kg of ice? Specific latent heat of ice = 336 J/g.

168 J

1.68 x 103 J

16.8 x 103 J

1.68 x 106 J

39.

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

12.82 °C

24.12°C

351 °C

40.

A piece of aluminum with a mass of 20.0 grams is heated from 30 ^oC to 95 ^oC. If the specific heat of aluminum is 0.904 J/g^oC, how much heat is gained by the aluminum?

1717.60 J

1175.20 J

963.68 J

542.4 J

41.

What is material science?

Focus is on how to translate or transform materials into useful devises or structures.

Involves designing or engineering the structure-property correlations of a material to produce a predetermined set of properties.

A branch of science that focuses on materials; interdisciplinary field composed of physics and chemistry.

Relationship between the synthesis and processing, structure and properties of materials.

42.

These are the components of material science tetrahedron EXCEPT ...

Performance

Properties

Processing

Structure

Characterization

43.

There are 5 classification of material science. Metal,.............,ceramics, composites, advanced material.

A. Biomaterial

B. Polymer

C. Smart material

D. Semiconductor

44.

These are the reasons why you need to study material science and engineering EXCEPT

able to select the best material for certain application

able to create a new material

able to predict the properties of new found material

able to select the most expensive material for certain application

45.

A good electrical and heat conductor, strong and ductile. This statement refers to :

metal

polymer

ceramic

glass

46.

These are the characteristics of polymeric materials EXCEPT

Lightweight

Low densities

Good thermal insulator

Good electrical conductor

47.

Copper, titanium and nickel are the ________________ materials.

polymer

metal

semiconductor

composites

48.

A group of crystalline inorganic materials characterized by good strength, especially in

compression, and high melting temperatures. Many ceramics have very good electrical and thermal

insulation behavior.

(a)

49.

A group of materials formed from mixtures of metals, ceramics, or polymers in such

a manner that unusual combinations of properties are obtained (e.g., fiberglass).

(a)

50.

A combination of at least two materials, one of which is a metal whose properties are different from its original form.

Metalloid

Ceramic

Alloy

Nanomaterial

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MIDTERM EXAM CE CHEM FOR ENGINEERS

Total questions: 50

Worksheet time: 2hrs 26mins

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