CM011L - Module 1

From CM011L Module Exam 1

Someone caught their sleeve on fire. What should you use?

• phone

• fire extinguisher

• eyewash

• fire blanket

fire blanket

A student has accidentally splash acid in their face, what must be use?

• eyewash

• phone

• safety shower

• SDS

eyewash

Why following instructions is important in the lab?

• Your lab partner might get lost.

• It could be on the test

• The teacher might ask you a question.

• It creates a safe and productive environment.

It creates a safe and productive environment.

The items which are appropriate lab wear are:

• safety glasses and lab coat

• lab coat and pocket protector

• sandals and shorts

• safety glasses and sandals

safety glasses and lab coat

Fanning strong vapors towards you is a good technique because:

• fumes can damage the tissues of your nose and lungs

• it is easier to identify the chemical

• this method protects the label on the bottle

• there will be less waste of the liquid

fumes can damage the tissues of your nose and lungs

At the conclusion of a lab session, students should:

• wash their hands

• clean their work stations

• clean and dry their lab equipment

• all of the above

all of the above

Round the number 3.46 to 2 significant figures.

• 3.3

• 3.0

• 3.4

• 3.5

3.5

Use the approximate rules to report the result of the following computation.

(43.221-1.6)/11.2

• 3.71

• 3.72

• 4

• 3.7

3.7

How many significant figures should the answer have if we divide: 100 / 0.001 ?

4

3

2

1

1

The ± relative error in the density of a metal rod is determined to be ± 0.02. If the calculated value of the density is 8.6321947..., how should the density be reported?

• 9

• 8.632

• 8.63

• 8.6

8.6

The combustion of octane is an exothermic reaction. Which statement is true for an exothermic reaction?

• It releases heat because the reactants have a higher energy than the products

• It consumes heat because the reactants have higher energy than the products

• It releases heat because the reactants have a lower energy than the products.

• It consumes heat because the reactants have a lower energy than the products.

It releases heat because the reactants have a higher energy than the products.

Where does the process of burning of fuel belongs?

• Endothermic and decreases entropy

• Exothermic and increases entropy

• Exothermic and decreases entropy

• Endothermic and increases entropy

Exothermic and increases entropy

When 2.50 g of potassium bromide dissolves in 1.00 × 102 g of water in a calorimeter, the temperature drops from 22.657°C to 21.661°C. What is the heat change per gram of potassium bromide dissolved in water? Assume that all the heat comes from the water (c = 4.18 J/g·°C)

• 26.0 J

• 0.0671 J

• 2.08 J

• 167 J

167 J

What volume of 0.15 M NaOH solution is required to completely neutralize 45 mL of 0.29 M CH3COOH.

• 91 mL

• 85 mL

• 89 mL

• 87 mL

• none of the above

87 mL

Calculate the molarity of the resulting solution prepared by diluting 25.0 mL of 18.0% ammonium chloride, NH4Cl, (density = 1.05 g/mL) to a final volume of 80.0 mL.

• 0.292 M

• 0.059 M

• 1.10 M

• 0.0536 M

• 0.00105 M

1.10 M

A 140.0-g sample of water at 25.0°C is mixed with 120.9 g of a certain metal at 100.0°C. After thermal equilibrium is established, the (final) temperature of the mixture is 29.6°C. What is the specific heat capacity of the metal, assuming it is constant over the temperature range concerned?

• 0.24 J/g°C

• 0.63 J/g°C

• 0.32 J/g°C

• 3.2 J/g°C

0.32 J/g°C

Generally, have a sour taste and produce a pH below 7 when dissolved in water

• phenolphaalein

• CH3COOH

• Vinegar

• NaOH

• HCl

CH3COOH

An aqueous solution of acetic acid and trace chemicals that may include in flavorings

• phenolphthalein

• NaOH

• Vinegar

Vinegar

Titrant used in acid-base analysis of vinegar

• NaOH

• phenolphthalein

• HCl

• Vinegar

• CH3COOH

NaOH

Acetic acid dissociated most completely in

• Vinegar

• phenolphthalein

• H2O

• NaOH

• HCl

HCl

Which statement is true about the reaction 2A→ B + C which is first order in A and first order overall?

• The rate of formation of C is twice the rate of reaction of A.

• The time required for one half of A to react is directly proportional to the quantity of A.

• The rate of formation of B is the same as the rate of reaction of A.

• The concentration of A will decrease exponentially.

• The rate of the reaction will decrease at higher concentrations of B and C.

The concentration of A will decrease exponentially.

The effect of a catalyst on a chemical reaction is to

• enable an alternate path for the reaction that has a lower activation barrier.

• increase the energy of the products.

• increase the frequency of collisions between reactants and products.

• increase the activation barrier for the forward reaction.

enable an alternate path for the reaction that has a lower activation barrier.

Which of the following statements best describes the condition(s) needed for a successful formation of a product according to the collision model?

• The relative orientation of the particles has an effect only if the kinetic energy of the particles is below some minimum value.

• The relative orientation of the particles must allow for formation of the new bonds in the product.

• The collision must involve a sufficient amount of energy, provided from the motion of the particles, to overcome the activation energy.

• The energy of the incoming particles must be above a certain minimum value, and the relative orientation of the particles must allow for formation of new bonds in the product.

• The relative orientation of the particles has little or no effect on the formation of the product.

The energy of the incoming particles must be above a certain minimum value, and the relative orientation of the particles must allow for formation of new bonds in the product.

A catalyst is effective because

• it lowers the activation energy for the reaction

• it increases the number of molecules with energy equal to or greater than the activation energy

• it increases the number of collisions between molecules

• it increases the temperature of the molecules in the reaction

it lowers the activation energy for the reaction

Which one of the following changes would alter the rate constant (k) for the reaction 2A + B ® products?

• increasing the concentration of B

• increasing the concentration of A

• increasing the temperature

• measuring k again after the reaction has run for a while

increasing the temperature

A 0.542 g sample of an unknown monoprotic weak acid requires 28.67 mL of 0.1093 M NaOH for neutralization. What is the molar mass of the acid?

• 173 g/mol

• 109 g/mol

• 88.0 g/mol

• 352 g/mol

• 218 g/mol

173 g/mol

What volume of 0.15 M NaOH solution is required to completely neutralize 45 mL of 0.29 M CH3COOH.

• 87 mL

• 85 mL

• 89 mL

• none of the above

• 91 mL

87 mL

What lab equipment is used for the heating of stable solid compounds and elements? Also used to seperate a solid suspended in a liquid by boiling away he liquid.

• watch glass

• volumetric flask

• wash bottle

• evaporating dish

evaporating dish

What lab equipment is used for holding and organizing test tubes on the laboratory counter? Also a good place to store test tubes while they dry.

• clamp holder

• extension clamp

• buret clamp

• test tube rack

test tube rack

Solute used in acid-base analysis

• NaOH

• Vinegar

• phenolphthalein

• HCl

• CH3COOH

HCl

Titrant used in acid-base analysis of vinegar

• HCl

• phenolphthalein

• Vinegar

• CH3COOH

• NaOH

NaOH

Which is NOT a property of a volatile liquid

• None of the above

• Low boiling point

• All of the above

• Low molar mass

• High boiling point

High boiling point

How would you write 3800000 to only 4 significant figures?

• 3.8 x 10⁶

• 3.8000 x 10⁶

• 3.800 x 10⁶

• 3.80 x 10⁴

3.800 x 10⁶

The answer to the following addition problem should be expressed as:

10.11111 + 1.02 + 100.00001 + 0.04000 = 111.17112

• 111.17112

• 111.17

• 111.2

• 111.1711

111.17

What is the sum of the following two numbers reported to the correct number of significant figures?

12.426 ± 0.002 + 1.3 ± 0.1

• 13.7

• 14

• 13.73

• 13.726

13.7

The unit of enthalpy is J. What is J a measure of?

• Sugar Content

• Fat content

• Temperature

• Energy

Energy

Where does the process of burning of fuel belongs?

• Exothermic and increases entropy

• Exothermic and decreases entropy

• Endothermic and increases entropy

• Endothermic and decreases entropy

Exothermic and increases entropy

A fire extinguisher, first aid kit and eye wash are all examples of___________.

• Safety Equipment

• Lab Safety

• Lab Equipment

• PPE

Safety Equipment

PPE inlcudes ___________,____________, and______________.

• Lab Coat, Gloves and Scrubs

• Rubber gloves, Face mask and Lab Coat

• Safety glasses, Face Mask and Lab Coat

• Safety goggles, Lab Coat and Nitrile gloves

Safety goggles, Lab Coat and Nitrile gloves

What does PPE stamds for?

• Practical Protective Equipment

• Personal Protective Equipment

• Protective Peronnel Equipment

• Protected Practical Equipment

Personal Protective Equipment

Which of the following may affect the value of the rate constant for a chemical reaction?

1. the presence of a catalyst

2. the concentrations of the reactants

3. the temperature of the reactants

• 3 only

• 1, 2, and 3

• 1 only

• 2 only

1, 2, and 3

Which one of the following changes would alter the rate constant (k) for the reaction 2A + B ® products?

• measuring k again after the reaction has run for a while

• increasing the temperature

• increasing the concentration of A

• increasing the concentration of B

increasing the temperature