Brown Invitational — Forensics

Forensics · Division C · Brown Invitational · 2023

62 questions · 82 points · 50 min· 15 questions from the original omitted

Original test source

Powders Direction :: Identify the powders according to the number on the bag (#1-6) then answer the multiple choice questions below (#7-17)

Question 5

2 pts

Powder 5 is insoluble in water, has a reaction to HCl, and pH of 8. What is Powder 5?

A. CaSO₄B. CaCO₃C. Ca(NO₃)₂D. MgSO₄

Question 7

2 pts

To test for pH, usually litmus paper is used. Litmus is extracted from which plant?

A. Litmus plantB. HydrangeaC. ColeusD. Lichen

Question 8

2 pts

Another method of testing pH is using phenolphthalein. If a solution turns pink in phenolphthalein, what kind of solution is it?

A. AcidicB. BasicC. NeutralD. None of the above

Question 9

2 pts

Which of the following powders is the least soluble in distilled water?

A. Calcium sulfateB. Calcium nitrateC. Magnesium sulfateD. Ammonium chloride

Question 10

2 pts

Which of the following powders has an endothermic heat of solution?

A. Calcium sulfateB. Lithium chlorideC. Magnesium sulfateD. Ammonium chloride

Question 11

2 pts

Complete the chemical reaction between sodium bicarbonate and hydrochloric acid: NaHCO₃(aq) + HCl(aq) →

A. NaHCl(aq) + HCO₃(aq)B. NaCCl(aq) + H₂O₃(aq)C. NaCl(aq) + H₂O(l) + CO₂(g)D. NaCl(aq) + H₂O(l) + C(s) + O₂(g)

Question 12

2 pts

Complete the chemical reaction between calcium nitrate and sodium hydroxide: Ca(NO₃)₂(aq) + 2NaOH(aq) →

A. Ca(OH)₂ (aq) + 2NaNO₃(aq)B. Ca(OH)₂ (aq) + 2NaNO₃(s)C. Ca(OH)₂ (s) + 2NaNO₃(aq)D. Ca(OH)₂ (s) + 2NaNO₃(s)

Question 13

2 pts

The iodine used in iodine testing isn't pure iodine; it is called Lugol's iodine. What is iodine mixed with in water to produce Lugol's iodine?

A. Sodium iodideB. Potassium iodideC. Calcium iodideD. None of the above

Question 14

2 pts

A solution turns green when it reacts with Benedict's solution. What does this solution likely contain?

A. 0.5% glucoseB. 1.5% glucoseC. 0.5% sucroseD. 1.5% sucrose

Question 15

2 pts

Which of the following powders has a red flame in a flame test?

A. Sodium chlorideB. Potassium chlorideC. Lithium chlorideD. Ammonium chloride

Question 16

2 pts

A flame test is done on a powder, and it results in a yellow flame. However, when cobalt blue glass is used, a violet flame can be seen. What powder is being tested?

A. Sodium chlorideB. Potassium chlorideC. Lithium chlorideD. Ammonium chloride

Question 17

2 pts

What color light does cobalt blue glass absorb?

A. Yellow lightB. Green lightC. Blue lightD. Violet light

Fibers Directions :: Identify the following fibers (#1-5) and answer the accompanying questions (#6-10)

Question 5

1 pt

What is Fiber 5?

A. SilkB. NylonC. CottonD. Polyester

Question 6

1 pt

Which of the following fibers can be dissolved in 6M hydrochloric acid?

A. CottonB. WoolC. SilkD. Nylon

Question 7

1 pt

Which of the following fibers can be dissolved in bleach?

A. CottonB. WoolC. SpandexD. Nylon

Question 8

1 pt

A burn test is done on a fiber. The fiber slowly melts, and a black sticky substance remains. Which fiber is this?

A. CottonB. WoolC. SpandexD. Nylon

Question 9

1 pt

What shape is silk's cross section under a microscope?

A. Triangle-shapedB. Pentagon-shapedC. Hexagon-shapedD. Circular-shaped

Hair Directions :: Identify the following hair (#1-5) and answer the accompanying questions (#6-12)

Question 6

1 pt

Which of the following stages of hair growth describes the active growing stage?

Question 7

1 pt

Which of the following stages of hair growth describes the transitional stage between actively growing and resting?

Question 8

1 pt

Which of the following stages of hair growth describes the resting stage?

Question 9

1 pt

Which of the following stages of hair growth describes the shedding stage?

Question 10

1 pt

Which of the following stages of hair growth describes the stage between an empty hair follicle and a new hair?

Question 11

1 pt

The hair consists of a cuticle, medulla, and cortex. If you were to name each component in order from the outer edge of a hair to its inner core, what would it be the order that each component is named?

A. Cuticle, medulla, cortexB. Cortex, medulla, cuticleC. Medulla, cortex, cuticleD. Cuticle, cortex, medulla

Question 12

1 pt

The biggest way to differentiate animal and human hair is the difference in their medullary index. Which of the following medullary indices is likely to be that of a human hair?

A. 1/4B. 1/2C. 2/3D. 1

Plastics Directions : Answer the following questions (#1-10) about plastics below

Question 1

1 pt

Which of the following would burn green?

A. Plastic wrapB. Shampoo containersC. MylarD. Soft drink bottles

Question 2

1 pt

A type of plastic that would be used to make a Walmart plastic bag is:

A. Polymethyl MethacrylateB. PolycarbonateC. Low-Density polyethyleneD. Polypropylene

Question 3

1 pt

What is the most common type of plastic in the world?

A. High-Density polyethyleneB. PolycarbonateC. PolyethyleneD. Polymethyl Methacrylate

Question 4

1 pt

You found a really sick pair of sunglasses on the ground. What type of plastic is it made of?

A. PolycarbonateB. Polyethylene TerephthalateC. Low-Density polyethyleneD. High-Density polyethylene

Question 5

1 pt

What happens when you react with polystyrene with acetone?

A. The acetone dissolves in polystyreneB. The polystyrene dissolves in the acetoneC. A strong burnt scent will be producedD. These substances will not be mixed when dissolved in each other

Question 6

1 pt

What is the density of Polyvinyl Chloride?

A. About 1.38 g/cm³B. About 1.39 g/cm³C. About 2.38 g/cm³D. About 2.39 g/cm³

Question 7

1 pt

Identify the following structure below:

A. HDPEB. LDPEC. MDPED. SDPE

Question 9

1 pt

Which type of structure is easier to recycle?

A. HDPEB. LDPEC. MDPED. SDPE

Question 10

1 pt

Why is the other structure harder to recycle?

A. It will turn into liquid when put into the recycle machineryB. It cannot be turned into usable plastic anymoreC. It is harder and can get caught in recycle machineryD. It is softer and can get caught in recycle machinery

MASS SPECTROMETRY

Question 1

5 pts

What is the base peak of the compound?

A. Around 45 m/zB. Around 44 m/zC. Around 61 m/zD. Around 28 m/z

Question 2

5 pts

What is the molecular formula for this compound?

A. GlucoseB. KClC. SucroseD. H3BO3 (Boric Acid)

Blood Direction: Answer the following questions (#1-15) below

Question 1

1 pt

Identify which group of animal Microscope Slide A belongs to:

A. MammalianB. ReptilianC. AvianD. None of the above

Question 2

1 pt

Identify which group of animal Microscope Slide B belongs to:

A. MammalianB. ReptilianC. AvianD. None of the above

Question 3

1 pt

Identify which group of animal Microscope Slide C belongs to:

A. HumanB. ReptilianC. AvianD. None of the above

Question 4

1 pt

Which microscope slide is closest to Arthur's blood sample?

A. Microscope AB. Microscope BC. Microscope CD. None of the above

Question 5

1 pt

What blood type is Buster?

A. AB +B. O-C. AB-D. A+

Question 6

1 pt

What blood type is Francine?

A. A-B. O-C. AB-D. B+

Question 7

1 pt

What blood type is Muffy?

A. O+B. B+C. AB-D. AB+

Question 8

1 pt

What blood type is Binky?

A. B-B. A+C. AB-D. O-

Question 9

1 pt

What blood type is DW?

A. A-B. O+C. A+D. AB-

Question 10

1 pt

What blood type is Mr. Ratburn?

A. B+B. O-C. AB+D. B-

Question 11

1 pt

If Francine is what is known as a universal donor, what blood type is he?

A. O+B. AB-C. AB+D. O-

Question 12

1 pt

Who has the rarest blood type?

A. BinkyB. MuffyC. FrancineD. Mr. Ratburn

PassageFor question 15

DIRECTIONS: Below are some conceptual questions about blood type:

Question 15

1 pt

What is a Rh factor?

A. Equation to determine the velocity of a blood splatterB. The refraction magnitude of a lensC. The distance a pigment travels in chromatographyD. Protein found on surface of blood cells that determines if the blood type is negative or positive

Fingerprint Direction: Answer the following questions (#16-24) about fingerprints, use the diagrams as needed

Question 16

1 pt

What type of fingerprint is fingerprint 1?

A. Accidental WhorlB. Radial LoopC. Plain ArchD. Ulnar Loop

Question 17

1 pt

What type of fingerprint is fingerprint 2?

A. Central Pocket LoopB. Double Loop WhorlC. Plain WhorlD. Tented arch

Question 18

1 pt

What type of fingerprint is fingerprint 3?

A. Double loop whorlB. Central Pocket LoopC. Accidental WhorlD. Plain Whorl

Question 19

1 pt

What type of fingerprint is fingerprint 4?

A. Double Loop WhorlB. Central Pocket LoopC. Plain archD. Tented arch

Question 20

1 pt

What type of fingerprint is fingerprint 5?

A. Plain archB. Tented archC. Accidental WhorlD. Radial Loop

Question 21

1 pt

What type of fingerprint is fingerprint 6?

A. Ulnar LoopB. Radial LoopC. Accidental LoopD. Double Loop

Question 22

1 pt

This fingerprint was collected from Arthur's shattered glasses. Who does it implicate?

A. DWB. BinkyC. FrancineD. Mr. Ratburn

Question 23

1 pt

What ridge characteristic is circled in the fingerprint in the previous question?

A. DotB. DeltaC. CoreD. Bridge

Question 24

1 pt

What type of fingerprint development methods would be used to examine latent fingerprints on a paper cup?

A. IodineB. NinhydrinC. CyanoacrylateD. Wetwop