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Reviewer > Gen Chem (Pre Test) Quiz Lesson 1-3 > Flashcards

Gen Chem (Pre Test) Quiz Lesson 1-3 Flashcards

1
Q

Which of the following statements would display a wise consumer?
* Making a comparison features of different brands of the products.
* Planning purchases in advance, comparing products and doing research.
* Identifying the brand names of the product you are buying.
* Buying all on sale products offered online as quality products.

A

Planning purchases in advance, comparing products and doing research.

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2
Q

Fire problems are being rampant in the environment in NCR because of the large number and setting of houses. What is the most evident physical property of matter that contributed to this problem?
* Corrosiveness of light materials
* Flammability and combustibility of materials
* Mass and corrosiveness of materials
* Density and flammability of light materials

A

Flammability and combustibility of materials

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3
Q

Which of the following is a chemical property of water?
* Water boils at 100°C.
* Ice floats on water
* Water reacts violently with sodium.
* Water expands when it freezes.

A

Water reacts violently with sodium

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4
Q

What possible separation technique is used if the miscible liquids have a significant difference in boiling points generally 70°C?
* Chromatography
* Evaporation
* Fractional Distillation
* Simple Distillation

A

Simple Distillation

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5
Q

A glowing match was dropped into a dry gas jar containing one gas only. The match (but not the gas) caught a light. Which gas is most likely present in the jar?
* carbon monoxide
* carbon dioxide
* hydrogen
* oxygen

A

Oxygen

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6
Q

All of the following are applications of chemistry in the area of food production EXCEPT one. Which is the exception?
* fixation of nitrogen by corn plants
* soil nutrient conservation
* study of income derived from rice production
* application of organic fertilizer

A

study of income derived from rice production

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7
Q

What is the reason for recycling or reusing plastics?
* can catch fire easily
* absorb odor
* expensive
* do not decompose easily

A

do not decompose easily

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8
Q

Naphthalene balls decrease in size when placed inside our clothes closet. When the clothes closet was opened the smell of naphthalene was very strong. What phase change do the mothballs undergo?
* evaporation
* condensation
* sublimation
* melting

A

sublimation

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9
Q

Which of the following elements is a metal that easily melts and burns with a yellow flame?
* sulfur
* sodium
* carbon
* gold

A

Sodium

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10
Q

Which of the following sets of properties are all extensive properties of a substance?
* mass, density, thickness
* density, boiling point, solubility
* mass, volume, height
* color, odor, taste

A

mass, volume, height

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11
Q

Which among the consumer products links water and dirt?
* Sodium Hydroxide in shampoo
* Alcohol - based hand sanitizer
* Hand sanitizer, and soap
* Soap or detergent

A

Soap or detergent

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12
Q

When water and kerosene were mixed, the kerosene floats on the water. What physical property of the material is behind this?
* Melting Point
* Polarity
* Flammability
* Conductivity

A

Flammability
(Supposedly, the answer is Density since it is the physical property that describes as such. Also, flammability is a chemical property.)

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13
Q

Which group contains an element, a mixture and a compound?
* salt, iron, water
* sulfur, air, chlorine
* seawater, lead, ammonia
* copper, calcium, carbon

A

seawater, lead, ammonia

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14
Q

Why is an iron classified as an element? Because it ___________
* reacts with oxygen.
* is formed when iron ore is heated at high temperatures.
* has never been decomposed.
* has been known for many centuries.

A

has never been decomposed

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15
Q

Why is freon continuously used as coolant despite protests from environmentalists?
* There wouldn’t be hair sprays or fire extinguishers without it.
* It is unreactive, non-toxic and non-flammable.
* It is safe to use.
* It is cheap.

A

It is unreactive, non-toxic and non-flammable.

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16
Q

What type of property of matter is Galvanized Iron sheet?
* Physical property – Reactivity
* Chemical property – Reactivity and Flammability
* Chemical property – Reactivity
* Chemical property – Flammability

A

Chemical property – Reactivity and Flammability

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17
Q

Which type of mixture is used in separating its components by decantation?
* Heterogeneous mixture
* Mixtures of organic compounds
* Any Mixtures
* Homogeneous mixture

A

Heterogeneous mixture

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18
Q

Kerosene and water are the components of the mixture that can be separated using decantation. What is the basis of separating the components of mixtures using this technique?
* Boiling points
* Solubility
*Solubility and Boiling points
* Density

A

Density

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19
Q

With the current situation, which best option below will help you ensure safety in choosing and buying chemical products that are sold online?
* Search for Material Safety Data Sheet of the product.
* Number of consumer who bought the product.
* Brand of the chemical product.
* Consumer rating on product.

A

Search for Material Safety Data Sheet of the product.

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20
Q

Forensic scientist uses ink to solve crimes by matching documents or stains found in a crime scene to the marker or pen that belongs to a suspect. What separation technique could be used?
* Chromatography
* Distillation
* Decantation
* Filtration

A

Chromatography

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21
Q

What makes a hand sanitizer a fire hazard?
* Due to water and glycerine contents.
* Due to water content.
* Due to its alcohol content.
* Due to its non-reactive component glycerine.

A

Due to its alcohol content.

22
Q

A loud popping sound was heard when a lighted stick was placed near the mouth of a test tube containing a gas sample. What gas is present inside the test tube?
* helium gas
* nitrogen gas
* oxygen gas
* hydrogen gas

A

hydrogen gas

23
Q

Which property makes it possible for a metal to be made into sheets?
* Brittleness
* Conductivity
* Metallic Luster
* Malleability

A

Malleability

24
Q

Which separation technique is used in a mixture of immiscible liquids?
* Decantation
* Distillation
* Filtration
* Evaporation

A

Decantation

25
Q

In an experiment, spoons made of different materials were used. A small amount of butter is placed at each end while the opposite ends of the spoons were submerged in hot water. The butter melt in only one of the spoons. Which of the following physical property of that spoon caused the melting of butter?
* Density
* Thermal Conductivity
* Diffusibility
* Characteristic Color

A

Thermal Conductivity

26
Q

Oil spill is evident in bodies of water. This is due to oil companies that discharge their wastes into the bodies of water. Which among these properties does NOT contribute to this phenomenon?
* Toxicity
* Polarity
* Flammability
* Density

A

Polarity

27
Q

What laboratory apparatus can be used in executing the decantation technique of separating the components of mixtures?
* Distilling flask
* Burette
* Condenser
* Separatory funnel

A

Separatory Funnel

28
Q

Which of the following would require knowledge of chemistry?
* diagnosis of illness
* brain scanning
* urinalysis
* autopsy

A

urinalysis

29
Q

How do you correctly bring down the mercury level of a laboratory thermometer to zero degree Celsius?
* Shake the thermometer
* Put the bulb in ice water
* Invert the thermometer
* Pour cold water over it

A

Put the bulb in ice water

30
Q

Which of the following consumer products has citric acid, copper and zinc as its active component?
* Toothpaste
* Surgical facemask
* Surgical gloves
* Detergent

A

Surgical Facemask

31
Q

Bloodstains are important in investigating a crime. Chemists used this as a specimen to allow the components to be separated. What separation technique then is utilized?
* Distillation
* Chromatography
* Filtration
* Evaporation

A

Chromatography

32
Q

Which physical test can be used to distinguish between a solution and a colloid?
* Tyndall effect test
* Litmus paper test
* Melting point test
* Boiling point

A

Tyndall effect test

33
Q

What property of a liquid enables you to decide about its purity?
* It is soluble in water.
* It has a constant boiling temperature.
* It is tasteless and odorless.
* It can be changed from one form to another.

A

It has a constant boiling temperature.

34
Q

Water refilling station delivers purified water in houses, which among the separation techniques is used in ensuring the quality and safety of water?
* Decantation
* Distillation
* Chromatography
* Distillation and Filtration

A

Distillation and Filtration

35
Q

Which of the following method can be used to separate a homogeneous mixture whose components boil at different temperatures?
* crystallization
* chromatography
* distillation
* filtration

A

distillation

36
Q

How will you know if the soap you are choosing is good or not good for bathing?
* Check the moisturizing content.
* Check the concentration of alcohol.
* Check the percentage of the fluoride.
* Check the Total Fatty Matter percentage (TFM %).

A

Check the Total Fatty Matter percentage (TFM %).

37
Q

When a liquid is distilled, tiny glass beads are sometimes place in the distillation flask. What is the reason for using the beads? The beads:
* make the liquid distills faster
* conduct heat away from the flame
* allow smooth boiling
* absorb impurities

A

allow smooth boiling

38
Q

What separation technique is useful in determining the antibodies that could fight diseases and viruses?
* Magnetic Separation Technique
* Filtration
* Chromatography
* Fractional Distillation

A

Chromatography

39
Q

To remove salt from the mixture of ground mothball and salt, which method is applicable?
* flotation
* sublimation
* use of centrifuge
* filtration

A

sublimation

40
Q

Seeing different materials floating on a river would display what physical property of matter?
* Solubility
* Combustibility
* Flammability
* Density

A

Density

41
Q

During birthdays, spaghetti has been the most requested food at home. You are told to remove the pasta from the pan with hot water. As a STEM student, what separation technique will you apply?
* Let the mixture of pasta and water to cool off then get a spoon to remove the water.
* Heating further to let the water evaporate.
* Use a strainer to easily separate the pasta from the hot water.
* Pick the pasta one by one so you could separate it from the hot water.

A

Use a strainer to easily separate the pasta from the hot water.

42
Q

Which property determines whether one substance will sink or float in another substance?
* Density
* Texture
* Volume
* Temperature

A

Density

43
Q

In what manner is chemistry of immediate use to a farmer?
* in soil conservation
* in the use of plant fertilizers
* in the growing technique
* in selecting what crops to plant in the farm

A

in the use of plant fertilizers

44
Q

It happens when a substance undergoes changes in its composition.
* mechanical change
* chemical change
* physical change
* visible change

A

chemical change

45
Q

Which should NOT be considered in buying products?
* Components of the product
* Cost of the product
* Quality of the product
* Commercial Ads of the product

A

Commercial Ads of the product

46
Q

Once carbon dioxide is absorbed by the seawater, an ample amount of chemical reactions will occur that increases the concentration of hydrogen ions. If this will continue, what will be the effect in the seawater?
* Decrease of oxygen content in the water that leads to death to fishes.
* The contamination of water leads to water pollution.
* A high amount of metals will result in the water surface.
* Acidification due to increasing of hydrogen ions causing the water to become too acidic.

A

Acidification due to increasing of hydrogen ions causing the water to become too acidic.

47
Q

Which of the following is the active component of detergent that do the job of linking water and dirt?
* Triclosan
* Citric acid, copper and zinc
* Surfactant
* Benzalkonium chloride

A

Surfactant

48
Q

Which of the following problems and issues has no chemical basis?
* ozone depletion
* earthquake
* global warming
* acid rain

A

earthquake

49
Q

Which among the choices would recognize the importance of chemistry behind the products that we are using daily?
* Chemistry deals with the properties of matter only
* Chemistry focuses on the components of materials and its reaction to other materials that lead to many products.
* Products has no business with chemistry at all.
* Chemistry just give facts without experimental basis.

A

Chemistry focuses on the components of materials and its reaction to other materials that lead to many products.

50
Q

Due to pandemic corona virus, we are opt to use hand sanitizer to cleanse our hands every time we are out or at home. What precaution should you always remember in the proper use of sanitizer?
* It could worsen allergies because its non - toxic.
* It is costly so better use in small amount.
* Use it in an ample amount to ensure protection against viruses.
* Its flammability and toxicity

A

Its flammability and toxicity

Reviewer (31 decks)

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