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GENC MOD 1-3 > PRE TEST > Flashcards

PRE TEST Flashcards

1
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?

A

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

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2
Q

Which among the choices would recognize the importance of chemistry behind the products that we are using daily?

A

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

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3
Q

Which of the following is a chemical property of water?

A

Reacts violently with sodium and expands when it freezes

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4
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?

A

Flammability and combustibility of materials

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5
Q

What possible separation technique is used if the miscible liquids have asignificant difference in boiling points generally 70°C?

A

SIMPLE DISTILLATION

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6
Q

Which separation technique is used in a mixture of immiscible liquids?

A

DECANTATION

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7
Q

In what manner is chemistry of immediate use to a farmer?

A

USE OF FERTILIZERS

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8
Q

How will you know if the soap you are choosing is good or not good for bathing?

A

Check the Total Fatty Matter percentage (TFM %).

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9
Q

Which of the following sets of properties are all extensive properties of a substance?

A

MASS, VOLUME, HEIGHT

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10
Q

It happens when a substance undergoes changes in its composition.

A

CHEMICAL CHANGE

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11
Q

Which should NOT be considered in buying products?

A

COMMERCIAL ADS OF THE PRODUCTS

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12
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?

A

DENSITY

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13
Q

To remove salt from the mixture of ground mothball and salt, which method is applicable?

A

SUBLIMATION

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14
Q

Which group contains an element, a mixture and a compound?

A

SEAWATER, LEAD, AMMONIA

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15
Q

Which physical test can be used to distinguish between a solution and a colloid?

A

TYNDALL EFFECT TEST

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16
Q

Which type of mixture is used in separating its components by decantation?

A

HETEROGENEOUS MIXTURE

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17
Q

With the current situation, which best option below will help you ensure safety in choosing and buying chemical products that are sold online?

A

SEARCH FOR THE MATERIAL SAFETY DATA SHEET OF THE PRODS

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18
Q

Which of the following is the active component of detergent that do the job of linking water and dirt?

A

SURFACTANT

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19
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?

A

CHROMATOGRAPHY

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20
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?

A

POLARITY

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21
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?

A

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

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22
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

A

ALLOWS SMOOTH BOILING

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23
Q

What separation technique is useful in determining the antibodies that could fight diseases and viruses?

A

CHRIMATOGRAPHY

24
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?

A

OXYGEN

25
Q

When water and kerosene were mixed, the kerosene floats on the water. What physical property of the material is behind this?

A

FLAMMABILITY AND POLARITY
(EITHER OF THE 2)

26
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?

A

CHROMATOGRAPHY

27
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?

A

FLAMMABILITY AND TOXICITY

28
Q

Which of the following problems and issues has no chemical basis

A

EARTHQUAKE

29
Q

Why an iron does is classified as an element? Because it

A

IT HAS NEVER BEEN DECOMPOSED

30
Q

What type of property of matter is Galvanized Iron sheet?

A

CHEMICAL PROP > REACTIVITY AND FLAMMABAILITY

31
Q

Which among the consumer products links water and dirt?

A

SOAP OR DETERGENT

32
Q

Which of the following consumer products has citric acid, copper and zinc as its active component?

A

SURGICAL FACEMASKS

33
Q

What is the reason for recycling or reusing plastics?

A

DO NOT DECOMPOSE EASILY

34
Q

What laboratory apparatus can be used in executing the decantation technique of separating the components of mixtures?

A

SEPARATORY FUNNEL

35
Q

Which of the following would require knowledge of chemistry?

A

URINALYSIS

36
Q

Which of the following statements would display a wise consumer?

A

Planning purchases in advance, comparing products and doing research.

37
Q

Why is freon continuously used as coolant despite protests from environmentalists?

A

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

38
Q

Seeing different materials floating on a river would display what physical property of matter?

A

DENSITY

39
Q

All of the following are applications of chemistry in the area of food production EXCEPT one. Which is the exception?

A

study of income derived from rice production

40
Q

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

A

DISTILLATION AND FILTRATION

41
Q

Which property makes it possible for a metal to be made into sheets?

A

MALLEABILITY

42
Q

What makes a hand sanitizer a fire hazard?

A

ALCOHOL CONTENT

43
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?

A

THERMAL CONDUCTIVITY

44
Q

How do you correctly bring down the mercury level of a laboratory thermometer to zero degree Celsius?

A

PUT THE BULB IN ICE WATER

45
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?

A

HYDROGEN GAS

46
Q

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

A

DISTILLATION

47
Q

Which property determines whether one substance will sink or float in another substance?

A

DENSITY

48
Q

Which of the following elements is a metal that easily melts and burns with a yellow flame?

A

SODIUM

49
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?

A

SUBLIMATION

50
Q

What property of a liquid enables you to decide about its purity?

A

HAS A CONSTANT BOILING TEMPERATURE

51
Q

THIS THE PRODUCT AND IT IS COMPOSED OF 2 OR MORE SUBSTANCES

A

SOLUTION

52
Q

These are the substances that dissolves in a Solution. (Solid)

Example: Ito yung mababasa

A

SOLUTE

53
Q

These are usually liquid ubstances that has the ability to dissolve Solute

A

SOLVENT

54
Q

Glu-like substances

A

COLLOID

55
Q

Separation Technique:
From solid to gas

A

SUBLIMATION

56
Q

If a person is allergic to Latex gloves, what should be the alternative?

A

USE NITRILE GLOVES

GENC MOD 1-3 (1 decks)

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