science quiz contest

QUIZ CONTEST

Question #1

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Which does not belong to the group?a. Boiling pointb. Flammabilityc. Hardnessd. Metallic Properties

ANSWER

b. FlammabilityAll are physical property except

flammability which is a chemical property.

Question #2

It is the ability of a material to be drawn into

wires.

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ANSWER

DuctilityAn example is copper.

Question #3

Which of the following has the highest melting point?

a. Iceb. Copperc. Butterd. Iron

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ANSWER

d. Iron – 1,535°CIce - 0°C

Copper – 1,083°CButter - 32°C

Question #4

Which of the following is a chemical property?

a. Crushing of stonesb. Burning of woodsc. Cracking an eggd. Boiling of water Time starts now...

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ANSWER

b. Burning of woodsPhase change is physical change.

Question #5Which does not belong to the group?

a. Salt solution (completely dissolved particles)

b. Oil and waterc. Alcohol and water

d. Sugar dissolved in waterTime starts now...

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ANSWER

b. Oil and waterAll are homogeneous mixture. Oil and

water is a heterogeneous mixture.

Question #6

It is a combination of two or more substances

that are physical combined. Time starts now...

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ANSWER

Mixture

Question #7Which does not belong to the group?

a. Nature of solute and solventb. Temperature

c. Pressured. Saturation point

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ANSWER

d. Saturation PointThe first three are factors affecting

solubility.

Question #8

This is the substance which is dissolved in the solvent.

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ANSWER

Solute

Question #9

It is a solution which contains solutes that do not dissolve anymore.

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ANSWER

Supersaturated Solution

Question #10

Which is an example of a gas in liquid?

a. Carbonated drinksb. Dental amalgam

c. Aird. Steel

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ANSWER

a. Carbonated Drinks

Question #11

Which of the following mineral is the hardest?a. Talc

b. Quartzc. Topaz

d. Diamond

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ANSWER

d. DiamondThe choices are arranged in

increasing hardness.

Question #12

Which of the following is not a method of separating the components of a mixture?

a. Filtrationb. Decantation

c. Stirringd. Evaporation

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ANSWER

c. Stirring

Question #13

It is a type of mixture that separates on standing.

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ANSWER

Suspension

Question #14

Which is not an example of emulsion?

a. Milkb. Whipped Cream

c. Face Creamd. Mayonnaise

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ANSWER

b. Whipped CreamIt is a foam.

Question #15

Which of the following is an example of sol?

a. Spray deodorantb. Colored gems

c. Bloodd. Butter

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ANSWER

c. BloodSpray deodorant is an aerosol. Colored

gems are solid sol. Butter is a solid emulsion.

Question #16

Compute for the percent by volume of 13mL of alcohol in 57mL of water.

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ANSWERSolution:

Volume of solution = 13 mL + 57mL= 70mL

%volume = (13mL/70mL) x 100

= 18.57%

Question #17

What is the percent by mass of 6.2g of alum dissolved in a 412.7mL of

water? (Note: 1mL = 1g)

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ANSWERSolution:Conversion: 412.7mL = 412.7gMass of solution = 6.2g + 412.7g

= 418.9%mass = (6.2g/418.9g) x 100

= 1.48%