What is the controlled variable in the investigation? 1. the temperature of the water 2. the amount of sugar 3. the length and time that sugar completely dissolves in hot water 4. the length of time that sugar is completely dissolved in cold water?

The controlled variable is 2

Explanation:

1 is the independent variable because the temperature of the water varies.

3 and 4 are the results of the change that was done to the independent variable.

2 is the controlled variable because the amount of sugar is the same.

A group of students was asked to investigate how fast sugar dissolves in cold and in hot water.

1.If this is going to be fair test, what variables should they control

A. Amount of water and sugar in each cup, method of suunng, time when the solid is added to water,

how long each solution is stirred

B. Amount of water and sugar in each cup.inethod of surong, how long each solution is stirred

C Amount of sugar in each cup. method of suring, time when the solid is added to water, how long

each solution is stirred

D Amount of water in each cup method of stirring, ume when the solid is added, how long each

solution is stirred

2. What is the dependent variable?

I The temperature of water.

II. The amount of sugar

III The length of time the sugar completely dissolves in hot water

IV The length of time the sugar completely dissolves in cold water

A. I only

B. II only

C. III and IV

D Il and I

3. What is the independent variable in the investigation?

A I only

B. II and

C. II and III

D. II,III and IV

4 Which of the following statement is an interence or interpretation based on observation?

A. Ripe bananas are yellow

B. Unripe bananas are green

C. Ripe bananas have sweet taste

D. The ripening of bananas involve a chemical change

5. A glass of water has a temperature that is between 35 C and and Which of the following thermometers

can give the most accurate reading?

A. alcohol thermometer (0 to100°C range)

B mercury thermometer (-25 to 200°C range,

C. clinical thermometer (35°C to 40 °C range)

D. alcohol thermometer (-50°C to 50°C range)

6. In doing investigatory studies we use the steps of scientific method which include the ff. :

I. Formulating hypothesis

II. Identifying ghr problem

III. Gathering Data

IV. Testing hypothesis

V. Verifying Conclusion

VI. Formulating the conclusion

Which of the ff. is the correct sequence of the steps in scientific method?

A. I,II,III IV V VI

B. II III I IV VI V

C. VI V IV III II I

D. V VI IV I III II

No, the two solutions were of different concentrations.

Mass%=  

(massofsolute+massofsolvent)

massofsolute

​  

×100

Solution made by Ramesh-

Mass%=  

(100+10)

10

​  

100=  

110

10

​  

×100=9.09%

Solution made by Sarika-

Mass%=  

100

10

​  

×100=10%

∴ Both have different concentrations.

Explanation:

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answer:

light scattering inside the bubble.

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