Answer: Option (D) is the correct answer.
Explanation:
When kinetic energy of falling water is converted to electricity then the generated power is called hydroelectric power.
In a hydroelectric plant, a reservoir is used to store water in a dam. This dam is located on a river. When water is released from this reservoir then it flows through the turbine. As a result, this turbine spins and activates a generator which produces electricity.
Thus, we can conclude that hydroelectric power is generated by converting the kinetic energy of falling water to electricity.
Figure 11 shows the results
time taken for amylase to produce glucose (s)
Test 4
120
125
110
115
Figure 11
() Calculate the rate of amylase enzyme activity for the 10% starch solution.
Answer:
Phenolphthalein is an indicator. It is pink in alkaline solutions and turns colourless as the pH decreases.
It can be used to measure the activity of the enzyme lipase on the breakdown of lipids.
Samples of milk containing phenolphthalein were incubated with lipase at different temperatures.
The time taken for the phenolphthalein to turn colourless was recorded and used to calculate the rate of enzyme activity.
Figure 10 shows these results.
Picture
(a) (i) Explain why phenolphthalein turns colourless when lipase breaks down the lipids in milk. (2)
(ii) Describe the effect of temperature on the activity of lipase, as shown in Figure 10. (2)
(iii) Explain why the activity of lipase changes above a temperature of 40°C. (2)
(b) A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at 37°C. The student repeated the investigation five times.
To calculate the rate of amylase enzyme activity for the 10% starch solution, divide the time taken for amylase to produce glucose by the total time elapsed. For each test, this rate can be expressed as the number of glucose molecules produced per unit of time.
The rate of amylase enzyme activity for the 10% starch solution can be calculated by determining the time taken for amylase to produce glucose. In this investigation, the time taken for amylase to break down the starch solution into glucose was recorded in seconds. To find the rate, divide the amount of glucose produced (in this case, the time taken) by the total time elapsed. For example, for Test 4, the time taken was 120 seconds. The rate of amylase enzyme activity can then be expressed as 1 glucose molecule produced per 120 seconds.
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Answer: Option (b) is the correct answer.
Explanation:
A compound in which atoms share electrons with each other are known as covalent compounds.
Since there are no strong intermolecular force of attraction between the atoms hence, there bond can be easily broken down.
Thus, we can conclude that out of the given options, the statement they have a low boiling point because of weak intermolecular forces.
Vinegar dissolve in water but oil does not because vinegar is polar like water, but oil is nonpolar and the correct option is option C.
The dissolving process depends on the polarity of the substances involved. Water is a polar molecule, meaning it has a positive and negative end, while vinegar contains acetic acid, which is also polar. Since both water and vinegar are polar, they can mix and dissolve in each other easily.
On the other hand, oil is nonpolar, meaning it lacks a positive and negative end. Because of this, oil cannot dissolve in water, which is polar. Instead, oil and water will separate into distinct layers. This phenomenon is due to the "like dissolves like" rule, where polar substances dissolve best in polar solvents and nonpolar substances dissolve best in nonpolar solvents.
Thus, the ideal selection is option C.
Learn more about Polar and nonpolar substances, here:
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