ACT-Test American College Testing: English, Math, Reading, Science, Writing - Practice Questions

Question 13 (Science)

A mixture that is made by dissolving one compound (solute) in another (solvent) is called a solution. The amount of solute that can be dissolved in a solvent at a given temperature is called solubility. For most substances, solubility increases with temperature. When the amount of solute dissolved in a solvent exceeds the solubility, the solution is called supersaturated. Rock candy can be made by dissolving as much sugar in water, as solubility would allow at a high temperature, and then slowly cooling the solution to room temperature. If a thin string is dipped into it and left in the solution, the sugar in excess of the solubility at room temperature will form sugar crystals around the string, making the sweet rock candy. The solubility (in grams of sugar per

100 grams of water) as a function of temperature (in degrees Celsius) is plotted in the graph below.

Solubility is defined as:

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a supersaturated mixture.
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a mixture that is made by dissolving a solute in a solution.
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the amount of solute that can be dissolved in a solvent at a given temperature.
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the temperature that causes super saturation.

Question 14 (Math)

Which of the following expressions is a factor of x3 − 64?

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x − 4
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x + 4
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x + 64
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x2 + 16
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x2 − 4x + 16

Question 15 (Math)

A rectangle with a perimeter of 30 centimeters is twice as long as it is wide. What is the area of the rectangle in square centimeters?

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15
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50
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200
D.
E.

ACT-Test – American College Testing: English, Math, Reading, Science, Writing