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Could you pass a chemistry STAAR test?

By Victoria Advocate
Nov. 26, 2011 at 5:26 a.m.


The following questions released by the Texas Education Agency were adapted from a chemistry STAAR test.

Questions:

1. Which of the following elements has the smallest atomic radius: sulfur, chlorine, aluminum or sodium?

2. A gas was held at a constant temperature in a closed system. The initial pressure of the gas was 1.20 atm, while its initial volume was 2.30 L. The final volume of the gas was 1.50 L. What was the final pressure of the gas to the nearest hundredth of an atmosphere?

3. A chemistry student's investigation goes as follows: "The student obtains 15 g of an unknown substance. The student notes that at room temperature, the substance is a solid and is colored white. The student determines that the density of the substance is 2.17 g/cm cubed. The student then determines that the substance is soluble in water." The student determines that the unknown substance is sodium chloride. What is an extensive property of sodium chloride?

Answers

1. Chlorine, 2. 1.84

3. Mass of 15 g

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