GRE Analytical Chemistry: Analyzing Data

This is an MCQ-based quiz for GRE on the topic of Analyzing Data.

This includes analysis providing chemical or physical information about a sample. The component in the sample of interest to us is called the analyte, and the remainder of the sample is the matrix. In an analysis, we determine an analyte's identity, concentration, or properties.

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Michael buys several bags of balloons. On the package, it says that each bag has 100 balloons. He opens the bags and only one of them has 100 balloons inside; the other bags either have too many or too few. How would you describe the bag of balloons with 100 balloons inside?

Precise, but not accurate Accurate, but the precision cannot be determined Accurate, but not precise Neither accurate nor precise Both accurate and precise

Michael"s scale measures the mass of objects as consistently less than their actual mass. How would you describe the scale?

It is neither accurate nor precise It is precise, but not accurate It is accurate, but not precise It is both accurate and precise Accuracy and precision are synonyms

A bowman is shooting arrows at a target. Which of the following demonstrates high accuracy but low precision?

The bowman consistently hits around the target but never hits the bullseye The bowman consistently hits the bullseye The bowman consistently hits to the left of the target The bowman consistently misses the target and hits a tree in the same spot The bowman consistently hits to the right of the bullseye

Which of these is an example of high precision?

An archer hits the same spot on the target three times in a row A student correctly calculates the mass of an object to be 54kg A student correctly calculates the acceleration due to gravity to be A student tries to throw a pencil into the garbage can and makes it in An archer hits the bulls-eye

Which of these is an example of high accuracy?

An archer hits the same spot on the target three times in a row An archer hits the bulls-eye A student repeatedly calculates the mass of an object to be 49 grams, when the true mass is 52 grams A student calculates the acceleration due to gravity to be using three different methods A student throws three pencils into the trash can, but misses and hits the window each time

Robert conducted an experiment in which he investigated how much water a paper towel could absorb. Initially, Robert found that one paper towel can absorb 12.8g of water. Later he found that his scale was not calibrated, so he had to repeat the experiment. After repeating the experiment with a new scale, Robert found that one paper towel can actually absorb 32.9g of water. What is the approximate percent error between the findings of the first and second experiments?

30%

72%

20%

61%

157%

A reaction between one mole of sodium and one mole of chloride should yield 42 grams of sodium chloride. In your experiment, the actual yield is 32.73 grams. Calculate the percent error of your experiment.

19.84%

15.42%

22.07%

24.07%

In the following reaction, eight moles of sodium hydroxide is broken down into four moles of sodium oxide and four moles of water. What is the percent error if your experiment yields 195 grams of sodium oxide?
2NaOH ------->Na2O + H2O

25.50%

19.23%

22.42%

21.37%

If a given sample of silver and flourine ideally combine to form 0.6mol of AgF, what is the percent error if the actual yield is 43 grams?

40.62%

43.57%

51.37%

53.62%

A brand of fruit snacks claims that each bag of fruit snacks has a mass of 25.5g. After weighing three bags, Wally observes the masses to be 25.5g, 25.6g, and 26.1g.

How can Wally describe the accuracy and precision of the first bag he measured?

Neither accurate nor precise

Accurate, but not precise

Accurate and precise

Precise, but not accurate

There are insufficient data points to draw a conclusion

Quiz/Test Summary

Title: GRE Analytical Chemistry: Analyzing Data

Questions: 10

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