Chemistry Chapter 3 Test

What is the purpose of using significant figures in scientific measurements?

• To express the degree of uncertainty in measurements

• To make numbers look more complex

• To simplify calculations

• To convert units easily

In scientific notation, what is the range for the coefficient?

• Greater than or equal to 0 and less than 10

• Greater than or equal to 1 and less than 10

• Greater than or equal to 1 and less than 100

• Greater than or equal to 0 and less than 100

What must be compared to evaluate the accuracy of a measurement?

• The measured value and the correct value

• The measured value and the estimated value

• The measured value and the average value

• The measured value and the smallest value

What is the formula for calculating percent error?

• (error / measured value) × 100%

• (|error| / measured value) × 100%

• (error / accepted value) × 100%

• (|measured value - accepted value| / accepted value) × 100%

• (|error| / accepted value) × 100%

Which of the following is an intensive property that depends only on the composition of a substance?

• Density

• Weight

• Volume

• Mass

What is the conversion formula from Celsius to Kelvin?

• K = °C + 273

• K = °C - 273

• K = °C × 273

• K = °C / 273

What is dimensional analysis used for in problem-solving?

• To solve conversion problems by changing units

• To measure the density of a substance

• To calculate percent error

• To determine significant figures

What is the primary purpose of using scientific notation in calculations?

• To simplify the representation of very large or very small numbers

• To increase the precision of measurements

• To convert units between different systems

• To ensure all numbers have the same number of significant figures

What is the significance of using a control variable in an experiment?

• To ensure the experiment is repeatable

• To isolate the effect of the independent variable

• To increase the accuracy of the results

• To provide a baseline for comparison

What is the purpose of a hypothesis in scientific research?

• To provide a summary of the research findings

• To offer a testable prediction based on observations

• To list all variables involved in the experiment

• To ensure the experiment is conducted ethically