CHE 102 (Chapter 2)

Which of the following describes a measurement?

• Comparison to a standard

• Quantitative observation

• Qualitative observation

• Has a value and unit

What does a value display?

• The addition of the standard the object measures

• The multiple of the standard the object measures

• The certainty in a measurement

• The uncertainty in a measurement

Which of the following describes the scientific method?

• N x 10ⁿ

• N is some number and is known as the decimal part

• 10ⁿ is known as the exponent part

• N is some number and is known as the number part

Which of the following describes "n" correctly?

• If n is negative, it tells you how many times the decimal is multiplied by value of ten

• If n is positive, it tells you how many times the decimal is multiplied by value of ten

• If n is negative, it tells you how many times the decimal is divided by value of ten

• If n is positive, it tells you how many times the decimal is divided by value of ten

What is 340. in scientific notation?

• 3.40 x 10³

• 3.40 x 10¹

• 3.40 x 10⁵

• 3.40 x 10²

What is 7218.92 in scientific notation?

• 72.1892 x 10³

• 7.21892 x 10³

• 7.21892 x 10⁴

• 0.0721892 x 10⁷

What is 0.080 in scientific notation?

• 8 x 10^-2

• 8.0 x 10^-2

• 0.00080 x 10^-2

• 9 x 10^-2

What is 0.00309 in scientific notation?

• 3.09 x 10^-2

• 30.9 x 10^-7

• 3.09 x 10^-3

• 3.08 x 10^-4

Which of the following describes exact numbers and measured numbers?

• Exact - The exact value of a quality

• Measured - An instrument is used to compare a quantity of an object to a standard (certainty)

• Exact - The exact value of a quantity

• Measured - An instrument is used to compare a quality of an object to a standard (uncertainty)

Which of the following describes significant figures?

• All certain and estimated values in a measured number

• All uncertain and estimated values in a measured number

• All certain values in a measured number

• All uncertain values in a measured number