midterm review_DC1

Which of the following statements about significant figures is true?

• All zeros are significant figures.

• Zeros at the beginning of a number are significant.

• All nonzero numbers are significant figures.

• A number in scientific notation shows all digits as significant.

How should the answer to the calculation (8.314)(3.160) be recorded in terms of significant figures?

• 26.3

• 26.27

• 26.270

• 26.2700

What does accuracy measure in scientific terms?

• How close your answer is to other answers.

• How close your answer is to the correct or accepted answer.

• How many significant figures are in your answer.

• How reproducible your answer is.

Tags

NGSS.HS-PS1-7

What is the correct way to read the volume of liquid in a graduated cylinder?

• Read the top of the meniscus.

• Read the bottom of the meniscus.

• Read from above the cylinder.

• Read from the side of the cylinder.

What is the characteristic property of matter that is analyzed for precision and accuracy in measurements?

• Volume

• Density

• Mass

• Temperature

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-5

Which type of mixture has the same composition throughout?

• Heterogeneous Mixture

• Homogeneous Mixture

• Compound

• Element

What is the term for atoms of the same element with different mass numbers?

• Ions

• Isotopes

• Molecules

• Compounds

What is the formula to calculate the number of moles?

• Mass (g) / Volume (L)

• Volume (L) / Molar Mass (g/mol)

• Mass (g) / Molar Mass (g/mol)

• Molar Mass (g/mol) / Mass (g)

What is the volume of one mole of a gas under the conditions of STP?

• 22.4L

• 24.0L

• 20.0L

• 18.0L

What is the formula for calculating percent error?

• [(measured value - true value) / true value] X 100%

• [(true value - measured value) / true value] X 100%

• [(measured value + true value) / true value] X 100%

• [(measured value - true value) / measured value] X 100%