Chemistry Midterm Review

Chemistry is the study of matter. What is matter?

• Anything that has mass and takes up space

• A form of energy

• A type of chemical reaction

• A state of equilibrium

Tags

NGSS.MS-PS1-5

What is the difference between precise and accurate?

• Precision refers to how close measurements are to each other, while accuracy refers to how close measurements are to the true value.

• Precision and accuracy both refer to how close measurements are to the true value.

• Precision refers to how close measurements are to the true value, while accuracy refers to how close measurements are to each other.

• Precision and accuracy both refer to how close measurements are to each other.

What is the difference between a qualitative and quantitative observation?

• Qualitative observations are descriptive and involve characteristics that cannot be counted, while quantitative observations are numerical and can be measured.

• Qualitative observations are numerical and can be measured, while quantitative observations are descriptive and involve characteristics that cannot be counted.

• Both qualitative and quantitative observations are numerical and can be measured.

• Both qualitative and quantitative observations are descriptive and involve characteristics that cannot be counted.

How are physical changes different from chemical changes? Give an example of each.

Evaluate responses using AI:

OFF

Tags

NGSS.MS-PS1-4

What is the formula for density?

In an experiment, what is the independent variable?

• The variable that is changed or controlled

• The variable that is measured

• The variable that remains constant

• The variable that is dependent on other variables

Tags

NGSS.MS-PS3-4

In an experiment, what is the dependent variable?

• The variable that is changed or controlled

• The variable that is measured

• The variable that remains constant

• The variable that is not used

Tags

NGSS.MS-PS3-4

In an experiment, what is the controlled variable?

• The variable that is changed or manipulated

• The variable that is measured

• The variable that is kept constant

• The variable that is dependent on other variables

How are these numbers written in scientific notation? Circle the largest number.

• 0.000003 = 3.0 x 10^-6

• 0.0000000003 = 3.0 x 10^-10

Use your calculator to solve 3.0 x 10^8 / 6.25 x 10^-7. Use parentheses and the EE button on your calculator.