CHEM Unit 1 Prep

Define precision and accuracy and provide an example of each.

• Precision: The ability to hit the bullseye on the target in archery. Accuracy: The consistency of hitting the same spot on a target in archery.

• Precision: The ability to throw a football accurately. Accuracy: The consistency of hitting the same spot on a target in archery.

• Precision: The consistency of hitting the same spot on a target in archery. Accuracy: Hitting the bullseye on the target in archery.

• Precision: The consistency of hitting the same spot on a target in archery. Accuracy: The ability to throw a football accurately.

Explain the importance of precision and accuracy in measurements.

• Precision is important but accuracy is not necessary

• Precision and accuracy are not important in measurements

• Accuracy is important but precision is not necessary

• Both precision and accuracy are important for obtaining reliable and consistent results in scientific experiments and real-world applications.

Discuss a real-life application where precision and accuracy are crucial.

• In the field of medicine

• In the field of gardening

• In the field of fast food service

• In the field of professional sports

Provide an example of a situation where precision is more important than accuracy, and vice versa.

• In construction, precision is more important than accuracy.

• In cooking, precision is more important than accuracy.

• In sports, precision is more important than accuracy.

• In the field of medicine, precision is more important than accuracy.

Definition of accuracy

• The color of a calculated quantity
• The speed of a measurement
• Degree of conformity of a measured or calculated quantity to its actual value
• The amount of data collected

Definition of precision

• Level of exactness or accuracy in a measurement or calculation
• The color of an object
• The speed of an object
• Amount of force applied to an object

Determining the number of neutrons in an atom of the element Oxygen (Hint: Round the atomic mass to 16).

• 8
• 4
• 10
• 6

The atomic mass of an element depends upon the ____.

• number of electrons
• atomic number
• number of isotopes
• number of protons and neutrons; the relative abundance of each isotope

 The electron configuration of calcium is

• 1s2 2s2 2p6 3s2 3p5 4s2
• 1s2 2s2 2p6 3s1 3p6 4s2
• 1s2 2s2 2p6 3s2 3p6 4s1
• 1s2 2s2 2p6 3s2 3p6 4s2

The electron configuration for Neon

• 1s2 2s1 2p5
• 1s2 2s2 2p6
• 1s2 2s2 2p4
• 1s2 2s2 2p3