Fall 2024 Midterm Exam

In an experiment to test how different fertilizers affect plant growth, three groups of plants receive different fertilizers. The researcher measures the height of the plants after 30 days.
What is the independent variable?

• Type of plant

• Amount of fertilizer

• Time of growth

• Height of the plant

Tags

NGSS.MS-ETS1-1

How many significant figures are in the value: 0.00245?

• 5

• 6

• 3

• 4

Which element has 8 protons?

• Carbon

• Nitrogen

• Oxygen

• Fluorine

How many neutrons are in an atom of Sulfur-34?

• 18

• 16

• 34

• 32

Which of the following best describes the electron cloud in an atom?

• A dense, positively charged region at the center

• A region where neutrons are located

• A cloud of particles that includes both electrons and neutrons

• A region around the nucleus where electrons are likely to be found

Boron has two naturally occurring isotopes: Boron-10 (10.01 amu) with an abundance of 19.8%, and Boron-11 (11.01 amu) with an abundance of 80.2%. What is the average atomic mass of boron?

• 10.01 amu

• 10.81 amu

• 9.50 amu

• 11.01 amu

Which isotope has more neutrons: Oxygen-16 or Oxygen-18?

• Oxygen-16

• Both have the same number of neutrons

• Oxygen-18

What is the noble gas configuration for calcium?

• [He] 2s² 2p⁶ 3s²

• [Ne] 3s² 3p⁶ 4s²

• [Kr] 4d²

• [Ar] 4s²

Tags

NGSS.HS-PS1-1

Which of the following is the electron configuration for iron?

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁶

Tags

NGSS.HS-PS1-1

How many unpaired electrons are present in the orbital diagram for nitrogen

• 4

• 3

• 7

• 1

Tags

NGSS.HS-PS1-1