Unit 4 Review S2025

Which of the following is a statement of the law of conservation of energy?

• Energy can be created and destroyed.

• Energy cannot be created or destroyed, only transformed.

• Energy is always lost as heat.

• Energy is only conserved in closed systems.

What is the trend in atomic radius as you move from left to right across a period in the periodic table?

• It increases.

• It decreases.

• It remains constant.

• It fluctuates randomly.

Calculate the amount of heat absorbed by 50 g of water when its temperature increases from 20°C to 30°C. (Specific heat capacity of water = 4.18 J/g°C)

• 209 J

• 418 J

• 2090 J

• 4180 J

Which of the following is the correct electron configuration for a neutral atom of oxygen?

Tags

NGSS.HS-PS1-1

Which type of bond involves the transfer of electrons from one atom to another?

• Covalent bond

• Ionic bond

• Metallic bond

• Hydrogen bond

Explain why the ionization energy generally increases across a period in the periodic table.

• Electrons are added to the same energy level, increasing nuclear charge.

• Electrons are added to higher energy levels, decreasing nuclear charge.

• Electrons are removed from the same energy level, decreasing nuclear charge.

• Electrons are added to lower energy levels, increasing nuclear charge.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A 100 g sample of a metal absorbs 500 J of heat, and its temperature rises by 10°C. What is the specific heat capacity of the metal?

• 0.5 J/g°C

• 1.0 J/g°C

• 5.0 J/g°C

• 10.0 J/g°C

Tags

NGSS.HS-PS3-4

Which of the following elements has the highest electronegativity?

• Fluorine

• Oxygen

• Nitrogen

• Chlorine

Tags

NGSS.HS-PS1-2

Describe the difference in electron sharing between ionic and covalent bonds.

• Ionic bonds involve equal sharing; covalent bonds involve transfer.

• Ionic bonds involve transfer; covalent bonds involve equal sharing.

• Ionic bonds involve unequal sharing; covalent bonds involve transfer.

• Ionic bonds involve equal sharing; covalent bonds involve unequal sharing.

• Pyramidal

• Trigonal planar

• Tetrahedral

• Bent