Write the Complex Number in Polar Form $- 5 i$ A) $5 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$

question 178

Multiple Choice

Write the complex number in polar form. Express the argument in degrees, rounded to the nearest tenth, if necessary.
- $- 5 i$

• A) \(5 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)\)
• B) \(5 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)\)
• C) \(5 \left( \cos 0 ^ { \circ } + \mathrm { i } \sin 0 ^ { \circ } \right)\)
• D) \(5 \left( \cos 270 ^ { \circ } + \mathrm { i } \sin 270 ^ { \circ } \right)\)

Explain the significance of the atomic structure in determining chemical properties and behaviors of elements.

Understand the concept of pH and its significance in solutions.

Identify and explain the properties and significance of atoms, including their mass and atomic number.

Distinguish between acids, bases, and buffers and their roles in chemical reactions.

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