Which polyatomic ion is found in the compound represented by the formula NaHCO3?(1) acetate (3) hydrogen sulfate
(2) hydrogen carbonate (4) oxalate

Answers

Answer 1

Answer:

Answer: The correct option is 2.

Explanation: Polyatomic ions are defined as the ions in which two or more elements are covalently bonded to act as a single unit. They always carry some charge.

Examples of polyatomic ions are: $OH^-$ known as hydroxide ion, $SO_4^(2-)$ known as sulfate ion

We are given a compound $NaHCO_3$ having 2 ions which are $Na^+$ and $HCO_3^-$ . these ions are named as sodium ions and hydrogen carbonate ions.

Therefore, the correct option is 2.

Answer 2

Answer: The correct answer is option 2. Hydrogen carbonate is the polyatomic ion in the compound given. A polyatomic ion is a charged species composed of covalently bonded atoms. Hydrogen carbonate, also known as bicarbonate, is a polyatomic ion with the charge of -1.

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At normal atmospheric pressure, water freezes at:a. -20 °C
b. 0 °C
c. 100 °C
d. 120 °C

Answers

Water will freeze at 0°C so the answer is b

Hi there! Your answer would be B. 0°C. Just like water at a lake, that water is a liquid and when it freezess it eventually becomes a solid. Now, you could ice skate on the lake, but make sure that the water is absolutely frozen.

In the electron cloud model, electrons are said to be moving so fast that a person can _____.

Answers

Answer: Not determine their exact position.

Explanation: In the electron cloud model, electrons are said to be moving so fast that a person cannot determine their exact position.

This phenomenon goes well off with the Heisnberg Uncertainity Principle (HUP)which states that the momentum (Δm) and position (Δx) of an obejct cannot be determined simultaneously at the same time.

The mathematical relation of HUP is -

Δx Δm ≥ h/ 4π

where h = Planck's Constant

cannot describe their exact position.

What is the volume of a tank of nitrogen if it contains 17 moles of nitrogen at 34 C under 12,000 Pa?