Which polyatomic ion has a charge of 3-?

An electron's exact position cannot be pinpointed is the features of the electron cloud model of an atom. Therefore, option A is correct.

What is an electron cloud model ?

In 1926, Werner Heisenberg and ErwinSchrödinger created the electron cloud model. The model is a tool for aiding in the visualization of the electrons' most likely location within an atom.

The electron cloud model is another name for the contemporary theory. This is due to the fact that each orbital surrounding an atom's nucleus resembles a fuzzily arranged cloud.

According to definition, an electron cloud is the area around the nucleus of an atom where electrons are most likely to be found.

Thus, option A is correct.

To learn more about an electron cloud model, follow the link;

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Answer: a

Explanation:

A digital thermometer is more preferable than a liquid-based thermometer because it gives accurate data than the liquid thermometer. Liquid thermometer is affected by the temperature, and when it does, the liquid expands and so des the material covering the thermometer. For the digital thermometer, it has less error because it already has a sensor inside it that determines the temperature of the substance.

The answer is A

The bacteria that cause disease are known as pathogens. The term pathogen is used to refer to all types of disease causing microorganisms. These include  bacteria, fungi, protozoa and fungi.

Bacteria. Microscopic organisms that come in many shapes and sizes. Some bacteria that cause disease in man are Salmonella typhi which causes typhoid and Streptococcus pyogens which causes sore throat.

Virus. A virus is a microscopic entity much smaller than even bacteria and can only exist inside a host such as a cell. It cannot live on its own. Some viruses that cause disease are HIV which causes AIDS and  Rhino virus which causes colds.

Fungi.  These are a group of unicellular or multicellular microscopic organisms that live by feeding on organic matter. A type of fungus that causes disease  is Trichophyton mentagrophyte which is responsible for athlete's foot.

Protozoa. A group of one celled organisms which live in water. Entamoeba histolytica is a protozoa, an amoeba which causes amoebic dysentery in man.

Acid Rain is formed when chemicals in the air get into rain and up the acidity levels!!!!!!

Hope this helps guys!

Answer:

yes acid rain

Explanation:

Answer:

pH=8.32

Explanation:

The relevant equilibrium for this problem is

F⁻ + H₂O  ↔ HF + OH⁻

With a constant Kb of

Kb=

Kb=

To calculate the value of Kb we use the formula Kw=Ka*Kb, where Kw is the ionization constant of water, 1 * 10⁻¹⁴.

1 * 10⁻¹⁴ = 7.2*10⁻⁴ * Kb

Kb = 1.4 * 10⁻¹¹

So now we have

1.4 * 10⁻¹¹=

             We make the assumption that x<<<0.30 M, so we can rewrite the equation of Kb as:

1.4 * 10⁻¹¹=

So [OH⁻]=2.05*10⁻⁶

• pOH=5.68

• pH = 14 - pOH

• pH=8.32

Answer:0.0008 mmg

Explanation: