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3 years ago

4. In an atomic model, what particles are found in the area surrounding the nucleus?

Chemistry

2 answers:

MAVERICK [17]3 years ago

5 0

4. The particles found outside the nucleus are the electrons.

KIM [24]3 years ago

5 0

The answer to #5 is :They are found in different places because electrons are negatively charged so they repel each other.

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Write a description of how you know a chemical reaction is occurring.

Sladkaya [172]

Answer:

See explanation

Explanation:

Chemical reactions are also referred to as chemical change. A chemical change often leads to the formation of new substances and is not easily reversible.

A chemical reaction may be accompanied by the emission of heat and light, formation of a precipitate, evolution of gas, or a color change.

These observable physical effects may tell us weather a chemical reaction has taken place or not so we have to observe the system closely for any of these effects stated above.

4 0

3 years ago

3. You have 28.5 grams of Carbon. How many atoms is this?

Anton [14]

1 gram of carbon = 12 atoms ..

As per u r question..

28.5 × 12 = 342..

<h2 /><h2>If this answer helps you mark as brainlist..</h2>

6 0

3 years ago

What quantity of copper is deposited by the same quantity of electricity that deposited 9g of aluminum

klio [65]

Answer:

Mass of copper deposited = 31.75 g

Explanation:

According to Faraday's second law of electrolysis, when the same quantity of electricity is passed through different electrolytes, the relative number of moles of the elements deposited are inversely proportional to the charges on the ions of the elements.

From this law, it can be seen that the higher the charge, the lower the number of moles of a given element deposited.

Number of moles of aluminium in 9 g of aluminium = mass / molar mass

Molar mass of aluminium = 27 g

Number of moles of aluminium = 9/27 = 1/3 moles

Charge on aluminium ion = +3

3 moles of electrons will discharge 1 mole of aluminium,

1 mole of electrons will discharge 1/3 moles of aluminium

Number of moles of electrons involved = 1 mole of electrons

Charge on copper ion = +2

1 mole of electrons will discharge 1/2 moles of copper.

Mass of 1/2 moles of copper = number of moles × molar mass of copper

Molar mass of copper = 63.5 g

Mass of copper deposited = 1/2 × 63.5 = 31.75 g

3 0

3 years ago

There are long, underwater mountain chains that divide the sea

natima [27]

Mid-Ocean Ridges

Two examples of Mid-Ocean Ridges are the Mid-Atlantic Ridge and the East Pacific Rise.

Explanation:

Mid-ocean ridges are mountain-like geographical features on the ocean floor. They usually line along the divergent boundaries of tectonic plates moving away from each other. This is because as the plates move in opposite direction, the vacuum in between the plates is filled by upwelling magma from the mantle. Usually the texture of the rocks that form these mountain ridges has bands. This is because, before the magma cools, the iron in the magma (due to its ferromagnetic property) aligns with the earths magnetic field. The earth magnetic flux flips over several 1000 years hence these bands orient themselves differently depending on the magnetic field orientation at the time they were formed.

Learn More:

For more on mid-ocean ridges check out;

brainly.com/question/7666628

#LearnWithBrainly

4 0

3 years ago

¿por qué la química es considerada una ciencia natural?

cricket20 [7]

A la química a veces se le llama "la ciencia central", porque une la física con otras ciencias naturales, como la geología y la biología. La química es el estudio de la materia y sus propiedades.

Mi mala si esto no ayuda

8 0

3 years ago