List the methods of separation used in water purification...... ( HELP PLEASE )

Cooking materials are made of copper, aluminum, and iron because they contain free, mobile electrons owing to the metallic bond.

Metallic bonding involves a sea of electrons that is bonded to metal cations by electrostatic attraction. The electrons in the metallic bond are free to move around the material.

Because there are free electrons, when the material is heated, the electrons receive energy and move faster, this energy spreads throughout the material by conduction.

Hence, good conductors of heat such as copper, aluminum, and iron are used for cooking materials.

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Answer:

It's motor oil and brake fluid

Answer:

When a liquid changes to gas, the particles absorb heat energy and they start vibrating faster and distance between them increases. On constant vibration, intermolecular forces decrease and particles start moving away from each other and change to gas.

1. a

2. a

3. b

4. b

5. c

6. a

7. c

Answer:

"like-dissolves-like"

Any polarized molecule will not be soluble in a mixture of non-polarized molecules. Also, Acids and Bases mix with one another but not into neutral compounds. Organic molecules also do not mix with non-organic or aqueous solutions (like those without neutral pH)

Explanation:

Answer: True

Explanation:

If you’ve seen a baseball game, you’ve probably also experienced the sight of a ball going up and up, until you begin to wonder when it’s going to come down! Yet every time, the ball does fall back to earth. Why? Gravity is an attractive force that exerts a pull between two objects, such as a baseball and the earth.

Explanation:

the units for the rate constant of a first-order reaction is :

[tex] = {s}^{ - 1} [/tex]

Answer: (although the question does not sate whether if you separate them physically or through energy. so i did both)

1. can be separated (When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen)

2. can be separated, but through electrolysis, fiscally moving a crane to generate electricity to separate the molecules

3. Most solid particles, composed of diamagnetic or weak paramagnetic materials, cannot be extracted by a conventional magnetic separator. physically cannot be separated. but through heat yes

4. but there is a catch: doing so requires energy. ... If energy from coal were applied to drive the decomposition reaction, more CO2 would be released than consumed, because no process is perfectly efficient. so it cant be separated physically

5. it can be separated but it needs energy physically cannot be separated.

Explanation:

Answer:

There are significant environmental impacts associated with coal mining and use. It could require the removal of massive amounts of top soil, leading to erosion, loss of habitat and pollution. Coal mining causes acid mine drainage, which causes heavy metals to dissolve and seep into ground and surface water.

Explanation:

Answer:fluorine

Explanation:

Based on location in the periodic table, fluorine (F) has chemical properties that are most similar to iodine.

In the periodic table, elements are classified in groups and periods. The elements in the same group are chemically similar and they have the same number of valence electrons. Elements in the same period have the same highest energy level.

Hence, when looking for an element that is most chemically similar to iodine, we have to consider the element that is in the same group with iodine.

Both fluorine are iodine are both in group 17 hence, fluorine is most chemically similar to iodine.

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Answer:

A substance that neutralizes an acid is generally called a base and the basic substances that are soluble in water and alkali and the properties of alkalis are due to these hydroxide ions(OH−). ... - Thus, conclusively it can be said that all alkalis are bases but all bases are not alkali.

Answer:

This is false

Explanation:

it is actually the opposite, all bases don't dissolve in water, but alkali is a base that does dissolve in water. So, alkalis are bases, but not all bases are alkalis

Pinky, message in one of my answers that doesn't have an comment on pls.. i wish i can tlk to u.. but this new system in brainly.. oof

Answer:

The maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2).

Answer:

The answer would be B.

Explanation:

There are 4 moles of spectator ions that remain in solution.

The equation of the reaction is;

Na2CO3(aq) + Pb(NO3)2(aq) -------> PbCO3(s) + 2NaNO3(aq)

We have to determine the limiting reactant. This is the reactant that yields the least amount of product. Note that the spectator ions are Na^+ and NO3^- that form NaNO3.

For Na2CO3

1 mole of Na2CO3 yields 2 moles of NaNO3

3 moles of Na2CO3 yields  3 × 2/1 = 6 moles of NaNO3

For Pb(NO3)2

1 mole of Pb(NO3)2 yields 2 moles of NaNO3

2 moles of Pb(NO3)2 yields 2 × 2/1 = 4 moles of NaNO3

We can see that Pb(NO3)2 is the limiting reactant.

Since [NaNO3] = [Na^+] = [NO3^-], it follows that there are 4 moles of spectator ions that remain in solution.

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Answer:

what is the question

Explanation:

Answer:

Um what do u want us to check?

Explanation:

Answer:8

842.46 or to the next whole number

Explanation:

just multiply the mass of iron with the volume mL you have.

The mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

The product of density and volume of a substance represents its mass. Mathematically -

M = V x ρ

where -

ρ - density

M - mass

V - volume

Given is iron in liquid form. It occupies a total volume of 111 ml.

The mass of liquid iron can be calculated using -

M = V x ρ

Volume of iron [V] = 111 ml = 111 cm³.

Density of iron [ρ] = 7.847 g/cm³

Therefore, we can write -

M = 7.847 x 111

M = 871.01 grams

Therefore, the mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

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Knowing an object's position requires the (D) reference point

Reference point is the starting point use to locate another place or object. an object's position depends on reference point.

Position describes the distance and direction from reference point for an object. position of an object's is the location to the reference point.

Displacement is the difference between the initial position and the final position.

Speed is defined as the distance an object travels per unit time.

Time is defined as the duration  of an object travels to cover a distance.

so according to all , reference point is needed to determine the position of an object's.

Thus, Knowing an object's position requires the (D) reference point

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Answer:

I think the answer is yellow or White

Explanation:

because it is the visible light that I know

mask me as brainless

thanks

Answer is B are kinds of physical change.

Answer:

true

Explanation:

Answer: Hydrogen-H

Explanation: Hydrogen is a gas, the most abundant element in the universe and the simplest of them all

Answer:

A neutron in the nucleus converts to a proton and a beta particle. The nucleus ejects the beta particle and some gamma radiation. The new atom retains the same mass number, but the number of protons increases to 44.

Explanation:

mark me the Brainliest pls..

Answer:

Alkali metals have 1 valence electron on their outer shell. They are more stable when they have 8 valence electrons, so they want to lose that valence electron. They do this by bonding with other elements. When they lose their 1 valence electron, they have a full octet and are therefore stable.:

Answer:

B. Saliva breaking down molecules in the mouth

Explanation:

I'm pretty sure it's this because saliva contains enzymes and enzymes use chemicals to break down food in your mouth. For example, your mouth has an enzyme called amylase which helps to break down starches.

Answer:

B. Saliva breaking down molecules in the mouth

Explanation:

I'm pretty sure it's this because saliva contains enzymes and enzymes use chemicals to break down food in your mouth. For example, your mouth has an enzyme called amylase which helps to break down starches.Explanation:

Answer:

glucose and amino acids

Explanation: