helppppppppppppppppppppppppppppp

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.13 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.13}{6.02} \\ = 0.519933[/tex]

We have the final answer as

Hope this helps you

Answer:

c

Explanation:

oxygen is lost electrons are added in oxidation state is decreased

Answer:

the correct answer is C

hope this helps <3

Answer:

a) 2Ba + O2 → 2BaO

b) 2HCl + Mg → MgCl2 + H2

c) 2HCl + CuO → CuCl2 + H2O

d) Fe + O2 → Fe2O3

Explanation:

Okay so for

a), you must add 2 at the front of Ba and BaO bcuz you're gonna need your equation balanced.

like as you can see, O has 2 so yeahh, you've got to balance it nicely.

b) you must add 2 in front of HCl bcuz the Cl and H after the reaction happened has 2 in them, were talking about balancing so XD

c) and yes again, you're gonna have to add 2 in front of HCl bcuz of the same reason as b).

d) D is definitely a special case bcuz, Fe3+ with O2, so well if you do the cross multiplication technique you'll automatically get Fe2O3. Yas that's it.

English is not my first language so it's hella tuff to explain it to you from in much more detailed perspective T-T Sorry (´∩｡• ᵕ •｡∩`)

If the number of neutrons in the nucleus of the atom is 41, and the atomic number is 40, the mass number of that atom will be 81

Mass number is the sum of the number of protons which is the atomic number and neutrons of an atom.

It is represented using the letter ‘A.’

Mass number = atomic number + neutrons

We have the atomic number as 40 and the number of neutrons as 41

The mass number = 40 + 41 = 81

Therefore, the mass number of the atom will be 81

Learn more about mass number here:

https://brainly.com/question/1805828

Answer:

welp to bad got nothing for you ezcecect good luck bye btw its always the one you think its not

Explanation:

dugg

Answer:

D

Explanation:

It means entry by force.

Answer:

A. 8

Explanation:

For this to be a neutral atom there has to be the same amount of protons and neutrons.

brainliest please. . .

Answer:

Filtration (The process of separating liquids and solids)

Explanation:

Filtration works best when the solute isn't dissolved in the solvent. Basically like how you can filter dirt or sand from water. The opposite of this would be if water and sugar where mixed together you cannot unmix this duo with filtration but with the example given you can use the process of filtration to rid the gasoline of sand.

Answer:

If two atoms get close together then the electrons of each atom will get attracted to the other one and bc one atom lose electrons gets a positive charge and the one with more electrones will get a negetive charge

Explanation:

brailiest pls pls pls

Answer:

H2O is the name of this molecule and it is water

Answer:

FeO

Explanation:

Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron(III) oxide (ferric oxide).

Answer:

what question?

Explanation:

The reason for adding a limited amount and then an excess amount is that initially a metal hydroxide may form which becomes soluble when more base is added and the metal complex forms.

In qualitative analysis is a common to add the base in drops and then in excess. When added in drops, the metal hydroxide is formed. This metal hydroxide is often insoluble.

After this metal hydroxide is formed, the base could be added in excess such that the metal hydroxide dissolves in the excess base by forming a complex.

For instance;

CuCl2(aq) + 2NaOH(aq)  -------> Cu(OH)2(s) + 2NaCl(aq)

Cu(OH)2(s) + 2OH^-(aq) -------> [Cu(OH)4]^2+(aq)

Learn more: https://brainly.com/question/1527403

Answer:

c

Explanation:

the gas is further apart and the liquid is closer together

Answer:

4.002602 u

Explanation

Answer:

4.002602 u

Explanation:

Answer:

Even though i cannot see the image, In chemistry, a mixture is a material made up of two or more different chemical substance/substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Explanation:

Answer:

C!

Explanation:

when water is boiling the water particles will give each other more space and will then be turned into a gas :)

Answer:

from,

moles,n = number of particles, N

Avogadro constant

N = 8.27 * 6.022×10^23

N = 4.98 × 10^ 24particles.

In 8.27 moles of SiH, there are

4.98 × 10^24particles.

Considering the definition of empirical and molecular formula, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.

The empirical formula is the simplest expression to represent a chemical compound and indicates the elements that are present and the minimum proportion in whole numbers that there are between their atoms. This formula is also known as the "minimum formula".

On the other side, the molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. But unlike the chemical formula, it shows the actual number of atoms that make up a molecule.

In this case, you can observe that if you divide the amount of each element by 2 in compound C₄H₁₀, you get C₂H₅, which is the empirical formula of the compound.

Finally, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.

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Answer:

durage

Explanation:

durage just doesn't make sense compared to the other 3

Answer:

Origin of the substance

Explanation:

Origin of a substance doesnt affect toxicity but all other options do

Answer:

6.60

Explanation:

Answer:

25 + 273= 298k.

Explanation:

I guess it's correct answer

The equivalent Kelvin temperature is 298 K.

Temperature is defined as a measurement of an object's or substance's warmth or coolness in relation to a standard value.

It can also defined as the feature of matter that represents the amount of energy of motion of its constituent components.

Temperature scale is defined as a method of indicating or measuring temperature with respect to a beginning point (0 or zero) and a unit of measurement.

Temperature scale is also defined as a way of calibrating the physical quantity temperature in metrology.

Usually there is three types of temperature scale is used.

Thus, the equivalent Kelvin temperature is 298 K.

To learn more about temperature, refer to the link below:

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Answer:837.9

Explanation:add those 2 numbers

Answer:

Francium bc it has the largest atomic radius

Francium has the greatest atomic radius. Despite being a highly radioactive metal with a short half-life, francium has little environmental impact.

To learn more about francium refer to:

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Answer:

Butanoic acid and 2-propanol reacts to form isopropyl butyrate.

Explanation:

brainliest plz

Answer:

7.50 and 50L

35atm

6.2atm

Answer:

When the energy is passed on from one trophic level to another, only 10 percent of the energy is passed on to the next trophic level.

Explanation:

Answer:

i want to help but  i   d   k. the answer :( sorry i couldnt help

Explanation: