help it is due in 15 min and i’m so confused

Answer:

if you are working with a substances that produce or generate toxic or harmful fumes, vapours, gases, dust or chemical aerosols

it should be carried out in a fume cupboard to eliminate or reduce the risk of exposure to an acceptable and safe level.

Answer:

a CUT stands for Circuit Under Test.

Explanation:

Answer:

Emission spectra may be used in studying stars in order to determine what atoms makeup the individual star produces, due to the fact that each atom’s emission spectra biunique, one can observe the spectra emitted by the star and identify the atoms that are released by the light the star produces.

The emission spectrum can tell the elements present in the source of light. Therefore, this method can be used to get information about the element present in the stars.

Electromagnetic radiations interact with atoms or molecules of matter, the electrons absorb energy and jump to a higher energy state of atoms by losing their stability.

They need to move from the higher energy state to the lower energy level to regain their stability. These atoms or molecules emit radiations in several regions of the electromagnetic spectrum. The spectrum of radiation emitted by electrons in the excited state is called the emission spectrum.

The emission spectrum of a chemical element is the spectrum of frequencies of electromagnetic radiation emitted when an atom transitions from a high-energy state to a lower-energy state. The emitted energy is unique for every element and is the characteristic of the element.

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Answer:

a because it comes 20 to 100c

Answer:

I think its D

Explanation:

It doesn't go straight up

Answer:

You can put what they are made out of so show how different they are

Answer:

for what school? It's different for all sadly :(

Explanation:

Answer:

Hydrates! :D

Explanation:

Explanation: Honestly, I have no idea and I've never learned this, but I think it's because of air resistance and currents? Going downwind would mean the plane's rate would be the speed of the wind + the speed of the plane itself. Going upwind, the plane's rate would be the speed of the plane - the speed of the wind. Thus, going one way (e. g. California to New York) could take less time than going the other way.

Answer:

A

Explanation:

Cs has a higher rate of reaction because it's easier to remove an electron from it, thereby leading to faster reactivity

Answer:

It's A but can i have brainliest pls i kinda need it

Explanation:

Answer:

its c

Explanation:

Answer:

b ) NH₄⁺ is a stronger acid than H₂O ( l )

Explanation:

NH₄⁺ + OH⁻ = NH₃ + H₂O .

NH₄⁺ is a conjugate acid of NH₃

OH⁻ is a conjugate base of H₂O .

NH₄⁺ is capable of giving H⁺ to OH⁻ to produce H₂O so it is stronger acid than H₂O .

Had H₂O been stronger , it would have given H⁺ to NH₃ to produce NH₄⁺ but it does not happen .

So NH₄⁺ is a stronger acid than H₂O ( l )  .

Answer: carbon

Explanation:

Answer: hydrogen

Explanation: Hydrogen is usually considered an energy carrier, like electricity, as it must be produced from a primary energy source such as solar energy, biomass, electricity (e.g. in the form of solar PV or via wind turbines), or hydrocarbons such as natural gas or coal. On the other hand, magnesium, carbon, and iodine are not often used as conductors of electricity because they either have a covalent bond that does not generate electricity or because they contain particles or compounds that  can’t be installed inside electric installations.

Answer:

YES

Explanation:

the main reason why bonds form is because the elements wants to be more stable so in a covalent bond the electrons are shared between two elements so they can fulfill or at least "feel" like they have fulfilled there outer shell.

Answer:

B. Argon has similar properties to neon.

Explanation:

hope it helps u.

The statement of element has properties similar to neon is "argon."

A substance that cannot be split into smaller components using normal chemical processes. Elements are chemical compounds that correspond to a single spot on the current periodic table. Elements are made up of only one type of atom.

Argon, like neon, is classified as a noble gas. That is, argon is a member of the noble gas family of chemicals.

Both neon and argon are positioned in the group 8, which means they have eight electrons in their outermost electron shell, making them noble and inert gases. They are very nonreactive since they already have a complete and stable octet structure and don't need to connect to other elements.

Hence the correct option is B.

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Answer: The correct answer would be C.

Explanation: The order of classifications are kingdom, phylum, class, order, family, genus, and species. :)

Answer B

Explanation:Which of the following phrases helps you to correctly remember the order of classifition levels?

the answer is B

Answer: potassium chloride

Explanation:

conducting goodnluck

Answer:

C. Conduction

Explanation:

direct contact of particles will always be conduction.

Answer:

802.2 K

Explanation:

To solve this problem we can use the formula:

Where Tb is the boiling point (in K).

We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:

Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹

So the boiling point of the compound is 802.2 K (or 529 °C)

The boiling point of the compound whose ΔHvap is 47.45 KJ is 802.2 K.

The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.

By the formula of colligative property

[tex]Tb = \dfrac{\Delta Hvap}{\Delta Svap }[/tex]

Where Tb is the boiling point (in K).

ΔHvap is 47.45 kJ·mol⁻¹

ΔSvap is  J·mol−1·K⁻¹

Putting the values

[tex]Tb = \dfrac{47.45}{59.15 } =802.2 K.[/tex]

Thus, the boiling point is 802.2 K or 529° C.

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Answer:

219.95 °C

Explanation:

Given data:

Volume of gas = 9.71 L

Initial pressure = 209 torr (209/760 = 0.275 atm)

Initial temperature = 10.1 °C (10.1 +273 = 283.1 K)

Final temperature = ?

Final pressure = 364 torr (364/760 =0.479 atm)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

0.275 atm / 283.1 K = 0.479 atm/T₂

T₂ = 0.479 atm × 283.1 K/ 0.275 atm

T₂ = 135.6 atm. K /0.275 atm

T₂ = 493.1 K

Kelvin to °C:

493.1 K - 273.15 = 219.95 °C

Answer:

A) energy stored by atoms

Explanation:

Chemical potential energy is the energy stored by atoms. This energy form can be converted to other forms of energy.

Answer:

24.6g of NaCl

Explanation:

Expression of the reaction:

            2NaCl →  2Na  +  Cl₂

Given parameters:

Mass of Cl₂  = 15g

Unknown:

Mass of NaCl  = ?

Solution:

To solve this problem, we have to use mole relationships.

 Find the number of moles of the mass of the given specie;

    Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

     Molar mass of Cl₂  = 2(35.5) = 71g/mol

   Number of moles  = [tex]\frac{15}{71}[/tex]   = 0.21mole

Now;

 From the balanced reaction equation;

        1 mole of Cl₂ is produced from 2 moles of NaCl;

      0.21 mole of Cl₂ will be produced from 0.21 x 2 = 0.42mole of NaCl

So,

  Mass of NaCl = number of moles x molar mass

    Molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

 Mass of NaCl  = 0.42 x 58.5 = 24.6g of NaCl

Answer:

elimination:it is the act of discharging or excreting waste product from body is elimination.

substitution:the act/action of replacing someone or something with another person or thing.

Answer: D.

Explanation: I got it right and the dude above me is spreading fake news

Answer: the correct answer is C velocity.

Explanation: I just got the answer wrong on the exam.

Answer:The Anwser is C; velocity

Explanation: