Chemistry High School

Plz help meeeeeeee !!!!!

Plz Help Meeeeeeee !!!!!

Answers

Answer 1

Answer:

Na2S

Explanation:

last answer with Na2S

Related Questions

2
Is the molecule with the formula Br
an element mixture or compound?
How do you know this?

Answers

Answer:

i do not know

Explanation:

A sample of CO2 has a volume of 6.08 cm3 at 2.0 atm. At what pressure would this sample of gas have a volume of 42.0 cm?
А
28.9 atm
00
2.89 atm
С
0.289 atm
D
289 atm

Answers

C 0.289 why but because of decimals i’m gonna go with that one

Why do we perform an experiment?

Answers

Answer:

Experiment plays many roles in science. One of its important roles is to test theories and to provide the basis for scientific knowledge. It can also call for a new theory, either by showing that an accepted theory is incorrect, or by exhibiting a new phenomenon that is in need of explanation.

Explanation:

Answer:

Explanation:

One of its important roles is to test theories and to provide the basis for scientific knowledge that we need to know. How are we supposed to know the answer to our question if we don't perform the experiment to test our question.

What is the electric configuration for phosphorus?

Answers

1s^2 2s^2 2p^6 3s^2 3p^3
That’s the electron configuration for phosphorus

what is the most important part of an Atom? Why?

Answers

Answer:

I would say proton and electron are the two most important subatomic particles in an atom

Explanation:

The number of protons inside a nucleus must equal to the number of electrons outside of the nucleus. This number determines all the chemical properties of the atom, which governs the behaviors of all matters in our world.

Answer:

I would say proton and electron are the two most important subatomic particles in an atom. The number of protons inside a nucleus must equal to the number of electrons outside of the nucleus. This number determines all the chemical properties of the atom, which governs the behaviors of all matters in our world.

Explanation:

How do you determine the charges on the ions in an ionic compound?

Answers

Answer:

To find the ionic charge of an element you'll need to consult your Periodic Table. On the Periodic Table metals (found on the left of the table) will be positive. Non-metals (found on the right) will be negative.

Explanation:

Can some right a paragraph about photosynthesis pls =))))))))))))))))))))))

Answers

Answer:

Photosynthesis is the process in which plants harness energy from the sun to make their own nutrition. The process converts light energy into chemical energy through cellular respiration.

Explanation:

Just to start you off. I hope it helps! (❛ ᴗ ❛)

Answer:

Photosynthesis is the process which a plant makes it's own food. The plant get energy from the sun and water from the soil. The plant lets the suns energy flow though so it touches all the parts that need it. When it get the water from the soil it goes into the stem and to the leaves. Photosynthesis is important because it benefits the air and us too. We can also help by put carbon dioxide. Photosynthesis is part the life cycle of a plant.

Explanation:

NEED HELP! thank you!
The same element is present before and after a
O chemical change
O physical change
O chemical reaction
O none of these

Answers

Answer:

This is a physical change.

Explanation:

As long as the identity of the substance has not changed, and the element is present before and after, it is a physical change! (Ex: ice melting)

What is the quantity of atoms in KMnO4 ?

Answers

Answer:

Potassium permanganate has a molar mass of 158.04 g/mol. This figure is obtained by adding the individual molar masses of four oxygen atoms, one manganese atom and one potassium atom

Explanation:

Potassium permanganate has a molar mass of 158.04 g/mol.

The term used to describe the Moon phases as the light spreads across the surface of the moon or grows.

Answers

Answer:

Explanation:

New moon

Waxing crescent moon

First quarter moon

Waxing gibbous moon

Full moon

Waning gibbous moon

Last quarter moon

Waning crescent moon

Answer: Waxing

Explanation: Waxing means is getting lighter.

Waning means its getting darker.

Write a balanced symbol equation for the incomplete combustion of hexane (C6H14) to produce soot.

Answers

Answer:

I77

Explanation:

What part of the isotope notation help you determine the number of electrons within an isotope?

Answers

It’s b got it on test

To balance a chemical reaction you can list all the atoms on the right and left, then count, and add coefficients until the reaction is balanced. Look at the reaction below. Choose the picture that shows a balanced chemical reaction for the reaction below.

Answers

Answer:

I think option 3 is correct

The Theory of _________ states that new ocean crust is formed at ocean ridges where plates are diverging.

Answers

Answer- Seafloor spreading
i don’t know lol but i have to answer something

30. The more reactive halogen elements are able to replace the less reactive halogens from their com-
pounds. For example, if chlorine gas is bubbled
through a potassium iodide solution, elemental
iodine is produced.

Cl2(8) + Kl(aq) →12(s) + KCl(aq)

Calculate the mass of iodine produced when 2.55 g
of chlorine gas is bubbled through an excess amount
of potassium iodide solution.

31. Although we usually think of substances as “burn-
ing” only in oxygen gas, the process of rapid oxida-
tion to produce a flame may also take place in other
strongly oxidizing gases. For example, when iron is
heated and placed in pure chlorine gas, the iron
"burns” according to the following (unbalanced)
reaction:

Fe(s) + Cl2(8) ► FeCl3(s)

How many milligrams of iron(III) chloride result
when 15.5 mg of iron is reacted with an excess of
chlorine gas?

please help. this is due tonight. thanks!

Answers

Answer:

n=m/mr

n of cl2=0.0713mole

Form equation

cl2+k------- I2 s+kcl

1mole of cl=I moleof I2

0.0713mole of =x of I2

X mole of I2=0.0713

n=m/mr

0.0173=m/253.9

mass of I2=18.09g


What is the structure of epithelial cells?


Answers

Your answer is C for sure

HELP PLEASE | 15 POINTS Determine the number of valence electrons in each diagram shown below.

Answers

answer:

Cl = 7 valence electrons

Mg = 2 valence electrons

explanation:

in order to determine the valence electrons, just look at the outermost shell or the last shell. whatever number of electrons it has will be the number of valence electron

How many grams of lithium sulfide (Li2S) are in 275 g of a 16 % aqueous solution of Li2S?

Answers

Answer:

600 mAh·g−1

Explanation:

i hope this is good let me know if its wrong

what does appeal mean​

Answers

a act of law to remove

Answer:

as a verb it means make a serious or urgent request, typically to the public.

"police are appealing for information about the incident"

as a noun it means a serious or urgent request, typically one made to the public.

"his mother made an appeal for the return of the ring"

Explanation:

hope it helps

How many particles are in 3.4 moles of HCl?

Answers

Answer:

The volume is 77 L.

Explanation:

where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature in Kelvins.

The current STP temperature is 0∘C or 273.15 K (used for gas laws), and the pressure is 105Pa, which most people write as 100 kPa (both pressures are equal).

the metallic compound reduced to the metal by electrolysis is _____

please girls answer, because I think u r always right. ​

Answers

Answer:

Magnesium oxide

Explanation:

When magnesium reacts with oxygen, the magnesium atoms donate electrons to O2 molecules and thereby reduce the oxygen. Magnesium therefore acts as a reducing agent in this reaction. The O2 molecules, on the other hand, gain electrons from magnesium atoms and thereby oxidize the magnesium.

Lokesh is sawing boards to make a deck. What is the area of the deck?
12 ft
9 ftil
6 ft
8 ft
OA. 198 square feet
O B. 234 square feet
O C. 207 square feet
O D. 171 square feet

Answers

Answer:

Explanation:

171

Newton's 2nd Law of Motion states that the "acceleration" of an object depends on what 2 things? i need help fast plz 10 points

Answers

Answer:

Speed and velocity

Explanation:

"The acceleration of an object depends on its mass and the amount of net force acting on it"
The acceleration is depend directly on the force while inversely on the mass.

How many moles of Mg3(PO4)2 are in 350.00 grams of Mg3(PO4)2?

Answers

Answer:

1.3 moles/ 1.33150727 moles

Explanation:

350g x 1 mol/262.86g = 1.3 moles

The molar mass of Mg3(PO4)2 is 262.855 g/mol

Atomic weight of the parts:

Mg 24.3050   x 3 = 72.92

P 30.973762   x2 = 61.95

O 15.9994   x8 = 127.995

There are 262.855 grams in one mole, so  

350.00 g x (262.855g/1 mole) = 1.33 moles Mg3(PO4)2

IM IN A TEST NEED HELP ASAP
When 2.00 mol of the acid react with sodium carbonate, 1.00 mol of carbon dioxide is formed.Calculate the volume of carbon dioxide formed, in cm 3 , from 8.00 g of the acid at room temperature and pressure.

Answers

good luck on ur test i wish i could help u more but im only in 7th grade :/ and i dont know that yet, so sorry again! :(

Explanation:


6. How many molecules are in 2.7 moles of carbon dioxide

Answers

Answer:

2.7×6.022×10^23

=16.594×10^23 moleclules

Explanation:

number of mol= 2.7

1 mol of any element=6.022×10^23

therefote 2.7 mol =2.7×6.022×10^23

=16.594×10^23

A mole is -6.022 • 10 to the 23 power of something.

So, saying you have a mole of iron atoms is like saying you have 6.022 • 10 to the 23 power iron atoms

There for you have 1.63 • 10 to the 24 power

How do I write a Major Electron Level Notation in the ground state??

Answers

Electron configurations are written using the principal quantum number n, followed by the orbital (s, p, d, or f) with the total number of electrons written as a superscript. Example: 1s2 For writing ground state electron configurations, a few main steps should be followed.

What's the equation used to calculate how far a wave has traveled?

Answers

For calculating the distance that sounds travels, distance = velocity x time. Therefore, the distance between the sensor and the object is one half the distance traveled by the sound wave.

Boreal forests are characterized by _______ trees. A. Creosote b. Eucalyptus c. Coniferous d. Deciduous Please select the best answer from the choices provided A B C

Answers

Answer:

c

Explanation:

coniferous trees, Tianga also called Boreal forest biome (major life zone).

hope it's perfect.

Answer: C is correct.

what is the orbital diagram for manganese?

Answers

[Ar] 3d5 4s2 I hope that helps ❤️

Explanation:

Oxidation States. +2,3,4,6,7

Electrons Per Shell 2 8 15

Electron Configuration [Ar] 4s2 3d5

1s2 2s2 2p6 3s2 3p6 4s2 3d5

Other Questions
can you help me I dont understand6. Solve: 143 = 13y ( HELPP I WILL GIVE BRAINLIEST+ 16 PTS RANDOM ANSWERS WILL BE REPORTED)Read the speech and answer the question.Voluntourism: An Opportunity Too Good to be TrueA Speech to the Student Body of Evergreen High[1] Picture this: It's Spring Break, and you fly off to some country where there's lush rainforests and beautiful, blue coastlines to explore. There's also people in need, so you decide to blend your vacation with volunteering. Volunteering as a tourist, or voluntourism, seems like a great way to explore new regions and help people at the same time. However, this "volunteer plus travel" experience can actually harm local communities. While many teens might view traveling and volunteering abroad as a worthwhile adventure, there are more genuine and effective ways to make a difference.[2] Most would agree that volunteering in general is a worthy use of time. However, what if you found out the children you are "helping" are actually being kept in poor conditions so voluntourists will spend money to come to the local area? Dale Rolfe, a supporter of ethical voluntourism, explains the shocking reality that "Animal sanctuaries and orphanages are often manufactured for the voluntourist...encouraging a cycle of exploiting the very animals and children the volunteers are trying to help."[3] Proponents of the "volunteer plus travel" experience also argue that traveling to new places builds character and is a valuable way to learn about different cultures. With voluntourism, however, participants often pursue experiences that are all about them. For example, they sign up to build a school for a gold star on their resume, but they have no real building skills and take jobs away from local construction workers (Schulten). Or, they arrive to teach English but instead take selfies with the locals. One world traveler and ethical voluntourist believes voluntourism "can perpetuate small minded views of the world by taking insulated, fake, and structured experiences and selling them as unabridged and eye opening" (Carlos). The voluntour experience is a mirage. The voluntourist's eyes are not opened to real life at the destination, and lasting change is not achieved.[4] If you want a genuine experience where you can see a lasting impact, there are better options than voluntourism. You can volunteer in your local community. Give an hour every week to your town's animal rescue. Serve monthly dinners to the homeless. Be a reliable, positive influence on a child who needs a mentor. Studies show that volunteering and forming lasting relationships with those you help has a positive impact on your physical and emotional health. In fact, blood pressure is reduced, memory is improved, and rates of depression are reduced (Michaels).[5] There is another reason to look into alternatives to voluntourism. Did you know the average "voluntour" travel package costs $3,400 (Rolfe)? Could that travel money be better spent? If the world's citizens are your passion, it could go to an international organization. If you care about education, your funds can be used to buy books for students in faraway lands. If you want villagers to have clean water, contribute funds to local efforts to dig wells. If you want to experience a different culture, travel to the country as a guest, and learn from the locals how you can best help them after you've returned home. But do not voluntour.[6] In reality, there are better ways to make a difference. Voluntourism might appear to be an adventure that blends travel and helping others, but it does little except provide a costly, superficial experience that might actually do more harm than good. So, volunteer where you are most needed-at home, where you can stay to see the job through and form genuine, lasting relationships. Choose a beautiful coastline closer to home and send the travel money you saved to an international organization that will put it to good use. Whatever you do, don't turn someone else's hardship into your vacation.Identify the two strategies the speaker uses to develop the point that people who voluntour often have selfish motivations. Examples Metaphor Repetition Stories Statistics ANSWER ASAP The disorder where one is fearful of public spaces and leaving the comfort of ones own home is __________.A.acrophobiaB.coulrophobiaC.claustrophobiaD.agoraphobia Mhanifa please help I need this done ASAP! I will mark brainliest. I dont want people putting random answers! 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