Chemistry College

BRAINLIEST if answered correctly ​

BRAINLIEST If Answered Correctly

Answers

Answer 1

Answer:

I would choose E

Explanation:

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products

web-

Answer 2
E is the correct answer!!

Related Questions

Water pollution has severely impacted animals and plants in New York's Hudson

Answers

Yeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeet

Given a volume of 47.8 mL of gas at STP, _______________ moles of O2 exist

Answers

At STP, a mole of any gas occupies 22.4 L. So given 48.7 mL—or 0.0487 L—of O2 gas at STP, the number of moles of O2 that exist is 0.00217 moles.

Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M to give 500 mL of solution. A 15.00-mL aliquot was then diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 327 on an arbitrary scale. A standard 100 ppm quinine solution registered 180 when measured under conditions identical to those for the diluted sample. Calculate the mass of quinine in milligrams in the tablet.

Answers

Answer:

605.6mg of quinine

Explanation:

Based on Lambert-Beer's law, the intensity of an optical measurement is directely proportional to its concentration.

Unknown concentration gives a reading of 327

100 ppm gives 180 of intensity

The concentration of the diluted quinine tablet is:

327 * (100ppm / 180) = 181.67 ppm. The final dilution

The concentration of the first diluted solution is:

181.67 ppm * (100.0mL / 15mL) = 1211ppm

ppm could be defined as mass of solute (In this case of quinine) in mg per liter of solution. That is:

1211mg / L

As the tablet was diluted to 500mL = 0.5L, the mass of the quinine is:

0.5L * (1211mg / L) =

605.6mg of quinine

5. What physical property of foam makes it a good choice to
use in life vests?
A. Foam has a relative density less than water.
B. Foam is a good thermal insulator.
C Foam is non-magnetic.
D. Foam is soluble in water.

Answers

A. Foam has a relative density less than water

What is the molar mass of AlCl3

Answers

Answer:

133.34 g/moles

Explanation:

but to make life easy it could be 133.4 g/ moles as well

Help please I’ll mark as brainiliest

Answers

Answer:

         B             B

W      BW          BW        

W       BW          BW

Explanation:

Hope this helps

is pyramidal molecular geometry?

A. N2
B. H2O
C. NH3
D. CCL4

Answers

Answer:

[tex]\color{Blue}\huge\boxed{Question} [/tex]

Is pyramidal molecular geometry?

[tex]\color{Blue}\huge\boxed{Answer} [/tex]

B.H2O
it should be B.H2O!
goodluck please let me know if i’m wrong

Please help with this one

Answers

Answer:

15g

Explanation:

hope this helped

An unknown compound was found to be soluble in concentrated sulfuric acid; however, the 2,4-DNP, chromic acid, and potassium permanganate gave negative results. The only positive result detected was the ferrous hydroxide test. What is the most likely functional group present in such compound

Answers

Explanation:

2,4-DNP is negative: aldehyde and ketone absent

Chromic acid is negative: alcohol absent.

KMnO4 test negative: alkene absent

The only positive result is for Fe(OH)2.

Nitro group-containing compounds react with ferrous hydroxide to give amine and ferric hydroxide red ppt. Hence given compound contains the nitro group (-NO2).


a 55g block of metal has a specific heat of 0.45 J/g°C. What will be the temperature change of this metal if 450 J of heat energy are added

Answers

Answer:

18.18C

Explanation: Write whats below to show your work :D

m=55

C=0.45

Q=450zj

ch.temp=?

Q=mct

450 = (55)(.45)T

450 = 24.75

/24.75 = /24.75 (cancels out)

18.18 is the answer

Hope this helps! did it with my teacher.

Today, there are ____ GMO crops currently produced in the US.

A. 120
B. 10
C. 55
D. 1000

Answers

Answer: I think that is 55

Explanation: I hope I help

The answer is c. Have a good day/night.

How many moles of water are produced from the reaction of 0.224 mol oxygen according to this equation? 2H2 + O2 -> 2H2O

Answers

Answer:

0.448 mols

Explanation:

Use balanced equation:

2H2 + O2 -> 2H2O

For every one mole of oxygen, there are two moles of water

hence the molar ratio 1:2

So if there are 0.224 mols of oxygen

Water = 0.224×2

Which is 0.448 mols of H20

Other Questions
Item 8After Lenin, who ruled the Soviet Union as a ruthless dictator?Kaiser WilhelmJohn McCraeNicholas IIJoseph Stalin How did the Japanese know about western inventions?plz help In 1513 Balboa and his crew reached a what that connected North America and South America louise decided to purchase a new mountain bike when he saw the sporting good store was offering 20% off their bike. what is the total cost of the mountain bike if the originally price at $249 and louise must pay 7.5% sales tax Fill in the blanks! Completa las frases con la forma correcta del imperfecto o del pretrito.6.Yo ________________________(asistir) a la escuela hasta que __________________(tener) diecisiete aos.7.___________________(ser) las ocho cuando Alejandro __________________(llegar)8.Yo ______________________(empezar) un nuevo trabajo ayer. ____________________ (estudiar) por cuatro aos para prepararme. Hace dos aos ___________________________. (graduarse).9.Y vosotros? _________________________(estudiar) por seis aos?11.Mientras yo _____________________(leer) Marta _____________________(apuntar) las cifras.12.Elisa __________________________(lucir - to shine /make an impression) un vestido elegante y ___________________(ser) la chica ms bonita de la clase.13.Yo _________________________(pensar) que no _________________(ir) a llover. Which of the following was true for Serfs living in Medieval times? Select all that applythey provided food in exchange for protectionthey were free peoplethey did not own propertythey were the majority of the people at that timetheir position in society was inherited by birththey lived in the manor of their lord but were able to come and go as they pleased can someone please help me with this? 2. Why is alcohol thermometer not suitable to measure high temperature? 3. Ellis Island stopped processingimmigrants inO 1924.O 1954O 1964O 1984 Carmen surveys a random sample of 35 students from her school. Of these students, 2 are chess club members. If there are 550 students at her school, how many of them are likely to be chess club members? Can somebody please help me ????? What season is the Northern Hemisphere experiencing?O springO winterO autumnO summer Please Help!!!! Due today will give brainliest Which expression shows 3 decreased by the sum of 11 and a number? A. 3-(11+x) B. (11+x)-3 C. 3-11+x D. 3+11x Yall I need help on history. Who ever awnsers first and correctly gets a brainly. If you awnser both I will give you 5 stars. A girl runs 40m due south in 40 seconds an d then 20m due north in 10 secondsCalculate.the average speed, her average velocity .in her change in velocity for the whole journey! How many more brooms must each earn in order to have enough credit to get a month off with pay? IExplain why slavery in the Mexican cession was very important to the north andsouth? Why would the location of resources be a concern?A) Some areas have more access to resources than others.B) Human populations are sometimes concentrated in areas that are lacking resources.C) Areas with fewer resources may need to buy resources from other areas.D) All of the above What would happen to a vascular plant if there were not structures to move the materials throughout the plant?