Answer:
Explanation:
From the net ionic equation
Ba2+(aq) + SO42-(aq) ==> BaSO4(s) we see that 1 mole Ba2+ reacts with 1 mole SO42- to -> 1 mol BaSO4
Find moles of Ba2+ used: 0.250 moles/L x 0.0323 L = 0.008075 moles Ba2+
Find moles SO42- present: 0.008075 moles Ba2+ x 1 mol SO42-/1 mol Ba2+ = 0.008075 mol SO42-
Find mass of Na2SO4 present: 0.008075 mol SO42- x 1 mol Na2SO4/1 mol SO42- x 142.04 Na2SO4/mole = 1.14698 g = 1.15 g Na2SO4 (to 3 significant figures)
Answer: Approx 2kg of salt are required.
Explanation: If 4.5 ⋅ L of a 3.0 ⋅ m o l ⋅ L − 1 solution are required, this is a molar quantity of 4.5 ⋅ L × 3.0 ⋅ m o l ⋅ L − 1 = 13.5 ⋅ m o l . Now, we simply multiply this molar quantity by a molar mass to get the mass: 13.5 ⋅ m o l × 142.04 ⋅ g ⋅ m o l − 1 = ? ? ⋅ g
En una muestra de jugo de limón la concentración de H1 es de 3.8x10 a la 4 potencia ¿ cual es su PH considerando que 378= 0.58
Answer:
pH = 3.42
Explanation:
Para calcular el pH necesitamos usar la siguiente expresión:
pH = -log[H⁺]
Por tanto, solo necesitamos reemplazar el valor dado de [H⁺] en la expresión anterior y se determina su pH:
pH = -log(3.8x10⁻⁴)
pH = 3.42Por tanto el pH de la muestra de jugo de limón es 3.42
Please help me one these two questions!! Due Today :/
1.) Write the Chemical Formula for:
Trinitrogen monochloride
2.) Is this Compound Ionic or Covalent?:
Cs3PO4
I’ll mark brainlist to whoever answers it correctly
A student was in the lab testing the conductivity of different solutions. Three of the solutions were NaNO3, Ca(NO3)2, and Al(NO3)3. Which of the solutions should be the best conductor of electricity?
Answer:
Aluminium nitrate
Explanation:
[tex]Al(NO _{3}) _{3}[/tex]
This is because there are many conducting nitrate ions compared to the other electrolytes
Select the correct answer.
A circuit is used in which process?
OA. electricity
OB. magnetism
OC. velocity
OD. gravity
Answer:
electricity
Explanation:
A circuit is used in every electrical and electronics operation.
PLZ HELP!!!!!! IN YOUR OWN WORDS PLZ! :D
Imagine your cell phone rings. Describe how the sound gets transmitted from your phone to your ear, and then, from your ear to your brain. In your response, be sure to mention the type of wave that a sound wave is, the medium the sound is transmitted through before it gets to your ear, and what happens in your ear once the sound reaches it.
Answer:
SOUND WAVE (carried by thin metal inside the phone) ⇒ELECTRICAL ENERGY (over the wire) ⇒SOUND WAVE (that is heard by someone on the side of the phone)
Explanation:
What is a sound wave?A wave that is comprised of compression and refraction, by which sound is propagated in an elastic medium such as air.
How does sound get transmitted from phone to ear?
The sound waves are carried to a thin metal disk inside the phone, known as the diaphragm, and are converted into electrical energy. The electrical energy travels over wires to another phone and is converted from electrical energy to sound waves again which can be heard by the one on the other end of the phone.
How does sound get transmitted from ear to brain and what happens when sound reaches the ear?Sound waves enter the outer ear and travel through a small passageway (ear canal), which leads to the eardrum.The eardrum vibrates from the coming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are known as the malleus, incus, and stapes.The bones present in the middle ear amplify the sound vibrations and send these vibrations to the cochlea (the snail-shaped structure that is filled with fluid present in the inner ear). An elastic separation runs from the beginning to the edge of the cochlea, splitting it into upper and lower parts. This separation is called the basilar membrane as it serves as the base on which key hearing structures sit.Once the vibrations result in the fluid inside the cochlea rippling, a traveling wave appears along the basilar membrane. Hair cells (sensory cells) sitting on top of the basilar membrane ride the wave. Hair cells near the broad end of the cochlea detect higher-pitched sounds. Those closer to the center detect lower-pitched sounds, such as a large dog barking.As the hair cells move up and down, microscopic hair-like projections (known as stereocilia) that perch on the peak of the hair cells crash against an overlying structure and bend down. Bending results in pore-like channels, which are at the tips of the stereocilia, opening up. Then chemicals rush into the cells, producing an electrical signal.The auditory nerve carries this electrical signal to the brain, which in return it into a sound that we recognize and understand.In this way, sound reaches our ears.
learn more about sound waves here:
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need these 2 answered asap pls
Answer:
im not a brain wiz but i think 20
Explanation:
cells, Cell Division)
1. Which of the following statements is NOT part of the cell theory?
a. Cells are the basic unit of structure and function in living things
b. All cells are produced from other cells.
C. Only animals are composed of cells.
d. All living things are composed of cells.
Answer:
c is wrong
Explanation:
Where on the periodic table are you most likely to find elements that do not react with other elements A) group 1 B) group 2 C) group 17 D) group 18
Answer:
d) group 18
Explanation:
Group 18 on the periodic table consists of noble gasses, which do not chemically interact with other elements.
What is the pOH of a solution that has a hydronium ion concentration [H3O+] of 8.26 x 10–5 M?
1.20 x 10 ^-10
4.08
-9.92
9.92
-1.20 x 10 ^-10
-4.08
Answer:
9.92
Explanation:
Since we are given the concetration of H+ we can find the ph by taking the negative log and then subtracting the ph from 14 to give us pOH
-log(8.26e-5) = pH= 4.08
pOH= 14-4.08
pOH= 9.92
Calculate the pOH for a solution with a pH of 12.34. Is the Solution acidic or basic?
Answer:
1.66 basic
Explanation:
How many moles of Co are needed to produce nine moles of CO2
Answer:
guizzes
Explanation:
guizlet
Answer:
2. 8 moles of carbon dioxide can be produced from 12.5 moles of oxygen. 1 mole of octane can be produced from 8 moles of carbon dioxide gas.
Explanation:
hope this helps :)
De quelle atome dérive le néon svp
Answer:
sorry
Explanation:
sorry I don't know language
Please help me. Thank you so much to whoever decides to help me and I love you
Answer:
2,702.7027 I think ...
Students set up an experiment to investigate whether or not a chemical
reaction has occurred when mixing an antacid tablet with water. The results
are listed in the table. Which is not evidence that a chemical reaction has
occurred? *
Answer:
open system
Explanation:
it needs to loose mass not gain mass
Porque el carbón no se disuelve en agua ????
A light ray strikes a plane mirror at an angle of 20 degrees to the normal. What is the angle of the reflected light ray to the normal?
20 degrees
0 degrees
40 degrees
70 degrees
Answer:
20 degrees
Explanation:
Applying the second law of reflection,
Second Law of reflection: The law of refelection states that the incident angle, reflected angle.
Mathematically, it can be expressed as
i = r...................... Equation 1
From the question, we were told that the light strik the plane at an angle of 20 degrees to the normal.
Therefore,
i = 20 degrees.
If i = 20 degrees,
then,
r = 20 degrees.
Which one of the following is not a fossil fuel?
A: Natural gas
B: Coal
C: С Uranium
D: Oil
The answer is C, Uranium.
Natural gas, coal, and oil are all naturally made from fossils. Uranium is an element which can be found on the Periodic Table of Elements.
C. Uranium
... ... ... ...
Write the products and balance the equation:
C4H7OH + O2 → CO2 +H2O
Answer:
C4H7OH + 6O2 => 4CO2 + 4H2O
Explanation:
hope This helps :)
If 500 mL expandable cylinder with a pressure of 500
mmHg was filled until the volume was 1.2 atm. What is the
new volume?
Answer:
0.274 L
Explanation:
Applying Boyle's law,
PV = P'V'................. Equation 1
Where P = Initial pressure, V = Initial volume, P' = Final pressure, V' = Final volume.
make V' the subject of the equation,
V' = PV/P'............. Equation 2
From the question,
Given: P = 500 mm Hg, V = 500 mL = 0.5 L, P' = 1.2 atm = 912 mm Hg
Substitute these values into equation 2
V' = (0.5×500)/912
V' = 0.274 L
Hence the new volume is 0.274 L
How much heat, in kilojoules, is needed to raise the temperature of 236 g of silver from 8.5oC to 34.9 °C? (cAg = 0.24 J/g°C)
Answer:
1.49kJ
Explanation:
Using the formula as follows;
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass (g)
c = specific heat of silver (J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
mass of Silver (Ag) = 236g
c of Ag = 0.24 J/g°C
initial temperature (T1) = 8.5°C
final temperature (T2) = 34.9°C
∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C
Using Q = m × c × ∆T
Q = 236 × 0.24 × 26.4
Q = 1,495.3 Joules
Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953
Q = 1.49kJ
How many moles of NaOH
would you have in a
sample that weighed 10g?
Answer: There are 0.25 moles of NaOH in a sample that weighed 10g.
Explanation:
Given: Mass of NaOH = 10 g
Molar mass of NaOH is 40 g/mol.
Number of moles is the mass of substance divided by its molar mass.
Therefore, moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molarmass}\\= \frac{10g}{40 g/mol}\\= 0.25 mol[/tex]
Thus, we can conclude that there are 0.25 moles of NaOH in a sample that weighed 10g.
Which statement(s) is/are TRUE about the pressure of a gas?
SELECT ALL THAT APPLY
a Pressure increases when volume increases
and temperature decreases.
b Pressure increases when temperature
increases under constant volume.
С Pressure increases when volume is
decreased under constant temperature.
D Pressure decreases when the amount of gas
is increased under constant volume and
temperature.
Answer:
B and C are correct
Explanation:
a) false, pressure increases when volume decreases and temperature increases
b) true, pressure and temperature are directly proportional
c) true, pressure and volume are inversely proportional
d) false, pressure and amount of gas are directly proportional
all of these relations can be summarized by the ideal gas equation:
pV = nRT
p: pressure
V: volume
n: amount of substance
R: gas constant
T: absolute temperature
2 moles of substance A contains 12.04 × 1023 atoms.
I have 12.04 × 1023 atoms of substance B.
How many moles of substance B do I have?
Answer:
2 moles of Substance B
Explanation:
Because 1 mole of any substance contains 6.02× 10²³ particles either atoms, molecules, ions or even electron(Avogardo Constant)
Therefore 12.04 × 10²³/ 6.02× 10²³ = 2 mole of Substance B
What is important in order for a radioisotope to provide accurate dating
results?
O A. The half-life should be similar to the age of the object.
B. The radioisotope cannot be part of a decay chain.
O C. The isotope must undergo transmutation.
O D. The item being dated must be very old.
The most important factor to be considered in order for a radioisotope to provide accurate dating simply is:
The half-life should be similar to the age of the object.
The correct answer choice is option a.
Why half-life should be similar to the age of the object in determining accurate dating of a radioisotope.Half-life of radioisotope helps in determining dating accurately simply because it helps to predict the amount of radioactive substance remaining after a given period of time.
In conclusion, it can be perfectly deduced from the explanation given above that the half-life of a radioisotope usually, frequently and most of the time helps to determine the rate at which these substances decay.
Read more on radioisotope:
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Beryllium hydrogen carbonate is more than 3% hydrogen by mass.
True
False
Calculate the pOH for a solutions with a pH of 12.34. Is the solution acidic or basic?
Answer:
1.66 basic
Explanation:
How many nitrogen atoms are in 4AgNO3
Answer:
Silver/AG= 4
Nitrogen/N=4
Oxygen/O=12
Explanation:
Which of these has a bond that takes the most energy to break?
a) Brz
b) N,
c) 02
d) HCI
Answer:
Hello! Your answer would be, D) HCI
Explanation:
Hope I helped! Ask me anything if you have any questions. Brainiest plz!♥ Hope you make a 100%. Have a nice morning! -Amelia♥
what will litmus paper turn when it reacts with sodium nitrate?
what is bank?Effect of drug abuse.
- Long term effects
Chronic drug use can alter a person’s brain structure and function, resulting in long-term psychological effects, such as: depression, anxiety, panic disorders, increased aggression, paranoia, hallucinations.
- Cardiovascular disease
Stimulants, such as cocaine and methamphetamines, can damage the heart and blood vessels. The long-term use of these drugs can lead to coronary artery disease, arrhythmia, and heart attack.
- Respiratory problems
Drugs that people smoke or inhale can damage the respiratory system and lead to chronic respiratory infections and diseases. Opioids slow a person’s breathing by binding to specific receptors in the central nervous system that regulate respiration. By depressing a person’s respiration, these drugs can lead to slow breathing or heavy snoring.
- Kidney damage
The kidneys filter excess minerals and waste products from the blood. Heroin, ketamine, and synthetic cannabinoids can cause kidney damage or kidney failure.
- Liver disease
Chronic drug and alcohol use can damage the liver cells, leading to inflammation, scarring, and even liver failure.
- Overdose
Taking too much of a drug or taking multiple drugs together can result in an overdose. According to the Centers for Disease Control and Prevention (CDC), drug overdose caused 67,367 deathsTrusted Source in the United States in 2018. Opioids contributed to nearly 70% of these deaths.
How to get help:
Finding the right treatment program can be a daunting task. Here are a few things to think about when seeking treatment for drug abuse, misuse, or addiction:
consider whether inpatient or outpatient services would be the best fit
find local treatment centers using this resource from the Substance Abuse and Mental Health Services Administration
note that state-run treatment centers and programs can be free of charge
look for programs that use evidence-based treatment strategies