2. what is the factor in an experiment that a scientist wants to observe, which may change in response to
the manipulated variable; also known as a dependent variable
Given that ammonia (NH3) acts as a weak base in water with a Kb of 1.8 x 10-5 at 298.0 K, calculate the pH at 298.0 K of a solution prepared by mixing 100.0 mL of a 0.050 M aqueous solution of ammonia with 20.0 mL of a 1.00 M aqueous solution of nitric acid. The final volume of the solution is 120.0 mL.
Answer:
pH = 0.903.
Explanation:
Hello there!
In this case, according to the given information about the problem, we can notice there is a reaction between nitric acid and ammonia, whereas just the H ions from the former are relevant:
[tex]NH_3(aq)+H^+(aq)\rightleftharpoons NH_4^+(aq)[/tex]
Thus, we first calculate the consumed moles of ammonia, it order to evaluate the moles after the reaction:
[tex]n_{H^+}=0.020L*1.00mol/L=0.020mol\\\\n_{NH_3}=0.100L*0.050mol=0.005mol[/tex]
It means there is a leftover of moles of hydrogen ions of 0.015mol; then, we calculate the molarity of the resulting solution as follows:
[tex][H^+]=\frac{0.015mol}{0.120L}=0.125M[/tex]
Finally, we use the formula for the calculation of the pH to obtain:
[tex]pH=-log(0.125)\\\\pH=0.903[/tex]
Which means this solution is highly acidic.
Regards!
PLS HURRY TY top says "Part Two: Look at the molecules shown below. Count the number of atoms of each element and write the molecule’s formula. (You may not get the exact order of the elements in the formula, but you must have the number of atoms of each element correct.) An example has been provided. Additionally, in the boxes with an asterisk (*), write the name of the compound (from front). "
Answer: capsaicin C18 H27 NO3
Explanation: I just know the last one sorry G
Where must the moon be in its orbit for the full moon phase to be visible?
A
exactly crossing Earth's orbit of the sun
B
on the side of Earth opposite the sun
C
between Earth and the sun
D
directly above one of Earth's poles
Answer:
A.EXACTLY CROSSING EARTH'S ORBIT OF THE SUNThe moon must be exactly crossing Earth's orbit of the sun for the full moon phase to be visible.
What is Full moon?This is a situation where the Sun and the Moon are aligned on opposite sides of Earth with a corresponding illumination from the Sun.
It also occurs when the moon crosses the Earth's orbit of the sun and is denoted as option A.
Read more about Full moon here https://brainly.com/question/649027
#SPJ2
which element have the formula C6H12O6?
Answer: Glucose is a simple sugar with six carbon atoms and one aldehyde group.
Explanation: hope this helps you
Answer:
the answer of this is glucose
The tetrahedral arrangement of bonds formed by carbon and its relevance In the interaction of biomolecules
Answer:
Due to the presence of 4 valence electrons.
Explanation:
The tetrahedral arrangement of bonds formed by carbon and its relevance In the interaction of biomolecules occurs because the carbon atom has four electrons in their outermost shell and the four hydrogens has one electron each which result is a total of eight electrons distributed in four bonding orbitals making the structure of tetrahedral and the bond angles between these carbon atoms is approximately 109.5 degree.
How many days does it take the moon to orbit the Earth once.
Answer:
27.3 days
Explanation:
I really have no explanation lol.
Answer:
Hope thia helps
Explanation:
it takes 27.3 days!!!
all metals are minerals
a. true
b. false
Answer:
B. False is the rite answer
Define trace gas in simple
NEED ASAP!
Describe how scientific discoveries have changed our culture, national and international legislation.
Answer:
discoveries that can change little aspects of our daily lives or finding cures for diseases that have hounded humanity, scientists have been hard at work trying to push us toward a brighter future.
Explanation:
thats what i got from my research :D
What can you say about the forces between the particles of these gases)
Answer:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.
Explanation:hopes this helps:)
U SEE WHAT IT SAYS~~~~~~~~
UwUwUwUwUwUwUwUwUwUwUwUwUwuWuWUWUWUWU
Please help me!! And please no links!!!!
Write a clear scientific explanation of how and why the water ended up on the mirror and not in the tub. Be sure to include scientific vocabulary (including any phase changes that occurred and the role of kinetic energy).
Vocabulary words-
Condensation
Gas
Heat
Kinetic energy
Liquid
Steam
Vaporization
Water vapor
Answer:
The water was hot it turned into steam then turned to water vapor and the got attached to the glass and as the gas got attached the glass and it built up then became water again. As the vaporization was happening the gas was moving hence the energy building up.
Explanation:
Define An Atom.
Ty!!!
=> the smallest particle of a chemical element that can exist.
-------☆ﾟ.･｡ﾟᵴɒƙυᴚᴀ_ƨȶäᴎ❀
PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Francis Bacon. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Francis Bacon I am a English philosopher and statesman. i was born on January 22, 1561, at York House off the Strand, London. Today, Bacon is still widely regarded as a major figure in scientific methodology and natural philosophy during the English Renaissance. Having advocated an organized system of obtaining knowledge with a humanitarian goal in mind, he is largely credited with ushering in the new early modern era of human understanding.
Explanation:
Which describes the greatest difference between gases and solids?
A. Solids feel softer than gases.
B. Gases are darker colors than solids.
c. Solids have stronger odors than gases.
D. Gases usually weigh less than solids.
Answer:
D)Gases usually weigh less than solids.
Answer:
D) Gases usually weigh less than solids
Explanation:
Gases don't have weight and solids do which automatically makes gases lighter because they don't have a mass like a solid.
no links pls it’s very unhelpful
answer : i don’t knowww :)
Right spelling:
Answer: I don’t know. :)
Measurements of half-life make radioactive isotopes useful for
Balancee las ecuaciones químicas por el método de tanteo e identifique que tipo de reacción es: 1.1.- Cloruro férrico acuoso reacciona con carbonato de sodio sólido para formar carbonato férrico sólido y cloruro de sodio acuoso.
Respuesta:
2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)
Explicación:
Consideremos la ecuación no balanceada que ocurre cuando cloruro férrico acuoso reacciona con carbonato de sodio sólido para formar carbonato férrico sólido y cloruro de sodio acuoso. Esta es una reacción de doble desplazamiento.
FeCl₃(aq) + Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)
Vamos a usar el método de tanteo. Empezaremos balanceando los átomos de C, multiplicando Na₂CO₃ por 3.
FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)
Luego, balancearemos los átomos de Fe, multiplicando FeCl₃ por 2.
2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)
Finalmente, obtendremos la ecuación balanceada, multiplicando NaCl por 6.
2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)
Calculate the volume that 12.5 g of carbon dioxide gas will occupy at a temperature of 45 degrees Celsius and a pressure of 1.20 atm
Answer:
[tex]V=6.2L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to realize that we need to use the ideal gas equation in order to calculate the volume of CO2 but firstly calculating the moles:
[tex]n=\frac{12.5g}{44.01g/mol}=0.284mol[/tex]
Then, we proceed with the ideal gas equation to solve for volume:
[tex]PV=nRT=\\\\V=\frac{nRT}{P}\\\\V=\frac{0.284mol*0.08206\frac{atm*L}{mol*K}*(45+273.15)K}{1.20atm}\\\\V=6.2L[/tex]
Regards!
Why do clouds appear and disappear?
Answer: Clouds are composed of liquid suspended water droplets in about a 100% RH environment. The three primary ways that clouds dissipate is by (1) the temperature increasing, (2) the cloud mixing with drier air, or (3) the air sinking within the cloud. Many things can increase the temperature of the cloud, like the sun, or warm air radiating off of the ground. That's why low fog and clouds tend to disappear as it warms up during the day. ... The air within the cloud descends - When the air descends, it warms.
Explanation:
I don't understand with the question number 4, does anybody understand how to do it?
Answer:
iodine = I
sodium= Na
oxygen= O2
aluminum = AI
nitrogen=N
sulfur= S
bromine =Br
magnesium =Mg
If 25.5g of sodium thiosulphate was dissolved in 40g of distilled water at 25°C,
I). Calculate the solubility of the solute in mol/dm^3
II). Calculate the solubility in g/dm^3
Answer:
Formula: Na2S2O3
we get solubility.
Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g .
Solution given:
mass of sodium thiosulphate [m1]=25.5g
mass of water [m2]=40g
at temperature [t]=25°C
we have
solubility in g/dm^3 :[tex] \frac{solute in gram}{solvent in gram} *100[/tex]
=[tex] \frac{25.5}{40}*100 [/tex]=63.75g /litre=63.75g/dm³solubility in g/dm^3 :63.75g/dm³
now
solubility of the solute in mol/dm^3=:63.75g/dm³/178=0.4 mol/dm³
Define Malleability.
Ty!!
Answer:
Malleability is a capability of making shaped or extended by hammering.
For example:
making a a ring of gold by hammering and heating gold.
6. When you're fighting over a toy with your brother you might
exclaim this ...?
Hey, this is my toy so I get to use it.
Or, GIVE IT TO ME YOU LITTLE SH*T!
Either one does the trick but i recomemmnd the second option
What is the molarity of 20.0 grams of NaOH dissolved in 1.50 L of solution?
(NaOH Molar Mass! 39.997 g/mol)
Question is in picture! Due at 3:45!!!
which method is suitable for collection a a
carbon dioxide.Explain
Answer:
Carbon dioxide can be collected over water. Carbon dioxide is slightly soluble in water and denser than air, so another way to collect it is in a dry, upright gas jar.
Explanation:
teaching self-regulation begins with helping a child
Answer:
hey jazmin! I have been on your friends list for a while on brainly, I thought I'd say hi.
what is the use of connective tissue
Answer:
Explanation:
Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity.
Answer:
Connective tissues can have various levels of vascularity.
Explanation: