Answer:
3.97mL of 1.00M HCl must be added
Explanation:
The buffer of ammonia and ammonium ion follows the equation:
pH = pKa + log [NH₃] / [NH₄⁺] (1)
Where pH is the pH we want to obtain: 10.00
pKa is the pKa of the buffer: 9.25
[NH₃] could be taken as moles of ammonia
And NH₄⁺ moles of ammonium ion
When NH₃ reacts with HCl:
NH₃ + HCl → NH₄⁺ + Cl⁻
NH₄⁺ is produced. That means moles of ammonia are Initial moles of ammonia - Moles of HCl added
Moles of HCl added = Moles of ammonium ion
The total moles of the buffer are:
0.100L * (0.263mol / L) = 0.0263moles = [NH₄⁺] + [NH₃] (2)
Rewriting (1):
10.00 = 9.25 + log [NH₃] / [NH₄⁺]
0.75 = log [NH₃] / [NH₄⁺]
Replacing (2) in (1):
0.75 = log 0.0263 - [NH₄⁺] / [NH₄⁺]
5.6234 = 0.0263 - [NH₄⁺] / [NH₄⁺]
5.6234[NH₄⁺] = 0.0263 - [NH₄⁺]
6.6234[NH₄⁺] = 0.0263
[NH₄⁺] = 0.00397 moles = Moles HCl
To obtain these moles we must add:
0.00397 moles HCl * (1L / mol) = 0.00397L =
3.97mL of 1.00M HCl must be added
What is the boiling point of water?
A. 0°C
B. 50°C
C. 70°C
D. 100°C
Answer:
D) 100*C
Explanation:
Answer:
A. 0°C
Explanation:
El agua se evapora a los 0 grados
1. Which word has the same phoneme as grew, rude, and truth?
A. thumb
B. sure
C. look
D. scoot
Answer:
B-Sorry if this isn't right :/ Good luck.
Explanation:
Answer:
D. Scoot
Explanation:
Grew, Rude and truth all have the sound /OO/ scoot follows that pattern.
The purpose of mitosis is to produce
A. Sex cells
B. Body cells
C. DNA
Which of these is a biotic factor of an ecosystem?
A) Crystals of salt
B) Rays of sunlight
C) Grains of Sand
D) Strands of seaweed
Why is red tide dangerous to ocean animals?
Answer:
Karenia brevis produces toxins called brevetoxins that affect a variety of marine wildlife. Aquatic organisms can be exposed to brevetoxins in several ways: coming into contact with K. brevis cells or toxins in the water, ingesting cells, inhaling toxins and consuming toxic prey.
Explanation:
which of the following is and example of a chemical property?
Write the formula and determine the percent by mass of the salt in barium hydroxide octahydrate *
(show work)
Answer:
315.51g/mol
Explanation:
137(33 + (16.00 + 1.01) 2 + 8 [1.01 (2) + 16.00] = 315.51g/mol
An iron loses electrons. State the type of charge it will end up with
write in your own words
Answer:
Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic
Is it okay if you help me? I'm kind of in a tight spot here. Tysmmmmmmmmmmmmm o(❁´◡`❁)o!!
Answer:
C. Remains constant
Explanation:
Hope this helps (:
A gas has a volume of 500cm3 when a pressure of 100,00N is exacted on it what will be it's volume if the pressure is changed to 150mm mecury at same temperature
Answer:
See explanation below
Explanation:
At first sight, it seems that the innitial pressure of 100,00 N would be 100,00 N/m² because pressure does not have units of newton alone. If this is true, then the calculations are the following (If it's not, but it's actually mm Hg, then skip the part of the conversion, and just do the procedure of solving for the volume).
The innitial pressure is 100 N/m² or simply 100 Pa. As the second pressure is in mm Hg, let's convert the Pascal units to mm Hg:
1 Pa -----> 0.007501 mm Hg
100 ---------> X
X = 100 * 0.007501 / 1 = 0.7501 mmHg
Now that we have the innitial pressure in mm Hg, and the temperature remains constant, we use the Boyle's law to solve for this:
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
Using this expression, let's solve for V₂:
V₂ = 0.7501 *¨500 / 150
V₂ = 2.5 cm³
Now, it's the innitial pressure is 100 mm Hg then the volume:
V₂ = 100 * 500 / 150
V₂ = 333.33 cm³
Check the units of the innitial pressure, one of these results should be the correct answer. If it's not, then please post again the question with the correct units.
Hope this helps
The highest pressure ever produced in a laboratory setting was about 2.0 x 10 6 atm. If we have a
1.0 x 10 -5 liter sample of a gas at that pressure, then release the pressure until it is equal to 0.275 atm,
what would the new volume of that gas be?
Answer:
Volume = 72.7272
Explanation:
if only pressure and volume change, then we can do some simple math to find the answer.
2 x 10 ^ 6 times 1 x 10 ^-5 = 20
pressure and volume must equal 20
20 = 0.275 x volume
20 / 0.275 = new volume
I don't remember significant digits but your volume is 72.72727272 just repeated
If we have a 1.0 x 10 -5 liter sample of a gas at that pressure, then release the pressure until it is equal to 0.275 atm, the new volume will be 72.7272
What is Volume?Volume is the space occupied by a three-dimensional object.
By the Boyle's law
[tex]\rm P_1V_2= P_1V_2[/tex]
P1 (initial pressure) = [tex]2.0 \times10^6 atm[/tex]
V1 (initial volume) = [tex]1.0 \times10^-5 L[/tex]
P2 (final pressure) = 0.275 atm
V2 (final volume) = ? (in L)
Putting the values in the equation
[tex]\rm 2.0 \times10^6 atm \times 1.0 \times10^-5 L = 0.275 atm \times V_2\\\\V_2 = \dfrac{20}{0.275} = 72.72 L[/tex]
Thus, the volume is 72.72 L.
Learn more about Boyle's law
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Name the acid and the base from which the salt calcium sulphate is formed. also write the
balanced chemical equation for the chemical reaction
Answer:
Calcium Carbonate base and Sulphuric acid.
CaCO3 and H2SO4
Answer:
Skeletal equation : Ca(OH)2 + H2SO4 ----> CaSO4 + H2O
Balanced equation : Ca(OH)2 + H2SO4 ---> CaSO4 + 2H2O
Hope it helps
does liquid evaporate with adding heat or losing it
HELP I HAVE 14 MINUTES!!
Which of the following combinations go together to create true statement about subatomic particles?
a - proton
b - neutron
c - electron
d - no charge
e - positive charge
f - negative charge
g - has mass
h - has no mass
Group of answer choices
1) b, d, and h
2) a, e, and h
3) b, d, and g
4) c, d, and h
1) Write the symbol and charge for each individual ion
2) Balance the charge so that they equal to zero
3)Write the formula based on how many of each ion you used in step 2
6) Nitrogen and Barium
7) strontium and fluorine
8) iodine and calcium
9) magnesium and sulfur
10) Sulfur and aluminum
N -3
Ba +2
Sr +2
F -1
I -1
Ca +2
Mg +2
S -2
S -2
Al +3
//
Ba3N2
SrF2
CaI2
MgS
Al2S3
//
I don't really understand 2.
1. Which of the following is the most important function of the microscope?
A. measuring specimen
B. magnification of the specimen
C. photographing the specimen
D. locating and viewing the specimen
image or
PLEASE HELP ME !!!!
The octet rule states that atoms tend to form bonds so that each atom has eight ________ in its _______
shell
Answer:
electrons..............
Answer:
electrons, outer
Explanation:
Plzzzzz I need help ASAP
Answer:
i) B, ii) A, iii) C
Explanation:
give me brainliest
1) In which state of matter will particles move the fastest?
Answer:
Gases
Explanation:
The particals will move around rapidly in all directions.
Hi please help with these questions :)
Answer:
c
Explanation:
because electricity has a good conduct tha is mental
In the formula XS04, the symbol X could represent the element*
O (1) AI
O (2) Ar
O (3) Mg
0 (4) Na
When calculating the AH of a reaction, why is it important that you include the correct stale symbols in your balanced chemical equation?
Answer: c. so that you use the correct energy states
Explanation:
Enthalpy is the energy release or energy produced when a chemical reaction is carried out.
Enthalpy change is calculated by substracting the energy of reactants from the energy of products.
[tex]\Delta H=H_{products}-H_{reactants}[/tex]
As the energies are different for different states and thus the correct stale symbols in your balanced chemical equation must be given so that we use the correct energy values.
If you know the atomic number and the mass number of an atom of any element, you can determine the atom's composition.
A:True
B:False
True. i hope its correct, have a good day. stay happy and stay safe
Answer:
A:true
Explanation:
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules.
what is a second degree burn
Please help with chem ASAP
Answer:
Imagine Dragon
Explanation:
These balls across yo face
Gottem
I NEED HELP ASAP, If you help me I’ll give you Brainlist [Calorimetry and specific heat lab]
I don’t know how to calculate the error %
The formula is:
%Error = [I Accepted value-Experimental value I / Experimental value] x 100 can someone please PLEASE help me :(
Answer:
Explanation:
I gave this formula as
What you should get - what you got
--------------------------------------------------- * 100
What you should get
Suppose you are talking about the specific heat of copper and you did a lab and did it fairly well and the specific heat came out to be 0.33
That's what you got, 0.33
What you should get is 0.35 according to the table you've given us.
% error = 0.35 - 0.33
-------------- * 100
0.35
% error = 0.02 * 100/ 0.35
% error = 2/0.35
% error = 5.71
Now here is the really hard part. You have to decide what a positive error is and what a negative error.
A positive error using this formula means you are too low.
A Negative error means that you are too high, just the opposite of what you might think.
Can you show us the experimental value?
So basically, the accepted value would be under the Specific heat capacity of metal (e.g. 0.90, 0.35, 0.44, 0.12).
Your experimental value would be the specific heat capacity that you got from the lab.
You would first substract the experimental value from the accepted value
[tex]accepted \: value - experimental \: value [/tex]
and then you would divide the result by the experimental value
[tex]result \div experimental \: value[/tex]
and then, you would multiply the result of that by a hundred to get your percentage
[tex]result \times 100 = \% \: error[/tex]
//
The image shown is an example.
0.90 is our accepted value.
0.88 is our experimental value.
The overall percentage error I got is %2.27
How cold does it really get on Pluto's moon, Charon? (I know this is not a Chem question per se, but is there no Earth Science, nor Space, nor Astronomy, nor General Science category on Brainly?)
Answer:
Explanation:
After various studies and experiments conducted on Pluto's moon, Charon it has been determined that it gets to minus 459.67 degrees Fahrenheit which would be equivalent to minus 273.15 degrees Celsius. This is the coldest temperature that scientists have registered for Charon. This temperature is nearing absolute zero and puts it colder than Pluto itself since Pluto's temperature is believed to get to minus 400 degrees Fahrenheit which is equivalent to minus 240 degrees Celcius.
PLEASE HELP ME
Anything that has mass and takes up space is
A. Volume
B. Mass
C. Matter
Choose one option
A, B, C
Answer:
C. Matter
Explanation:
list 10 uses of composite
Aerospace
Thermoset composites are being specified for wings, fuselages, bulkheads, and other applications in commercial, civilian and military aerospace applications.
Appliance/Business
Thermoset composite are being used in frames, equipment panels, handles and trims in appliances, power tools, business equipment and many other applications.
Thermoset composites for the appliance industry are used in washers, dryers, refrigerators, freezers, ranges, ovens, dishwashers for components that include control panels, handles, knobs, vent trims, side trims, motor housings, kick plates and many others.
Automotive/Transportation/Farm/Construction
Composites are now being used in vehicle and equipment applications, including, panels, frames, interior components and other parts.
Civil Infrastructure
Some composite infrastructure applications include buildings, roads, bridges and pilings.
Construction
Thermoset composites are replacing many traditional materials for home and offices architectural components including fixtures, doors, wall panels, roofing, window frames, moulding, vanity sinks, shower stalls and even swimming pools.
Corrosive Environments
Composites are ideal for applications in corrosive environments, such as chemical processing plants, pulp and paper converting, oil and gas refineries and water treatment facilities. Common applications include fans, grating, tanks, ducts, hoods, pumps and cabinets.
Electrical
With strong dielectric properties including arc and track resistance, Thermoset components include substation equipment, microwave antennas, standoffs and pole line hardware and printed wiring boards. Applications and components include switchgear, motor controls, standoff insulators, control system components, circuit breakers, arc chutes, arc shields, terminal blocks, terminal boards, metering devices, bus supports and lighting components.
Marine
With their corrosion resistance and light-weighting attributes, Marine composite applications include boat hulls, bulkheads and other components for military, commercial and recreational boats and ships.
what element is 1s22s22p63s23p64s23d104p65s1
Answer:
Rubidium
Explanation:
Add the exponents: 2+2+6+2+6+2+10+6+1=37
Look for the atomic number 37
The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .
What is an element ?A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.
The most vital ingredient for life is carbon. Life as we know it would not exist without this element. You'll see that carbon is the main component of the chemicals required for life.
Thus, The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .
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