1.42x10^24 molecules
40.0 grams NH3 (6.02x10^23/17.0 grams NH3)= 1.42x10^24 molecules
List the following elements from increasing electronegativity: boron, magnesium, calcium, chlorine, argon
Answer:
The list of elements from increasing electronegativity: Calcium < magnesium < chlorine < argon < boron.
Explanation:
In the periodic table if you move from left to right there would be an increase in the electronegativity of the elements. If you move from the bottom to the top of the groups in the periodic table the electronegativity increases and if u move to the bottom from down its decreases.
Calcium is in the 2nd group below magnesium so calcium is the least electronegative among given elements then magnesium and then chlorine as it is top of magnesium then argon, as it is right to the chlorine, and boron has the most electronegativity as it is above rest of the elements.
A 0.582 mol sample of an ideal gas is at 15°C and 18.8 atm. Calculate the volume for this gas.
Answer: The volume for this gas is 0.732 L.
Explanation:
Given : No. of moles = 0.582 mol
Temperature = [tex]15^{o}C = (15 + 273) K = 288 K[/tex]
Pressure = 18.8 atm
Using the ideal gas equation, volume for the given gas is calculated as follows.
PV = nRT
where,
P = pressure
V = volume
n = number of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula.
[tex]PV = nRT\\18.8 atm \times V = 0.582 mol \times 0.0821 L atm/mol K \times 288 K\\V = \frac{0.582 mol \times 0.0821 L atm/mol K \times 288 K}{18.8}\\= \frac{13.761}{18.8}\\= 0.732 L[/tex]
Therefore, it can be concluded that the volume for this gas is 0.732 L.
Balance the following reaction
HgO → _ Hg +_ 02
Answer:
reeeeeeeeeeeeeeeeeeeee
Explanation:
cancer
How many molecules are in 88g of carbon dioxide?
Answer:there are 44 grams
GAS LAW:
If 2.2 liter of hydrogen are heated from 0 degrees celsius to 95 degrees celsius at the constant pressure what is the new volume?
Answer:
bh yftd5xsdcfvgbhnjm
Explanation:
The nucleus in the center of an atom contains ___ and __ ?
Answer:
protons and neutrons
Explanation:
The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
A 2.25 mol sample of oxygen occupies 1.80 L at 25.0°C. What volume will
it occupy with 3.7 moles?
Answer:
2.96 L
Explanation:
We apply the Ideal Gases Law to determine this:
P . V = n . R . T
Firstly we need to know the pressure for the 2.25 moles
P . 1.80L = 2.25 mol . 0.082 L.atm/mol.K . 298K
(We convert T°C to T°K, 25°C + 273 = 298K)
P = (2.25 mol . 0.082 L.atm/mol.K . 298K) / 1.80L
P = 30.5 atm
So now, we apply the pressure value for the new conditions:
30.5 atm . V = 3.7 mol . 0.082 . 298K
V = (3.7 mol . 0.082 . 298K) / 30.5atm = 2.96 L
8. What is involved in building and running the mine
Answer:
Explanation:
minimizing environmental effects.
ensuring public health and safety.
preserving water quality.
establishing new landforms and vegetation.
removing waste and hazardous material.
stabilizing land to protect against erosion.
Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
1) 5*10^23 molecules of O2
2) 263 grams of Xe
3) 0.403 moles CH4
4) they would all have the same volume
Answer:
d
Explanation:
they would all have the same volumes
Sally adds 3.13 moles of argon to a 5.29 liter balloon that already contained 4.21 moles of argonWhat is the volume of the balloon after the addition of the extra gas?
as- The salt left in the evaporating
basin is often a little dirty
suggest what you could do to
get cleaner salt
Answer:
Pour the filtrate into an evaporating basin. Heat the salt solution gently until it starts to decrepitate .keep eye protection on and do not get too close. Turn off the Bunsen burner and let the damp salt dry in the dish
In evaporation particles of water take energy in the form of sunlight from the surrounding and then convert into vapor phase. Therefore heating is the only technique for getting pure salt.
What is evaporation?Evaporation is a physical process in which the water in liquid state converts to gaseous state at the temperature below its boiling point. Evaporation happens before the boiling process.
Evaporation causes cooling effect in the surrounding. During summer when water is kept in earthen pot water cools, this is because of the evaporation process.
Evaporation is affected by temperature. As the temperature increases the rate of evaporation increases and hence in summer there is more evaporation and hence there is lot more water in air.
Pour the filtrate into an evaporating basin. Heat the salt solution gently until it starts to decrepitate .Turn off the Bunsen burner and let the damp salt dry in the dish.
Therefore heating is the only technique for getting pure salt.
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250J of heat was added to a 2 g block of metal. The temperature of the metal was increased by 139.4K. What is the specific heat capacity of the metal?
Use the below equation to calculate specific heat capacity.
Include three decimal places and do not use units in your answer.
cmetal = Q/mΔT
Answer:
0.897
Explanation:
What is the concentration of a solution with a volume of .45 L that contains .9 moles of Iron (II) chloride?
Answer:
the concentration of the solution is 2 mol/L.
Explanation:
Molarity is defined as the concentration of a solution expressed in terms number of moles of solute per liter of solution.
Mathematically Molarity is expressed as follow;
[tex]Molarity = \frac{Moles \ of \ solute}{Liters \ of \ solution} \\\\[/tex]
Given;
Volume of the solution, V = 0.45 L
Moles of the solute, n = 0.9 moles
The concentration of the solution [tex]= \frac{0.9}{0.45} = 2 \ mol/L[/tex]
Therefore, the concentration of the solution is 2 mol/L.
1 point
Calculate the [H+] in a solution with a pH of 3.71, and identify the solution
as acidic, basic or neutral. *
1.9x10^-4 M ; acidic
5.12x10^-10; acidic
02.4x10^-3 M ; basic
Answer:
I don't have any idea of this question
Which of the following solution(s) would be a buffer? Select all that apply.
a. 100.0 mL of a solution that contains 0.100 M benzoic acid and 0.100 M potassium benzoate
b. 100.0 mL of a 0.100 M propanoic acid to which 50.0 mL of 0.100 M sodium hydroxide has been added
c. 100.0 mL of a 0.100 M formic acid solution
d. 100.0 mL of a solution that contains 0.100 M hydrochloric acid and 0.100 M sodium chloride
e. 100.0 mL of a 0.100 M solution of acetic acid in which 0.100 g of sodium acetate is dissolved
As a buffer is defined as the aqueous mixture of a weak acid and its conjugate base. Or a weak base and its conjugate acid. Thus:
a, b and e would be a buffer.The benzoic acid is a weak acid, its conjugate base is the benzoate ion that comes from potassium benzoate. Thus: a is a buffer.
Propanoic acid (weak acid) reacts with a strong base as sodium hydroxide producing its conjugate base (propanoate ion). Thus, b is a buffer.
Formic acid is a weak acid but its conjugate base, formate ion is not present in the solution. Thus, c is not a buffer.
Hydrochloric acid is a strong acid and sodium chloride a salt. Thus, d is not a buffer.
Acetic acid is a weak acid, and its conjugate base, acetate ion (That comes from sodium acetate) is present in the solution. Thus, e is a buffer.
What is the initial reactant for a fusion reaction in the sun?
a) Iron-56
b) Hydrogen-1
Hydrogen
Pog Pog Pog I'm a PogChamp
Hydrogen-1 serves as the starting reactant in fusion reactions in the sun. This is due to the sun's composition, which is around 70% hydrogen and 28% helium with 2% heavier components. As a result, hydrogen-1 is both the most prevalent and most likely to be employed in a fusion process in the sun.
What is the way to make helium-4 ?Two hydrogen-1 nuclei are fused together to create a helium-4 nucleus in the sun's fusion reaction, which releases energy in the process. This is the most significant energy source in the sun and is known as the proton-proton chain reaction.
When two hydrogen-1 nuclei collide to generate a deuterium nucleus, a gamma ray is released as a result, starting the reaction. Then, this deuterium nucleus strikes another.A helium-3 nucleus is created from a hydrogen-1 nucleus, which also produces a gamma ray.
The reaction is finally finished when two helium-3 nuclei meet to produce a helium-4 nucleus, producing two gamma rays in the process. Since hydrogen-1 is the most prevalent element in the sun and the element that is most likely to be employed in the proton-proton chain reaction, it is the first reactant for a fusion process in the sun.
A deuterium nucleus is created by the collision of two hydrogen-1 nuclei, which is followed by a sequence of further processes that ultimately result in the development of a helium-4 nucleus.
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What is the name of this hydrocarbon
Answer:
the IUPAC name of the following compound is 2,3 dimethyl pentane!
"Reduce, reuse, recycle." Give examples of how one or more of
these ideas can be applied to the issues and practices of hydraulic
fracturing for the acquisition of shale gas.
Answer:
Examples of how the ideas can be applied to the issues and practices of hydraulic fracturing for the acquisition of shale gas are;
Reuse; The produced water in obtained from oil and gas well production are reused for fracking, drilling, and if the water is good enough, it can be used for farming
Reduce; The use of recycled brine and water in drilling and fracking process reduces the application of freshwater in the those processes and reduces pollution of natural water sources
Recycle; Recycling involves creating products from waste. In the hydraulic fracturing process approximately 13 percent of the water produced and the flowback water are recycled to be used more than once thereby reducing the net consumption of freshwater
Explanation:
In hydraulic fracturing, also known informally as fracking, is the drilling method used in oil and gas well development process that makes use of water sand and chemical injection through the well bore to open and widen cracks in the bedrock formations in the areas around the wellbore.
How many moles are present in 34 grams of Cu(OH)2? Show How you got the Answer
Answer:
0.347
Explanation:
moles= mass/molecular mass
moles= 34/64+(16×2)+(1×2)
moles=34/98
= 0.347 (3.s.f)
HF + NaOH ---> NaF + H2O
If you need 1785 g of NaF (sodium Fluoride) how many grams of HF (hydrofluoric acid) do you need?
Answer:
so calculate moles of 1785 g of NaF
this is something = 1785/41.98 =42.52 moles
now one moles of HF is forming one mole of NaF so to get 42.52 moles of NaF we need 42.52 moles of HF
mass = moles × molar mass
mass of HF = 42.52×20.01
mass of HF = 850.82 g
so the conclusion is if you need 1785 g of NaF (sodium Fluoride) you need 850.82 grams of HF (hydrofluoric acid) !!!
I d k it's right or wrong but i tried to solve it, please let me know is it correct or not!!
Science study island
Answer:
C)
Explanation:
They can move at rates of up to four inches (10 centimeters) per year, but most move much slower than that. Different parts of a plate move at different speeds. The plates move in different directions, colliding, moving away from, and sliding past one another. Most plates are made of both oceanic and continental crust.
HELP!! ASSIGNMENT DUE TODAY! PLEASE HELP!!! I'LL GIVE 21 POINTS!!!!
Respiration occurs in the cytoplasm and _________ of cells.
mitochondria
im not 100% sure but it makes sense
How much energy is transferred from a plant to an herbivore that eats it? A. 5% B. 10% C. 20% D. 90%
Answer:
B. 10%
Explanation:
Science there’s a picture
Answer:
D)
Explanation:
seems like the most logical option out of all listed.
What is the pH of a solution that is 100x more acidic than a solution with a pH of 5?
Answer:3
Explanation:
Plz help question is in attachment
Answer:
The total mass will be same of both side!!!!! ig so
6. Too much rainwater can cause a slope or hillside to collapse through a process called a
(6 Points)
mudslide
snowslide
o avalanche
storm
Answer:
mudslide
Explanation:
a mass of mud and other earthy material that is falling or has fallen down a hillside or other slope
PLEASE HELP!!!! Assuming a lacrosse ball weighs 5.5 ounces and is made of mainly rubber which has a mass of 82.2 g/mol, how many particles are in a lacrosse ball?
Which term describes the following group of planets: Jupiter, Saturn, Uranus, and
Neptune?
Answer:
Gas giants.
Explanation:
Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.
Students place paper clips on a desk and then hold a magnet under the desk. What evidence would BEST show that the
magnetic field was able to pass through the desk?
O A The top of the desk is made of a kind of plastic.
OB. The paper clips move when the magnet is moved under the desk.
OC. The magnet they are using is the largest one in the classroom.
OD. The students were able to pick up these paper clips with a magnet.
Answer:
B
Explanation:
got it right on test
Answer:
Yes the correct answer is B
Explanation:
Have a good day!!!