Answer:
2.20 x 10²⁵ atoms
Explanation:
Atoms of CO= 36.6-mol sample
From Avogadro's constant, which is
(6.022 × 10^ 23 atoms per mole)
Then
Number of atoms=[ 6.022 × 10^ 23 atoms/mole] × [36.6-mol]
= 2.20 x 10²⁵ atoms
Hence, number of atom is 2.20 x 10²⁵ atoms
Need help is label a warm area or is b Orr are they both warm
Answer:
your image is a blavk screen so we cant tell
Explanation:
The half-life of argon-39 is 269 years. It decays into krypton-39. After 1,076 years, what fraction of the original amount of argon-
1/16
1/4
1/2
1/8
Answer:
The correct answer is - 1/16.
Explanation:
The half-life is the time that is required to decay nuclei to the half amount of its original amount in a radioactive sample. It is represented by the t1/2. The time that is required to reduce to half of its initial value is known as the half-life of a particular sample.
Half-life of argon-39 = 269 years
total time is taken in complete decay = 1076 years
Number of half-lives required = 1076/269
= 4
So the original amount of the sample = (1/2)^n
n = number of half-life
= 1/2^4
= 1/16
The correct answer is = 1/16
A 250 mL beaker is submerged in a large container of Liquid X and turned upside down, and another 250 mL beaker is submerged and turned upside down in a large container of Liquid Y. Hydrogen (H2) gas is bubbled into each upside-down beaker until 100 mL of liquid has been displaced. The masses m X and my of hydrogen inside each beaker is then chemically determined.
a. mx will be greater than my
b. m x will be less than my
c. mx will be equal to my
d. It's impossible to predict whether mx or my will be greater without more information.
Answer:
Mx will be less than My.
Explanation:
The correct option is - Mx will be less than My.
Because, liquid X have been higher viscosity and vapor pressure than liquid B.
Vapor pressure of liquid A is greater, so the amount of liquid X will vaporized greater and H2 gas has been displaced greater from the beaker as compared to liquid Y.
The amount of H2 in liquid Y remains greater in beaker as compared to liquid X.
So, Mx will be less than My.
Electrolysis is used in the electroplating of metals. The same amount of current is passed through separate aqueous solutions of CuSO4, Sn(SO4)2 and Cr2(SO4)3 in separate electrolytic cells for the same amount of time. State and explain which cell would deposit the greatest amount (in mol) of metal. Identify the electrode at which the metal is deposited.
Answer:
CuSO4 cell will have the greatest amount of deposit among all three. The deposit will occur at the cathode
Explanation:
The valence of the elements in this case is as follows -
Cu - 2e-
Sn - 4e-
Cr - 3e-
CuSO4 cell will have the greatest amount of deposit among all three
The atoms of copper metal will deposit at the cathode. At the cathode, the least number of moles of electrons needed .
Hence, more amount of copper can be extracted out by the electrolyte
Use mass-mass calculation, determine how many grams of sodium chloride SHOULD have been produced from the amount of sodium bicarbonate in mass (B.)
Answer:
where is the question???
suppose you are analyzing an antacid that contains Mg(OH)2 and Al(OH)3 in a 1:1 molar ratio. The antacid was neutralized with an excess of 0.500 M HCl, and the excess HCl was then back titrated with 0.500 M NaOH. The following data was obtained: Volume of 0.500 M HCl utilized: 38.25 mL Volume of 0.500 M NaOH utilized: 3.60 mL Calculate the masses of Mg(OH)2 and Al(OH)3 contained in the antacid.
Answer:
0.202g of Mg(OH)₂ and 0.270g of Al(OH)₃
Explanation:
The OH⁻ ions of the Mg(OH)2 and Al(OH)3 reacts with the HCl. The HCl in excess reacts with the NaOH. To solve this question we must find the moles of HCl that react in the beginning with the antiacid and as the ratio is 1:1 we can find the moles of Mg(OH)2 and Al(OH)3. The reactions are:
OH⁻ + HCl → Cl⁻ + H₂O
HCl + NaOH → NaCl + H₂O
Moles HCl added:
0.03825L * (0.500mol / L) = 0.019125 moles
Moles NaOH utilized:
0.0036L * (0.500mol / L) = 0.0018 moles
Moles HCl that react = Moles OH⁻ in the antiacid
0.019125 moles - 0.0018moles =
0.017325 moles OH⁻ in the antiacid
As the ratio is 1:1. the moles Mg(OH)2 = Moles Al(OH)3
And these 5 hydroxides produce 0.017325 moles:
5X = 0.017325 moles
X = 3.465x10⁻³ moles
Where X are moles of both Mg(OH)2 and Moles Al(OH)3
Mass -Molar mass: 58.3197 g/mol-:
3.465x10⁻³ moles * (58.3197g/mol) =
0.202g of Mg(OH)₂And
Mass -Molar mass: 78g/mol-:
3.465x10⁻³ moles * (78g/mol) =
0.270g of Al(OH)₃the experimental control is the ?
A. Dependent variable
B. Design of the experiment.
C. Outcome of the experiment
D. the standard against which the results are measured .
Answer:
D. In an experiment, one of the variables will be giving a placebo and the other, a treatment
Explanation:
Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
How many moles are in 6 x 10^23 molecules of H2O
Is lighting a match a chemical change?
Answer:
yes
Explanation:
Lighting a match and letting is burn is an example of a chemical change.
Matches use sulfur, phosphate and a friction agent held together by a binding agent. Together, the oxygen and sulfur burn slowly, igniting the wood of the match for a flame that lasts long enough to see by, light a candle or ignite a campfire.
What can you infer about the air pressures over the land and ocean? Explain your answer.
Answer:
Answer: During the day, the sun heats up both the ocean surface and the land. ... The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean.
Explanation:
A gas cylinder is filled with 5.50 moles of oxygen gas at 83°C. The piston is compressed to yield a pressure of
400.0 kPa. What is the volume inside the cylinder?
Answer:
volume=0.04322m3
Explanation:
acording to ideal gas equation that PV=nRT
In what direction does thermal energy transfer?
Answer:
Either direction
Explanation:
If you cook food it would go from cold to hot. If you were to put a drink in the fridge it would go from hot to cold. So it is either direction.
Use the Gizmo to mix 200 g of copper at 100 °C with 1,000 g of water at 20 °C. Record the data and calculated answers for copper in the 2 tables below. Accepted values for % error calculations can be found below these 2 tables.
DATA
Copper
Lead
Mass of Metal
Initial Temperature of Metal
Mass of Water
Initial Temperature of Water
Final Temperature of Water
CALCULATIONS
Copper
Lead
Temperature Change of Water
Heat Gained by Water
Heat Lost by Metal
Temperature Change of Metal
Specific Heat of Metal
% Error
Use the Gizmo to mix 200 g of lead at 100 °C with 1,000 g of water at 20 °C. Record the data and answers to the calculations for lead in the 2 tables above.
Metal
Accepted Specific Heat (J/g⁰C)
aluminum
0.900
lead
0.160
copper
0.385
tin
0.228
steel
0.460
Insert a picture of your work for the calculations table here.
Answer:
Explanation:Use the Gizmo to mix 200 g of copper at 100 °C with 1,000 g of water at 20 °C. Record the data and calculated answers for copper in the 2 tables below. Accepted values for % error calculations can be found below these 2 tables.
DATA
Copper
Lead
Mass of Metal
Helen is studying the properties of solids. She is comparing the wooden cube and the steel cube shown in the picture below.
mc065-1
Which property is the same for the two cubes?
color
luster
texture
volume
A chemist needs to determine the concentration of a solution of nitric acid, HNO3. She puts 905 mL of the acid in a flask along with a few drops of indicator. She then slowly adds 0.200 M Ba(OH)2 to the flask until the solution turns pink, indicating the equivalence point of the titration. She notes that 235 mL of Ba(OH)2 was needed to reach the equivalence point.
Required:
a. How many moles of Ba(OH)2 are present in 225 mL of 0.200 M Ba(OH)2?
b. How many moles of HNO3 are present if 4.50 x 10^2 mol of Ba(OH)2 was needed to neutralize the acid solution? (Express your answer numerically in moles)
Answer:
See explanation
Explanation:
The equation of the reaction is;
2HNO3(aq) + Ba(OH)2(aq) -------->Ba(NO3)2(aq) + 2H2O(l)
a) The number of moles of Ba(OH)2 = 225/1000 * 0.200
= 0.045 moles
From the reaction equation;
2 moles of HNO3 require 1 mole of Ba(OH)2
x moles of HNO3 require 4.50 x 10^2 mol of Ba(OH)2
x = 4.50 x 10^2 * 2/1
x = 9 x 10^2 moles of HNO3
A reaction was experimentally determined to follow the rate law, Rate = k[A] where k = 0.15 s-1. Starting with [A]o = 0.225M, how many seconds will it take for [A]t = 0.0350M?
Answer:
The time the reaction takes is 12.4s
Explanation:
A reaction that follows the rate law:
Rate =k[A] is order 1 and follows the equation:
Ln[A] = -kt + ln[A]₀
Where [A] is concentration of the reaction after time t: 0.0350M
k is rate constant = 0.15s⁻¹
t is time in seconds
[A]⁰ is initial concentration = 0.225M
Ln[0.0350] = -0.15s⁻¹*t + ln[0.225]
-1.86075 = -0.15s⁻¹*t
12.4s = t
The time the reaction takes is 12.4s
I need help pls!!!!
Answer:
A
Explanation:
jsgsnsbnss care about explaimi
I will mark brainliest plz help me!!!
What kind of weather forms with an occluded front?
balance and find out the coefficients of reactions and products
Answer:
2, 1, 1, 4.
Explanation:
Hello there!
In this case, for the given chemical reaction:
[tex]H_2SO_4+Pb(OH)_4\rightarrow Pb(SO_4)_2+H_2O\\[/tex]
We can see how there is one SO4 on the left and two on the right, thus, we add a 2 in front of H2SO4:
[tex]2H_2SO_4+Pb(OH)_4\rightarrow Pb(SO_4)_2+H_2O\\[/tex]
Next, since there are 8 atoms of hydrogen on the left and two on the right, we add a 4 in front of H2O to obtain:
[tex]2H_2SO_4+Pb(OH)_4\rightarrow Pb(SO_4)_2+4H_2O\\[/tex]
Which is now balanced so the coefficients 2, 1, 1, 4.
Best regards!
BIOCR
1 Co
> Co
Answer the question below. Use the rubric in the materials for help if needed.
>
Describe the process used to determine how many atoms of each element are in 2Ca3(PO4)2. Show all
your work.
Answer:
Six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six
Explanation:
Hello there!
In this case, according to the molecular formula of the two moles of calcium phosphate:
[tex]2Ca_3(PO_4)_2[/tex]
Thus, in order to calculate the atoms of each atom, it is necessary to multiply the two in front of the formula by the subscripts in the reaction:
[tex]atoms Ca=2*3=6\\\\atoms P=2*2=4\\\\atoms O=2*2*4=16[/tex]
Thus, we obtain six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six.
Best regards!
Which of these would a mechanical engineer do?
Answer:
I dont see the answers
Explanation:
Explain why each of these elements occur as diatomic molecules, Match the words in the left column to the appropriate blanks in the sentences on the right.
triple
double
octet
single
duet
When two hydrogen atoms pair together, they form a ____bond to achieve a complete _______which is a stable configuration.
When two halogens poir together,they form a________bond to achieve a complete_______ which is a stable configuration
to achieve a completo
When two oxygen atoma pair together, they form a_________bond to achieve a complete which is a stable configuration
When two nitrogen atomo poir together, they form a_________bond to achieve a complete which is a stable configuration
Answer: When two hydrogen atoms pair together, they form a single bond to achieve a complete duet which is a stable configuration.
When two halogens poir together,they form a single bond to achieve a complete octet which is a stable configuration
When two oxygen atoma pair together, they form a double bond to achieve a complete octet which is a stable configuration
When two nitrogen atoms pair together, they form a triple bond to achieve a complete octet which is a stable configuration
Explanation:
The tendency of atoms to achieve a noble gas configuration that is eight valence electrons is said to be octet rule. This is done to attain noble gas configuration and stability.
In order to attain stability the atoms tends to have eight electrons in its valence shell which can be obtained by either by sharing of electrons or complete transfer of electrons.
Hydrogen [tex](H:1s^1)[/tex] has one valence electron each, so sharing of electrons result in formation of single bond and the same electron configuration as the Helium and thus complete its duet.
Halogens [tex](F:1s^22s^22p^5)[/tex] have 7 valence electron each, so sharing of electrons result in formation of single bond. The stable noble gas configuration is attained and thus complete its octet.
Oxygen [tex](O:1s^22s^22p^4)[/tex] has six valence electrons each, so sharing of two electrons result in a double bond. The stable noble gas configuration is attained and thus complete its octet.
Nitrogen [tex](N:1s^22s^22p^3)[/tex] has 5 valence electrons, so sharing of three electrons result in a triple bond. The stable noble gas configuration is attained and thus complete its duet.
A 38.22 mL aliquot of weak acid that has a concentration of 0.882 M will be titrated with 0.289 M NaOH. Calculate the pH of of the solution upon neutralization of half of the weak acid. The Ka of the acid is 6.8×10-7.
Answer:
pH = 6.167
Explanation:
The weak acid, HX, reacts with NaOH as follows:
HX + NaOH → NaX + H₂O
Where 1 mole of HX with 1 mole of NaOH produce 1 mole of NaX (The conjugate base of the weak acid).
Now, using H-H equation:
pH = pKa + log [NaX] / [HX]
Where pH is the pH of the buffer
pKa is -log Ka = 6.167
And [NaX] [HX] are the molar concentrations of each specie
Now, at the neutralization of the half of HX, the other half is as NaX, that means:
[NaX] = [HX]
And:
pH = pKa + log [NaX] / [HX]
pH = 6.167 + log 1
pH = 6.167Which of the following would be considered renewable resources? You may choose more than one.
oil
corn
clean air
forests
Answer:
clean air
Explanation:
2. A 0.45g sample of mineral ore is analyzed for chromium and found to contain
0.560mg Cr2O3. Express the concentration of Cr2O3 in the sample as:
(a) Percent (%)
(b) Parts per thousand (ppt)
(c) Parts per million (ppm)
(d) Parts per billion (ppb)
Answer:
Explanation: I don't know
What is the highest occupied level of Carbon
Answer:
Highest occupied level of carbon is 3
Explanation:
its called Alkynes
Explanation:
4trust me!#carryonlearning❤Identify the Lewis base in this balanced equation: 6 upper H subscript 2 upper O plus UPper C r (upper H subscript 2 upper O) subscript 6 superscript 3 plus. H2O Cr3+ Cr(H2O)63+
The Lewis base that we can see in the equation is [tex]H_{2} O[/tex]
What is the Lewis base?We have to bear in mind that the Lewis base is the substance that is able to donate a pair of electrons. The substances that is able to accept the pair of electrons is what we call the Lewis acid.
The Lewis acid must possess a space for the addition of an electron pair while the Lewis base would have to be a specie that has a lone pair of electrons or has a negative charge. Thus the water molecule would serve as a Lewis base in this regard.
Learn more about Lewis base;https://brainly.com/question/15570523
#SPJ1
Answer:
6 upper H subscript 2 upper O plus UPper C r (upper H subscript 2 upper O) subscript 6 superscript 3 plus.
✔ H2O or A.)
Cr3+
Cr(H2O)63+
What's a household item that has  electrical energy
Answer:
Washing machine.
Dryer.
Television.
Cell phone.
Explanation:
Answer:
Washer and dryer, TV, Cell phone
Explanation:
Glucose and alcohol Contain hydrogen
but they are not adds Why?
Answer:
Ans. Alcohols and glucose though contain hydrogen but do not ionise in the solution to produce H+ ions. This is proved by the fact that there solutions do not conduct electricity.
What was the purpose of letting the transformed cells sit in LB for a few minutes before spreading them onto the plates?
A. This allows time for the cells to express the antibiotic resistance gene
B. This allows the cells to take up the plasmid after the heat shock procedure
C. This allows time for the cells to warm up before plating
D. This allows cells time to start glowing green