Answer:
Yung explain
Explanation:
Shu makou du mang sugumani hinam dilomaoan
how many sulfur atoms are there in 5.5 moles?
Answer:
3.31x10^24 atoms
Explanation:
1 mole of S atom = 6.023^23 atoms
5.5 moles = 5.5 x 6.023^23
= 3.31x10^24 atoms
If a drop of red dye is placed in the middle of a shallow dish of water, the dye will diffuse slowly and a red cloud of dye will grow larger with time.
a. True
b. False
Answer:
True
Explanation:
Diffusion is the movement of the particles of a substances from a region of higher concentration to a region of lower concentration.
Diffusion occurs in response to a concentration gradient.
In this case, the dye is at a higher concentration at the middle of the shallow dish of water. Diffusion causes the dye to spread out gradually thereby causing the red cloud to grow larger with time.
Please hurry!
Best answer gets Brainliest!!
Please answer the question ASAP
Scientists clarify an element based on what criteria
A)Atomic number
B)Mass number
C)Atomic mass
D)Atomic symbol
In 1773 Benjamin Franklin, investigating the calming effect of oil on the water of a pond near London, observed that a teaspoonful of oil would cover about half an acre of the surface. From this information, estimate the height or thickness of an oil molecule in the floating film of oil. Then estimate the cross sectional area of an oil molecule in the floating film You may assume that Franklin used a lamp oil, like camphene, C10H16.
Required:
Calculate the thickness (in nm) of the surface film and the surface area (in nm2) occupied by an oleic acid molecule on water.
Answer:
a. 2.44 nm
b. 15.33 nm²
Explanation:
a. Calculate the thickness (in nm) of the surface film
Since the volume of a teaspoon equals V = 4.93 cm³ and the area of the oil film is half an acre = 1/2 × 4046.86 m² = 2023.43 m²
The volume of the oil film, V' equals the volume of the oil in the teaspoon, V
V' = Ah where A = cross-sectional area of oil film = 2023.43 m² = 2023.43 × 10⁴ cm² and h = height of oil film
So, V' = V
Ah = V
h = V/A
= 4.93 cm³/2023.43 × 10⁴ cm²
= 0.00244 × 10⁻⁴ cm
= 2.44 × 10⁻⁷ cm
= 2.44 × 10⁻⁷ cm × 1m/100 cm
= 2.44 × 10⁻⁹ m
= 2.44 nm
b. The surface area (in nm2) occupied by an oleic acid molecule on water.
Since the height of the oil film equals the diameter of the oil molecule, and the molecule is assumed to be a sphere of radius, r. Its surface area is thus A = 4πr²
r = h/2 = 2.44 nm/2 = 1.22 nm
A = 4πr²
A = 4π(1.22 nm)²
A = 4.88π nm²
A = 15.33 nm²
What causes the recognition of an element from its energy signature?
O
A. Each element emits radiations at random frequencies.
B. Each element emits energy that can be transformed into sound.
C. Each element emits electromagnetic waves that travel faster than light.
D. Each element emits electromagnetic waves at a unique set of wavelengths.
Answer:
I'm so sorry if this is wrong but I think its B
the mass in g of 3 moles Al .
Answer:
81 gm
Explanation:
The mass of 1 mole is 27 g
So, Mass of 3 moles of Aluminium would be 3 × 27 = 81 gm..Thus mass of 3 Moles of Aluminium is 81 gm.
1. How many moles of carbon are in 2.25 * 10^22 atoms of carbon ?
Answer:
atoms of C? 2.25 x 1022 atoms C x 1 mole C = 0.037 mol C
Explanation:
How many moles of C are in 2.25 x 1022 atoms of C?
Taking into account the definition of Avogadro's number, 0.037 moles of carbon are 2.25×10²² atoms of carbon.
Definition of Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of carbons
In this case, you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 2.25×10²² atoms are contained in how many moles of copper?
amount of moles of carbon= (2.25×10²² atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of carbon= 0.037 moles
Finally, 0.037 moles of carbon are 2.25×10²² atoms of carbon.
Learn more about Avogadro's Number:
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True/False: Sound waves are produced by vibrating molecules in a direction perpendicular to that of the direction the wave travels.
Answer:
true
Explanation:
0=4
Balance this equation
H₂sicl2+ H₂O → H8Si4O4 + HCl
Balanced Equation is
4H2SiCl2+4H2O → H8Si4O4 + 8HCl
when 18.0 g H20 is mixed with 33.5 g Fe, which is the limiting reactant?
Answer:
si.mple fe
Explanation:
ghhsshzhzbbzhh
How did oxygen first enter Earth's atmosphere?
A. Meteorite impacts
B. Breakdown of Precambrian rocks
C. Biological processes
D. Volcanic outgassing
Answer:
I think c biological processes
What is the definition of bond length?
Group of answer choices
the distance between the two atoms is larger than the sum of their atomic radii
the distance between the two atoms is smaller than the sum of their atomic radii
No correct response
the distance between the two atoms is equal to the sum of their atomic radii
the distance between two electrons
Answer:
C: No correct response
Explanation:
Bond length is simply defined as the distance between two atoms that are participating in a bond.
Now, looking at the options, none of the options correctly defines it this way. The closest is option E which is "distance between two electrons" but it uses the word electrons instead of atoms. Thus none of the statements are correct
H2(g)+I2(s)→HI(s)H2(g)+I2(s)→HI(s) balance equations
Answer:
H2(g)+I2(s)→2HI(s)
Explanation:
Hello there!
In this case, according to the given information and unbalanced chemical reaction, we infer it must be balanced in agreement with the law of conservation of mass because the reactants side has two hydrogen and iodine atoms whereas the products side has just one. In such a way, by placing a 2 on HI, we obtain the following balanced reaction:
H2(g)+I2(s)→2HI(s)
Regards!
What volume of solution is needed to prepare a 0.50M solution of sodium hydroxide using 2.0 g of solute? Show your work
Answer:
0.10 L
Explanation:
First we convert the 2.0 grams of solute (meaning sodium hydroxide) into moles, using its molar mass:
2.0 g ÷ 40 g/mol = 0.05 mol NaOHThen we can calculate the required volume of solution, using the definition of molarity:
Molarity = moles / litersliters = moles / molarity0.05 mol / 0.50 M = 0.10 LHow many unpaired electrons are in the following complex ions?
a. Ru(NH3)62+ (low-spin case)
b. Ni(H2O)62+
c. V(en)33+
Solution :
A complex ion may be defined as a metal ion that is located at the center with other molecules or ions surrounding the center ion.
In the context, the number of the unpaired electrons for the following complex ions are :
1. [tex]$Ru(NH_3)62+$[/tex] (low spin)
[tex]$Ru^{2+} = [Kr] \ 4d^6 \ 5s^0$[/tex]
Here all the d-electrons are paired. Therefore, there are no unpaired electrons.
2. [tex]$Ni(H_2O)62+$[/tex] (high spin)
[tex]$Ni^{2+} = [Ar] \ 4s^0 \ 3d^8$[/tex]
Therefore, it has two unpaired electrons.
3. [tex]$V(en)33+$[/tex] (high spin)
[tex]$V=[Ar] \ 3d^2 \ 4s^0$[/tex]
It has 2 unpaired electrons
When 155 g of water at 20 ᵒC is mixed with 75 g of water at 80 ᵒC, assuming no heat is
lost to the surrounding what is the final temperature of the water. (Specific heat capacity
of water is 4.18 J/°C·g)
Answer:
39.57 °C
Explanation:
Applying,
Heat gain = Heat lost.
cm'(t₃-t₁) = cm(t₂-t₃)................. Equation 1
Where c = specific heat capacity of water, m = mass of the hotter water, m' = mass of the colder water, t₁ = initial temperature of the colder water, t₂ = initial temperature of the hotter water, t₃ = Final Temperature.
Equation 1 above can futher be simplified to
m'(t₃-t₁) = m(t₂-t₃)................. Equation 2
From the question,
Given: m' = 155 g, m' = 75 g, t₁ = 20 °C, t₂ = 80 °C
Substitute these values into equation 2
155(t₃-20) = 75(80-t₃)
Solve for t₃
155t₃- 3100 = 6000-75t₃
155t₃+75t₃ = 6000+3100
230t₃ = 9100
t₃ = 9100/230
t₃ = 39.57 °C
Assuming no heat is lost to the surrounding, the final temperature of the water is 39.57°C.
Given the following data:
Mass of water 1 = 155 gInitial temperature of water 1 = 20°CMass of water 2 = 75 gInitial temperature of water 2 = 80°CSpecific heat capacity of water = 4.18 J/g°CTo determine the final temperature of the water, assuming no heat is lost to the surrounding:
The quantity of heat lost by the water 1 = The quantity of heat gained by the water 2.
[tex]Q_{lost} = Q_{gained}\\\\m_1c\theta = m_2c\theta\\\\m_1\theta = m_2\theta\\\\m_1(T_2 - T_1) = m_2(T_3 - T_2)[/tex]
Substituting the given parameters into the formula, we have;
[tex]155(T_2 -20)=75(80-T_2 )\\\\155T_2 -3100=6000-75T_2\\\\155T_2 +75T_2=6000+3100\\\\230T_2=9100\\\\T_2=\frac{9100}{230}[/tex]
Final temperature = 39.57°C
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A study is conducted to examine the effect of NaCl concentration on enzyme activity with the following results. Activity was tested at various salt concentrations. Negative controls were conducted without enzyme. Which of the following is the best interpretation of the 0.27 p value when comparing the activity at 0.1 M to that 1t 0.05M
NaC1 Con (M) 0 0.01 0.02 0.05 0.1 0.2
Avg. Activity (nm/mg/min) 15.5 14 35.5 175.5 195 50.5
Standard Deviation 1.5 1.5 3.6 17 20 5
T-test vs 0.1M <0.05 <0.05 <0.05 0.27 NA <0.05
T-test vs Neg. Ctrl 0.56 0.6 <0.05 <0.05 <0.05 <0.05
a. The activity at 0.1 M NaCl is statistically significantly greater than that at 0.05M NaCl
b. There is a 27% difference between the average enzyme activities at 0.1 and 0.05 M NaCl
c. The variability among the replicates at 0.1 M and 0.05 M NaCl is 27%
d. The activity at 0.1 M NaCl is not statistically significantly greater than that at 0.05M NaCl
Answer:
The answer is "Option D".
Explanation:
The behavior of 0.1M NaCl also isn't substantially larger objectively than those of 0.05M NaCl because a p-value above 0.05 (p>0.05) indicates no ability to tell differential and is a strong proof in favor of a null hypothesis.
The other wrong choices can be defined as follows:
Option A as it's just the reverse of the correct answer to the null.Options B and C because p worth tests to support nor oppose the null hypothesis.What mass of sucrose is needed to make 300.0 mL of a 0.5 M solution? (molar mass=
342.34 g/mol)
What is Climate Change and how can it effect plants?
Answer:
Climate change will make plants—and us—thirstier. The combined effects of increased CO2 levels and warmer temperatures will increase water consumption by vegetation. That will lead to water declines in streams and rivers like the Ashepoo River in South Carolina
Explanation:
What type of material is commonly used in 3d Printing?
O Wood
O Honey
O Plastics
O Stone
Don’t know pls help fast
Answer:
Plastics!!!!!
Explanation:
How do you print stone or honey or wood you melt plastic or filiment to print stuff
1. How much heat (in calories) is needed to raise 20 g of H2O from 5°C to 40°C? (c = 1.0 cal/g °C)
Answer:
700 calories
Explanation:
Using the formula below:
Q = m × c × ∆T
Where;
Q = amount of heat required (calories)
m = mass of substance (g)
c = specific heat of substance (cal/g°C)
∆T = change in temperature (°C)
According to this question, the following information was provided;
Q = ?
m = 20g
c = 1.0 cal/g °C
∆T = 40°C - 5°C = 35°C
Using the formula; Q = m × c × ∆T
Q = 20 × 1 × 35
Q = 700 calories
Hence, 700 cal of heat energy is needed to raise 20 g of H2O from 5°C to 40°C.
A 16.0 L sample contains 0.80 moles of a gas. If the gas is at the
same pressure and temperature, what is the number of moles when
the volume increases to 24.0 L? NOTE: You must show your
calculation on the attached scratch paper, including which of the
Gas Law formulas you used. *
A. 0.83 mol
B. 1.2 mol
C. 0.53 mol
D. 1.9 mol
(Please show your work)
[tex]\huge\bf\red{\underline{\underline{Answer:-}}}[/tex]
Here, 16 L = 0.80 Mole
Or, 1 L = ( 0.80 / 16 ) MoleOr, 1 L = 0.05 Mole_____________________________
Now, 24 L = 0.05 × 24 = [tex] \frac{5}{100} \times 24[/tex]= 120/100= 12/10= 1.2 Mole ( Ans )0.350 moles of H2O is equivalent to (blank amount) molecules of water.
Answer:
is has around 1/5 lyrics of water
Answer:
[tex]1 \: mole \: = \: 6.02 \times {10}^{23} \: molecules \\ 0.350 \: moles \: = \: (0.350 \times 6.02 \times {10}^{23} ) \: molecules \\ = 2.107 \times {10}^{23} \: molecules[/tex]
Atomic number: 19 is what Chemical symbol?
Answer:
oficialismo hemostasia Jalisco
Answer:
K
Explanation:
Potassium is atomic no 19 and it is k because is from kalium, the Meldiaeval Latin for potash, which may have derived from an arabic word quality, meaning alkali.
Atomic mass, 39.098amu
Oxidation status, +1
Year discovered, 1807
Melting point, 63.28 degrees Celsius(145.90degrees Fahrenheit )
Boiling point, 760 degrees Celsius (1400 degrees Fahrenheit )
Do all the words in a sentence do the same job
Answer:
No all the words in a sentence have their different job..stay safe healthy and happyWhat volume of 10 M HCl must be used to create 100 mL of a 5 M solution.
Answer: A volume of 50 mL of 10 M HCl must be used to create 100 mL of a 5 M solution.
Explanation:
Given: [tex]V_{1}[/tex] = ?, [tex]M_{1}[/tex] = 10 M
[tex]V_{2}[/tex] = 100 mL, [tex]M_{2}[/tex] = 5 M
Formula used to calculate the volume is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\10 M \times V_{1} = 5 M \times 100 mL\\V_{1} = 50 mL[/tex]
Thus, we can conclude that a volume of 50 mL of 10 M HCl must be used to create 100 mL of a 5 M solution.
Which of the following statement is true?
a. The resonance effect of the hydroxyl group stabiizes the anionic intermediate.
b. The resonance effect of the hydroxyl group stabilizes the cationic
c. The inductive effect of the hydroxyl group stabiizes the cationic intermediate
d. The inductive effect of the hydroxyl group stabiizes the anionic intermediate
Answer:
a. The resonance effect of the hydroxyl group stabilizes the anionic intermediate
Explanation:
The resonance effect stabilizes the the charge through the delocalization of the pi bonds. The resonance stabilization mainly occurs in the conjugated pi systems.
For example, phenol forms a strong hydrogen bonds than the nonaromatic alcohols as the [tex]$O_2-H_2$[/tex] dipole present in the hydroxyl group is being stabilized by the presence of the aromatic ring of phenol.
Thus the resonance effect of the hydroxyl group stabilizes the anionic intermediate.
Chemical bond stretching frequencies depend on two major factors, namely atomic weight and bond stiffness. The frequency absorbed is directly proportional to the bond strength (stiffness) but inversely proportional to the atomic weight. Which of the following bonds will give the highest absorption frequency value?
A. C single bond C.
B. C double bond C.
C. All would be the same frequency.
D. C triple bond C.
Answer:
D. C triple bond C.
Explanation:
The absorption frequency value is highest for carbon-carbon triple bond. The stretching frequencies are much higher than the bending frequency. It mainly depends upon the strength of the bonds as well as masses of the bonded atoms.
The triple bonds have higher stretching strength than the double bonds and double bonds have higher strength than single carbon to carbon bonds.
The triple bonds has a higher bond order, i.e. 3. So it has maximum stretching bonds.
Cual es la formula universal de
Zn - Zn +2
2 Ag - 2
2 Ag
se oxida y cual se reduce
A silver bar with a specific heat of 0.235J/gºC has a mass of 250.g and is heated from 22.0°C to 68.5°C. How much heat will the silver bar absorb?
Answer:
2731.875 J
Explanation:
Applying
Q = cm(t₂-t₁)................ Equation 1
Where Q = amount of heat, c = specific heat capacity of silver, m = mass of silver, t₂ = Final temperature of silver, t₁ = Initial temperature of silver
From the question,
Given: c = 0.235 J/g°C, m = 250 g, t₁ = 22.0°C, t₂ = 68.5°C
Substitute these values into equation 1
Q = 0.235×250(68.5-22.0)
Q = 58.75(46.5)
Q = 2731.875 J