What is the molarity of a solution if 1.75 moles of KOH are dissolved in 2.5 liters of water?
Answer: 0.7 M
Explanation:
molarity = (moles of solute)/(liters of solution) = 1.75/2.5 = 0.7 M
What statement describes an electrolyte?
Coltan is a kind of mineral and is a resource. lumber extracted from forests is a resource. electricity generated from coal and oil comes from resources. electricity generated from wind or solar power comes from resources.
Coltan, lumber and fossil fuels are all part of the resources that exists in the environment.
What are resources?The term resources refer to those materials that we extract from the environment that can be used or our good. These resources could include minerals or energy raw materials.
However, coltan, lumber and fossil fuels are all part of the resources that exists in the environment.
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Answer B A B A
Explanation:
i got it right
HELP HELP HELP HELP
Answer(s):
Template: reactants ⇒ products
1. [tex]Ag+KNO_3[/tex] ⇒ [tex]AgNO_3 + K[/tex]
2. [tex]Zn+AgNO_3[/tex] ⇒ [tex]Zn(NO_3)_2 + Ag[/tex]
3. [tex]Al + H_2SO_4[/tex] ⇒ [tex]Al_2(SO_4)_3 + H_2[/tex]
4. [tex]Cl_2+KI[/tex] ⇒ [tex]HCl + I_2[/tex]
5. [tex]Li + H_2O[/tex] ⇒ [tex]LiOH + H_2[/tex]
6. [tex]Cu + FeSO_4[/tex] ⇒ [tex]CuSO_4 + Fe[/tex]
7. [tex]Na + H_2O[/tex] ⇒ [tex]NaOH + H_2[/tex]
8. [tex]Fe+Pb(NO_3)_2[/tex] ⇒ [tex]Fe(NO_3)_2 + Pb[/tex]
9. [tex]Cu+H_2O[/tex] ⇒ [tex]CuO + H_2[/tex]
10. [tex]Cu+Al_2(SO_4)_3[/tex] ⇒ [tex]CuSO_4 + Al[/tex]
11. [tex]Al + Pb(NO_3)_2[/tex] ⇒ [tex]Al(NO_3)_3 + Pb[/tex]
What is a chemical equation?
A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). Each individual substance's chemical formula is separated from others by a plus sign.
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•.. (,('')('') helped :)
. How many ethyl groups are in the molecule 3, 3-diethylpentane?
O 1 groups
O 3 groups
O 4 groups
O2 groups
Answer:
2 groups
Explanation:
The molecule 3, 3-diethylpentane has 2 ethyl groups because the prefix di- means that there are 2 homogeneous substituent groups present in the molecule.
Consider the balanced chemical reaction below. when the reaction was carried out, the calculated theoretical yield for iron was 365 grams, but the measurement yield was 278 grams. What is the percent yield?
Fe2O3 + 3CO —> 2Fe + 3CO2
Answer:
≈ 76.16%
Explanation:
What is Percent Yield? In chemistry, percent yield is the percent ratio of the weight of the product obtained to the theoretical yield. We calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %.
[tex]\frac{actual}{theoretical} (100)=percentyield[/tex] ⇒ [tex]\frac{278}{365} (100)=76.1643835616[/tex]
≈ 76.16%
hope this helped :)
Answer:
76.16%
Explanation:
I know answer is correct because I got the exact same question :)
police said that there were 5000 grams of H2 in the room. Convert grams of hydrogen into grams of water and see if the was enough.
When we convert 5000 grams of hydrogen into water, the mass of the water obtained is 45000 g
Balanced equation2H₂ + O₂ —> 2H₂O
Molar mass of H₂ = 2 g/mol
Mass of H₂ from the balanced equation = 2 × 2 = 4 g
Molar mass of H₂O = 18 g/mol
Mass of H₂O from the balanced equation = 2 × 18 = 36 g
SUMMARY
From the balanced equation above,
4 g of H₂ reacted to produce 36 g of H₂O
How to determine the mass of water producedFrom the balanced equation above,
4 g of H₂ reacted to produce 36 g of H₂O
Therefore,
5000 g of H₂ will react to produce = (5000 × 36) / 4 = 45000 g of H₂O
Thus, 5000 g of H₂ is equivalent to 45000 g of H₂O
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Chemical equation reaction between h2co3 and ba(oh)2
The chemical equation between Ba(OH)2 and H2CO3 is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2 H₂O.
What is a balanced equation?A balanced equation has the reactants are on the left side of the arrow, whereas the products are on the right.
The number in front of a chemical formula denotes the number of moles in a compound. The number of atoms in a single molecule is indicated by subscripts (numbers below an atom).
Thus, the chemical equation is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2H₂O.
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What is the correct order of the atmospheric layers from bottom to top
The correct order of the atmospheric layers from bottom to top are
The lowest layer that is the TroposphereThe layer right above the troposphere is the StratosphereThe layer above the Stratosphere is the MesosphereThe layer above the Mesosphere is the ThermosphereThe topmost layer that continues till it merges with space is the ExosphereLas Vegas is a city in the middle of the Mojave Desert. In 1933, the Hoover Dam was built creating Lake Mead, a large water reservoir to the east of Las Vegas. Select all the options that were the primary reason for creating this reservoir.
options:
People needed a place for recreational use of the lake for swimming and boating.
Population was continuing to grow since settlement in the Las Vegas area.
The natural springs were in danger of drying up due to over pumping of the aquifer beneath Las Vegas.
To increase city revenue by encouraging people to come see Hoover Dam, the largest dam in the United States.
Answer:
Natural Springs answer.
Explanation:
Actually valid reason for why the dam was built
Select the mass of naoh that is necessary to neutralize 8. 90 mol hcl(aq)
The mass of NaOH that is necessary to neutralize 8.90 mol of HCl is 356 grams.
How we convert moles into mass?Mass of any substance will be calculated from moles by using the below equation as:
n = W/M, where
W = required mass
M = molar mass
Neutralization reaction will be:
NaOH + HCl → NaCl + H₂O
From the stoichiometry it is clear that 1 mole of NaOH is required to neutralize 1 mole of HCl, so that 8.90 moles of NaOH is needed.
Mass of 8.9 moles of NaOH = (8.9mol)(40g/mol) = 356g
Hence required mass of NaOH is 356 grams.
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Calculate the molar mass of sugar
Let's see
[tex]\\ \rm\Rrightarrow C_{12}H_{22}O_{11}[/tex]
[tex]\\ \rm\Rrightarrow 12(12)+22(1)+11(16)[/tex]
[tex]\\ \rm\Rrightarrow 144+22+176[/tex]
[tex]\\ \rm\Rrightarrow 166+176[/tex]
[tex]\\ \rm\Rrightarrow 342g/mol[/tex]
What are the main problems associated with nuclear electricity generation?
Check all that apply.
The disposal of radioactive waste.
Is the most expensive source of energy.
The danger of a nuclear accident.
Nuclear electricity generation requires a lot of fuel.
None to above.
Answer: The disposal of radioactive waste.
Is the most expensive source of energy.
Nuclear electricity generation requires a lot of fuel.
Explanation: This are the main problems of Nuclear Electricity Generation.
According to science what can we say about elements
Answer:
Elements were formed from a supernova in space that was so powerful, it gave us almost all the elements we have today.
Which of the following is an example of a
physical change?
Paper burning
Fireworks exploding
Bread rotting
Dissolving sugar in water
Digesting food
Answer:
firer burning I'm thinking
What volume of a 14.0 M solution of sulfurous acid is required to make 175 mL of a 0.750 M solution? Round your answer to two decimal places.
9.38ml of a 14.0 M solution of sulfurous acid is required to make 175 mL of a 0.750 M solution.
What is Molarity ?
Molarity (M) is the amount of a substance in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution.
Molarity is also known as the molar concentration of a solution.
The units of molarity are M or mol/L.
M = moles solute / liters solution
We know that
M₁V₁ = M₂V₂
It is given that M₁ = 14 M
V₁ = ?
M₂= 0.75 M
V₂= 175 ml
so
14 * V₁ = 0.75 * 175
V₁ = 9.38 ml.
Therefore 9.38ml of a 14.0 M solution of sulfurous acid is required to make 175 mL of a 0.750 M solution.
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How many moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100.0 degrees Celsius?
**I NEED ANSWERS STEP BY STEP PLEASE**
1.137448506 mol moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100.0 degrees Celsius.
What is an ideal gas equation?The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa). V = volume, in [tex]m^3[/tex].
We apply the formula of the ideal gases, we clear n (number of moles); we use the ideal gas constant R = 0.082 l atm / K mol:
PV= nRT
Given data:
P=100.0 kPa =0.986923 atm
T=100 degree celcius= 100 + 273 =373 K
V=35.5 L
Substituting the values in the equation.
n= [tex]\frac{\;0,98 \;atm \;X \;35,5 \;L }{\;0,082\;atm / \;K mol \;X \;373 K}[/tex]
n= 1.137448506 mol
Hence, 1.137448506 mol moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100.0 degrees Celsius.
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What is the molar solubility of aucl3 (ksp = 3. 2 x 10-23) in a 0. 013 m solution of magnesium chloride (a soluble salt)?
The molar solubility of AuCl₃ in a 0.013 M solution of magnesium chloride is 1.81×10⁻²⁸M.
What is Ksp?The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution. And for the AuCl₃, Ksp will be written as: Ksp = [Au³⁺][Cl⁻]³
Let the solubility of the AuCl₃ in 0.013M solution of magnesium chloride is x, of Au³⁺ is x and of Cl⁻ is 3x. But we know that MgCl₂ is a strong electrolyte and it completely dissociates into its ions and will produce 2 moles of chloride ions. For this solution let we consider the volume is 1 liter then the concentration of chloride ions in MgCl₂ is 2(0.013)=0.026M.
So, in MgCl₂ solution concentration of Cl⁻ becomes = 3x + 0.026.
Value of Ksp for AuCl₃ = 3.2 × 10⁻²³
On putting all values on the Ksp equation, we get
Ksp = (x)(3x + 0.026)³
Value of 3x is negligible as compared to the 0.026, so the equation becomes
3.2 × 10⁻²³ = (x)(0.026)³
x = 3.2×10⁻²³ / (0.026)³
x = 1.81×10⁻²⁸M
Hence the molar solubility of AuCl₃ in 0.010M MgCl₂ is 1.81×10⁻²⁸M.
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Which two changes would increase the density of ocean water?
A. increasing the amount of light that enters it
B. decreasing its temperature
C. Decreasing its salinity
D. increasing the amount of water that evaporates from it
REMEMBER 2 answers
Convert 1.81×1024 atoms of carbon to moles of carbon.
Answer:
3 mol
Explanation:
[tex] \frac{1.81 \times 10 {}^{24} \times C \times atoms}{6.022 \times {10}^{23}\times C \times atoms \times mol {}^{ - 1} } = 3 \: \: mol \\ [/tex]
ANYONE PLEASE HELP BY THURSDAY!!
Bodies of water, such as ponds, freeze from top to bottom, forming a floating sheet of ice. This can help aquatic organisms survive during cold winter months. Which of the following statements explains why the ice floats on the
Surface of the pond?
A- the ice molecules have higher kinetic energy then the liquid molecules, causing them to float
B- the crystalline structure of solid ice makes it less dense than liquid water
C- as water freezes ionic bonds form between water molecules preventing the ice from sinking below the surface
Answer:
c
Explanation:
i dont have one
Which characteristic can be inherited?
long toes
acting ability
sense of humor
short temper
Answer:
long toes
Explanation:
the other traits are personality related, not a biological factor. they can be learned, but not inherited
A laser with a power output of 2. 15 mw at a wavelength of 413 nm is projected onto calcium metal
Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex]. The power carried by the electrons is 0.255 mW.
What is a laser?
A laser is a light-emitting device that enables the process of optical amplification to deduce electromagnetic radiations.
The given laser has a power output of 2.15 mW and a wavelength is 413 nm.
The energy of each photon emitted is given as:
[tex]E=h\nu=\dfrac{hc}{\lambda}=\rm \dfrac{(6.63 \;\times\; 10^{-34} m^2 kg s^{-1}) \;\times (3.0 \;\times\; 10^8 m s^{-1})}{413 \;\times\; 10^{-9} m}=4.81 \;\times\;10^{-19}[/tex]
The number of photons ejected at 2.15 mW is given as:
[tex]\rm \dfrac{2.15\;\times\;10^-^3\; J}{4.81\;\times\;10^-^1^9J}=4.46\;\times\;10^1^5 \;photons[/tex]
Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex].
With the work function of 2.71 eV, the power carried by the electrons is given as:
[tex]KE_{e}=h\nu-\Phi=\rm 4.81\;\times\;10^{-19} J - 2.71 eV\;\times\; \dfrac{1.60 \;\times 10^{-19} J}{1 eV}=6.34 \;\times 10^{-20}[/tex]
The power carried by all the electrons ejected is given as:
[tex]P_{e}=\rm (4.02\;\times\;10^1^5 s^{-1}) \;\times\; (6.34 \;\times\; 10^{-20} J)=0.255 \;mW[/tex]
The power carried by the electrons is 0.255 mW.
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Why is sea water more dense than tap water? Give than explanation for these differences pleaseeee don’t copy off the internet :( I really need a good answer for this
Answer:
See below ~
Explanation:
Sea water has a high amount of salt present in it. The density of salt is higher than that of water. It dissolves in water, thereby increasing its density. Hence, this is why sea water has a higher density than tap water.
Answer:
sea water have high density and also they're moving from one side to another more than tap water
tap water have less density and also they're not moving ever they ain't move than sea water
The Earth's orbit is a(n) ___shape.
.
Answer:
elliptical/ellipse
Explanation:
» Concepts
Astronomer Johannes Kepler discovered and founded his three laws of planetary motion. One of these laws states that the orbit of all planets, including Earth, is in an elliptical shape rather than a circle.
DRAW THE STRUCTURE (ASAPP)
The structure of 3-ethyl-2 fluroheptane is attached. The chemical formula of the compound is C9H19F.
What is 3-ethyl-2 fluroheptane?It is an organic compound which has one pair of hydrogen and acceptor and zero hydrogen bond donor.
The chemical formula of the compound is [tex]C_9H_1_9_F.[/tex]
Thus, the structure of 3-ethyl-2 fluroheptane is attached. The chemical formula of the compound is C9H19F.
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Use the solubility graph to answer the following questions.
1. How many grams of potassium chlorate (KClO3) are needed to make a saturated solution at 90°C?
2. How many grams of potassium chloride (KCl) can be dissolved in 68.0 g of water at 40°C?
3. 75 grams of calcium chloride is added to 100 g of water at 25°C. Is the solutions unsaturated, saturated, or supersaturated?
4. Based on the graph above, cerium sulfate (Ce2(SO4)3) behaves like a substance that is in what physical state? Explain how you know.
5. 10.0 g of KCl are dissolved at 40°C. How many more grams should be added to make a saturated solution?
The required amount of KClO₃ to prepare a saturated solution is 48 grams.
What is solubility?The ability of a material, the solute, to create a solution with another substance, the solvent, is known as solubility.
Given graph is plotted between the temperature and solubility of the substance at 100g of water, so for the given points calculation will be:
According to the graph for the KClO₃ we require almost 48g of KClO₃ to prepare a saturated solution.From the graph it is clear that at 40°C 40g of KCl will dissolve in 100g of water then amount of KCl which will dissolve in 68g of water will be calculated as:x = (40)(68) / (100) = 27.2g
On the basis of the graph, if 75 grams of calcium chloride is added to 100 g of water at 25°C then the obtained solution is the unsaturated as they have les solute then the limit.Based on the graph cerium sulfate behaves like a precipitate which will not dissolve at any temperature and present in the physical state.We can add more 30g to make the KCl solution saturated.Hence, we require almost 48g of KClO₃ to prepare a saturated solution of KClO₃.
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am i doing this right??? if not how can i change it?!
Answer:
yes you are doing it right my chemistry teacher said said so
For which part of the engineering process would the use of statistics to analyze data about a new drug test be helpful?
A. Making a plan
B. Identifying a need
C. Evaluating the results
D. Testing the solution
C. Evaluating the results.
Explanation:
I hope it'll help you...
Question 5 of 5
A spiral staircase like the one shown can be a model of the
structure of a DNA molecule.
In this model, what do the steps on the staircase represent?
Answer:
A
Explanation:
l took the test
