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.
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
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
the half life for strontium-90 is 29 years. how many half-lives did the sample go through at the end of 87 year
= 87 : 29
= 3 half lives
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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I need this table filled out. 'in this project, you will create models of various atomic nuclei and how they change during radioactive
decay, fission, or fusion. first, you will complete a table that summarizes how the structure of the nuclei
changes during each of these processes. this will help you plan your models.
The model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.
What is radioactive decay?Radioactive decay is a process in radioactivity in which the nucleus of atoms spontaneously breakdown or decay to produce smaller atomic nucleus with the emission of radiation.
Nuclear fusion involves the merging together of the nucleus of two or more smaller atoms to produce a larger atom whereas nuclear fission is the splitting of the nucleus of larger atoms into smaller atomic nuclei.
Therefore, the model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.
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Answer:
This is for the table
Explanation:
Sorry for my handwriting
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.
::: (\_(\ Hope
*: (=' :') this
•.. (,('')('') helped :)
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 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.
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 ExosphereConvert 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]
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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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 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
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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PLEASE HELP ASAP
Calculate the enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions. K+S → KSAH = +32.5 kJ KS + K + KS AH = +38.2 kJ
The enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions is mathematically given as
dn=70.7kg
What is the enthalpy change for the reaction?Generally, the equation for the Chemical reaction is mathematically given as
2k+s----->K2S
Therefore
KS+K----->K2S
Therefore
dn=dn1+dn2
dn=32.5+38.2
dn=70.7kg
In conclusion, the enthalpy change is
dn=70.7kg
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What is the change in entropy of 250 g of steam at 100 ∘c when it is condensed to water at 100 ∘c?
Entropy change is the randomness of the thermodynamic system. The change in the entropy when the water is condensed is 1573 J/K.
What is the entropy change?An entropy change is a product of mass and the ratio of the enthalpy of vaporization to the temperature.
Given,
Enthalpy of vapourization = 2257 J/gK
The temperature in kelvin = 373 k
The change in entropy is calculated as:
[tex]\begin{aligned} \rm \Delta S &= \rm m (\dfrac{\Delta H_{vap}}{T})\\\\&= 260 (\dfrac{2257}{373})\\\\&= 1573.24\;\rm J/K\end{aligned}[/tex]
Therefore, the change in entropy is 1574 J/K.
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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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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
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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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]
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
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
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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Where dose the energy that drives the rock cycle come from
Answer:
It comes from the sun.
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 :)
The equation that describes the change in temperature of a solvent due to a solute is AT6 = i xKb x molality. How much salt would one need to add to 1 kg water to change the boiling temperature
by 5°C? Give your answer in moles. Show your work. (Kb =
0.51°Cfor water and i = 2 for NaCl.
4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature
by 5°C.
What is the moles of Salt required to change the temperature of water by 5°C?Based on the given equation, the molality of the solution is calculated as follows:
Molality = change in temperature/ Kb × IChange in temperature = 5 °C
Kb = 0.51
i = 2
Molality = 5/0.51 × 2 = 4.9 molal
Also, Molality = moles/kg of water
Moles of salt = molality × kg of water
Moles of salt = 4.9 × 1 = 4.9 moles.
Therefore, 4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature
by 5°C.
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A student placed a glass slide containing a small piece of onion under the lens of a microscope. The image shows the view seen in the microscope at a magnification of 30X
The total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.
What is 30X magnification?The 30X magnification does not exist, nowadays the current objective lens comes in 20X, and 40X.
Using this magnification, we might see plant cells that divide to produce cell walls between daughter cells after a process called mitosis.
In conclusion, the total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.
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. 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.
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
