Answer:
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\dfrac{V}{Q} } + k \Big) t \Big ] }[/tex]
Explanation:
The equation that describes the concentration of the radon in the basement with time Ct is;
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\theta} + k \Big) t \Big ] }[/tex]
where;
[tex]C_o[/tex] = concentration of the radon
[tex]C _ {Out}[/tex] = allowable radon concentration
k = decay rate constant
= theoretical detention
t = time needed to lower the radon concentration
The theoretical detention [tex]\theta =\dfrac{V}{Q}[/tex]
∴
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\dfrac{V}{Q} } + k \Big) t \Big ] }[/tex]
Sam is pushing a large rock over the ground. ALL BUT ONE of the following terms relates to the movement of the rock. What term is it? A) force B) friction C) mass D) size
Answer:
C) Mass
Explanation:
What happens to the reaction rate as a reactant gets used up?
A. The rate varies,
B. The rate goes down,
O c. The rate goes up.
D. The rate stays constant.
Answer: B. The rate goes down
Explanation:
2-81) When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO2 (carbon dioxide), which is the principal gas causing the greenhouse effect and thus global climate change. On average, 0.59 kg of CO2 is produced for each kWh of electricity generated from a power plant that burns natural gas. A typical new household refrigerator uses about 700 kWh of electricity per year. Deter- mine the amount of CO2 production that is due to the refrigerators in a city with 300,000 households.
Answer:
12.39 x 10⁷ kg
Explanation:
A typical new household refrigerator uses about 700 kWh of electricity per year.
No of household = 300000
Total energy used up = 300000 x 700 kWh
= 21 x 10⁷ kWh .
Production of each kWh energy produces .59 kg of CO₂
Production of 21 x 10⁷ kWh energy produces .59 x 21 x 10⁷ kg of CO₂
CO₂ produced = .59 x 21 x 10⁷ kg
= 12.39 x 10⁷ kg
Deposition can occur where wind or running water slows down? true or false
Answer:
The answer is True.
Explanation:
How many moles of O2, form as 80 g of KClO3 are totally consumed?
M(KCIO3)= 122.45 g/mol.
Answer:
0.975 mole of O₂
Explanation:
We'll begin by calculating the number of mole in 80 g of KClO₃. This can be obtained as follow:
Molar mass of KClO₃ = 122.45 g/mol.
Mass of KClO₃ = 80 g
Mole of KClO₃ =?
Mole = mass /Molar mass
Mole of KClO₃ = 80 / 122.45
Mole of KClO₃ = 0.65 mole
Next, we shall write the balanced equation for the reaction. This is illustrated below:
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Finally, we shall determine the number of mole O₂ produced by the decomposition of 80 g (i.e 0.65 mole) of KClO₃. This can be obtained as follow:
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Therefore, 0.65 mole of KClO₃ will decompose to produce = (0.65 × 3)/2 = 0.975 mole of O₂.
Thus, 0.975 mole of O₂ was obtained from the reaction.
A student is building a model of the layers of the Earth. Which material would best represent the crust?
a:grouping of magnetic balls
b:Styrofoam packing pellets
C:Bag of shredded paper
d:Thin layer of plaster
Answer:
d
Explanation:
The material that represents the crust is option d. Thin layer of plaster.
What is the crust and which material should be considered for it?It is the outermost shell of a planet i.e. terrestrial. The crust of the earth should be split into older, thicker continental crust, etc. Also, it is made of solid rocks and minerals. Due to this, the thin plaster layer represents the material for the crust.
Learn more about the earth here: https://brainly.com/question/17365118
Explain the order of dielectric constants for the following pairs of liquids. a) Carbon tetrachloride (2.2), chloroform (4.8) b) Ethanol (24.3) and methanol (32.6) c) Acetone (20.7) and formamide (110.0)
Answer:
See explanation
Explanation:
Let us have it behind our minds that the dielectric constant reveals the degree of polarity of a molecule. This implies that the more polar a molecule is, the greater its dielectric constant.
Chloroform is a polar molecule while carbon tetrachloride is a nonpolar molecule due to its symmetrical nature. Thus Chloroform has a greater degree of polarity and consequently a higher dielectric constant.
Methanol is more polar than ethanol because polarity of the molecule decreases as more CH2s are added to the molecule, that is, polarity of the molecule decreases with increase in the length of the carbon chain. Since methanol is more polar than ethanol, it should have a greater dielectric constant.
Again, the presence of more akyl groups in acetone makes it less polar than formamide. Consequently, formamide has a greater dielectric constant than acetone.
Indicate the electron pair geometry and the molecular geometry for each of the six compounds. Compound Electron pair geometry Molecular geometry CO 2 CO2 linear linear BF 3 BF3 SO 2 SO2 trigonal planar bent SiCl 4 SiCl4 tetrahedral tetrahedral PF 3 PF3 tetrahedral trigonal pyramidal OF 2 OF2 tetrahedral bent
Answer:
CO2
Electron pair geometry- Linear
Molecular geometry- Linear
BF3
Electron pair geometry - Trigonal planar
Molecular geometry- trigonal planar
SO2
Electron geometry - Trigonal planar
Molecular geometry - bent
SiCl4
Electron geometry- tetrahedral
Molecular geometry - tetrahedral
PF3
Electron pair geometry - tetrahedral
Molecular geometry- trigonal pyramidal
OF2
Electron pair geometry- tetrahedral
Molecular geometry- bent
Explanation:
Considering the molecule CO2, there are two regions of electron density in the molecule positioned at an angle of 180 degrees from each other hence the molecule is linear.
For BF3, the three bond pairs are arranged at the corners of a triangle to give a trigonal planar geometry at a bond angle of 120 degrees.
SO2 has two bonding groups and one lone pair giving three regions of electron density and a trigonal planar electron pair geometry. Due to the distortion to geometry caused by the presence of a lone pair, the molecule is bent.
For SiCl4, the four bonding groups are arranged at the corners of a regular tetrahedron hence it is tetrahedral both in electron pair geometry and in molecular geometry.
PF3 molecule has four regions of electron density corresponding to tetrahedral electron pair geometry. The presence of the lone pair leads to a trigonal pyramidal molecular geometry.
For OF2, there are four regions of electron density around the central oxygen atom. Two bond pairs and two lone pairs leads to a tetrahedral electron pair geometry but a bent molecular geometry is observed due to the two lone pairs.
For the reaction between aqueous solutions of acetic acid (CH3COOH) and barium hydroxide, Ba(OH)2, 1. Write the balanced molecular equation.
Answer:
[tex]2CH_3COOH(aq)+Ba(OH)_2(aq)\rightarrow Ba(CH_3COO)_2(aq)+2H_2O(l)[/tex]
Explanation:
When acetic acid solution and barium hydroxide solution react together to give an aqueous solution of barium acetate and water
The balanced chemical reaction will be given by
[tex]2CH_3COOH(aq)+Ba(OH)_2(aq)\rightarrow Ba(CH_3COO)_2(aq)+2H_2O(l)[/tex]
If 1 teaspoons of vinegar are equivalent in 60 drops. How many drops of vinegar are there in
1 ½ teaspoons?
Answer:
90 drops
Explanation:
1 teaspoon = 60 drops
Half a teaspoon = 60 ÷ 2 = 30 drops
1 and a half = 60 + 30 = 90
What is the mass of 5.35 moles of potassium phosphate
Explanation:
given
kpo4 it has molar mass of 39+31+(16*4)=134
m=n*Mm
m=5.35*134
m=716.9
At STP, adding salt to a 200 mL sample of water produces a saturated 1.7 M solution. How many grams of salt (NaCl) must be added to 200 mL to produce this solution?
Answer:
[tex]m_{NaCl}=19.9gNaCl[/tex]
Explanation:
Hello!
In this case, since the formula for the calculation of molarity is:
[tex]M=\frac{n}{V}[/tex]
Whereas we can compute the moles of the solute as shown below, making sure the volume is in liters:
[tex]n=M*V[/tex]
Thus, by plugging in we obtain:
[tex]n=0.200L*1.70mol/L=0.170molNaCl[/tex]
Next, since the molar mass of NaCl is 58.44 g/mol, we obtain the following mass:
[tex]m_{NaCl}=0.170molNaCl*\frac{58.44gNaCl}{1molNaCl}\\\\m_{NaCl}=19.9gNaCl[/tex]
Best regards!
what happens when hydrogen gas is passed over hot ferric oxide plzz help
When hydrogen is passed over hot ferric oxide (FeO) hydrogen reacts with oxygen present in the compound and forms water (H2O) and pure Iron
why do you think coal and petroleum are diffrent
Answer:
those both are fossil fuel but coal is used for electricity,Petroleum is used for bikes
Help ASAP please
Which statement best describes the reaction pathway graph for an exothermic reaction but not an endothermic reaction?
It has a hill in the middle that is the highest point.
It has a valley in the middle that is its lowest point.
The reactants are higher in energy than the products.
The products are higher in energy than the reactants.
Answer: C ) The reactants are higher in energy than the products
Explanation:
The enthalpy that is a state variable that identifies the content of heat. Then the change of enthalpy for the exothermic reactions is negative, meaning that the energy of the products is lower than the energy of the reactants.
help me out pleaseeee
Answer:
Help with what?
Pls answer this ASAP thank you
Answer:
The anwer is not D the anwer is A
Explanation:
What is the solubility of cerium (III) sulfate at 10ºC?
Select the BEST definition for entropy. Select one: a. stored energy in a substance that is exchanged as heat during a reaction (at constant pressure). b. tendency for a substance to achieve maximum disorder (i.e., randomly distribute). c. state of balance between a forward and a reverse reaction. d. ability of an atom to attract electrons for bonding.
Answer:
b. tendency for a substance to achieve maximum disorder (i.e., randomly distribute).
Explanation:
Entropy can be defined as the tendency for a substance to achieve maximum disorder (i.e., randomly distribute).
This ultimately implies that, entropy is a thermodynamic quantity that measures the degree of maximum order or randomness of a system.
The S.I unit used for the measurement of the degree of maximum order or randomness of a system is Joules per Kelvin (JK¯¹). An example of entropy is the mixing of ideal gases.
Will give brainliest to correct answer of this picture:
Answer:
option C : cellular respiration
Explanation:
cellular respiration is taking place in this diagram .
as in respiration food get oxidised to release energy and it releases CO2 and water
Examine the diagram of the cell cycle.
Which label identifies the stage in which the DNA is copied and the cell grows?
A-W
B-X
C-Y
D-Z
Explanation:
i think w is the required answer
Hello,can you guys please write me an explanation on the question below, the best answer will get brainliest
Answer:
I just umm
Explanation:
What is the difference between a proton, neutron, and electron?
Answer:
proton :
a particale or atom containing a postive charge
nuutron
a particale or atom that contains a negative charge
electron :
a particale or atom with a negative chrage.
Explanation:
proton:
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
nuetron:
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
elcetron:
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
1. A chemical reaction where reactants exchange places in the product. *
(10 Points)
Synthesis
Decomposition
Replacement
Answer:
Replacement is your answer
What happens when a new star contracts?
Answer:
The outer shell of the new star will start to expand.
Explanation:
The new star will continue to glow for millions or even billions of years. As it glows, hydrogen is converted into helium in the core by nuclear fusion. The core starts to become unstable and it starts to contract. The outer shell of the star, which is still mostly hydrogen, starts to expand.
Explanation provided by:
StarChild: Stars - NASA
How does the appearance of a substance change when it
changes phase?
Answer:
Melting: the substance changes back from the solid to the liquid. Condensation: the substance changes from a gas to a liquid. Vaporization: the substance changes from a liquid to a gas. Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase.
Explanation:
The change in appearance of a substance when it changes its phase includes :
Change in volume Change in texture and Change in shapeChange in volume : when a liquid substance is heated to its boiling point ( vaporization) the volume of the liquid substance will change when it turns into gas because gases have no definite volume or shape.
Change in Texture: When water freezes it changes its state from a liquid state to a solid state, also the appearance of the liquid water will undergo changes in its texture when it is in its' solid state ( i.e. the texture of ice is not exactly the texture of liquid water )
Change in shape : when a solid substance changes its state from solid to gas ( sublimation ) the shape of the solid substance will be lost during the phase change.
Hence we can conclude that the change in the appearance of a substance when it changes its phase include. Change in volume, Change in texture and Change in shape.
Learn more : https://brainly.com/question/16785581
What type of chemical reaction is this? CH4 + O2 + CO2 + H20 ?
Answer:
combustion reaction. hope this helps!
Geosmin is an aroma compound found in raindrops. It's chemical formula is C12H22O. The molar mass is 182 g/mol. If you perform combustion analysis of 1.77 grams of this compound, how many grams of carbon should be isolated as CO2 during the analysis?
Answer:
5.13 g of CO₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C₁₂H₂₂O + 17O₂ —> 12CO₂ + 11H₂O
Next, we shall determine the mass of C₁₂H₂₂O that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of C₁₂H₂₂O = 182 g/mol.
Mass of C₁₂H₂₂O from the balanced equation = 1 × 182 = 182 g
Molar mass of CO₂ = 12 + (2×16)
= 12 + 32
= 44 g/mol
Mass of CO₂ from the balanced equation = 12 × 44 = 528 g
SUMMARY:
From the balanced equation above,
182 g of C₁₂H₂₂O reacted to produce 528 g of CO₂.
Finally, we shall determine the mass of CO₂ produced from the reaction. This can be obtained as follow:
From the balanced equation above,
182 g of C₁₂H₂₂O reacted to produce 528 g of CO₂.
Therefore, 1.77 g of C₁₂H₂₂O will react to produce = (1.77 × 528)/182 = 5.13 g of CO₂.
Thus, 5.13 g of CO₂ were obtained from the reaction.
Why do we see this star pattern in the winter, but not at other times of the year? (2 points)
Answer: We see constellations at different times of the year - spring, summer, fall, & winter. This occurs because the Earth is orbiting the Sun.
Explanation:
A sample equal to the atomic mass of an element in grams contains ________ atoms. This amount of matter is called _________ .
Explanation:
The mole (abbreviated mol) is the SI measure of quantity of a “chemical entity,” such as atoms, electrons, or protons. It is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12.
Hope this Helped :)