Answer:
Gully
Explanation:
How do American cities now protect their water resources
Answer:
They can use man made materials or they can also have designed areas that people can’t go into
Explanation:
10) Intravenous saline solutions have a concentration of 1.5 M NaCl. How many liters of saline can be prepared from 50.0 g of NaCl?
Answer:
0.57 mol/L
Explanation:
Molarity (M) is defined as the number of moles of solute per liter of solution (moles/Liter).
Molarity = [tex]\frac{moles of solute}{liters of solution}[/tex] or Moles = molarity × litres
so, the mass of Nacl in 1 mol is 58.44 g,
Moles of NaCl = 50.0g x 1 mole NaCl / 58.44 g
= 0.855 mol NaCl
Moles = molarity × litres
0.855 = 1.5 M x L
L = 0.57 mol/L
Hence, 0.57 mol/L can be prepared from 50.0 g of NaCl.
What are many earthquakes intended to do?
Answer:
rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse and cause heavy items to fall, resulting in injuries and property damage.
Explanation:
Answer:
They tend to cause mass destruction, even destroy lots of building. I hope this helps you out.
Explanation:
A gas has a volume of 3.25 liters at 54 C and 231 kPa of pressure. At what temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa?
Answer: 318 K
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 231 kPa
[tex]P_2[/tex] = final pressure of gas = 168 kPa
[tex]V_1[/tex] = initial volume of gas = 3.25 L
[tex]V_2[/tex] = final volume of gas = 4.35 L
[tex]T_1[/tex] = initial temperature of gas = [tex]54^oC=273+54=327K[/tex]
[tex]T_2[/tex] = final temperature of gas = ?
Now put all the given values in the above equation, we get:
[tex]\frac{231\times 3.25}{327}=\frac{168\times 4.35}{T_2}[/tex]
[tex]T_2=318K[/tex]
At 318 K of temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa
What is the Big bang Theory
Answer:
The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.
Explanation:
please help me please
Answer:
b
Explanation:
i read this once and remember,trust me!
Answer:
20 is b and 21 is a.
Consider the intermediate chemical reactions.
2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one half upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s). Delta H 1 equals negative 812.8 kilojoules. Second: 2 upper C a (s) plus upper O subscript 2 (g) right arrow 2 upper C a upper O (s). Delta H 2 equals negative 1, 269 kilojoules.
The final overall chemical equation is Upper Ca upper O (s) plus upper C upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s).. When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Let's consider the following intermediate chemical reactions.
Reaction 1: Ca(s) + CO₂(g) + ½O₂(g) → CaCO₃(s) ΔH₁ = -812.8 kJ
Reaction 2: 2 Ca(s) + O₂(g) → 2 CaO(s) ΔH₂ = -1269 kJ
We want to calculate the enthalpy of the following overall chemical equation.
CaO(s) + CO₂(g) → CaCO₃(s) ΔH = ?
We can apply Hess' law.
What is Hess' law?Hess' law states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
To apply Hess' law in this case we have to:
Conserve equation 1 as is.Reverse equation 2 and multiply it by 1/2, thus changing the sign of its enthalpy and multiplying it by 1/2.Add both equations and their enthalpies.Ca(s) + CO₂(g) + ½ O₂(g) → CaCO₃(s) ΔH = -812.8 kJ
+
CaO(s) → Ca(s) + ½ O₂(g) ΔH = 634.5 kJ
--------------------------------------------------------------------------------------
CaO(s) + CO₂(g) → CaCO₃(s) ΔH = -178.3 kJ
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
The complete question is as follows.
Consider the intermediate chemical reactions.
Ca (s) + CO₂ (g) + ½O₂ (g) → CaCO₃ (s) ΔH₁ = -812.8 kJ
2Ca (s) + O₂ (g) → 2CaO (s) ΔH₂ = -1269 kJ
The final overall chemical equation is
CaO (s) + CO₂ (g) → CaCO₃ (s) ΔH = ?
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation
is halved and has its sign changed. is halved. has its sign changed. is unchanged.Learn more about Hess' law here: https://brainly.com/question/11628413
Answer:
Consider the following intermediate reactions.
CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(g) ΔH₁ = -802 kJ
2H₂O(g)⇒2H₂O(I) ΔH₁ = - 88 kJ
The overall chemical reaction is as follows.
CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(I) ΔH₂ = -890 kJ
What is the correct enthalpy diagram using the Hess law for this system?
✔️ A←❌ B
❌ C
❌ D
What is the charge on an electron?
Answer:
The answer is negative .
5. What is the % of each element in Al2(Cro4)3?
Explanation:
Utiliza mayúsculas para el primer carácter en el elemento y minúsculas para el segundo carácter. Ejemplos: Fe, Au, Co, Br, C, O, N, F.
Puedes utilizar los paréntesis () o los corchetes [].
5) A solution has a pH of 1.5. What is the [H+]? *
0.0316
0.0679
0.00123
0.000954
Answer:
.0316
Explanation:
The formula is...
H+ = 10^-pH
- Hope that helps! Please let me know if you need further explanation.
Which has more total Heat Energy/
A.) A cup of HOT coffee
B.) A thermos of HOT coffee
C.) They both have the same amount to heat energy
Answer:
The thermos should have more heat energy because of the greater mass.
Identify three details for how the Earth and Moon are different
if the element xenon applied for a job, what job would it apply for
Answer:
A photographer.
Explanation:
Xenon is used in photographic flashes.
Chemical reactions will occur if_____.
- the mass of the products is greater than the reactants
- the products are more stable than the reactants
- the products are the same stability as the reactants
- the products are less stable than the reactants
Answer:
the products are more stable than the reactants
Explanation:
PLS HELP
In the balanced equation:
H3PO4(aq) + NH3(aq) ↔ X(aq) + NH4+(aq)
The particle represented by X(aq) is
A) H2PO4–(aq)
B) HPO42–(aq)
C) PO43–(aq)
D) H3PO4(aq)
Answer:
The particle represented by X(aq) is A) H₂PO₄⁻(aq)
Explanation:
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution. Conversely, a substance acts as an acid if it acts as a proton donor.
A proton transfer then occurs, requiring the presence of a proton donor (an acid) and a base that accepts them.
When an acid gives up a proton, it becomes an anion, generating a conjugate base. That is, a conjugate base is an ion or molecule resulting from the acid that loses the proton. Conversely, a conjugated acid is an ion or molecule resulting from the base that the proton gains.
In this NH₃ / NH₄⁺ pair that NH₄⁺ is the conjugate acid of the NH₃ base, the latter acting as a base since it accepts a proton. H₃PO₄ then acts as an acid, yielding a proton and generating the conjugate base H₂PO₄⁻.
So, the particle represented by X(aq) is A) H₂PO₄⁻(aq)
Cylinder A contains a gas whose molecules have an average speed of 0.0000001 meters/sec. Cylinder B contains a gas whose molecules have an average speed of 0.3 meters/sec. Select the statement below that is true regarding these cylinders. options: Cylinder A contains a gas that has a temperature closest to absolute zero. Even though the molecules are moving at different speeds in the two cylinders, they have the same kinetic energy. Cylinder B contains molecules that are moving more slowly than the molecules in Cylinder A. Cylinder B contains a gas that has a temperature closest to absolute zero.
Answer:
The correct option is;
Cylinder A contains a gas that has a temperature closest to absolute zero
Explanation:
From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;
[tex]v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }[/tex]
Where:
[tex]v_{rms}[/tex] = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero
R = Universal gas constant = 8.3145 J/(mol·K)
MW = Molecular weight of the gas
Hence where we have;
[tex]v_{rmsA}[/tex] = Average velocity of gas A = 0.0000001 m/s
[tex]v_{rmsB}[/tex] = Average velocity of gas B = 0.3 m/s
Since, R and MW are constant for the gas in cylinder A constant, therefore, as [tex]v_{rmsA}[/tex] ≈ 0 m/s, the temperature, [tex]T_A[/tex], of gas A is closest to absolute zero.
Which of the following are social implications of an environmental policy? Check all that apply.
loss of jobs
poorer air quality
less erosion
cleaner water waste
higher taxes
elimination of tourist activities
Answer:
the correct answer is lost of jobs,higher taxes, and elimination of tourist activities
Explanation:
hope you have a blessed day:)
Answer:
the correct answer is lost of jobs,higher taxes, and elimination of tourist activities
Explanation:
thank you for the answer i hope EVERYONE has A BLESSED DAY!!!!!!!!!!!!!!!!!!!!!!
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water.
Answer:
4/5 of a bottle
Explanation:
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water. Which equation represents how much of a bottle of water Sarah took?
Sarah must have taken 4/5 of a bottle
First, the 4 bottles of water were divided into 5 equal portions;
4 x 5 = 20 portions.
Sara too 1 portion from each bottle;
1 portion x 4 bottles = 4 portions
Which equation represents how much of a bottle water Sarah took?
Since each bottle water was divided into 5 equal proportions and assuming that the bottle waters are of the same volumes, then Sarah has taken 4 out of 5 portions of a bottle water.
Answer: 4 ÷ 5 ﹦4/5 ♡♡♡
Explanation: When you see eqautions like these, always remember that the first number goes on the top and the second one goes on the bottom. Hope this helps! (～﹃～)~Hi☆
Look at these two molecular diagrams and think about the features of the compounds. (SEE PICTURE)
1. A chain of 5 C atoms is bonded to H above and below and to the left and the right, except that the 4th C is bonded to C H subscript 3 above instead of a plain H. 2. A chain of 4 C atoms is bonded to H above and below and to the left and the right, except the second C in the chain is bonded to C H subscript 3 above and below.
Which descriptions apply to these two compounds? Check all that apply.
are isomers of each other
have same molecular formula
have same structural formula
are both hydrocarbons
have same number of each kind of atom
have same geometric arrangement of atoms
Answer:
A, B, D, E
Explanation:
correct on Edge 2020
Answer:
1) are isomers of each other
2) are isomers of each other
4) are both hydrocarbons
5) have same number of each kind of atom
Explanation: edg 2020
Help Chem asap!!!!! Brainslist
Answer:
OH-
Explanation:
State duplet rule .
The ___________________ is an early theory which states that our solar system was formed by the gravitational collapse of a massive giant cloud.
A) Nebular Theory
B) Capture Theory
C) Proto-planet Theory
D) Schmidt-Lyttleton accretion theory
Answer: A) Nebular Theory
Explanation:
Answer:
A)
Explanation:
You arrive in my class 45 seconds after leaving math which is 90 meters away. How fast did you travel?
Answer:
Speed is 2
Explanation:
Speed = distance ÷ time
90/45=2
Answer: 2
Explanation:
Distance/Time = Speed
Discribe how an internal combustion engine works. What is drawback to the type of power?
Answer:
An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.
Explanation:
How many mL of 0.5 M H2SO4 will neutralize 10 mL of 1.5 M NaOH?
0.75mL
30 mL
3 mL
15 mL
Answer:
15 mL
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
Consider the nuclear equation below. Superscript 222 subscript 86 upper R n right arrow superscript 218 subscript question mark upper P o plus superscript 4 subscript 2 upper H e. Which is the missing value that will balance the equation? 84 86 88 90
Answer:
84
Explanation:
From the question given above, it is evident that 222 86Rn is emitting alpha particle since the daughter nuclei produced has a mass number lesser than 4 when compared to parent element.
Therefore, the miss value in the equation is 84.
Please see attachment for further details
Based on the calculations, the missing value that will balance the equation is: A. 84.
What is an alpha decay?An alpha decay is a type of nuclear reaction in which the atomic nucleus of a radioactive element emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.
In this exercise, we are given the following nuclear equation with an alpha decay:
²²²R₈₆ -----> ²¹⁸Poₓ + ⁴He₂
For the subscript, we have:
86 - 2 = 84.
Read more on alpha decay here: brainly.com/question/23303931
#SPJ2
How is the molar mass of an element different from the atomic mass of an element?
Please help No Explanation needed. Its science please
Answer:
C, A, A, B, B
Explanation:
Question 5: C. continental drift
Question 6: A. new rock forms
Question 7: A. happens at deep-ocean trenches
Question 8: B. convection currents in the mantle
Question 9: B. convergent boundary
How is the atmospheric oxygen that is taken in by living things for respiration replaced?
A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.
B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
C) Weathering releases oxygen that is locked in rocks due to sedimentation.
D) Oxygen that is dissolved in water such as oceans is released.
Answer:
B.) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
Explanation:
What happens to a neutral atom when an electron leaves
