Answer:
i think it's B, C and D
Explanation:
Nitrogen in a 29 L container at a pressure of 398 mm Hg and 293 K is transferred to a container with a pressure of 307 mm Hg. What is the new temperature if the volume changes to 156 L?
Answer:
70.61°c=T₂
Explanation:
This question is on Combined Gas Laws
The volume of a gas is directly proportional to the absolute temperature and inversely proportional to the pressure.
P₁V₁T₁=P₂V₂T₂
where
P₁=Initial pressure, P₂=final pressure
V₁=Initial volume,V₂=final volume
T₁=Initial temperature in Kevin, T₂=final temperature in Kelvin
Given
P₁=398mm Hg, V₁=29 L and T₁=293 K
P₂=307 mm Hg, V₂=156 L and T₂=?
Solution
P₁V₁T₁=P₂V₂T₂
Substitute values
398×29×293=307×156×T₂
3381806=47892T₂
3381806/47892=T₂
70.61°c=T₂
70.61+273=343.61 K
How many of the following atomic particles does a neutral magnesium
atom have if atomic number is 12, and mass is 24.3050 ?
Protons-
Neutrons-
Electrons-
Answer:
[tex]\boxed{\text{12 p, 12 n, and 12 e}}[/tex]
Explanation:
No atoms of Mg have a mass of 24.3050 u. That is the average mass of all the isotopes of Mg.
However, the most common isotope of Mg is ₁₂²⁴Mg (mass = 23.99 u)
The atomic number of Mg is 12. It has 12 protons.
The atomic mass of ²⁴Mg is 24. That's the total number of protons and neutrons.
p + n = 24
12 + n = 24
n = 12
An atom of ²⁴Mg has 12 neutrons.
If the atom is neutral, the number of electrons equals the number of protons.
e = p = 12
[tex]\text{An atom of }$^{24}$\text{Mg contains }\boxed{\textbf{12 p, 12 n, and 12 e}}[/tex]
Top answer
it seems most correct
ANSWER FIRST GET BRAINLIEST
Which student is practicing heat and fire safety? A. Akari quickly touches a hot plate to see if it is hot yet. B.Clara leans over the open flame on her lab table. C. Aero leaves his plastic water bottle near a hot plate.D. Brenda picks up a hot beaker with insulated gloves.
Answer:
D
Explanation:
Its D because she had insulated gloves.
Answer:
D. Brenda picks up a hot beaker with insulated gloves.
CS2 (s) + 3 O2 (g) → CO2 (g) + 2 SO2 (g)
Using the formula above how many liters of SO2 can be made from 3.1 L of O2 at STP? Round your answer to two decimal places.
Answer:
2.067 L ≅ 2.07 L.
Explanation:
The balanced equation for the mentioned reaction is:CS₂(g) + 3O₂(g) → CO₂(g) + 2SO₂(g),
It is clear that 1.0 mole of CS₂ react with 3.0 mole of O₂ to produce 1.0 mole of CO₂ and 2.0 moles of SO₂.
At STP, 3.6 L of H₂ reacts with (?? L) of oxygen gas:It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.
using cross multiplication:
1.0 mol of O₂ represents → 22.4 L.
??? mol of O₂ represents → 3.1 L.
∴ 3.1 L of O₂ represents = (1.0 mol)(3.1 L)/(22.4 L) = 0.1384 mol.
To find the no. of moles of SO₂ produced from 3.1 liters (0.1384 mol) of hydrogen:Using cross multiplication:
3.0 mol of O₂ produce → 2.0 mol of SO₂, from stichiometry.
0.1384 mol of O₂ produce → ??? mol of SO₂.
∴ The no. of moles of SO₂ = (2.0 mol)(0.1384 mol)/(3.0 mol) = 0.09227 mol.
Again, using cross multiplication:1.0 mol of SO₂ represents → 22.4 L, at STP.
0.09227 mol of SO₂ represents → ??? L.
∴ The no. of liters of SO₂ will be produced = (0.09227 mol)(22.4 L)/(1.0 mol) = 2.067 L ≅ 2.07 L.
How do the conditions for hurricane differ from the conditions for tornado?
Answer:
The conditions for hurricanes differ from the conditions of tornadoes because of D, Tornadoes form over land, while hurricanes form over bodies of water.
Explanation:
Hurricanes form over warm water in tropical ocean settings and tornadoes form over land within storms.
What does the principle of uniformitarianism state
Answer:
Explanation:
Uniformitarianism - "The Present is the Key to the Past"
Uniformitarianism is a geological doctrine. It states that current geologic processes, occurring at the same rates observed today, in the same manner, account for all of Earth's geological features. Thus, it assumes that geological processes are essentially unchanged today from those of the unobservable past, and that there have been no cataclysmic events in earth's history. As present processes are thought to explain all past events, the Uniformitarian slogan is, "the present is the key to the past.
Answer:
I hope this helps! <3
Explanation:
EARN 60 POINTS!
Which statement best explains how cellular respiration helps maintain homeostasis in animals?
A.)It maintains body temperature by absorbing energy.
B.)It breaks glucose into energy required by the organism.
C.)It speeds up metabolism by making oxygen.
D.0It produces energy from hormones present in the organism.
Answer:
I am pretty sure it is D.
Cellular Respiration needs to assist Homeostasis in animals to make it easier for the animal to successfully complete the animals Physiological process. So that would make it D. It Produces energy from hormones present in the organism.
Cellular respiration helps maintain homeostasis in animals by producing energy from hormones present in the organism.
What is homeostasis?Homeostasis is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.
Cellular Respiration to Produce Heat when the body gets too cold, it maintains temperature homeostasis by producing heat to warm itself.
The body can increase its internal temperature by making heat in skeletal muscle cells and brown fat cells.
Hence, cellular respiration helps maintain homeostasis in animals by producing energy from hormones present in the organism.
Hence, option D is correct.
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Sodium chloride, NaCl, is formed when a sodium atom transfers its electron to a chlorine atom. The difference in charge between the two atoms creates a(n) ___________ attraction that bonds them together.
A) electrostatic
B) elementary
C) gravitational
D) nuclear
The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.
It is electrostatic attraction as it bonds the two atoms together.
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
A.It decreases.
B.It increases.
C.It stays the same.
Answer:
B. It increases.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
It is clear that, at constant P, the volume of the gas (V) is directly proportional to the temperature of the gas.
V ∝ T.
So, If a balloon is heated, the volume of the air in the balloon if the pressure is constant:
B. It increases.
How many Milligrams of potassium chloride KCl are required to make a 15 mL of a 1.20 M solution?
Answer:
1340 mg
Explanation:
concentration is the number of moles of solute in a 1000 mL of solution
the concentration of KCl solution is 1.20 M
There are 1.20 mol in 1000 mL of solution
a volume of 1000 mL contains - 1.20 mol
therefore 15 mL solution contains - 1.20 mol / 1000 mL x 15 mL = 0.018 mol
the molar mass of KCl is - 74.5 g/mol
mass of 1 mol is - 74.5 g
therefore mass of 0.018 mol is - 74.5 g/mol x 0.018 mol = 1.34 g
1000 mg - 1 g
therefore 1.34 g in milligrams is - 1.34 g x 1000 mg/g = 1340 mg
Amoeba use _________ to move and ingest prey.
Answer:
pseudopodia
Explanation:
Giant amoebae engulf their prey by gathering of pseudopods around the bacteria, as the bacteria is drawn in, the cell membrane that surrounds it, pinches off to form an inter-cellular compartment called the vacuole.
How is the precision of a calculated result related to the precision of the measurement used in the calculation?
Answer:
The precision of a calculated answer is limited by the least precise measurements used in the calculation.
Explanation:
After chlorofluorocarbons we’re banned, which class of chemicals was used in their place
Hydrofluorocarbons
Methane
Carbon dioxide
Sulfur dioxide
Answer:
Hydrofluorocarbons
Explanation:
Answer:
Hydrofluorocarbons
Explanation:
Earlier chlorofluorocarbons were used for refrigeration purpose. But they were banned as they were primary cause of ozone depletion.
In order to replace chlorofluorocarbons, now hydrofluorocarbons are used which helps to protect earth from stratospheric ozone-depleting substances.
The difference between chlorofluorocarbons and hydrofluorocarbons is of hydrogen. In hydrofluorocarbons one of the halogen is being replaced by hydrogen.
if 45.0 ml of 1.50 M Ca(OH)2 are needed to neutralize 25.0 ml of HI of unknown concentration, what is the molarity of the HI?
Answer:
M of HI = 5.4 M.
Explanation:
We have the rule: at neutralization, the no. of millimoles of acid is equal to the no. of millimoles of the base.(XMV) acid = (XMV) base.
where, X is the no. of (H) or (OH) reproducible in acid or base, respectively.
M is the molarity of the acid or base.
V is the volume of the acid or base.
(XMV) HI = (XMV) Ca(OH)₂.
For HI; X = 1, M = ??? M, V = 25.0 mL.
For Ca(OH)₂, X = 2, M = 1.5 M, V = 45.0 mL.
∴ M of HI = (XMV) Ca(OH)₂ / (XV) HI = (2)(1.5 M)(45.0 mL) / (1)(25.0 mL) = 5.4 M.
Significant Figures For 7.06 × 10^5 ÷ 5.3 × 10^-2
Answer:
[tex]\boxed{\text{two}}[/tex]
Explanation:
In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.
[tex]\dfrac{7.06 \times 10^{5}}{5.3 \times 10^{-2}}= 1.332 075 472 \times 10^{7}[/tex] (by my calculator)
There are three significant figures in 7.06 and two in 2.3.
You must round to [tex]\boxed{\textbf{two}}[/tex] significant figures and report the answer as 1.3 × 1.0⁷.
On dividing the exponents, [tex]\frac{7.06* 10^{5} }{5.3*10^{-2}} = 1.33 * 10^{7}[/tex].
How to divide exponents?To divide them, you take the exponent value in the numerator (the top exponent) and subtract the exponent value of the denominator (the bottom exponent).
[tex]= \frac{7.06* 10^{5} }{5.3*10^{-2}} \\\\= \frac{7.06}{5.3}* 10^{5+2}\\ \\= 1.33 * 10^{7}[/tex]
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how will you prove that a given colourless liquid is an acid
Answer:
Explanation:
One: You could mix a small sample of it with a reactive metal. Underline small. You should see gas bubbles being given up. Usually the bubbles are hydrogen.
Example : K + HCl ===> KCl + H2
Two: You could use an indicator to watch it turn color as it goes from acidic to neutral. Litmus will go from red to blue under these conditions.
Three: Those are the two safest ways. If you knew the acid was dilute, you could put a small (underline small again) amount on your tongue. If it tastes like orange juice, it is likely an acid. This is a test every textbook mentions. You should never do it under any circumstances.
Answer:
1. Using Litmus papers. Litmus paper will turn blue if solution is acidic or it will turn blue if it is basic. ... If pH is below 7 or reddish then the given solution is acidic and if pH is higher than 7 or bluish then the solution is basic.
Explanation:
What is the solute and solvent in an aqueous solution made from sugar and water?
An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl−(aq).
Sugar is the solute and water is the solvent.
What is the solution?A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
Solvent: the substance in which a solute dissolves to produce a homogeneous mixture.
Solute: the substance that dissolves in a solvent to produce a homogeneous mixture.
Hence, sugar is the solute and water is the solvent.
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What is pH level, what are its characteristics, and how does it contribute to pollution?
Answer:
pH Scale:
The pH scale refers to the negative logarithm of molar concentration of hydrogen ions: pH = -log [H+].
Characteristics:
The pH scale ranges from 0 to 14. A solution of a compound of pH 7 or pOH 7 is a neutral solution. Solutions of pH less than 7 are acidic and more than 7 are basic.
Low pH of water is acidic in nature as it enters into the ground and collects in streams, it can have bad impacts on the ecosystem.
Need help !!!!! ASAP
The answer is:
Hence, the new pressure will be 2.07 atm.
[tex]P_{2}=2.07atm[/tex]
Why?Since we know that the gas is inside of a rigid container, meaning that the volume will be kept constant, we can solve the problem using the Gay-Lussac's Law.
The the Gay-Lussac's Law establishes that when an ideal gas is kept at constant volume, the pressure and the temperature will be proportional.
We need to pay special attention when we are working with the Gay-Lussac's Law since its equations with absolute temperatures (Kelvin ), so, if we are working with relative temperatures such as Celsius degrees or Fahrenheit degrees, we need to convert the temperatures to Kelvin (absolute temperature)
We can convert from Celsius degrees to Kelvin using the following formula:
[tex]Temperature(K)=Temperature(C\°)+273[/tex]
Then we have the Gay-Lussac's equation:
[tex]\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}[/tex]
Therefore, we are given the following information:
[tex]T_{1}=30\° \\P_{1}=2atm\\T_{2}=40\°[/tex]
Therefore, converting the given temperatures from Celsius degrees to Kelvin, we have:
[tex]T_{1}=30C\°=30+273K=303K\\\\T_{1}=40C\°=40+273K=313K\\[/tex]
Now, calculating we have:
[tex]\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}[/tex]
[tex]P_{2}=\frac{P_{1}}{T_{1}}*T_{2}\\\\P_{2}=\frac{2atm}{303K}*313K=2.07atm[/tex]
Hence, the new pressure will be 2.07 atm.
[tex]P_{2}=2.07atm[/tex]
Have a nice day!
The website of a popular stargazers club notes that on Wednesday the moon will rise at 6:23 PM and set at 6:12 PM on Thursday. What is a mistake in this information?
A) The moon sets before 6:00 PM everyday
B) The setting time should have been 6:12 AM
C) The moon rises only after 9:00 PM everyday
D) It is difficult to predict when the moon would set
It's C that's correct because it's very true...
Answer:
the answer is B
Explanation:
Which energy position do electrons generally want to be in?
the excited state
the ground state
the highest possible energy level
the medium energy level
Answer: the ground state
Explanation: when electron's are attracted to something, they typically rotate counter clockwise, in theory we can apply this to darwin, i recomend that book btw but counter clockwise goes to ground
Answer:
Ground state is correct
Atoms with an atomic number greater than ____ will undergo fission.
Answer:
26
Explanation:
THIS IS FOR AP EX I SWEAR TO GOD, IT IS NOT 56.
Atoms with an atomic number greater than 92, like U-235 or U-238 and 239Pu, are usually the ones to undergo nuclear fission. Fission involves a large nucleus splitting into smaller parts and often releasing neutrons that can continue the reaction. However, the outcome of the process varies.
Explanation:Atoms with an atomic number greater than 92, such as Uranium-235 or 238 and Plutonium-239, are typically the ones that undergo nuclear fission. Nuclear fission refers to the process of a large nucleus splitting into smaller nuclei, often induced by bombardment with neutrons. When a nucleus such as Uranium-235 (235U) undergoes fission, as in the example of 235U + n, the large U-235 nucleus produces two or three neutrons in the process, each capable of causing fission in another nucleus, which can potentially lead to a nuclear chain reaction.
However, it's important to note that not all atoms with an atomic number greater than 92 will necessarily go through fission. Fission is a statistical process and various products are produced with different probabilities. Therefore, though certain isotopes like 235U and 239Pu are easier to instigate fission in, the outcome can vary.
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How many moles of nitrogen we have at a temperature of 30 ºC, a pressure of 4.0 atm, and a volume of 4000.mL?
Answer:
0.643 mol.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 4.0 atm).
V is the volume of the gas in L (V = 4000 mL = 4.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 30ºC + 273 = 303 K).
∴ n = PV/RT = (4.0 atm)(4.0 L)/(0.0821 L.atm/mol.K)(303 K) = 0.643 mol.
What would the potential of a standard hydrogen electrode (S.H.E.) be if it was under the following conditions?
[H+] = 0.88M Ph2= 1.7atm T=298k
Answer:
[tex]\boxed{\text{-8.5 mV}}[/tex]
Explanation:
The SHE is not under standard conditions, so we must use the Nernst Equation, which relates the cell potential to the standard potential and to the activities of the electroactive species.
[tex]E = E^{\circ} - \frac{RT}{zF}lnQ[/tex]
Step 1. Write the equation for the cell reaction
Anode: H₂(1 atm) ⇌ 2H⁺(1 mol·L⁻¹) + 2e⁻
Cathode: 2H⁺(0.88 mol·L⁻¹) + 2e⁻ ⇌ H₂(1.7 atm)
Overall: H₂(1 atm) + 2H⁺(0.88 mol·L⁻¹) ⇌ 2H⁺(1 mol·L⁻¹) + H₂(1.7 atm)
Step 2. Calculate Q
[tex]Q = \frac{1 \times 1.7 }{ 1 \times 0.88} = 1.93[/tex]
Step 3. Apply the Nernst equation
Data:
E° = 0 V
R = 8.314 J·K⁻¹mol⁻¹
T = 298 K
n = 2
F = 96 485 C/mol
Calculation:
[tex]E = 0 - \frac{8.314 \times 298}{2 \times 96 485}\ln1.93[/tex]
= -0.0128 × 0.658
= -0.0085 V
= [tex]\boxed{\text{-8.5 mV}}[/tex]
PLEASE HELP ASAP!!!!!!
If a geologist wanted to determine if two landmasses were once connected millions of years ago, by using the theory of Continental Drift. Explain what evidence maybe be collected for their investigation, and how they may use this evidence to determine if these land masses were connected.
Fossils found on both landmasses can indicate whether they were connected in the past.
Hello!
I know I am super late to this but this answer is so the other person can have brainliest :)
Have a great day!
~Grace~
The reaction 2KClO3 (s) ->2KCl (s) + 3O2 (g) is a
Answer:
(C) Decomposition reaction
Explanation:
A decomposition reaction is a chemical reaction in which a single compound breaks down into two or more compounds or elements.
in this example
2KClO₃(s) ->2KCl (s) + 3O₂ (g)Potassium chlorate (KClO₃) decomposed to two smaller compounds KCl and O₂ gas.
So, the right choice is (C) Decomposition reaction
1.
What would likely happen if you were to touch the flask in which an endothermic reaction were occurring?
The flask would probably feel warmer than before the reaction started.
The flask would probably feel cooler than before the reaction started.
The flask would feel the same as before the reaction started.
Answer:
The flask would probably feel cooler than before the reaction started.
Reasoning:
Endothermic is a process or reaction accompanied by or requiring the absorption of heat
If you were to touch the flask in which an endothermic reaction were occurring, the flask would probably feel cooler than before the reaction started.
Explanation:If you were to touch the flask in which an endothermic reaction were occurring, the flask would probably feel cooler than before the reaction started. This is because an endothermic reaction absorbs heat from its surroundings, including your hand, making it feel cooler. An example of an endothermic reaction is the dissolution of ammonium chloride in water.
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If a 53.27g sample of potassium nitrate (KNO3) is dissolved in enough water to make 461 mL of solution, what will be the molarity?
Answer:
1.143 M.
Explanation:
Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.
M = (no. of moles of solute)/(V of the solution (L)).
∴ M = (mass/molar mass)of KNO₃/(V of the solution (L)).
∴ M = (mass/molar mass)of KNO₃/(V of the solution (L)) = (53.27 g / 101.1 g/mol)/(0.461 L) = 1.143 M.
When does incomplete combustion occur?
A.
sufficient supply of oxygen
B.
insufficient supply of carbon dioxide
C.
sufficient supply of carbon dioxide
D.
insufficient supply of oxygen
Answer:
D. insufficient supply of oxygen
Explanation:
Combustion is an exothermic reaction which involves the burning of a compound in the presence of oxygen. Combustion is a very useful life process as it produces heat and light.
For a complete combustion reaction to occur, the compound must be burnt over excess oxygen. The product is usually carbondioxide and water with release of some particulate matter.
In incomplete combustion, there is deficiency of oxygen. Here, oxygen becomes the limiting agent and it drives the reaction to an end. Incomplete combustion is always accompanied with the production of poisonous carbon monoxide and Carbon. We see incomplete combustion when smoke forms or when burning is accompanied by production of soot.
What makes a combustive process complete or not is the availability of oxygen gas for the reaction.
The speed of a note created by a flute will increase as the speed of sound increases. When a marching band goes outside on a cold day, what would you predict would happen to the note played on a flute?
A) It would decrease because the speed of sound and temperature are proportional.
B) It would increase because the speed of sound and temperature are proportional.
C) It would decrease because the speed of sound and temperature are inversely proportional.
D) It would increase because the speed of sound and temperature are inversely proportional.
Answer:
A.
Explanation:
Answer:
A
Explanation:
I just took the usatestprep