Answers
Answer:
I think C...................
Related Questions
17. If the pOH of a solution is 4.5, What is the pH ?
A) 8.5
B) 7.5
C) 9.5
D) 7.0
Answers
Answer:
C)9.5
Explanation:
Given poH=4.5
find ph
from 14=ph+poh
14=ph+4.5
ph=9.5
The initial amount of low-quality energy available from an energy resource is called its net energy.
Answers
Answer:
La cantidad de energía disponible de una fuente de energía determinada se denomina recurso energético. La escasez de recursos energéticos (petróleo, carbón y madera) en algunas de las fuentes de energía más utilizadas plantear necesidad de usar otras fuentes investigar el modo más rentable de emplearlas
Explanation:
Answer:
false
Explanation:
its the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make the energy available.
Why does chemical changes lead to the formation of compounds.Justify
Answers
Answer:
The addition of energy through the chemical reaction when substance combines and gets decomposed.
Explanation:
Chemical changes take place when the substance combines with some other to form a chemical synthesis and gets alternatively decomposed into 2 different substances through chemical reactions. As when the chemical reactions occur the atoms rearrange themselves. As these are accompanied by the energy changes. Such as those of sodium and water to produce sodium hydroxide and hydrogen. The chemical changes are found in organic, inorganic, and biochemical changes.Does heating a cup of water allow it to dissolve more sugar? Temperature of the water is measured in degrees Centigrade. Amount of sugar is measured in grams. Dependent
Answers
Answer:
Yes
Explanation:
Yes heating water allows it to dissolve more Sugars because the molecular distance increases and this distance can be covered by more sugar. In the given question, The independent variable would be the temperature of water.
What causes the pressure inside oxygen tanks to change as they are filled?
A. The temperature of the gas changes.
B. The volume of the container changes.
C. The pressure outside the tanks changes.
D. The number of gas molecules changes.
Answers
Answer:
The answer would be D.
: )
Explanation:
The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.
What are oxygen tanks?Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.
As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.
By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.
Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.
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Hola!
Bonjour!
Niihau!
Hello!
How are you?! How has life been? This is a mental health check-in. If you see this and you don't think you need to answer this, please leave a spot open for someone who may need it or write in the comments!
So after that: How are you? Happy, Sad, Mad, Confused, Hurt, Slow? Anything. Just tell me anything. If you need advice you can say so and you could get helpful advice from people! I really hope you know you're special and loved beyond imagination. It's gonna be hard some days but that's how we appreciate the good days! :) Keep doing you boo! <3
Answers
Answer:
Hi! I'm feeling great and happy! Life's been good! How are you? :) Hope life's good for you and that you are staying safe.
Explanation:
A gas has a pressure of 1.00 atm at 25 degrees Celsius. What is the pressure of the gas at 323 degrees Celsius.
Please help thanks.
Answers
Answer:
The pressure of the gas at 323 degrees Celsius is 2 atm.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
Where P = pressure, T = temperature, K = Constant
Having two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 1 atmT1= 25 C= 298 K (being 0 C= 273 K)P2= ?T2= 323 C= 596 KReplacing:
[tex]\frac{1 atm}{298 K} =\frac{P2}{596 K}[/tex]
Solving:
[tex]P2=\frac{1 atm}{298 K}*596 K[/tex]
P2= 2 atm
The pressure of the gas at 323 degrees Celsius is 2 atm.
Which model could represent a neutral atom of nitrogen
Answers
Answer:
The answer is c.1. The atomic number of nitrogen is 7.
The electron arrangement of nitrogen is 2.5. With that said, atom 1 resembles the neutral atom of nitrogen because the innermost shell of the atom contains 2 electrons while the outermost shell of the atom contains 5 electrons.
The model that could represent a neutral atom of nitrogen is the first one. Thus, the correct option is C.
What is a Nitrogen atom?A nitrogen atom may be defined as a chemical element with an atomic number of 7 and an atomic mass of 14. It contains seven protons in its nucleus.
Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table. Being neutral, the number of protons that it has in its nucleus must be equal to that of the surrounding electron. Hence, the number of electrons are seven.
These seven electrons are only visible in the first model. Thus, the correct option for this question is C.
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Calcula la densidad del gas a TPE para los siguientes: 969cm3 de un gas 64 grados C y 96.4 kPa con una masa de 1.64g
Answers
Respuesta:
2.17 × 10⁻³ g/cm³
Explicación:
Paso 1: Información provista
Volumen inicial (V₁): 969 cm³Temperatura inicial (T₁): 64 °CPresión inicial (P₁): 96.4 kPaVolumen en TPE (V₂): ?Presión estandar (P₂): 100 kPaTemperatura estandar (T₂): 273.15 KPaso 2: Convertir 64 °C a Kelvin
Usaremos la siguiente fórmula.
K = °C + 273.15 = 64 °C + 273.15 = 337 K
Paso 3: Calcular V₂
Usaremos la ecuación combinada de los gases ideales.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
V₂ = P₁ × V₁ × T₂ / T₁ × P₂
V₂ = 96.4 kPa × 969 cm³ × 273.15 K / 337 K × 100 kPa = 757 cm³
Paso 4: Calcular la densidad del gas a TPE
A TPE, 1.64 g del gas ocupan 757 cm³.
ρ = 1.64 g/757 cm³ = 2.17 × 10⁻³ g/cm³
Equal volumes of nitrogen and oxygen, at the same temperature and
pressure, would:
a. have the same mass
b. contain the same number of particles
C. contain different numbers of particles
d. have different kinetic energies
Answers
Equal volumes of nitrogen and oxygen, at the same temperature and pressure, would: b. contain the same number of particles.
Avogadro's law states that, equal volumes of all gas samples have the same number of atoms or molecules at the same temperature and pressure.
In Science, the Avogadro's number is typically used to determine the number of atoms or molecules that are contained in a certain mass of a chemical element.
Note: Avogadro's constant is equal to [tex]6.02 \times 10^{23}[/tex]
In conclusion, equal volumes of nitrogen and oxygen, at the same temperature and pressure, would contain the same number of particles (atoms or molecules) in accordance with Avogadro's law.
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A student dissolves 0.112 mol sucrose in enough water to make 4.0 L of solution. What is the molarity of the solution
Answers
Answer: Molarity of the solution is 0.028 M.
Explanation:
Given : Moles of sucrose (solute) = 0.112 mol
Volume of solution = 4.0 L
Molarity is the number of moles of solute dissolved in a liter of solvent.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.112 mol}{4.0 L}\\= 0.028 M[/tex]
Thus, we can conclude that molarity of the solution is 0.028 M.
which of the following elements has the highest electronegativity?
A) oxygen
B) nitrogen
C) carbon
D) boron
Answers
Answer:
option d) is the correct answer
How many moles of Manganese there in are 5.76 x 10(15) atoms of Mn?
How many moles of sodium chloride are in a 431.6 g sample of NaCl?
Answers
Answer:
1. 9.57 × 10^-9 moles.
2. 7.38mol
Explanation:
1.) To find the number of moles there are in the number of particles in an atom, we divide the number of particles (nA) by Avagadro's constant (6.02 × 10^23)
Hence, to find the number of moles (n) of Manganese (Mn), we say:
5.76 x 10^15 atoms ÷ 6.02 × 10^23
5.76/6.02 × 10^(15-23)
= 0.957 × 10^-8
= 9.57 × 10^-9 moles.
2.) Mole = mass/molar mass
Molar mass of sodium chloride (NaCl) = 23 + 35.5
= 58.5g/mol
mole = 431.6 g ÷ 58.5g/mol
mole = 7.38mol
How many grams of aluminum to complete the reactions below?
Extra Content
6HCl(aq) + 2Al(s) → 2AlCl3(s) + 3H2(g)
six moles of hydrochloric acid reacts with two moles of aluminum to produce 2 moles of aluminum chloride plus 3 moles of hydrogen gas.
A.
26.9 grams
B.
55 grams
C.
53.96 grams
D.
2 grams
Answers
The answer is option C
Explanation:
Al= 26.982
2 moles of aluminium wad given so
2× 26.982= 53.96 grams
plzz help 20 points plzzzz
Answers
The answer is: Element B
. The following describes some reactions that started with magnesium metal:
Calcium was heated in air to form a substance G G was added to a beaker of water to form
substance L. This substance L was then added to dilute sulphuric acid to form M and a liquid B.
a) Identify the substances labelled G, L, M and B
(2 Marks)
G
L
M
B
Answers
Answer:
This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat). Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.
Explanation:
Question 2
5 pts
The air inside a beach ball is at a temperature of 25°C a pressure of 1.0 atm. The ball
contains 0.85 mol of air, what is its volume?
21 L
27 L
0 171
06.11
< Previous
Nest
Answers
Answer: The volume of given ball is 21 L.
Explanation:
Given : Pressure = 1.0 atm, no. of moles = 0.85 mol
Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]
According to the ideal gas equation, formula used is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.0 atm \times V = 0.85 mol \times 0.0821 Latm/mol K \times 298 K\\V = 21 L[/tex]
Thus, we can conclude that the volume is 21 L.
Who discovered electrons
Answers
during tbe 1880s and 90s scientist searched cathode rays for the carrier of the electrical properties in matter. the person who discovered Thomson of the electron of 1897.
Select the correct answer.
An iron bar at 200°C i placed in thermal contact with an identical iron bar at 120°C in an isolated system. After 30 minutes, both iron bars are at
160°C. the iron bars were placed in thermal contact in an open system instead of an isolated system, how would the results be different?
Assume that the room temperature is 25°C.
O A The temperatures of the iron bars after 30 minutes would be less than 160°C because heat would be lost to the surroundings.
O B. it would take more than 30 minutes for both iron bars reach 160°C because heat would be transferred less efficiently.
O C. The temperatures of both iron bars would increase as they absorb heat from the surroundings.
O D. The temperatures of both iron bars would decrease because pieces of them would be lost to the surroundings.
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Answers
How many moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen?
Extra Content
N2(g) + 3H2(g). → 2NH3(g)
1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia gas
A.
100 moles
B.
25 moles
C.
50 moles
D.
75 moles
Answers
Answer:
I think b
Explanation:
50 moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen. Therefore, the correct option is option C.
What is moles?In the National System of Units, the mole represents the unit of substance amount. However many elementary units of a particular substance are present inside an object as well as sample is determined by the quantity of that material. There are precisely 6.022×10²³ elementary entities in a mole.
An elementary object may include an atom, any molecule, and ion, an ion pair, or perhaps a subatomic particle like an electron depending upon what the substance is.
N[tex]_2[/tex](g) + 3H[tex]_2[/tex](g). → 2NH[tex]_3[/tex](g)
moles of nitrogen = 25 moles
the mole ratio between nitrogen and ammonia is 1:2
moles of nitrogen = 25×2=50 moles
Therefore, the correct option is option C.
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N. 39.8 g HzF to L. unit convert
Answers
Answer: 39.9 g HzF is equivalent to 0.0398 L.
Explanation:
According to the standard conversion factor,
1 gram = 0.001 L
Therefore, 39.8 g will be converted into liter as follows.
[tex]1 g = 0.001 L\\39.8 g = 39.8 g \times \frac{0.001 L}{1 g}\\= 0.0398 L[/tex]
Thus, we can conclude that 39.9 g HzF is equivalent to 0.0398 L.
How many moles of calcium oxide are formed when 3 moles of calcium react with oxygen?
Answers
Answer:
3 moles of Calcium Oxide are formed
Explanation:
Based on the reaction of Calcium Ca, with oxygen, O₂, to produce calcium oxide, CaO is:
2Ca + O₂ → 2CaO
where 2 moles of calcium produce 2 moles of Calcium oxide.
That means, if 3 moles of Ca react in presence of oxygen:
3 moles of calcium oxide are formed
what will happen when the rates of evaporation and condensation are equal
Answers
Calculate the pH of the solution:
[OH-] = 1x10^-11M
a.11.0
b.12.0
c.2.7
d.3.0
Answers
p [OH-] = -log[OH-]= -log ( 1x10^-11M) = 11
we know that
p[OH-] + p[H+] = 14
so p[H+] = 14- p[OH-] = 14- 11 = 3
pH = 3, answer
Make a list of all the possible human sources of carbon dioxide. Giving brainliest
Answers
A scientist wants to test the effectiveness of a medicine in treating
headaches. He puts the medicine into cookies and then tells his subjects to
lie down and have a cookie when they have a headache. He asks them to give
him feedback about how well these relaxation techniques work to cure their
headaches. What rule of ethics does this experiment break?
O A. The subjects are not informed that they are taking a medicine.
B. It is likely to harm his subjects.
C. The scientist is taking the work of others by reviewing the
subjects' feedback.
D. It is testing more than one variable at the same time.
Answers
Have a good day
How can you know if something has energy?
(Can you explain it in a sentence?)
Answers
Identify the gas law that applies to the following scenario: A 36.5 liter balloon holding 2.9 moles of carbon dioxide leaks. If we are able to determine that 1.2
moles of carbon dioxide escaped before the container could be sealed, what is the new volume of the container?
O Boyle's Law
Charles Law
Gay-Lussac's Law
Avogadro's Law
Answers
Answer:
Avogadro's Law
Explanation:
The amount of moles is directly proportional to the volume of the gas under constant temperature and pressure. That is the statement of Avogadro's law. The equation is:
V1n2 = V2n1
Where V is volume and n are moles of 1, initial state and 2, final state of the gas
That means, right option is:
Avogadro's LawComplete and balance the following neutralization reaction, and estimate the
likely pH of the neutralization point. (3 pts)
Ca(OH)2 + HNO3 →
Answers
Answer:
we have a base-Ca(OH)2 and an acid - HNO3
→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)
the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .
Explanation:
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Raj is trying to make a diagram to show what he has learned about nuclear fusion.
1 H e atom plus Energy right arrow 2 H atoms plus Heat plus Pressure.
Is his diagram correct, and if not, how could he fix it?
Yes, he should leave it as is because one atom of He plus energy results in two atoms of H and heat and pressure.
No, he should place energy on the right and heat and pressure on the left.
No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
No, he should place the He atom on the right and the H atoms on the left.
Answers
Answer:
hope it helps make brainlliest ty
Answer:
C: No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
Explanation: