Answer:
A
Explanation:
got from another website
The simulation which is least suitable to scientists for solving a problem is when performing an experiment that would be too costly or dangerous to conduct in the real world.
What is scientific approach?Scientific approach is an empirical method of acquiring knowledge and result. This method involved the careful observation of the problem, applying skepticism about the problem and giving cognitive assumptions also.
If a scientist wants to investigate several problems, then they will perform a large no. of trials at regular intervals to get the required result. But if performing of any experiment is dangerous to conduct in the real world then scientists will ignore to solve that problem.
Hence, option (C) is correct.
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In osmosis: a. Knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent. b. The semipermeable membrane is used to change the freezing and melting points of a solution. c. Solutions cannot have identical osmotic pressures. d. Temperature does not affect the osmotic pressure of a solution. e. At least two of the above statements are correct.
Answer:
a)
Explanation:
Osmosis is a process in which there is movement of solvent molecules through a semipermeable membrane to wards the higher concentration of solute or lower concentration of solvent from a lower concentration of solute molecule. Osmosis can occur in different liquids and even in gases.
Also, in osmosis knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent.
g A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 9.60 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was ________ mm Hg. Selected Answer: Incorrect 773 Answers: 882 793 661 773 Correct 96.0
Answer:
Answer: 882mmHg
Explanation:
In a closed-end manometer, the gas added is under a pressure that is measured against atmospheric pressure. The difference in pressure between both gases is equal to the difference in mercury levels. Thus, the pressure of the argon can be:
783 mmHg - 96.0mmHg = 687mmHg
783 mmHg - 96.0mmHg = 879mmHg
Based on the options, the possible answer (The nearest to the second value) is:
Answer: 882mmHgPLEASE HELP, DUE AT 12:00
Answer:
5.C6.DExplanation:
YONG ISA PO ETO HINDI KO PO ALAM TOH
Help me find out which reaction is balanced
Answer:The answer is c
Explanation:
choose me physics subject
8. What is the mass of 4.50 x 1022 Cu atoms?
Answer:
4.7485 g
Explanation:
4.50 x 10^22 Cu atoms * (1 mol Cu / 6.022 x 10^23 Cu atoms) * 63.546 g Cu/(mol Cu) = 4.7485 g
In every mole of Cu, there are 6.022 x 10^23 atoms (Avogadro's number). The molecular weight of copper is 63.546 g/mol.
All of the following are examples of human organs EXCEPT the
1.heart
2.eyelashes.
3.skin
4. brain
It for science
Answer:
eyelashes are not a part of the the human organs
Determine la temperatura Kelvin de 2.49 moles de gas contenido en un
recipiente de 1.0 L a una presión de 143 kPa. *
1:How many moles of ammonia will be produced if 12 moles of nitrogen are used?
2:How many moles of nitrogen are required to react with 6 moles of hydrogen?
3:Honors: If there are 40 moles of nitrogen and 30 moles of hydrogen, what is the limiting reactant? Explain your answer.
4:Honors: What is the mass of hydrogen required to produce 80 g of ammonia?
Please, I really need help, so I can graduate
Answer:
See Explanation
Explanation:
The reaction equation is
3H2(g) + N2(g) -----> 2NH3(g)
1)If 1 mole of N2 yields 2 moles of NH3
12 moles of N2 will yield 12 * 2/1 = 24 moles of NH3
2) 3 moles of nitrogen reacts with 1 mole of nitrogen
6 moles of hydrogen will react with 6 * 1/3 = 2 moles of nitrogen
3) The limiting reactant yields the least amount of product
If 1 mole of nitrogen yields 2 moles of NH3
40 moles of nitrogen yields 40 * 2/1 = 80 moles of NH3
If 3 moles of hydrogen yields 2 moles of NH3
30 moles of hydrogen yields 30 * 2/3 = 20 moles of NH3
Hence hydrogen is the limiting reactant
4) Number of moles in 80g of NH3 = 80g/17g/mol = 4.71 moles
3 moles of hydrogen produces 2 moles of ammonia
x moles of hydrogen produces 4.71 moles of ammonia
x = 3 * 4.71/2 = 7.065 moles of hydrogen
Mass = 7.065 moles of hydrogen * 2 g/mol
Mass = 14.13 g of hydrogen
Helpppooo give answer thanks
Answer:
625 mL
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V₁) = 250 mL
Molarity of stock solution (M₁) = 5 M
Molarity of diluted solution (M₂) = 2 M
Volume of diluted solution (V₂) =?
The volume of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
5 × 250 = 2 × V₂
1250 = 2 × V₂
Divide both side by 2
V₂ = 1250 / 2
V₂ = 625 mL
Therefore, the volume of the diluted solution is 625 mL.
Which of the following statements explains how concentration of a solution affects the rate of a reaction? (5 points)
O a
When concentration decreases, kinetic energy increases.
Ob
When concentration increases, particles collide less often.
When concentration increases, particles collide more often.
Oc
Od
When concentration decreases, collision of particles increases.
Answer:
when concentration increases, particles colide more often
The statement "When concentration increases, particles collide more often" is correct.
What is concentration?A constituent's abundance divided by the entire volume of a combination is known as concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.
There are much more reactant particles travelling together as the concentration of reacting species increases. Because there would be more collisions, the reaction rate will be faster. The rate of a reaction increases as the concentration of reactants increases.
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g A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.
Answer:
the rate at which reactants form products is the same as the rate at which products form reactants
Explanation:
There is still a reaction happening just that the second one happens the opposite happens and keeps it at net 0
Consider this reaction at equilibrium:
2BrNO (g) → 2NO (g)+ Br2 (g)
Predict whether the reaction will shift left, shift right, or remain unchanged after each disturbance.
a. NO is added to the reaction mixture
b. BrNO is added to the reaction mixture
c. Br2 is removed from the reaction mixture
d. Pressure is increased
Answer:
a. NO is added to the reaction mixture ⇒ to the left
b. BrNO is added to the reaction mixture ⇒ to the right
c. Br₂ is removed from the reaction mixture ⇒ to the right
d. Pressure is increased ⇒ to the left
Explanation:
The reaction at equilibrium is the following:
2BrNO (g) → 2NO (g)+ Br₂ (g)
The left side is the reactants side (2 BrNO) and the right side is the products side (2 NO + Br₂).
a. NO is added to the reaction mixture
NO is a product, in the right side of the equation. If a product is added, the equilibrium will shift to the opposite side, to the left, to form more reactants and compensate for the addition.
b. BrNO is added to the reaction mixture
BrNO is a reactant, in the left side of the equation. If a reactant is added to a reaction at equilibrium, more product will be formed in compensation. Therefore, the equilibrium will shift to the right.
c. Br₂ is removed from the reaction mixture
Br₂ is a product, in the right side. If it is removed, the system will compensate for the remotion by forming more product, so the reaction will shift to the right.
d. Pressure is increased
Since both reactants and products are in the gas phase, the equilibrium is affected by pressure. If pressure is increased, the equilibrium will shift to the side of the reaction with the fewest number of moles. The reactants side (left) has 2 moles of BrNO while the products side (right) has 3 moles (1 mol NO + 1 mol Br₂ = 3 moles of gas). Therefore, the reactants side has the fewest number of moles, so the equilibrium will shift to the left.
which property of metal is used for making utensils??
Answer:
Metals are good conductors of heat. Due to this property metals are used in the preparation of kitchen utensils. Aluminium is good conductor of heat and more over it is corrosion resistent. Due to these properties aluminium is used in making kitchen utensils.
Explanation:
What is the Molar mass of zinc
Answer:
the molar mass of zinc is 65.38u or 65.38 grams(g).
The lattice-like structure of a metal consists of negative metal ions in a "sea" of electrons.
O True
O False
Answer:
True
Explanation:
Which statement best describes what occurs during a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change
Answer:
The bonds in reactants break so that elements can rearrange form new products
Explanation:
If a balloon has a volume of 1.696 L at a pressure of 2.11 0 atmospheres, what will be the volume of the balloon if the pressure is increased to 5.067 atmospheres?
Answer:
I think that the volume will be 1.414
Explanation:
According to the formula of boyle's law P1 V1 = P2 V2
We have to find V2 so:
V2 = P2/P1 V1
By putting the values:
V2 = 5.06/2.11 * 1.696
V2 = 5.06/3.578
V2 = 1.414
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Describe the differences between a geocentric model and heliocentric model. What model is the current Sun-Earth-Moon System based on?
Answer:
Geocentric is a description that says all objects, including the moon, sun and stars orbit around the Earth.
Heliocentric is a description that says all objects including the moon, Earth and stars revolve around the sun.
Most textbooks would tell you that the current system is heliocentric.
Iron ore exists as Fe2O3. In order to remove the oxygen and generate pure iron, the oxygen must be transferred to another molecule. Carbon monoxide can be mixed with iron ore and carbon dioxide is generated. Carbon monoxide is produced in the combustion of carbon with limited oxygen. Calculate the value of ΔS° for the oxidation of carbon to carbon monoxide,
2C (s, graphite) + O2 (g) --> 2CO (g)
A. +179.4 J/mol K
B. +408.6 J/mol K
C. -408.6 J/mol K
D. +395.8 J/mol K
help!!!
1. How many grams of Ag+ are present in 2.24 grams of silver
sulfite?
grams Agt.
2. How many grams of silver sulfite contain 1.75 grams of Agt?
grams silver sulfite.
Answer:
1. 0.82 gram of Ag+
2. 4.79 g of Ag₂O₃S
Explanation:
From the given information:
Total amount of Ag₂O₃S = 2.24 grams
Atomic mass of Ag+ =107.86 g/mole
molar mass of Ag₂O₃S = 295.8 g/mole
∴
The mass of the Silver (Ag) in grams is:
[tex]= Total\ amount \ of \ Ag^+ \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]
[tex]=2.24 \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]
= 0.82 gram of Ag+
2.
Here, the total amount of Ag₂O₃S = unknown
Atomic mass of Ag+ = 107.86 g/mole
molar mass of Ag₂O₃S = 295.8 g/mole
amount of Ag+ = 1.75 g
∴
The mass of Ag₂O₃S = [tex]Total \ amount \ of \ Ag^+ \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]
[tex]=1.75 \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]
= 4.79 g of Ag₂O₃S
What is a natural resource?
Answer:
materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
Explanation:
Why are fossil fuels considered nonrenewable resources?
Answer:
They are considered nonrenewable because they are prehistoric animals that has been extinct therefore can't be renew.
What is the pH of a solution with a concentration of 7.6 × 10–7 M H3O+?
0.993
6.12
7.88
8.34
Answer:
Ph = 6.12....
here ya go
Explanation:
-
The pH of the solution with a concentration of 7.6 × [tex]10^{-7}M[/tex] [tex]H_{3}O^{+}[/tex]will be 6.12.
What is pH?The pH of water indicates how acidic or basic it is. The scale runs from 0 to 14, with 7 representing neutrality. Acidity is indicated by a pH less than 7, while a pH greater than 7 denotes a base. The relative number of free hydrogen, as well as hydroxyl ions in water, and hydroxyl ions in water is measured by pH .
It is known that ,[[tex]H_{3}O^{+}[/tex]]=[tex][H^{+} ][/tex]
pH can be calculated by the formula:
[tex]pH = -logH^{+}.[/tex]
Now, put the value of hydrogen ion in above equation
pH = -log[7.6×10^{-7}M]
= -log(7.6)-log(10^{-7}
= -0.88+7log 10
= -0.88 +7
= 6.12.
Therefore, the pH of the solution will be 6.12.
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how to make 100 ml of 0.001 mM solution with 0.0405mM solution?
Answer:
Measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water
Explanation:
To make 100 mL of 0.001 mM solution from 0.0405mM solution, we need to determine the volume of 0.0405mM solution needed. This can be obtained as follow:
Molarity of stock (M₁) = 0.0405 mM
Volume of diluted (V₂) = 100 mL
Molarity of diluted solution (M₂) = 0.001 mM
Volume of stock solution needed (V₁) =?
M₁V₁ = M₂V₂
0.0405 × V₁ = 0.001 × 100
0.0405 × V₁ = 0.1
Divide both side by 0.0405
V₁ = 0.1 / 0.0405
V₁ = 2.47 mL
Therefore, to make 100 mL of 0.001 mM solution from 0.0405mM solution, measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water.
Define, triple covalent bond
Answer:
it's a covalent linkage in which two atoms share three pairs of electrons as in nitrogen molecule or acetylene
The main biochemical components of living things are ___
Answer:
Amines ketones aldehydes and aromatic
Explanation:
my opinion but thats my answer
write one other example (other than the one in your note) of ore of the following metals
a) Aluminium
b) Lead
c) Iron
half equation for oxygen to oxide ions, aluminium ions to aluminium, magnesium to magnesium ions
what is the most well known supercontinent?
Answer:
Pangaea
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