Answer: C, 1.68 x 10^-21
Explanation: Edge 2022
Which method for treating arthritis is an example of pseudoscience?
Answer:
magnets
Explanation:
Pseudoscience is "a collection of beliefs or practices mistakenly regarded as being based on scientific method".. keyword: based; it is not science. It is merely a belief. Magnets are not scientifically confirmed as useful in arthritis treatment. There is only a belief that magnets can cure arthritis. So, the answer is magnets
Hope this helps.
- profparis
covers 70 precent of earths surface
Answer:
Water covers 70 percent of earth's surface.IB Chemistry - Stoichiometry
In which mixture is NaOH the limiting reagent?
A. 0.20 mol NaOH + 0.10 mol H2SO4
B. 0.10 mol NaOH + 0.10 mol H2SO4
C. 0.20 mol NaOH + 0.10 mol HNO3
D. 0.10 mol NaOH + 0.10 mol HNO3
In which mixture of 0.10 mol NaOH + 0.10 mol [tex]H_2SO_4[/tex], NaOH is the limiting reactant. Hence option B is correct.
What is a limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
Reaction
[tex]2NaOH + H_2SO_4[/tex] → [tex]Na_2SO_4 + 2H_2O[/tex]
For one mole of [tex]H_2SO_4[/tex] we need two moles of NaOH.
Option A: equivalent quantities
Option B: NaOH is limiting rectant.
[tex]NaOH + HNO_3[/tex] → [tex]NaNO_3+ H_2O[/tex]
For one mole of [tex]HNO_3[/tex] we need one mole of NaOH.
Option C: NaOH in excess
Option D: equivalent quantities
In which mixture of 0.10 mol NaOH + 0.10 mol [tex]H_2SO_4[/tex], NaOH is the limiting reactant. Hence option B is correct.
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In a calorimeter, a 1.0 g sample of magnesium is burned to form mgo. in doing so, 25.5 kj of energy are released. what is the molar enthalpy of combustion in kj/mol of magnesium?
question 2 options:
0.6324
1.54 x 1025
0.0392
620
25.5
The molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol, Option D is the correct answer.
What is enthalpy of Combustion ?The energy released when a fuel is oxidized by an oxidizing agent is called enthalpy of Combustion.
It is given that
a 1.0 g sample of magnesium is burned to form MgO. in doing so, 25.5 kj of energy are released.
Molecular weight of Magnesium = 24.35g
24.35 g makes 1 mole of Mg
1g = 1/24.35
For 0.04 moles 25.5 kJ is released
for 1 mole 25.5 *1/.04
= 620 kj/mol
Therefore the molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol.
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How many moles of NH3 are produced in the reaction of 3.3 moles of N2?
N2 + 3H2 = 2NH3
Answer:
6.6 moles of NH3
Explanation:
3.3 mol N2 * (2 mol NH3/ 1 mol N2) = 6.6 mol NH3
What differences do you notice when you heat up the brick and the iron at same temperature?
After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.
What is thermal energy?Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.
Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.
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how many grams of water would require 22000 joules of heat to raise its temperature from 34 C to 100 C. THe specific heat of water is 4.2 j/g C
The mass of water required to raise 22000 joules of heat from a temperature of 34°C to 100°C is 79.37g.
How to calculate mass?The mass of a substance can be calculated by using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature22000 = m × 4.2 × (100 - 34)
22000 = 277.2m
m = 22000/277.2
m = 79.37g
Therefore, the mass of water required to raise 22000 joules of heat from a temperature of 34°C to 100°C is 79.37g.
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Magnesium combines with oxygen to form magnesium oxide. If 10.57 g of
magnesium reacts completely with 6.96 g of oxygen, what is the percent by mass of
oxygen and magnesium?
The total mass is 10.57+6.96=17.53 g.
So, the percent by mass of magnesium is (10.57)/(17.53) * 100 = 60.3%
The percent by mass of oxygen is (6.96)/(17.53) * 100 = 39.7%
This is the overall reaction of a mercury oxide dry cell:
Zn+ HgO —> ZnO + Hg
In this reaction, which example gets reduced?
O
HgO
Zn
Hg
Answer:
Hg gets reduced
(Look at the equation; notice how Hg loses O while Zn gains it)
Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure?
solubility
supersaturated
dissolution rate
concentrated
Answer:
A. Solubility
Explanation:
got it right on edge 2022
a natrual distsater caused a population of 4,695 organisms to migrate to a new habitat. a few generations after the disaster it was observed that the new habitat did not sopport the survival of the species. the table shows the population of the species in two habitats
Answer:
49.54%
Explanation:
Given parameters:
Number of organisms in original habitat = 4695
Number of organism in new habitat = 2326
Solution:
To find the percentage of the organisms in the new habitat that has migrated to the new habitat, we use the expression below:
% of the population in the new habitat = x 100
% of the population in the new habitat = x 100 = 49.54%
What is the percentage by volume of 30.0 mL ethanol (C2H6O) dissolved in 150.0 mL water (H2O)?
16.7 %
20 %
83.3 %
15 %
Answer: 16.7 %
Explanation:
[tex]\frac{30.0}{150.0+30.0}=\boxed{16.7\%}[/tex]
When a racemic mixture is reacted with a single enantiomer of another compound, then a pair of _________ is formed.
When a racemic mixture reacts with a single enantiomer of another compound, then a pair of diastereomers are formed.
What is a racemic mixture?A racemic mixture is an equimolar composition of enantiomers are optically inert. On the right side and the left side of the enantiomer in a chiral molecule, they contain an equal amount.
Now, in an organic reaction:
When a racemic mixture reacts with a single enantiomer of another compound, two compounds are formed and their formation possesses the different configurations on each side. Hence, a pair of diastereomers are formed.
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Is Los Angeles affected by ocean acidification?
Answer:
No son los angeles pero en realidad....
Explanation:
¿Qué provoca la acidificación de los océanos?
Cuando el CO2 es absorbido por el océano, se producen reacciones químicas. En particular, se forma ácido carbónico y se liberan iones de hidrógeno; como resultado, el pH de las aguas superficiales del océano disminuye, haciéndolas más ácidas.
Which type of reaction does this diagram represent?
Answer:
Nuclear fission
Explanation:
Because the little particles are being spread out and the two elements are broken apart
Part H
The concept of entropy might best be illustrated by:
A. The birth of a baby.
B. A construction crew building a skyscraper.
C. An old building on the verge of collapsing.
D. The organization of a rock band.
Review
1. Energy is measured in metric units called ______________
2. An example of electromagnetic energy would be:
a. A windmill.
b. A nuclear isotope like uranium.
c. An X-ray.
d. Coal.
3. The formula (mv2/2) provides a way to calculate the ______________ energy of an object.
4. To calculate the gravitational potential energy of a statue on a 10-meters-tall platform, you would have to know the statue's ______________
5. When a match is struck, the chemical energy stored in the match's head is converted to _____________ and _____________ energy.
6. Heat can be transferred through ______________. ______________, or _________?
7. The Law of Conservation of Energy states that ____________________________ _
8. "You can't get more energy out of something than you put into it" is a statement of?
9. T or F? Living things show that the concept of entropy is not true.
10. Explain why mines dug deep within the earth are often quite hot.
11. What kind of energy does not do work?
12. Sir Marvin decided to improve the destructive power of his cannon by increasing the size of his cannonballs. Sir Seymour kept his cannonballs the same size, but improved his powder to provide more velocity.
a) Which knight will have the more destructive cannon? Why?
b) Jupiter is a more massive planet than either Saturn or Earth. Saturn is more massive than Earth. On which planet would an astronaut weigh the most?
13. T or F? Radiant energy is generated by a petunia on Tuesday.
14. In terms of the laws of thermodynamics, explain why a refrigerator vents hot air.
Answer:
See explanation.
Explanation:
-_-
Part H: C
Review:
1. joules
2. c
3. kinetic energy
4. mass
5. heat and light
6. conduction, convection, or radiation
7. the amount of energy in the universe is constant / energy can neither be created nor destroyed
8. Law of Conservation of Energy / Impossibility of Perpetual Motion
9. F
10. The earth's core.
11. Potential energy.
12. Nice to know.
a) Sir Seymour. The kinetic energy equation has velocity squared. Increasing velocity is much more destructive..
b) Jupiter. Weight is gravity acting on mass. Gravity increases with mass. So Jupiter.
13. True.
14. Second Law of Thermodynamics describes heat flow from hot to cold objects. So, for the refrigerator to work, it needs to steadily expell hot air or objects inside won't cool as they releases heat to the surrounding air inside the refrigerator.
What does it mean for a strong base to be in equilibrium?
o the position of equilibrium lies far to the right, with products being favored.
o the position of equilibrium lies far to the left, with products being favored.
there is a great deal of base and very few ions.
o there is an equal amount of reactants and products.
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The position of equilibrium lies far to the right, with products being favoured. Hence, option A is correct.
What is equilibrium?Chemical equilibrium is a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
A very high value of K indicates that at equilibrium most of the reactants are converted into products.
The equilibrium constant K is the ratio of the concentrations of products to the concentrations of reactants raised to appropriate stoichiometric coefficients.
When the value of the equilibrium constant is very high, the concentration of products is much higher than the concentration of reactants.
This means that most of the reactants are converted into products and the position of equilibrium lies far to the right, with products being favoured.
Hence, option A is correct.
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Which is the SI base unit for mass?
meter
pound
gram
foot
Answer:
[tex]gram[/tex]
Explanation:
ueuhe
The empirical formula of a chemical substance is CH₂. The
molar mass of a molecule of the substance is 56.108 g/mol.
What is the molecular formula of the chemical substance?
Answer:
Explanation:
Remark
CH2 provides the basic structure of the hydrocarbon. It will be multiplied by some factor determined by the number of grams / mol. I will use rounded numbers because all periodic tables are slightly different.
Theoretical mass of CH2
1 C = 1 * 12 = 12
2 H= 2 * 1 = 2
Mass CH2 = 14
The multiplier for CH2
56.108 rounded = 56
Multiplier = molar mass (rounded)/Mass CH2
Multiplier = 56/14 = 4
Chemical
(CH2)_4 = C4H8
Answer: C4H8
state 2 gases used for combustion
Why isn’t K+ H2O —> KOH + H2 not balanced?
Answer:
The obtained result indicates that the hydrogen atom is not equal on both sides. Thus the reaction is not balanced.
Explanation:
What phrase Best defines energy 
Answer:
the ability to do work.
Explanation:
What causes this nuclear reaction to occur
Answer:
bombarding it with an energetic particle
Explanation: nuclear reaction, a change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle. The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy-ion.
Scientists observe that iron compounds are able to bind to nutrients in waterways experiencing eutrophication. Which change will most likely occur if iron compounds are added to a lake with an overabundance of nutrients? (1 point)
1. Fewer microorganisms will grow on the surface of the lake
2. More areas of hypoxia will occur in the lake.
3. More contaminated water will reach the lake.
4. Less sunlight will reach aquatic plants in the lake.
Which phrase best describes fracking?(1 point)
1. removing the top layer of an ore-bearing mountain to access oil and gas resources
2. using water and chemicals at high pressure to open up fissures to access oil and gas resources
3. using water and chemicals at high pressure to open up fissures to access mineral resources
4. removing the top layer of an ore-bearing mountain to access mineral resources
SOMEONE PLEASE HELP QUICK!!!
(1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.
(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct.
What are microorganisms?An organism that can be seen only through a microscope.
Iron is a natural capping agent which can enhance sediment P binding capacity, thus reducing P availability and shifting a lake from an algal to a macrophyte dominated state. Iron could, however, also impose toxic effects on the biota.
Fracking is the injection of a fluid at high pressure into an underground rock formation to open fissures and allow trapped gas or crude oil to flow through a pipe to a wellhead at the surface.
This technique is used in natural gas and petroleum production.
1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.
(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct
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ladybug beetles chase, capture, and eat smaller insects called aphids. which best describes this relationship?
The relationship is predation. The ladybugs are the predators and the aphids are the prey.
What is predation?Predation is an interaction in which one organism, the predator, eats all or part of the body of another organism, the prey.
As per the information in the question, Ladybug beetles chase, capture, and eat smaller insects called aphids.This means that aphids act as food sources for Ladybug beetles.
Predation can be described as a biological interaction between two organisms belonging to two different species where one organism ( called predator) captures and consumes/eats another organism ( that is called prey).
Here, Ladybug beetles ( that capture and eat small insects) are predators and the insects are prey.
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What is the importance of a special habitat?
Please help/show work!
how many grams of n2 has gave a volume of 11.2 liters at stp? ideal gas law
Answer:
7.00335g
Explanation:
[tex]n=\frac{V}{V_m} \\n = \frac{11.2}{22.4} \\n= 0.5 mol[/tex]
[tex]n=\frac{m}{M} \\m=nM\\m=(0.5)(14.0067)\\m=7.00335g[/tex]
Name each of the following compounds
a. MnS2
b. HClO4 (aq)
c. NH4C2H3O2
d. Li3N
e. Na2O2
Answer:
a. Manganese (IV) sulfide
b. Perchloric acid
c. Ammonium acetate
d. Lithium nitride
e. Sodium peroxide
Explanation:
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he hybridization of one s and one p orbital will result in the formation of _____ sp hybrid orbitals. This will leave _____ unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves _____ unhybridized p orbital(s). Multiple choice question. two; two; no two; two; one three; two; one one; two; one
The complete statement is "The hybridization of one s and one p orbital will result in the formation of two sp hybrid orbitals. This will leave two unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves one unhybridized p orbital(s). " Option B. This is further explained below.
What is hybridization?Generally, hybridization is simply defined as hybridization describes the offspring produced when one species of plant or animal mates with another.
In conclusion, After a cluster of sp2 hybrid orbitals forms, there is still one p orbital that is not hybridized (s).
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Using a spatula and a balance, measure 2.50 g copper(II) chloride (CuCl₂). You may need to add
and subtract to get exactly 2.50 g.
someone help i don’t get this
The mass of the solid is measured using a balance on and a filter paper.
How do you measure a solid?Measurement is very important in the chemistry laboratory. It is often important to measure the mass of a solid which could be used to prepare a solution.
In such cases, a filter paper is placed on the balance and the mass of the paper is measured. The solid is now placed on the paper until the value reads the sum of the masses of the paper and the solid to be measured.
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