all waves, except electromagnetic waves, need a medium to travel through. what is a "medium"? give 2 examples
Answer:
air water
Explanation:
Mediums that can have waves
2. What is the molarity of a solution made with 126.32 g of sodium hydroxide (NaOH) dissolved to make 874.2 mL of a solution?
Answer:What is the molarity of a solution made with 126.32 g of sodium hydroxide dissolved to make 874.2 mL of solution? answer. 3.612 M NaOH. 3.612 M NaOH.
Explanation:
formation of water: 2H2 + 1 O2 --> 2H2O
How many moles of H2O can be produced from 35 grams of O2?
Answer:
2.2 moles H2O
Explanation:
[tex]35g O_2 \mbox{ \cdot }\frac{1mol}{32g/mol} \mbox{ \cdot }\frac{2mol H_2O}{1mol O_2}= 2.1875[/tex], which rounds to about 2.2
formation of water: 2H2 + 1 O2 --> 2H20
How many moles of O2 will I need to produce 15 moles of H2O?
Answer don’t delete comment or I’ll report
Answer:
n=15 moles H2O
1:2
x:15
x=7.5 moles of O2
Where are taste buds located?
the tongue and roof of mouth
the roof of the mouth only
the roof and side of mouth
the tongue only
the tongue and roof of the mouth
would be the answer
Answer:
The tounge and roof of the mouthExplanation:
Stay safe, stay healthy and blessed.Have a good day !Thank you !#Jennifer
What is one element that is found in the human body, air, or the universe ?
Answer:
Hydrogen
Explanation:
It is pretty much present everywhere :)
At which position is the northern hemisphere experiencing winter?
The image includes the position and tilt of Earth in its orbit around the sun. Earth is tilted away from the sun in position A. In position B, the sun shines evenly on Earth from pole to pole. Earth is tilted toward the sun in position C. In position D, the sun shines evenly on Earth from pole to pole.
Public Domain
Point A
Point B
Point C
Point D
Answer:
Point A
Explanation:
The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.
Point A represents the position where the northern hemisphere is experiencing winter.
This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.
In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.
Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.
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How can objects all be the same size but have a different mass? *help quick*
Answer:
All objects can have the same size but have a different mass!
This is true, although it sounds fake. This is one example, there is a Neutron star, and Neutron stars are as big as a city, but they have a mass which is hundreds of times greater than our sun's mass. Because of them having so much mass, they are also having so much gravitational energy, which makes them also have gravity. They're so small, but have so much mass that they can do much. Even a drop of a neutron star can punch open the earth! It's true, so yes, it is possible for objects the SAME size to be having different masses according to that example.
But let's look on how they can have different mass.
They can have different masses becase of different densities. Put a iron ball inside water, and put an apple as close to the iron ball's side, what happens? The apple floats, becuase the apple's mass is less than the water, and the iron ball's mass is MORE than the water. So, because the iron ball is denser than the apple, that's why, it has more mass than the apple. The apple isn't much dense, it isn't as dense as water or the iron ball. But the iron ball is much more denser than the water. So because of the different material densities of the material, that's why it can have different masses.
Remember to Remember those 2 examples I gave you... (neutron star vs sun, iron ball vs apple on water)
What information does the percent composition of an atom in a molecule give?
A. The total number of atoms of that element in a molecule
B. The total mass that element contributes to a molecule
C. The relative amount of mass an atom contributes to a molecule
D. The relative number of atoms one element contributes to a molecule
Answer:
C
Explanation:
The percent composition of an atom in a molecule gives information regarding the relative amount of mass an atom contributes to a molecule.
Please Help I need an explanation on how to do this
Balanced equation(That should be NaClO_3)
[tex]\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O[/tex]
Remember that it's a ionic equation not general equation
So
We have to balance it accordingly
Answer:
Balanced equation(That should be NaClO_3)
\begin{gathered}\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O\end{gathered}⇛Cl2+2NaOH⟶NaCl+NaClO3+H2O
Remember that it's a ionic equation not general equation
So
We have to balance it accordingly
Hydrochloric acid is a strong acid, and 100% of the acid molecules dissociate, forming H3O+ ions in aqueous solution. What does this information tell you about the relative dissociation of weaker acids?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
According to above statement, HCl ( Hydrochloric acid ) is a strong acid, which when mixed in water dissociates complete in water to form H+ and Cl- ions that means 100% dissociation. but acids weaker than HCl shows relatively less dissociation.
That is less than 100% dissociation when mixed in water ~
This information tells us about the relative dissociation of weaker acids is that weaker acids dissociates less than 100%.
What is dissociation?Dissociation is defined as the breaking up of a compound into simpler constituents or components or parts. Ionic compounds dissociates in the water solution. Stronger acids have 100% ability to dissociate.
So we can conclude that this information tells us about the relative dissociation of weaker acids is that weaker acids dissociates less than 100%.
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Which reactions are spontaneous? i. c2h5oh(l) 3o2(g) right arrow. 2co2(g) 3h2o(l), delta.g = –36.7 kj ii. 2c6h6(l) 15o2(g) right arrow. 12co2(g) 6h2o(l), delta.g = –6,405 kj iii. caco3(s) right arrow. cao(s) co2(g), delta.g = 13.0 kj iv. ni(s) cl2(g) right arrow. nicl2(s), delta.g = 1,130.28 kj i and ii iii and iv i and iii ii and iv
Reactions I and II are spontaneous reactions since they have negative delta G values.
What are spontaneous reactions?Spontaneous reactions are reactions which proceed towards formation of products without addition of heat energy from the surroundings.
Spontaneous reactions have negative free energy change values (Delta G is negative) since the formation of products results in increase in entropy of the system.
Therefore, the spontaneous reactions are I and II because their delta G values are negative.
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Answer: A (I and II
Explanation:
PLS, I NEED HELP!!!!
Next, you will gradually apply heat to the sugar and observe the effects. Your goal is to identify the point at which sugar begins to melt. To get started, follow these steps. Then, answer the question that follows.
Pour 1 tablespoon of sugar into a cooking pan. Spread it out across the surface of the pan. Place the pan on a stove.
Because all stoves are different, you’ll need to identify your low, medium, and high heat settings before proceeding to step 3.
Use the method below to gradually heat the pan until you see the sugar begin to melt. Once the sugar melts, note how much time has elapsed and the final heat setting. If at any point the pan begins to smoke, immediately turn off the heat source and remove the pan from the heat. Heat the pan for these times and temperatures, stopping when the sugar begins to melt:
5 minutes on low heat
5 minutes on medium-low heat
5 minutes on medium heat
5 minutes on medium-high heat
5 minutes on high heat
When the sugar melts, turn off the stove and remove the pan from the heat. Do not touch the hot pan except by its handle. Use hot pads or oven mitts if the pan’s handle isn’t insulated. Let the pan sit off the heat on a heat-resistant surface until it cools.
Approximately how many minutes did it take for the sugar to melt? What was the final heat setting?
Repeat the process given in part D using salt instead of sugar. Did the salt melt? If so, approximately how many minutes did it take for the salt to melt?
When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
What is melting?The term melting has to do with the breakdown of the bonds that hold the molecules of a substance together. Melting occurs when heat is applied continously to a body.
Now, the time taken for the sugar to melt depends on the amount of heat supplied. In other words, when a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
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When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied. low heat makes the sugar take awhile to melt. High heat was the final heat setting. I took about 8-10 minutes.
What is the compound N₂O3 called?
Answer:
Explanation:
Dinitrogen trioxide is a nitrogen oxide. Nitrogen trioxide appears as a blue liquid with a sharp, unpleasant chemical odor.
Description: Dinitrogen trioxide is a nitrogen oxide.ChEBINitrogen trioxide appears as ...
Synonyms: Dinitrogen trioxideNITROGEN TRIOXIDENitrogen oxide (N2O3)10544-7...
Molecular Formula: N2O3
Molecular Weight: 76.012 g/mol
Answer:
It is called Dinitrogen trioxide. Hope this helps!
How many kilojoules of heat are produced when 34.0 g of Fe2O3 reacts with an excess of CO according to the following reaction? Fe2O3 + 3 CO 2 Fe + 3 CO2 ΔH = -26.3 kJ
The heat produced when iron oxide reacts with carbon monoxide is -23.47 kJ/mol.
What is the enthalpy of reaction?
The standard enthalpy of the reaction is given by the enthalpy of formation of the products and the reactants. The reactants and the products of the reaction are:
Fe₂O₃ (s) + 3CO (g) → 2Fe(s) + 3CO₂ (g)
We know,
The standard enthalpy of formation of iron oxide = −825.50 kJ/mol
The standard enthalpy of formation of carbon monoxide = −110.53 kJ/mol
The standard enthalpy of formation of carbon dioxide = −393.52 kJ/mol
The standard enthalpy of reaction is calculated as:
[tex]\rm \Delta H_{rxn}[/tex] = [2(0) + 3(−393.52)] - [1(-825.50) + 3(-110.53)]
= (0−1180.56+825.50+331.59)
= −23.47 kJ/mol
Therefore, −23.47 kJ/mol is produced.
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What is the best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction?
a) to decrease the amount catalyst during the reaction
b) to increase the molecular structure during the reactions
c) to decrease the rate of reaction
d) to increase the surface area of the reaction
The best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.
What is rate of chemical reaction?Rate chemical reaction is the speed at the which chemical compounds react which each other. Some factors can speed up the rate of chemical reaction and they include;
ConcentrationTemperatureSurface area, etc.A large surface area provides enough medium for chemical reaction to occur and hence speeds up the rate of chemical reaction.
Thus, the best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.
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Classify: Heat that is transferred in a circular motion with warm particles rising and cool
particles sinking in a gas and liquid is called____
Convection
Conduction
Radiation
hello bro please set instar
Plan an investigation to examine the relationship between the amount of gas
and its volume. Identify the materials and write a procedure, identifying the
constants and variables. Conduct the investigation and record your
observations.
I can’t think of anything to use for this experiment and we aren’t told what to use so if anyone had any ideas for that I would really appreciate it
Answer:
You will need a Kukushili pressure cooker for this experiment. This pressure cooker will allow you to compress the gases and observe its volume.
A gas cylinder contains exactly 1 mole of oxygen gas (o2). how many molecules of oxygen are in the cylinder? 4.01 × 1022 molecules 6.02 × 1023 molecules 9.03 × 1024 molecules 2.89 × 1026 molecules
The number of molecules of oxygen in the cylinder would be 6.022 x [tex]10^{23}[/tex]
Number of molecules of gasesAccording to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] molecules.
In this case, there is 1 mole of oxygen gas in the cylinder. Thus, following the established rule by Avogadro, there would be 6.022 x [tex]10^{23}[/tex] molecules of oxygen in the cylinder.
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Answer:
6.02 x10^23
Explanation:
i did the test
Molly inflates a beach ball to a volume of 8 liters in her air-conditioned house where
the temperature is 19°C. Later that day, Molly takes the beach ball to the beach. The
temperature at the beach was 33°C, and the air pressure at the beach is the same as
it was at the house.
What will happen to Molly's beach ball when she is at the beach?
The temperature at the air-conditioned house is 19° C. The temperature increases to 33° C in the beach. Molly's beach ball's volume will increase with increase in temperature.
What is the Charles law?Charles' law states that volume of gas increase with an increase in the temperature of the gas.
When pressure remain constant, if temperature increases, the volume of the ball will also increase.
Thus, Molly's beach ball's volume will increase with increase in temperature.
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3. Why do some reactions occur Nturally, and others do not?
Answer:
depends
Explanation:
because some are caused by different variables
17. Explain How is a change in oxidation number related to the process of oxidation and reduction?
Answer:
Explanation:
A change in oxidation number represents a transfer of electrons between atoms/ions. This is what happens during oxidation and reductions, where electrons are gained and lost (respectively).
Find the final temperature when 10 grams of aluminum at 130 c mixes with 200 grams of water at 25 c. assume no water is lost as water vapor. specific heat values (c) for aluminum= 0.901 j/g c and water 4.18 j/g c
Answer:
About 26.12 C°
Explanation:
Following q = mc∆t, assuming q is the same
(10g)(130 - T)(0.901j/g*c) = (200.0g)(T - 25)(4.18j/g*c)
T = 26.12
Question:
the initial pressure of a 4.0 l sample of helium gas is measured to be 12 atm.
if the pressure of the sample is reduced 3.0 atm, what is the resulting volume?
options:
a. 12l
b. 16l
c. 1.0 l
d. 9.0 l
Answer:
B
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Because n, R, and T remain constant, we can rewrite the equation as:
[tex]\displaystyle k = P_1V_1 = P_2V_2[/tex]
Where k is some constant. This form of the ideal gas law is referred to as Boyle's Law.
Substitute and evaluate:
[tex]\displaystyle \begin{aligned} (4.0\text{ L})(12\text{ atm}) & = (3.0\text{ atm})V_2 \\ \\ V_2 & = 16\text{ L} \end{aligned}[/tex]
In conclusion, the answer is B .
? Question
Given:
H₂ + Br₂ → 2HBr
Bond
Bond Energy
(kJ/mol
H-H
432
Br-Br
190
H-Br
362
Calculate the enthalpy change when hydrogen reacts with bromine.
Type the correct answer in the box. Express the answer to three significant figures e.
ΔΗ =
kj
Answer:-102
Explanation:The equation shows that 1 mole of H-H bonds and 1 mole of Br/Br vines are broken from 2 miles of H-Br bonds
Answer: -102
Explanation:
Predict and write the formulas for the two products of the reaction of aluminum metal al(s) with the copper(ii) chloride.
Answer:
Cu (s) and AlCl₃ (s)
Explanation:
This reaction can be classified as a single-displacement reaction, aka. a single-replacement reaction. These reactions involve one element swapping out another element in a compound. In this reaction, aluminum is taking the place of copper (ii) in the copper (ii) chloride compound. Aluminum takes the place of copper (ii) specifically because aluminum is more likely form a cation than anion. Copper (ii) serves as a cation in the compound.
Al (s) + CuCl₂ (s) --> Cu (s) + AlCl₃ (s)
The final products are copper (ii) metal and aluminum chloride. The metal of copper (ii) is produced instead of the cation in order to maintain the neutral charge balance of the reaction. The chorine has a subscript of 3 because aluminum usually forms cations of a +3 charge while chlorines form anions with a -1 charge.
The balanced equation is:
2 Al (s) + 3 CuCl₂ (s) --> 3 Cu (s) + 2 AlCl₃ (s)
Give the correct name for the structure in the image.
Answer:
2,5,6-trimethyloctane
Explanation:
1) Count the number of carbons in the longest chain. If the structure contains a functional group (e.g. double bond, -OH), they have to be part of the chain that you're counting.
• The straight chain is the longest chain, and it contains 8 carbons
• Without the additional 3 methyl (-CH₃) substituents, it would be called octane (since it is an alkane)
2) Assign location numbers for the substituents, ensuring that they are the lowest possible numbers
• From left to right, we could name it as 2,5,6-trimethyloctane
• From right to left of the parent chain, it would be called 3,4,7-trimethyloctane
• Assigning from left to right gives us the lowest location numbers as the sum of the numbers is 13 instead of 14
• Remember to add 'tri' since we have 3 methyl groups
102. What is the Pauli exclusion principle? What is Hund's rule?
Pauli Exclusion Principle is about quantum numbers of an atom. Hund rule is about how electrons are filled to the orbitals of an atom.
How is Hess's law used to calculate the enthalpy of a reaction?
A. The enthalpy is obtained from the difference in final and initial reactions in a path.
B. Enthalpies from similar equations are substituted for unknown reaction enthalpies. C. The final equation in a reaction path provides the enthalpy for the desired reaction.
D. The desired enthalpy is obtained through adding intermediate reactions together.
Considering the Hess's Law, the desired enthalpy is obtained through adding intermediate reactions together. (option D)
Hess's LawHess's law, also called Law can also be called Law of additivity of the enthalpies of reaction, it is a useful method when it is not possible to calculate the enthalpies of reaction from the enthalpies of formation, or in reactions in which the reaction enthalpy cannot be determined experimentally because it is very slow or very explosive.
Hess's law states that when reactants are converted to products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.
In this way, Hess's Law determines that when a chemical reaction can be expressed as an algebraic sum of other reactions, its reaction enthalpy is equal to the sum of the enthalpies of the partial reactions. In this way, it allows thermochemical equations to be treated as algebraic equations, and can be added, subtracted, or multiplied by a number to find the desired thermochemical equation.
SummaryHess's Law states that the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.
That is, the desired enthalpy is obtained through adding intermediate reactions together. (option D)
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part 1: name the type of chemical reaction that occurs when calcium hydroxide (ca(oh)2) reacts with
nitric acid (hno3).
part 2: explain why zinc (zn) would react with lead nitrate (pb(no3)2) but not with calcium chloride
(cacl2).
The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
What is a neutralization reaction?The term neutralization reaction refers to a reaction that occurs between an acid and a base that leas to the formation of salt and water only. The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
The reason why zinc will react with lead nitrate and not calcium chloride is because lead is less than zinc in the electrochemical series hence it can be displaced from solution.
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