Answer:
2 mExplanation:
The wavelength of a wave can be found by using the formula
[tex]\lambda = \frac{c}{f} \\[/tex]
where
c is the speed of the wave
f is the frequency
From the question
c = 5 m/s
f = 2.5 Hz
We have
[tex] \lambda = \frac{5}{2.5} = 2 \\ [/tex]
We have the final answer as
2 mHope this helps you
calculate the number of moles of ethanol acid in 30 cm³of 1 mol dm-³ solution
Answer:
May I assume "ethanol acid is just ethanol (it has one slightly acidic H atom). If so, the molar mass is 46.02 g/mole.
Explanation:
We have 30 cm^3 [30 ml] of 1.0 M (1 mole/liter) [1 dm³ = 1 liter].
That is 1 mole/liter. 30 ml would contain (0.030 liter)*(1 mole/1 liter) = 0.03 moles.
Calculate the energy of a photon of light emitted from a hydrogen atom when an electron falls from level n
Answer: E
1
−
E
4
=
Δ
E
=
−
2.18
×
10
−
18
J
(
1
n
2
f
−
1
n
2
i
)
=
−
2.18
×
10
−
18
J
(
1
1
2
−
1
4
2
)
=
−
2.18
×
10
−
18
J
(
15
16
)
=
−
2.04
×
10
−
18
J
After you obtain the energy, then you can realize that that energy has to correspond exactly to the energy of the photon that came in:
|
Δ
E
|
=
E
photon
=
h
ν
=
h
c
λ
where
h
is Planck's constant,
c
is the speed of light, and
λ
is the wavelength of the incoming photon. Thus, the wavelength is:
⇒
λ
=
h
c
E
photon
=
(
6.626
×
10
−
34
J
⋅
s
)
(
2.998
×
10
8
m/s
)
2.04
×
10
−
18
J
=
9.720
×
10
−
8
m
=
97.20 nm
Explanation:
What property determines whether an acid is a strong acid or a weak acid?
The dissociation of the ions
The total number of molecules
The pH of the acid
Answer:
the pH of the acid is the property that determines whether an acid is a strong acid or a weak acid
82. How many moles of calcium are in 3.82g of calcium?
given that the radiusof anion a2- is 0.290 nm, what would you expect the radius of a and a2+ to be
This problem is providing the ionic radius of an anion, A²⁻ as 0.290 nm and asks for that of the cation A²⁺ in comparison to the former.
Firstly, we need to recall the concept of ionic radius, as the distance between the nucleus and the outermost electron shell of an ion. In such a way, we can have two scenarios:
1. Anions result from the gain of electrons exhibited by a nonmetal, which means they turn out bigger than the neutral atom.
2. Cations result from the loss of electrons exhibited by a metal, which means they turn out smaller than the neutral atom.
With the aforementioned, we infer that the cation A²⁺, will me smaller than the anion A²⁻, which means it will have an ionic radius smaller than 0.290 nm.
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https://brainly.com/question/12026272https://brainly.com/question/19032815The majority of which type of dancing was created in African American communities? Tap Ballet Ballroom Swing. Plz help thx <3
Answer: if it’s a multiple choice then it should be swing dances
Explanation:While the majority of swing dances began in African American communities as vernacular African American dances, some influenced swing-era dances, like Balboa, developed outside of these communities.
How many eggs are in 3 dozen eggs? Use the dimensional analysis for this for practice.
Answer:
36 eggs
Explanation:
12 eggs in each carton
12 + 12 + 12 = 36 eggs
or 3 * 12 = 36 eggs
Hope this helps, have a nice day/night! :D
at 25°c the heat of fusion of aluminum is 10.6 kj/mol and the heat of sublimation is 326.4 kj/mol. what is the heat of vaporization of aluminum at 25°c?
The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.
The sublimation is the phase change of a substance from solid to gas, the fusion is the phase change of a substance from solid to liquid and the vaporization is the phase change of a substance from liquid to gas. The heat of vaporization is the difference between the heat of sublimation and the heat of fusion, that is to say:
[tex]h_{v} = 326.4\,\frac{kJ}{mol}-10.6\,\frac{kJ}{mol}[/tex]
[tex]h_{v} = 315.8\,\frac{kJ}{mol}[/tex]
The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.
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( i will give you brainliest who ever answers the question first and the right answer!!!)
What do you predict would happen if you brought a negatively charged balloon next to an uncharged piece of paper?
A. The balloon will attract the paper.
B. The balloon will repel the paper.
C. Nothing will happen.
D. The paper will repel the balloon.
Answer: A
Explanation:
Answer:
B. The ballon will repel the paper
Please help!! I don’t know what to do.
Answer:
C
Explanation:
No reaction because not enough moles of silver are present for the reaction to occur.
11. If a hypothetical element consisted of three isotopes in the following relative abundance, what would the atomic
mass of the element be?
30.00% 30.00 amu
50.00% 32.00 amu
20.00% 35.00 amu
A. 33.00 amu
B. 32.25 amu
C. 32.00 amu
D. 31.50 amu
E. 31.00 amu
Answer:
hiroghlipical
Explanation:
new word i just made
If an object absorbs all the light that hits it, the object appears to be
1. Which of these is an agent of chemical weathering?
copper patina
iron oxide
acid rain
iron
Answer:
Test answers
1. Water carving out a limestone cave
2. Oxidation
3. Acid rain
(Got 100%)
Explanation:
The primary agents of chemical weathering are water, oxygen and acids. So acid rain is an agent of chemical weathering. Option C is correct.
Which are the agents of chemical weathering ?Water, and many chemical compounds found in water, is the main agent of chemical weathering. One of the most abundant rock-forming minerals, chemically reacts with water and water-soluble compounds to form clay.
Water contains many weak acids such as carbonic acid. The primary agents of chemical weathering are water, oxygen and acids.
These react with surface rocks to form new minerals that are stable in, or in equilibrium with, the physical and chemical conditions present at the earth's surface.
Hence, option C is correct.
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A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies ________ L at 353 K and 2.00 atm.
Considering the ideal gas law, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.
Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P× V = n× R× T
In this case, you know:
P= 2 atmV= ?n= [tex]9.49 gramsx\frac{1 mole}{2 grams} = 4.745moles[/tex] being 2g/mole the molar mass of H2, that is, the amount of mass that a substance contains in one mole.R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 353 KReplacing:
2 atm× V = 4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K
Solving:
V = (4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K)÷ 2 atm
V= 68.67 L
Finally, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.
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https://brainly.com/question/4147359?referrer=searchResultsThis element has an atomic number lower than aluminum and is in group 14
Answer:
that is impossible. the atomic number can only go up each group
The same quantity of each solute is added to water. Which solution will have the greatest number of H30+ ions at equilibrium?
(1 point)
O weak acid
O strong acid
O strong base
O weak base
please help me
Type the correct answer in the box. Spell all words correctly.
What does Dalton's atomic theory propose?
A ______ causes rearrangement of atoms.
What's a suitable assumption for a simple distillation lab?
Answer:
Must be stable and relatively insoluble in boiling water.
Explanation:
it must be stable and relatively insoluble in boiling water and a must-have vapor pressure in boiling water that is of the order atmosphere at or more compound satisfy these conditions that will generally not separate from each other but we'll be separated from everything else.
Give one example of a pure substance.
Answer:
some example includes:
gold, copper, oxygen, chlorine, diamond
Explanation:
3. What must you have when you pray?
Answer:
when you pray you will feel a peace and happiness in your heart
how many moles of iron are present in 3.15 × 10^24 atoms of iron?
Answer:
5.23 moles
Explanation:
How many moles of iron are present in 3.15 × 10^24 atoms of iron?
1 mole has 6.02 X 10^23 particles
so
3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =
5.23 moles
How much mass does 1 mol of O2 gas have?
Answer: 15.99 x2g
Explanation:
What increases the concentration of H+ in water ?
Answer:
Acid
Explanation:
The difference between Physical/Chemical properties and Physical/Chemical changes
Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.
Which of the following correctly compares the radii of Na and Na+? (4 points)
Group of answer choices
Na has a smaller radius than Na+ because Na has expanded its electron cloud.
Na has a larger radius than Na+ because Na has lost its outermost energy shell.
Na has a smaller radius than Na+ because Na+ has expanded its electron cloud.
Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.
Answer:
D. Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.
Explanation:
The radius is larger because the diameter of Na+ is larger.
Sodium has smaller atomic radius than sodium cation because sodium has expanded electron cloud.
What is atomic radius?
Atomic radius is defined as the distance between outermost shell and the nucleus. Atomic radius varies across the periodic table where in groups it increases due to the fact that new shells are added on moving sown the group.
While in a period it decreases from left to right across the periodic table as electrons are added to the same shell which causes contraction of the atom.In case of comparison between an atom and a cation an atom has smaller atomic radius due to presence of electrons while in case of ions atomic radius is smaller as they have less number of electrons.
Atoms have expanded electron cloud while the electron cloud in case ions is small , the reason being the presence of large number of electrons in case of atoms and less number of electrons in case of ions.
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What is the relationship between Avogadro number, mole, and mass number?
What will be the primary result of the continuation of the
geologic processes indicated at this location?
Earth's magnetic field will reverse direction.
New oceanic crust will form.
o Continental crust will be forced downward.
Earth's circumference will increase.
Answer:
B
Explanation:
new oceanic crust will form.
The formation of a new oceanic crust will be the primary result of the continuation of the geologic processes. Therefore, option (B) is correct.
What is the oceanic crust?The oceanic crust can be described as the uppermost layer of the oceanic portion of the tectonic plates. The oceanic crust is composed of the upper oceanic crust, with pillow lavas complex, and the lower oceanic crust, made of troctolite, and ultramafic cumulates.
The oceanic crust lies above the rigid uppermost layer of the mantle. The crust and the rigid upper mantle layer together compose the oceanic lithosphere.
The oceanic crust is rich in iron and magnesium and composed of mafic rocks. It is thinner than the continental crust less than 10 Km thick but it is denser with 3.0 g/cm³ as opposed to the continental crust.
The oceanic crust displays a symmetrical pattern of positive and negative magnetic lines emanating from the mid-ocean ridge.
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Plz help I’m pretty confused on this question
Answer:
Bohr model A
Explanation:
It has more valance electrons therefore has more interaction between the atoms and has more electronegativity.
Four substances at the same temperature absorb equal
amounts of energy. The specific heat of the four
substances are listed below.
Substance
A. 1.45 J/g °C
B. 2.32 J/g °C
C. 0.98 J/g °C
D. 1.95 J/g °C
Which substance would show the GREATEST increase in
temperature?
A
B
C
D
Answer:
its that DDDDDD
Explanation:
i know this because its that DDDDDDDD
please anyone please this is due today!! help for a BRAINLIEST
For today's assignment, you need to balance and classify each of the following equations as synthesis, decomposition, single replacement, double replacement, or combustion.
Answer:
Explanation:
Im sorry all i know is that #3 is for sure combustion