Answer:
0.0866 M
Explanation:
answer key
The molarity of the NaOH solution has been 0.0865 M.
The neutralization reaction of the Phosphoric acid and NaOH results in the formation of sodium phosphate and water.
The balanced chemical equation can be given as;
[tex]\rm H_3PO_4\;+\;3\;NaOH\;\rightarrow\;Na_3PO_4\;+\;3\;H_2O[/tex]
Thus for the neutralization of 1 mole of Phosphoric acid, 3 moles of NaOH has been used.
The moles of phosphoric acid in 0.100 grams sample:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of phosphoric acid = [tex]\rm \dfrac{0.100}{99}[/tex]
Moles of phosphoric acid = 0.001 mol
For the neutralization of 0.001 moles of NaOH:
1-mole Phosphoric acid = 3 moles NaOH
0.001-mole Phosphoric acid =0.003 moles of NaOH.
The molarity of the NaOH solution:
Molarity = [tex]\rm \dfrac{moles}{Volume\;(L)}[/tex]
Molarity of NaOH = [tex]\rm \dfrac{0.003}{0.035}[/tex]
Molarity of NaOH = 0.0865 M
The molarity of the NaOH solution has been 0.0865 M.
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3. What must you have when you pray?
Answer:
when you pray you will feel a peace and happiness in your heart
This 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
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:
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
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
The 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.
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 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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Write a balanced chemical equation for the standard formation reaction of gaseous hydrogen bromide (hbr)
[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow HBr[/tex]
Balanced equation[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow 2HBr[/tex]
On reactant side:-
H=2Br=2On products side
H=2Br=2The balanced chemical equation for the synthesis of hydrogen bromide is [tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex].
What is a balanced chemical equation?The balanced chemical equation has been given as the reaction in which the number of atoms for each element on the product and the reactant side is equal.
The HBr has been formed with the reaction of the hydrogen and the bromine. The balanced chemical equation for the reaction has been:
[tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex]
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How much mass does 1 mol of O2 gas have?
Answer: 15.99 x2g
Explanation:
Two students, Janelle and Corey, are ready to test their designs.
Janelle made her solar oven by lining a piece of poster board with aluminum foil, shaping it into a cone, and placing it over a piece of black paper in an empty box. The food will go in a plastic sandwich bag on top of the black paper in the center of the cone. The image shows Janelle's cone oven.
cone shaped solar oven
Corey made his solar oven by lining the inside of a shoe box with black paper, placing a piece of plastic wrap over the bottom of the shoe box, and lining the lid of the box with aluminum foil. He used a pencil to prop the lid open at an angle. The food will go on the black paper under the plastic wrap. The image shows Corey's shoe box oven.
shoe box solar oven
Janelle's and Corey's designs both use aluminum foil, black paper, and either a plastic bag or plastic wrap. What is the purpose of each of these materials in the designs?
Anwser
my anwser is both will absorb and the will retain
Janelle made her solar oven by lining a piece of poster board with aluminum foil, shaping it into a cone, and placing it over a piece of black paper in an empty box. The food will go in a plastic sandwich bag on top of the black paper in the center of the cone. The image shows Janelle's cone oven.
cone shaped solar oven
Corey made his solar oven by lining the inside of a shoe box with black paper, placing a piece of plastic wrap over the bottom of the shoe box, and lining the lid of the box with aluminum foil. He used a pencil to prop the lid open at an angle. The food will go on the black paper under the plastic wrap. The image shows Corey's shoe box oven.
shoe box solar oven
Janelle's and Corey's designs both use aluminum foil, black paper, and either a plastic bag or plastic wrap so that means that they both absorb and they will retain and is u ever do it do not put it under a shave
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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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.
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
How could you break down the compound calcium carbonate into the elements that make it up ?
A. by melting
B. by crushing
C. with filter
D. with chemical changes
Answer:
A. By melting
Explanation:
You can break it down by thermal decomposition which is basically melting it and thats because many metal carbonates can take part in thermal decomposition reactions.
What are the consequences of increased nitrogen and phosphorus into water systems? (Site 3).
Answer:
But when there is too much phosphorus and nitrogen into water systems, it can speed up the process of eutrophication ( increase in the concentration of minerals and nutrients, which enhances the growth of algae, which causes algal blooms). Due to this, dissolved oxygen level is declined as not enough light penetrates in the water body.
Explanation:
A wave is moving towards shore with a velocity of 5.0 MS if it’s frequency is 2.5 Herz what is the wave length
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
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.
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.
The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.
Answer:
bacteria
Explanation:
The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.
How does energy move through a wave? 3 evidence and reasons supporting you answer.
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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Solve the following problems to determine the empirical formula. Show the complete
factors to calculate number of moles, then the molar ration and finally the empirical formula.
1. Calcium bromide is a compound used in photography and the manufactur of fire extinguishing
materials. Analysis of a 20.00 gram sample of calcium bromide yields 4,02 grams of calcium and
15.95 grams of bromine. Calculate the number of moles of both calcium and bromide, then
determine the mole ratio to write an empirical formula for calcium bromide,
The empirical formula of the compound (calcium bromide) is CaBr₂
From the question given above, the following data were obtained:
Ca = 4.02 g
Br = 15.95 g
Empirical formula =?Divide by their molar mass to obtain their mole
Ca = 4.02 / 40 = 0.1005 mole
Br = 15.95 / 80 = 0.199 mole
Divide by the smallest to obtain the mole ratio
Ca = 0.1005 / 0.1005 = 1
Br = 0.199 / 0.1005 = 2
Therefore, the empirical formula of calcium bromide is CaBr₂
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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.
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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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
Give one example of a pure substance.
Answer:
some example includes:
gold, copper, oxygen, chlorine, diamond
Explanation:
Can you use volume alone to predict whether an object will sink or float? Explain your answer
Answer:
Can volume alone be used to predict whether an object will sink or float? -No, you need both mass and volume to find its density to see if it can float.
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