Answer:
British chemist John Newlands was the first to arrange the elements into a periodic table with increasing order of atomic masses. He found that every eight elements had similar properties and called this the law of octaves. He arranged the elements in eight groups but left no gaps for undiscovered elements.
Does dried coconut give blue black color when iodine solution is added in it.
Answer:
I cant give a 100% answer but it will give a black color when low starch
Explanation:
Iodine test is used to determine the presence of starch in food items. If iodine is added to any food item and it causes the food item to turn to a blue-black color
mark brainiest please
20 Ne + ºHe →
What element is made from this fusion reaction?
a. Magnesium-12
b. Magnesium-24
C. Chromium-12
d. Chromium-24
Answer:
c
Explanation:
because i did it
what is the OH- of {H+} = 4.0 x 10 to the power of -8
Answer:
At standard room temperature, [tex][{\rm OH^{-}] \approx 2.5 \times 10^{-7}\; \rm M[/tex] when [tex][{\rm H^{+}] = 4.0 \times 10^{-8}\; \rm M[/tex].
Explanation:
The following equilibrium goes on in water:
[tex]{\rm H_{2}O}\, (l) \rightleftharpoons {\rm H^{+}}\, (aq) + {\rm OH^{-}}\, (aq)[/tex].
The forward reaction is known as the self-ionization of water. The ionization constant of water, [tex]K_{\rm w}[/tex], gives the equilibrium position of this reaction:
[tex]K_{\rm w} = [{\rm H^{+}] \cdot [{\rm OH^{-}}][/tex].
At standard room temperature ([tex]25\; {\rm ^{\circ}C}[/tex]), [tex]K_{\rm w} \approx 10^{-14}[/tex]. Also, [tex][{\rm H^{+}}] = 4.0 \times 10^{-8}\; \rm mol \cdot L^{-1}[/tex]. Substitute both values into the equation and solve for [tex][{\rm OH^{-}}][/tex].
[tex]\begin{aligned} {[}{\rm OH^{-}}{]} &= \frac{K_{\rm w}}{[{\rm H^{+}}]} \\ &\approx \frac{10^{-14}}{4.0 \times 10^{-8}} = 2.5 \times 10^{-7}\end{aligned}[/tex].
In other words, in an aqueous solution at standard room temperature, [tex][{\rm OH^{-}] \approx 2.5 \times 10^{-7}\; \rm M[/tex] when [tex][{\rm H^{+}] = 4.0 \times 10^{-8}\; \rm M[/tex].
_____________is when the body is in an erect postion with feet slightly apart and your palms are facing forward with the thumbs pointed away from the body.
Answer:
anatomical position is the answer
If the cardboard square has a light on it what do observe
Answer:you observe the light?
Explanation:
¿Cómo se podría organizar un grupo institucional o comunal para contribuir en el cuidado de los recursos hídricos de la comunidad, de tal manera que se considere el impacto del cambio climático?
How could an institutional or community group be organized to contribute to the care of the community's water resources in a way that considers the impact of climate change?
La manera en la que se podría organizar un grupo institucional o comunal para contribuir en el cuidado de los recursos hídricos de la comunidad, es a través de la formación de Comités interinstitucionales que mitiguen el impacto del cambio climático.
> Primero que nada, es que exista la voluntad política entre cada una de las partes que conformarán el grupo institucional.
> Después, elegir a un Comité que presida las reuniones. Habría un representante gubernamental en ese Comité.
> En ese Comité estarán los líderes de cada agrupación representada.
> Establecer una agenda con los temas, las fechas y los objetivos que se desean conseguir.
> Tener la voluntad política de negociar abiertamente y no anteponer agendas personales y menos, intereses políticos.
> El gobierno tendría que reconocer la autorizad representativa de ese grupo para que realmente sus peticiones tuvieran un peso específico en la toma de decisiones.
> El gobierno debe asignar un presupuesto para que la agrupación pueda operar y en realidad fuera un grupo útil.
Podemos concluir que además del esfuerzo comunal y gubernamental, se podría considerar la participación de la iniciativa privada para fortalecer el presupuesto y los programas de acción para mantener limpios los recursos hídricos de la comunidad.
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The electron configuration of Be+2 is
O 1) 152 251
O2) 152
O 3) 152 2s2
O 4) 151
Answer:
the electron configuration is 1s22s2
Answer:
Electronic configuration is 1S²2S²
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A sample of iron oxide was found to contain 1.116 g of iron and 0.480 go foxygen. Its molar mass is roughly 5 times as great as that of oxygen gas. Find the empirical formula and molecular formula of this compound.
Answer: FeO2
Explanation:
1.116 g Fe
0.480 g O
We want to compare the NUMBER of Fe and O atoms. We only have their masses, but since the molar mass of Fe is 5 times that of O, let's multiply the grams of O by 5 to have it "catch up" to the iron in ternms of number of atoms. If the molar masses were the same, the masses would be in direct proportion to the formula. Since they aren't, multiply by the molar mass ratio:
(1.116 grams Fe) x 1 = 1.116 g Fe
(0.480 g O) x 5 = 2.40 g O [Changes the O mass into a number that correlates with the number of atoms relative to iron],
If the molar masses were the same, this would be the ratio of O to Fe atoms in the compound. Normalize to the Fe number by dividing both by 1.116:
Fe = 1
O = 2.15
Not perfect, but an empiricle formula of FeO2 makes sense. I don't see enough information here to prove that this is also the molecular formula, but FeO2 is a valid compound. Fe(IV)O2,
1. The empirical formula of the compound is Fe₂O₃
2. The molecular formula of the compound is Fe₂O₃
1. Determination of the empirical formula of the compound.
Fe = 1.116 g
O = 0.480 g
Empirical formula =?Divide by their molar mass
Fe = 1.116 / 56 = 0.02
O = 0.480 / 16 = 0.03
Divide by the smallest
Fe = 0.02 / 0.02 = 1
O = 0.03 / 0.02 = 1.5
Multiply by 2 to express in whole number
Fe = 1 × 2 = 2
O = 1.5 × 2 = 3
Therefore, the empirical formula of the compound is Fe₂O₃
2. Determination of the molecular formula of the compound.
Empirical formula = Fe₂O₃
Molar mass = 5 × molar mass of O₂ = 5 × 32 = 160 g/mol
Molecular formula =?Molecular formula = empirical × n = molar mass
[Fe₂O₃]n = 160
[(2×56) + (3×16]n = 160
[112 + 48]n = 160
160n = 160
Divide both side by 160
n = 160 / 160
n = 1
Molecular formula = [Fe₂O₃]n
Molecular formula = [Fe₂O₃] × 1
Molecular formula = Fe₂O₃Learn more: https://brainly.com/question/25591038
The energy required to remove the third electron from a dipositive ion is
The energy required is Ionization energy
Write 0.034 in scientific notation.
Answer:
0.034 = 34×10^-3
Explanation:
This is because the special point is notated until it goes in front of the first counting number
Scientific notation is a way of expressing numbers that are very large or very small in a compact and standardized format. 0.034 in scientifc notation is written as 3.4 × 10⁻³
In scientific notation, a number is expressed as the product of a coefficient and a power of 10. The coefficient is a decimal number greater than or equal to 1 but less than 10, and the power of 10 represents the magnitude of the number. The power of 10 indicates the number of places the decimal point must be moved to obtain the original number.
For example:
The number 4,500,000 can be written in scientific notation as 4.5 x 10⁶, where the coefficient is 4.5 and the power of 10 is 6.
The number 0.000043 can be written in scientific notation as 4.3 x 10⁻⁵, where the coefficient is 4.3 and the power of 10 is -5.
Scientific notation allows for easy representation of very large or small numbers and simplifies calculations involving these numbers. It is particularly useful in scientific fields where values such as distances, masses, and concentrations can vary over a wide range.
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Answer the following questions a. Define atom and molecules
Answer:
Molecules are neutral particles made of two or more atoms bonded together.
Atoms are single neutral particles.
The ability to conduct an electric current, dissolve in water (solubility) , and melt are _______________.
Group of answer choices
chemical bonding
physical properties
physical changes
chemical properties
Answer:
physical properties
Explanation:
conductivity, solubility, and melting/boiling points are physical properties as they can be determined without changing the composition of a substance
How many moles of sodium carbonate are contained by 57.3g of sodium carbonate
Answer:
[tex]\boxed {\boxed {\sf 0.541 \ mol \ Na_2CO_3}}[/tex]
Explanation:
We are asked to find how many moles of sodium carbonate are in 57.3 grams of the substance.
Carbonate is CO₃ and has an oxidation number of -2. Sodium is Na and has an oxidation number of +1. There must be 2 moles of sodium so the charge of the sodium balances the charge of the carbonate. The formula is Na₂CO₃.
We will convert grams to moles using the molar mass or the mass of 1 mole of a substance. They are found on the Periodic Table as the atomic masses, but the units are grams per mole instead of atomic mass units. Look up the molar masses of the individual elements.
Na: 22.9897693 g/mol C: 12.011 g/mol O: 15.999 g/molRemember the formula contains subscripts. There are multiple moles of some elements in 1 mole of the compound. We multiply the element's molar mass by the subscript after it, then add everything together.
Na₂ = 22.9897693 * 2= 45.9795386 g/mol O₃ = 15.999 * 3= 47.997 g/mol Na₂CO₃= 45.9795386 + 12.011 + 47.997 =105.9875386 g/molWe will convert using dimensional analysis. Set up a ratio using the molar mass.
[tex]\frac {105.9875386 \ g \ Na_2CO_3}{1 \ mol \ Na_2CO_3}[/tex]
We are converting 57.3 grams to moles, so we multiply by this value.
[tex]57.3 \ g \ Na_2CO_3} *\frac {105.9875386 \ g \ Na_2CO_3}{1 \ mol \ Na_2CO_3}[/tex]
Flip the ratio so the units of grams of sodium carbonate cancel.
[tex]57.3 \ g \ Na_2CO_3} *\frac {1 \ mol \ Na_2CO_3}{105.9875386 \ g \ Na_2CO_3}[/tex]
[tex]57.3 } *\frac {1 \ mol \ Na_2CO_3}{105.9875386 }[/tex]
[tex]\frac {57.3 }{105.9875386 } \ mol \ Na_2CO_3[/tex]
[tex]0.5406295944 \ mol \ Na_2CO_3[/tex]
The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we found that is the thousandth place. The 6 in the ten-thousandth place to the right tells us to round the 0 up to a 1.
[tex]0.541 \ mol \ Na_2CO_3[/tex]
There are approximately 0.541 moles of sodium carbonate in 57.3 grams.
1. Obtain Information Search for and watch an
online video clip that shows the lotus effect.
What do
you
think causes this phenomenon?
Answer:
up with you and the other day and I don't think I can get a chance
At stp,250cm3 of gas had a mass of 0.36g.what result does this give for the molar mass of the gas
Answer:
32,256g/mol
Explanation:
n= V/Vm
n = 0.25/22.4
n = 0.01
0.01 = 0.36/M
M = 0.36/0.01
Can someone please help me
(1) One night while looking through his telescope,
Reginald saw three planets in the sky. X, Y. and
Z. X was smaller than Y, and Y was smaller than Z.
Was Z larger or smaller than X?
Answer:
Z was smaller than X
Explanation:
if X<Y and Y<Z
therefore X<Z
What is the mass of carbon in 290 g of CO2?
Answer:
The mass of CO22 in total is 264 g.
The atomic mass for C is 12 g / mole.
The molar mass for CO22 is (12 + (2 × 16)) = 44 g / mole.
m C = (12 / 44) × 264 = 72 g
So, there are 72 g of C in 264 g of CO2
Explanation:
there's the answer have a good day.
Calculate the mass (in kg) of one golf ball
Answer:
0.04543 kg
Explanation:
try weighing a golf ball they are around 45.5 grams
What observations can you make about this group of people? Name one inference you can make from your observations.
Answer:
they are funny and unite.
Thank You
help please with this tough question
Answer:
option Boption AExplanation:
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sorry for asking for too much but me needs helppppp
Answer:
physical
Explanation:
Answer:
Physical property
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
In addition to how much force Earth exerts on the object, which features of an object affect its weight?
EEEE
O mass and location of the object
O shape and location of the object
O location of the object and how much energy the object has
O mass of the object and how much energy the object has
Answer:
mass of the object and how much energy the object has
Help. Explain if u can. If not just answer. I’m DESPERATE OK
Answer:
the signifigant figures would be 5
Explanation:
branilest pleass
5. Explain (melting, boiling, freezing, condensing) are considered physical properties.
Which piece of glassware is cone shaped (rest of question on image)
Glasswares are glass containers and objects. An Erlenmeyer flask is a piece of glassware that is cone-shaped except for a cylinder-shaped opening. Thus, option B is correct.
What is Erlenmeyer flask?Erlenmeyer flask has been commonly called titration or conical flask used in the laboratory to titrate the solution in an experiment. It was named after Emil Erlenmeyer, a German chemist. They are used to heat, cool, mix, titrate, and incubate processes.
They have a distinct shape with a round flat bottom and a narrow neck region that allows swirling and mixing of the solution without any spills. Its narrow opening accommodates the filter funnel that can be used for filtration.
Therefore, option B. Erlenmeyer flask (conical flask) is cone-shaped glassware.
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What is a mixture?
A.
two or more substances combined
B.
when a chemical reaction occurs and new
substances are formed
Answer:
A. two or more substances combinedExplanation:
As,
Mixture defines two or more substances that are physically combined with each other and are formed as solutions, suspension, and colloids
Why is cutting a piece of paper considered a PHYSICAL change?
A- even though the paper is in smaller pieces, each piece is still paper
B- cutting the paper causes it to change to a different substance, such as coal
Answer:
A
Explanation:
The answer is A
this apparently needs to be 20 characters long so there
Answer:
A - even though the paper is in smaller pieces, each piece is still paperExplanation:
Physical change - is a type of change in an object's physical look like: color, size, height. But it is still the same object and won't became into something.Example: Putting a red food coloring in the water.[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]
Write three hundred as a numerical value with 3 sig figs
Answer:
300
Explanation:
According to the question we are to leave our answer in 3 significant figures. Therefore, we leave our answer as 300.
Which of the following is an example of a mixture?
A. CO2 + H2 + O2
B. NaCl
C. C6H12O6
D. Ca
Explanation:
hey my name is barsha CO2 + H2 + 02
Which battle led to the mass displacement of Cherokee from their homes?
A.
Battle of Lindley's Fort
B.
Battle of Concord
C.
Battle of Yorktown
D.
Battle of Monmouth
Answer:
a. battle of lindleys fort
Explanation:
took the test :)
Answer:
Explanation:
edmedtum test, 100%
