Answer:
Todos os três cientistas classificaram os elementos de acordo com o peso atômico.
Explicação:
As características da Tabela Periódica da Tríade Dobereiner são as seguintes:
1. é uma das classificações mais antigas de elementos.
2. nesta classificação, o peso atômico de um átomo é igual à média dos outros dois pesos atômicos.
3. é baseado no peso atômico.
Características do parafuso telúrico de Chancourtois
1. É a primeira classificação baseada no peso atômico.
2. foi a primeira representação gráfica dos elementos da tabela periódica.
Características da Lei das Oitavas de Newlands
1. também organizou os elementos de acordo com o peso atômico.
2. Em uma linha há apenas sete elementos e o oitavo vem abaixo do primeiro elemento devido às mesmas propriedades físicas e químicas.
The reaction NO2(g) + CO(g) → NO(g) + CO2(g) has been found to be second order with respect to NO2 and zero order with respect to CO. At a certain temperature, the rate constant is found experimentally to be 3.0 × 10−5 L mol · s . What is the rate of formation
Answer:
The answer is " [tex]122.88 \times 10^{-5}[/tex]"
Explanation:
In the given question some data is missing. so, the correct solution can be defined as follows:
Missing values:
[tex]k= 3.0 \times 10^{-5}\\\\NO_2 =6.4 \ mol / l \\\\CO= 4.1 mol / l \\\\NO= 5.2 mol / l \\\\CO_2= 1.3 mol / l\\[/tex]
Given equation:
[tex]NO_2(g) + CO(g) \longrightarrow NO(g) + CO_2(g)[/tex]
In the above equation, the rate is [tex]=k.[NO_2]^2[/tex] because the above given is the part of the second-order, which relates to [tex]NO_2[/tex]. In the zeros order the Carbon monoxide (CO) its reaction doesn't affect the rate.
Calculating the rate:
Rate [tex]=k.[NO_2]^2[/tex]
[tex]= 3.0 \times 10^{-5} \times 6.4^2\\\\=3.0 \times 10^{-5} \times 40.96\\\\= 122.88 \times 10^{-5}\\[/tex]
Students in physics class are asked to find the relationship between the length of a pendulum (string with a weight at the bottom) and the time it takes for one pendulum swing. What is the dependent variable in this experiment?
Answer:
1)[tex]Time \ for \ pendulum \ swing \ left \ and \ right = 2 \times \pi \times \sqrt{\dfrac{Length \ of \ the \ pendulum \ string}{g} }[/tex]
2) The dependent variable = The time it takes for one pendulum swing
3) The independent variable = The length of the pendulum string with weight at the bottom
Explanation:
The relationship between the length of the pendulum string and the time it takes for one pendulum swing is giving as follows;
[tex]T = 2 \cdot \pi \cdot \sqrt{\dfrac{L}{g} }[/tex]
Where;
T = The period of oscillation = The time to complete one oscillation =Two swings of the pendulum
L = The length of the pendulum
g = The acceleration due to gravity
Therefore, the time it takes for one pendulum swing is directly proportional to the square root of the length of the pendulum
The dependent variable = The time it takes for one pendulum swing
Th independent variable = The length of the pendulum string with weight at the bottom.
What effect do abiotic cycles have on ecosystems?
Abiotic cycles have a great impact on ecosystems. when the cycles occur more often, like the water cycle in the rainforest, the living organisms of the ecosystem respond appropriately since the organisms in the rainforest are adapted to the conditions of the abiotic cycles
Explanation:
Calculate the solubility of CaF2 in water at . You'll find data in the ALEKS Data tab. Round your answer to significant digits.
Answer:
[tex]0.016\frac{g}{L}[/tex]
Explanation:
Hello,
In this case, the dissociation of calcium fluoride is:
[tex]CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)[/tex]
And the equilibrium expression is:
[tex]Ksp=[Ca^{2+}][F^-]^2[/tex]
Which is useful to compute the molar solubility, symbolized by [tex]x[/tex] as the reaction extent:
[tex]Ksp=(x)(2x)^2[/tex]
In such a way, since the solubility product of calcium fluoride at 25 °C is 3.45x10⁻¹¹, the molar solubility is found to be:
[tex]3.45x10^{-11}=(x)(2x)^2\\\\x=\sqrt[3]{\frac{3.45x10^{-11}}{4} }\\ \\x=2.05x10^{-4}M=2.05x10^{-4}\frac{molCaF_2}{L}[/tex]
And the solubility, considering its molar mass 78.08 g/mol is:
[tex]=2.05x10^{-4}\frac{molCaF_2}{L}*\frac{78.08gCaF_2}{L}\\ \\=0.016\frac{g}{L}[/tex]
Regards.
Time Remaining: 1:27:31 If 50.0 g of H₂ and 100.0 g of O₂ react, how many moles of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g
Answer:
Explanation:
2 H₂(g) + O₂(g) → 2 H₂O(g
2 moles 1 mole 2 mole
50 g of H₂ = 50 /2 = 25 moles of H₂
100 g of O₂ = 100 / 32 = 3.125 moles of O₂
So oxygen is the limiting reagent .
3.125 moles of O₂ will react with 6.25 moles of H₂ to give 6.25 moles of H₂O .
Hence moles of H₂O produced = 6.25 moles .
what are the four rules for significant figures
Answer:
Significant Figures
Explanation:
1) Annotation category: ...
2)RULES FOR SIGNIFICANT FIGURES.
3) All non-zero numbers ARE significant. ...
4)Zeros between two non-zero digits ARE significant. ...
5)Leading zeros are NOT significant. ...
6)Trailing zeros to the right of the decimal ARE significant. ...
7)Trailing zeros in a whole number with the decimal shown ARE significant. 8) to make you happy :) hope this helps you :)
what kind of waves are water waves?
Explanation:
Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases.
Michael tells Sara he weighs 104 pounds. Sara says she is 44 kilograms. who is heavier?
Answer: Michael weighs more
Explanation: 44 kilos to pounds is around 97 pounds. hope this helps:)
my baby mama hates me, what do i do?
Answer:
Buy her food
Explanation:
food always helps bro. trust.
Answer:
Just talk to her , maybe you did something in the past to hurt her ? Remember to think about the baby and if doesn't work out try to be good co parents together.
Explanation:
Which describes a feature of synthetic polymers? They can be naturally decomposed. They can be cheaply recycled. They can only be made in small quantities. They can be produced at a low cost.
Answer:
The correct option is;
They can be produced at low cost
Explanation:
In comparison to several other manufacturing materials, some synthetic polymers such as plastics are more durable cost effective, flexible, faster to produce and reliable
With regards to the cost comparison, the resins used for plastic are cheaper to obtain than mining for materials such as metals. In all quantities, it is cheaper to produce and manufacture plastics than to produce metals.
Due to the light weight and corrosion resistance of plastics, it is cheaper to store and transport plastics to several locations with different environment without the plastic requiring much effort for transportation or being affected by corrosion.
Answer:
d
Explanation:
10) What are the four main spheres of planet?
Answer:
the four main spheres of the earth are geosphere, hydrosphere, atmosphere and biosphere
Explanation:
geosphere consists of all rocks on Earth
atmosphere which are the gases that surrounds the earth
hydrosphere which is all the water on the earth
biosphere which are the living things on the earth
An ion is neutral and has no charge. True or False
Answer:
Explanation:
False but I could be wrong but I’m pretty sure.
Answer:
False.
Explanation:
An ion has an imbalanced number of protons and electrons. Hope this helps! =)
hello! for titration method , why is alkali used instead of bases?
Your question has been heard loud and clear.
Uhm , Alkalis are just bases who react with water. In titration we use water also , so we need bases that react with water , and such bases are alkalis.
Alkalis are a type of bases.
Thank you
what is the safety rule that keeps ocean from being poisoned?
Answer:
Death in the Water: How Plastic Is Poisoning Our Oceans
Liz Greene February 17, 2017
We live in a society obsessed with convenience, and that obsession has made plastic king. Though humankind has greatly benefited from plastic, the environmental costs of this reigning polymer may bring about our downfall. Traveling from land to sea in the wind or through waterways, plastic pollution is causing extensive damage to our marine life and giving life to one of the greatest ecological disasters of our times.
Plastic has been collecting in the marine environment since plastic production began in the 1950s — in fact, each square mile of the ocean contains more than 46,000 pieces of floating plastic. Eight million metric tons of plastics make their way into the ocean each year, hitching a ride on the currents and reaching the furthest corners of our seas — even turning up in the Antarctic wilderness. Simply put, the world’s oceans are becoming a toxic soup of plastic and other debris, and all life is being negatively affected.
Unfortunately, plastic doesn’t biodegrade — though it does eventually photodegrade (i.e., break down into smaller fragments by exposure to the sun). Photodegradation of plastic continues to the molecular level, yet photodegraded plastic remains a polymer. No matter how minute the pieces, they will always be plastic. Unlike naturally based paper or glass, they are not absorbed into or changed by natural processes — plastic never truly goes away.
Explanation:
This is a really good article I found, hope it helps
zinc does not give hydrogen on reaction with nitric acid
Answer:
The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as NO2,NO etc.
Select the correct answer from each drop-down menu. An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be . If the atom instead gains 4 electrons, the net charge will be .
Answer:
If it loses to electrons the net charge will be +2. If the atom instead gains 4 electrons, the net charge will be -4.
Explanation: When an atom loses electrons( which are negatively charged), it turns into a cation. This means since there is more protons(which are positively charged) than electrons, the charge is positive. The charge is positive and than the number of electrons lost. It is the exact opposite for gaining electrons.
If all cells are created by other living cells, which of the following is true?
O Spontaneous generation cannot occur
O Plant cells come from other plant cells
O Cells divide for
reproduction
O All of the answers are correct
cells divide for reproduction
Hunter is copying an angle. His work so far follows. Explain the importance of his next step. Which is drawing A-line through A and Y using a straight edge
Answer:
its c ma man .
This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:
if your taking the quick check these were my awnsers
1.c
2.b
3.d
4.c
5 .A
for the copying an angle quick check only
Whats 243 daL converted to L
Number of liters (L) = 2430 L, 243 decaliters (daL) is equal to 2430 liters (L).
To convert 243 decaliters (daL) to liters (L), you need to use the conversion factor: 1 decaliter (daL) is equal to 10 liters (L).
So, to convert from daL to L, you can use the following equation:
Number of liters (L) = Number of decaliters (daL) × Conversion factor
Number of liters (L) = 243 daL × 10 L/daL
Number of liters (L) = 2430 L
Therefore, 243 decaliters (daL) is equal to 2430 liters (L).
To know more about conversion factor:
https://brainly.com/question/30567263
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Explain why a liquid can flow whilst a solid retains its shape.
Answer:
A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. It would take the shape of its container. Particles can move about within a liquid, they are packed densely enough that volume is maintained.
Explanation:
This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?
Answer: bright red light
Explanation:
im taking edge
the hypothesis can be accepted because the electromagnet with the longer cooper wire had great strength
I uh- I'm a bit confused- W h a t
What are the best titles a and b A science b pseudoscience
i don't really know what you are trying to say here, but what i think you are saying is what sounds like a more impressive job?? in my opinion, pseudoscience sounds more fancy and interesting. Since not a lot of people really knows what that is, it sparks conversation.
Answer:
https://brainly.in/question/5343031 use this link
Explanation:
According to the question;
A student takes notes in class as shown below. A. Uses an objective process Is updated constantly B. Is not objective Does not use a process Resists new information.
So the best titles for circumstances A and B will be :
Option C ;
A) characteristics of science because of the scientific methods used for notes taking
B) limitations of science because of the non scientific method or Science resistive methods used for notes taking
which of the following resources can replenish themselves by quick recycling and replacement , within a reasonable time , if managed properly?
plz say the answer with explanation
options
A. coal
B. soil
C. natural gas
D. sunlight
Answer:
B
Explanation:
Among all the answers soil is the only renewable resource.
Both coal and natural gas are a non-renewable resource
Even though sunlight can be used for solar panels as a renewable resource but when the sun dies out from burning there is no replacement for it.
Hence, only answer is soil
state two things you notice when a metal is touched
Answer:
touched touched
Explanation:
rusting can occure
sonority may take place
determine the rate of a reaction that follows the rate law: rate=k[A]m[B]n, where: k= 1x10-2 [A]=2 M B= 3 M m=2 n=1?
Answer:
0.12 molL‐¹ s‐¹
Explanation:
What is the meaning of electrolysis?
Answer:
A process in which a chemical change, especially decomposition, is brought about by passing an electric current through a solution of electrolytes so that the electrolyte's ions move toward the negative and positive electrodes and react with them.
Answer:
a pgsysyyssysyysysyshshshshshshshshshshshshshss
Can water stay liquid below zero degrees Celsius?
Which of the following is an example of an observation?
An observation is a major step in scientific experimentation that has to do with recording what is seen, heard, or felt.
What is observation?Observation is the process of acquiring information about phenomena using the sense organs.
Thus, one can observe by hearing, feeling, seeing, and record the outcomes accordingly.
Observation is a major part of the scientific method. Analysis of the information gathered from observation will enable scientists to come into proper conclusions.
More on observations can be found here: https://brainly.com/question/14897780
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Can u guys please answer this
What plasma looks like on the molecular level?