Answer:
Robert Boyle
Explanation:
En muchos textos se suele considerar a Robert Boyle como el científico que introdujo en la Química un concepto de elemento diferente al empleado por los aristotélicos o por los alquimistas y que sirvió de antecedente al que formulara Lavoisier en 1789.
How many significant figures are in 0.005439
Answer:
Number of Significant Figures: 4
The Significant Figures are 5 4 3 9
Explanation:
Why doesn’t one-electron transfer from a hydrogen atom to another hydrogen atom?
Answer:
The electrons start to repel each other.
Explanation:
Most atoms attain a lower potential energy when they are bonded to other atoms than when they are separated. One is that the single electrons that each hydrogen atom possesses begin to repel each other. This repulsive force would tend to make the potential energy of the system increase.
¿Cuáles son las características que presentan las enzimas? Explica cada una
Answer:
Acelera las reacciones químicas.
Se requieren en cantidades mínimas.
Son muy específicos en su acción.
Se ven afectados por la temperatura.
Se ven afectados por el pH.
Algunos catalizan reacciones reversibles.
Algunos requieren coenzimas.
Son inhibidos por inhibidores.
Explanation:
Please help? It’s for chem
Answer:
O-H
Explanation:
It is polar covalent bond, because the hydrogen atom has electronegativity about 2.6, and the oxygen atom, electronegativity about 3.6. When the difference in electronegativity of the atoms is between 0.4 and 1.7, the result is a polar covalent bond.
How many moles are in 9.12 x 1023 molecules of sugar?
Answer:
519
Explanation:
.......................
What volume does 0.25 moles of oxygen gas occupy at STP ?
Answer:
[tex]\boxed {\boxed {\sf 5.6 \ L \ O_2}}[/tex]
Explanation:
We are asked to find the volume of 0.25 moles of oxygen gas.
At standard temperature and pressure or STP, one mole of any gas has a volume of 22.4 liters.
We want to convert 0.25 moles of oxygen gas or O₂ to liters. We will use dimensional analysis, so we must set up a conversion factor.
[tex]\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
We are converting 0.25 moles of oxygen gas, so we multiply the conversion factor by this value.
[tex]0.25 \ mol \ O_2 *\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
The units of moles of oxygen gas cancel.
[tex]0.25 *\frac {22.4 \ L \ O_2}{1 }}[/tex]
[tex]0.25 * 22.4 \ L \ O_2[/tex]
[tex]5.6 \ L \ O_2[/tex]
0.25 moles of oxygen gas occupy 5.6 liters at standard temperature and pressure.
type the max number of electrons that can be present in each shell or sub below
n = 5 shell __
n = 2 shell __
n = 2 l = 0 sub: __
n = 2 / 1 sub: __
3d sub: __
2s sub: __
5f sub: __
Explanation:
The maximum no. of electrons in a shell is given by. 2n^2 .
So for
n= 5 , 2× 5× 5 = 50
n=2 , 2×2×2 = 8
For a sub shell the maximum no. of electrons possible is given by 2(2l + 1)
So for n= l= 0
2 [(2×0) +1] = 2
for n=2 l=1
2 [(2×1) + 1] = 6
3d
d sub shell has l= 2 quantum number
Therefore 2[ (2×2) + 1] = 10
2s
s sub shell has l=0 quantum number
2 [(2×0) +1] = 2
5f
f sub energy level has l=3 quantum number
So 2[ (2×3) +1 ] = 14
The azimuthal quantum numbers for the sub shells are as follows
( s ---> 0
p----> 1
d----> 2
f ----> 3 )
Which describes an element?
A.They cannot be broken down any further.
B.They can combine with other elements to form atoms.
C.They were all discovered at the same time.
D.They were created in the Earth’s core.
Answer:
I think it's D one. Because all others are wrong
Answer: They can combine with other elements to form atoms.
Explanation:
True of False: The 8-Step Problem Solving Process was developed as an intended expansion of OODA Loop.
The 8-Step Problem Solving Process is vital to solving problems in an organized way and it's an extended form of OODA Loop. Therefore, it's logically true.
The 8-Step Problem Solving Process include the following:
Defining the problem.Clarifying the problem.Defining the goals.Identification of the root cause of the problem.Development of an action plan.Executing action plan.Evaluating the results.Continuous improvement.It should be noted that the 8-Step Problem Solving Process was developed as an intended expansion of the OODA Loop. Therefore, the statement is true.
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Chemistry help!!
A student conducts an experiment to separate water into hydrogen and oxygen as shown below.
As a result the student collects 28.0 g of hydrogen and 224.0 g of oxygen. How many grams water did the student originally have involved in the experiment
The student originally has 252 grams of water in this experiment.
LAW OF CONSERVATION OF MASS:
The law of conservation of mass explains that matter (mass) can neither be created nor destroyed but can be changed from one form to another. This means that in a chemical reaction, the sum of the masses of the reactants must equate to the total mass of product(s). According to this question, a student conducts an experiment to separate water into hydrogen and oxygen. The student collects 28.0 g of hydrogen and 224.0 g of oxygen. Since hydrogen and oxygen are the constituent elements of water, the sum of their masses must equate the mass of water. Therefore, 224g of oxygen + 28g of hydrogen = 252g of water.Learn more at: https://brainly.com/question/24996173?referrer=searchResults
33. Which element in Period 5 of the Periodic Table
is a transition element?
A) Sr
B) Ag C) Sb
D) Xe
Silver or Ag is the transition element present in period 5 of the periodic table.
What is periodic table?
Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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PLEASE HELP WILL MARK BRAINLIEST
Answer:
the answer is 150 in centimeters
Help ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:)
Correct:
Delivers Nutrients to cells Removes waste materials from cellsProtects the body from pathogensHelps cuts and wound to heal.Incorrect:
Brings carbon dioxide to cells for use.Carbon dioxide is the waste product of cells that you let out each time you breathe.
determine the element of lowest atomic number that contains a complete d subshell in the ground state.
Answer:
The element with the lowest atomic number that contains a complete d-subshell in the ground state is copper.Source:
Determine the element of lowest atomic number that contains a complete d subshell in the ground... - Study.commeasuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to _____ co2 levels over the last 200 years.
Answer:
measuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to the co2 levels over the last 200 years.
Explanation:
pa brainliest po ty
Violet light has a wavelength from 380 nm to 420 nm.
What velocity must a free electron have in order to exhibit the same wavelength as a violet photon with a
wavelength of 415 nm?
This question involves the concepts of de Broglie's wavelength and momentum.
The velocity of the electron must be "1754.27 m/s".
de Broglie's wavelength is a wavelength associated with a moving matter particle. It is connected to the momentum of the particle by the following formula:
[tex]P =\frac{h}{\lambda}\\\\mv=\frac{h}{\lambda}\\\\v=\frac{h}{m\lambda}\\\\[/tex]
where,
v = velocity of electron = ?
h = Plamk's Constant = 6.625 x 10⁻³⁴ J.s
m = mass of electron = 9.1 x 10⁻³¹ kg
λ = de Broglie's wavelength = 415 nm = 4.15 x 10⁻⁷ m
Therefrore,
[tex]v=\frac{6.625\ x\ 10^{-34}\ J.s}{(9.1\ x\ 10^{-31}\ kg)(4.15\ x\ 10^{-7}\ m)}[/tex]
v = 1754.27 m/s
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What has more atoms, a mole of carbon or a mole of fluorine?
A mole of carbon
A mole of Florine
They have the same number of atoms
Answer:
They have the same number of atoms
Explanation:
The mole (symbol: mol) is the base unit of amount of substance.
Think of mole meaning like inch. An inch of grass is the same as an inch of a flower. Mole is the standard measuring unit of atoms.
mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron. carbon. plastic. glass.
Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.
What is iron?The chemical element iron has the atomic number 26 and the symbol Fe. It is a metal that is found in group 8 of a periodic table and the first transition series. It makes up a large portion of the planet's outer or inner core and is the most prevalent element on Earth by mass, just ahead of oxygen.
It is the fourth most prevalent element in the crust of the Earth, having been mostly deposited by meteorites inside its metallic state, along with its ores. Iron ores must be processed in kilns or furnaces that may reach 5000 °C (2,730 °F) and higher, which is approximately 500 °C (932 °F) greater than the temperature needed to smelt copper. Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.
Therefore, mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.
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In your own words, explain why it is necessary to include only one chain-terminating/ synthesis-terminating nucleotide in each well of the electrophoresis instrument.
Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.
(its my own words, but i did search it to get this answer, hope it helps!)
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An atom of sodium has 11 electrons. Make a sketch of a sodium atom, showing how many electrons it has at each energy level. Infer how reactive sodium atoms are.
SOMEONE HELP ME PLEASE :(. I DONT GET IT :(
put these atoms in order of increasing radius: Na, Mg,Cl, P
Answer:
Cl < P < Mg < Na
Explanation:
Cl must have the smallest radius because it is located to the right of the remaining elements on the same row. P must have the second smallest radius because it is located to the right of the remaining elements on the same row. Mg must have the Third smallest radius because it is located to the right of Na on the same row. Therefore, Na has the Largest radius.
I hope it helps.
how can teh human body looose heat? (conduction, convecion, radiation) and WHY
Answer:
Radiation and conduction
Explanation:
The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam
Pls help me will give brainliest.
Where is convection happening on Earth?
A. Atmosphere
B. Earth's outer core
C. Earth's mantle
D. Oceans
E. All of the above I
Answer:
C. Earth's Mantle
Explanation:
Answer:
C
Explanation:
Earth's mantle is the correct answer
An element Argon has atomic number 18. Deduce the electronic configuration of the elements and suggest the group to which this element belong.
Answer:
8th or 0th group known as Noble gases
is this correct? ...
under the same conditions of temperature and pressure how does a liquid differ from a gas
A solution containing cacl2 is mixed with a solution of li2c2o4 to form a solution that is 2. 1*10^-5m in calcium ion and 4. 75*10-5 m in oxalate ion. What will happen once these solutions are mixed?\.
Answer:
the answer is d
Explanation:
i know
An iron object alloyed with cobalt rusts more quickly than a pure iron object. However, an iron object alloyed with manganese rusts less quickly than a pure iron object under the same conditions. This is true because: __________
a. cobalt is a stronger reducing agent than iron
b. iron is a stronger reducing agent than manganese
c. cobalt exhibits more metallic character than either iron or manganese in the iron-manganese alloy
Rusting is an electrochemical reaction. Iron rusts faster when alloyed with cobalt than when alloyed with manganese because, in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode
An alloy is a combination of two metals. There are various reasons for producing alloys such as greater tensile strength, corrosion resistance and improved aesthetic appearance.
When iron is alloyed with cobalt, the iron rusts faster than pure iron because iron is rendered the anode and cobalt is rendered the cathode. When the iron is alloyed with manganese, it rusts more slowly than pure iron because in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode.
Missing parts;
An iron object alloyed with cobalt rusts more quickly than a pure iron object. However, an iron object alloyed with manganese rusts less quickly than a pure iron object under the same conditions. This is true because
(1) cobalt is a stronger reducing agent than iron
(2) iron is a stronger reducing agent than manganese
(3) cobalt exhibits more metallic character than either iron or manganese
(4) in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode
(5) in the iron-cobalt alloy, cobalt is rendered the anode and iron is rendered the cathode
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Many plant cells have chloroplasts. Which process occurs in chloroplasts?
photosynthesis
respiration
food storage
reproduction
Answer:
photosynthesis
Explanation:
chloroplasts store sugar which is needed for photosynthesis
Which shows the general structure of a carboxylic acid?
O A. R
O-R
R
O R
B. R-O-R
C. R-OH
OD ROH
The general structure of a carboxylic acid is shown by option D.
In organic chemistry, a carboxylic acid is an organic acid that consists of a carboxyl group connected to an R-group. the overall components of carboxylic acid are R−COOH or R−CO₂H, with R referring to the alkyl, alkenyl, aryl, or other institution. Carboxylic acids arise broadly.
A carboxylic acid is a natural compound that incorporates a carboxyl group (C(=O)OH). the general formulation of a carboxylic acid is R–COOH, with R referring to the relaxation of the molecule. A carboxylic acid may be the concept of a mixture between functional corporations: an alcohol institution, related to hydrogen certain to oxygen, which attaches to a carbonyl institution, involving a carbon double sure to oxygen.
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