Answer:
Old theories are dependent on primitive technology that was flawed, so new technology must be used.
Explanation:
The process of science is an unending process of inquiry into the nature of the universe. This inquiry into the nature of the universe is aimed at understanding of how things work and how the natural course of the universe can be exploited for man's good.
As new scientific evidences emerge, old theories are revised because we understand the world better, better technology is used to investigate nature in order to get a clearer view of natural phenomena.
Most old theories depend on obsolete technology, hence modern day sophisticated equipment must be used to correct the flaws of old theories.
Nickel is produced during stellar fusion.
O True
O False
1s2 2s2 2p6 3s2 3p6 Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed with magnesium, Mg, is..... (a) MgX (b) Mg2X (c) MgX2 (d) MgX3 (e) Mg3X2
The question is incorrect, the correct question is:
1s2 2s2 2p6 3s2 3p3
Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed
with magnesium, Mg, is
a. MgX
b. Mg2X
c. MgX2
d. Mg2X3
e. Mg3X2
Answer:
e. Mg3X2
Explanation:
Let us reexamine the electronic configuration of atom X; 1s2 2s2 2p6 3s2 3p3 .
This implies that it is a member of group 15 whose outer electronic configuration is ns2 np3. Members of group 15 have a valency of 3.
Therefore, during exchange of valence, the subscript of X becomes 2 (valency of magnesium) and the subscript of Mg becomes 3(valency of X).
Hence the formula is Mg3X2 as shown in the answer.
The branch of science which deals with chemicals and bonds is called chemistry.
The correct option is D.
The representation of electrons in their shell is called electronic configuration. To find the element we have to count the electrons in it.
The total number of electrons is 2+2+6+2+6 = 18 which is argon a noble gas element.
The valency of the magnesium is 3, Hence the compound they will make is[tex]MgAr_3[/tex].
Hence the correct option is D that is MgX3.
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El amoniaco se descompone en nitrógeno e hidrógeno, ambos en estado gaseoso. N=14 H=1 Calcula los moles de hidrógeno que se desprende en la descomposición de 68 g de amoníaco.
Answer:
Se desprenden 12 moles de hidrógeno.
Explanation:
Para saber la estequiometría de esta reacción, primero debemos escribir la ecuación y balancearla de tal modo que de ambos lados de la flecha de reacción haya la misma cantidad de átomos (ésta es la ley de conservación de la masa). Entonces tenemos:
[tex] 2 NH₃ (l) → N₂ (g) + 3 H₂ (g) [/tex]
Una vez que tenemos la reacción balanceada, pordemos observar que 2 moles de amoníaco se descomponen en un mol de nitrógeno y 3 de hidrógeno, respectivamente.
Sabiendo que la masa molar del amoníaco es 17 g, pasamos el valor de 68 g a moles de amoníaco:
17 g NH₃ ------- 1 mol
68 g NH₃ ------ x= 4 mol
Ahora que tenemos este valor en moles, podemos usar la estequiometría de la reacción para calcular cuántos moles de hidrógeno se desprenden:
1 mol NH₃ ------ 3 mol H₂ (dato teórico obtenido de la ecuación)
4 mol NH₃ ------ x= 12 mol H₂
Por ende, en la descomposición de 68 g de amoníaco (o lo que es lo mismo, 4 moles de amoníaco) se desprenden 12 moles de hidrógeno.
What is the atomic number of zirconium?
39
40
41
4
Answer: 40
Explanation: On your periodic table the number above the element(the number is still inside the box) is the atomic number. It is also the protons for that element. This applies to every element
amino acids are the building blocks of which class of macromoleculces
Answer:
proteins
Explanation:
amino acids are the monomers that make up proteins. amino acids bond together to form dipeptides, polypeptide chains, and eventually proteins.
What is a chemical bond?
A. An attractive force between 2 molecules
B. A gravitational force holding electrons in their orbits
C. An intramolecular force holding 2 atoms together
D. An electrostatic force betwipen a proton and an electron
Answer:
your answer is (C)
I hope it's helps you
Answer:
[tex]c)intermolecular \: force \: holding \: \\ two \: atom \: togather \\ thank \: you[/tex]
List all possible values of the magnetic quantum number ml for a 4p election
Answer:
-1, 0 and 1
Explanation:
The magnetic quantum number gives the number of possible spatial orientations or degeneracy of the orbitals in the subshells.
The number of possible spatial orientation is limited by the azimuthal quantum number.
For each value of azimuthal quantum number, there is a set of magnetic quantum number.
In the quantum number 4p;
the azimuthal quantum number = 1
The degeneracy becomes; -1, 0, 1
Complete the passage to describe velocity vs time graphs.
A velocity vs time graph is a graph that shows the relationship between the velocity of an object over time.
is plotted on the x-axis in seconds, and the
of the object is plotted on the y-axis in
meters per second.
Intro
Done
Answer:
20.6 kg
Explanation:
Answer:
20.6 kg
Explanation:
Which substance has the highest density at room temperature?
a.
Hydrogen
c.
Water
b.
Oxygen
d.
They are all the same
The correct answer is Water
Water is the most dense compound of all the mentioned ones. Hydrogen and Oxygen are gasses.
List the formal names and symbols for the four quantum numbers, their alternative names ( if applicable), and all possible values in the ground state of an atom
Answer:
See explanation
Explanation:
There are four sets of quantum numbers, they are;
1) Principal quantum number (n): The values of the principal quantum number ranges from 1 - ∞.
2) Subsidiary/azimuthal/orbital quantum number (l): The values of this set of quantum number ranges from 0-3 corresponding to s, p, d, f.
3) Magnetic quantum number (m): The values of the magnetic quantum number ranges from -l to +l.
4) Spin quantum number (ms): The values of spin quantum number are; -1/2 and +1/2
Which object has the most potential energy? A ball resting on the ground. A ball being thrown at 100 miles per hour. A ball on top of a refrigerator. A ball resting on the edge of a cliff.
Answer:
The correct option is a ball resting on the edge of a cliff.
Explanation:
A ball resting on the edge of a cliff is the correct option because it has the most potential energy and this is because potential energy is the energy stored by an object or energy posses by an object due it is position. It is the energy at rest.
A ball resting on the edge of a cliff indicate that the ball is a t rest, and it's possess energy base on its position relative to it's zero position.
Answer:A ball resting on the edge of a cliff.
Explanation:
should i nut in this hore
Answer:
which? gotta gimme a picture so i can answer
Explanation:
Answer:
yes ;)
Explanation:
in what two ways can you increase the elastic potential energy of a bucket of water sitting on a bench brainly
I NEED THE ANSWER NOW PLEASEEEEE!
What type of organic molecule is this?
Answer:
It's a lipid
Explanation:
have a good day, good luck!
How do you know that K, an alkali metal is very reactive?
a. It conducts heat
b. It conducts electricity
C. It is a soft and shiny metal
d. It contains one valence electron
Answer:
it contains one valence electron
The half-life of tritium (31H) is 12.3 years. If 57.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 49.2 years? mg
Answer:
3.57 mg
Explanation:
The following data were obtained from the question:
Half life (t½) = 12.3 years
Original amount (N₀) = 57.0 mg
Time (t) = 49.2 years
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
Half life (t½) = 12.3 years
Decay constant (K) =.?
K = 0.693 / t½
K = 0.693 / 12.3
K = 0.0563 /year
Finally, we shall determine the amount remaining after 49.2 years as shown below:
Original amount (N₀) = 57.0 mg
Time (t) = 49.2 years
Decay constant (K) = 0.0563 /year
Amount remaining (N) =?
Log (N₀/N) = kt / 2.303
Log (57/N) = (0.0563 × 49.2) / 2.303
Log (57/N) = 2.76996 / 2.303
Log (57/N) = 1.2028
Take the anti log of 1.2028
(57/N) = anti log (1.2028)
57/N = 15.95
Cross multiply
57 = N × 15.95
Divide both side by 15.95
N = 57 / 15.95
N = 3.57 mg
Thus, 3.57 mg of the nuclide will be remaining after 49.2 years.
plz choses one of the answer choices
Answer:
B
Explanation:
It adds so there are 4 aluminum on both sides as well as 6 oxygen on both sided.
Answer:
B. would be the correct option.
Explanation:
To balance the equation, both the reactant and product must have the same number so with 4Al+30 with two on the bottom, you would get a total of 4 Al atoms and 6 O atoms. Now, the other side must have 4 Al atoms and 6 O atoms, so multiply them by 2 and that would be your answer.
Calculate the wavelength and energy of light that has a frequency of 1.5 x 10^15 Hz.
The study of chemicals is called chemistry.
The correct answer is [tex]2*10^{-7}[/tex]
All the data is given in the question, the data is as follows:-
Frequency is[tex]1.5*10^{15}[/tex]The formula that will be used in the question is as follows:-
[tex]Wavelength=\frac{c}{v},[/tex]
c=speed of lightv=frequency
After putting the value, the wavelength is as follows:-
W[tex]=\frac{3 * 10^8}{1.5 * 10^{15}}[/tex]
The W=[tex]2 * 10^{-7[/tex]
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About two centuries ago Ben Franklin showed that 1 teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0x10^4 m^2 = 2.47 acres, and that there is approximately 5 cm^3 in a teaspoon, what is the thickness of the layer of oil?
Answer:
Explanation:
2.47 acre = 10⁴ m²
.5 acre = .2024 x 10⁴ m²
= 2024 m²
volume of oil = 5 x 10⁻⁶ m³
If thickness be t
volume of oily layer = area x thickness
= 2024 x t = 5 x 10⁻⁶
t = 5 x 10⁻⁶ / 2024
= 2.47 x 10⁻⁹ m
= 2.47 nm .
mark brainlest if right
Answer:
The answer is 1
Explanation:
I got this answer right.
Which of the following elements has the highest electronegativity?
A.
Boron (B)
B.
Carbon (C)
C.
Oxygen (O)
D.
Nitrogen (N)
Answer:
C. Oxygen
Explanation:
By looking at the periodic table.
As you look from left to right of the periods the electronegativity increases.
As well as from the bottom to the top of the groups it increases.
Which of these elements has stronger
metallic characteristics than aluminum?
1) He
2) Mg
3) Ga
4) Si
Answer:
Answer is 2) Mg
Explanation:
Mg has a some metallic characteristic that might be stronger than aluminum if you see it on the periodic table or on a computer
Balance the following equation: H2O(l) → H2 (g) + O2 (g)
Answer:
2 H2O(l) → 2 H2(g) + O2(g)
Explanation:
H2O(l) → H2 (g) + O2 (g)
Add 2 to both sides:
Reactants: Products:
H: 2+2=4 H: 2+2=4
O: 1+1=2 O:2
2 H2O(l) → 2 H2(g) + O2(g)
Therefore it is balanced, hope this helps.
When water changes to water vapor it goes through ______. A) the chemical change evaporation B) the heat change evaporation C) the physical change evaporation D) the conduction change evaporation
Answer:
C) the physical change evaporation
Explanation:
Physical change: The term "physical change" is described as a change that occurs in the physical properties of a particular substance. The physical properties of a specific substance include shape, texture, mass, flexibility, color, and density, etc. Mostly, physical changes are considered as reversible.
In the question above, the water changes to water vapor. In this case, the evaporation process of water will be considered as a physical change. The water changes into the gas state from a liquid state while evaporation.
describe the role of a geographer
Answer:
Answer Below
Explanation:
Geographers use maps and global positioning systems in their work. Geographers study the Earth and the distribution of its land, features, and inhabitants. They also examine political or cultural structures and study the physical and human geographic characteristics of regions ranging in scale from local to global.
answer:
a geographer uses maps and global positioning systems in their work to study the earth and the distribution of its land & features & inhabitants and to examine political or cultural structures ranging in scale from local to global.
explanation:
that's the role of a geographer
i answered your question & hope you have a great day!
pls give me brainliest <3
A gas is composed of individual particles which are in constant?
Answer:
Gases consist of particles (molecules or atoms) that are in constant random motion. Gas particles are constantly colliding with each other and the walls of their container. These collisions are elastic; that is, there is no net loss of energy from the collisions.
Explanation:
hope it helps
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
a. In, 49 protons, 49 electrons
b. Zn, 30 protons, 60 electrons
c. F, 19 protons, 19 electrons
d. Cs, 55 protons, 132.9 electrons
In the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly in In, 49 protons, 49 electrons. option A is correct.
What are protons and electrons?The protons contain the maximum mass of any atom or molecule they are present at the nucleus of the atom as the mass is focused at the center only they are positively charged species and greater in mass as compare to electrons.
Electrons are the negatively charged species and they rotate at the given shells or orbits around the nucleus they are negligible in mass as compare to protons but can effect the size of any element.
To specifies the size of an atom the number of protons and electrons of every atom in the periodic table is same.
Therefore, the number of protons, and the number of electrons given correctly in In, 49 protons, 49 electrons. option A is correct.
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A farmer dug a well but did not find any water.
Which most likely explains why the farmer did not find water?
Answer:
The bottom of the well is in an impermeable layer capping an aquifer. All layers underground are impermeable and there is no saturated zone.
Explanation:
;-)
Answer:
The answer is A
Explanation:
What mass does 2.41 moles of copper have?
A 632 g
B 280 g
C 153 g D 352 g
E 820 g
The largest element with electrons in two energy levels?
Answer:
alkaline earth metals
Explanation:
group 2A elements are the alkaline earth metals they have two electrons in the outermost energy level because their electron consideration ends in s2. you can add me and I'll help more please give me Brandy is I'm trying to move up I need two more to move up and I'll help you anytime I can