Answer:
1s², 2s², 2p³
Explanation:
The atomic number of Nitrogen is seven. So it contains seven protons and seven electrons in neutral form. Also, the electronic configuration cited above contains seven electrons among which two electrons are present in first shell and five electrons are present in valence shell respectively.
Write the name of each numbered part of the eye.
a student is asked to draw an atom of sulfur on a board. the pictures below represents what the student drew. what is wrong with this sulfur atom
plzzzz help i need to finish up
What is it called when Earth’s magnetic poles change places?
a.
a strike-slip fault
c.
sea-floor spreading
b.
magnetic reversal
d.
continental drift
Answer:
Its b. Magnetic reversal
Explanation:
Answer:
B
Explanation:
i just did it
Which of the following is an example of a mixture?
A. NaCl
B. CO2 + H2 + O2
Ос. Са
D. C6H1206
Reset Selection
Answer:
B.
Explanation:
CO2 + H2 + O2 - are 3 individual substances.
What’s one renewable energy resource that can be used instead of fossil fuels ?
Answer:
Solar Energy & Wind Energy
Explanation:
These are renewable energy and can be used used in replacement for fossil fuels.
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How does a salt bridge improve a battery
The role of the salt bridge is to assure the neutrality of both compartments.
Explain how you could use Avogadro's Law given the grams of a known compound and volume.
According to Avogadro's law, volume is directly proportional to number of moles which is in relation with the grams of a compound.
What is Avogadro's law?
Avogadro's law is a gas law which states that the total number of atoms or molecules has a direct proportion to the volume occupied by a gas at a constant temperature and pressure.
It is closely related to ideal gas equation as it links temperature, pressure, volume and the amount of substance.It is given as, V∝n,
The straight line graph of volume versus moles is a straight line passing through the origin which implies that zero moles of gas occupy zero volume.The law was proposed by Amedeo Avogadro in year 1811.
The law can be derived from the assumption of kinetic theory of gases considering their ideal behaviour.
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Match each element to its electron dot diagram. The symbol X represents the element. Refer to the periodic table if needed. fluorine sodium phosphorus magnesium One of the X's didn't work, but it had 2 dots on top, 2 on the right, 2 on the bottom, and 1 on the left.
Answer:
The atom with one outer most electron is sodium
The atom with two outermost electrons is magnesium
The atom with five outermost electrons is phosphorus
Explanation:
A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.
Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.
Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.
Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.
Answer:
1 dot sodium
2 dots Magnesium
7 dot Fluorine
5 dot Phosphorus
Explanation:
could some please help me with this? thank you
Answer:
C
Explanation:
Oxidation occurs at the anode. That means the element's oxidation number should increase. Mg has an oxidation number of 0, but Mg2+ has an oxidation number of 2, showing it was oxidized.
What is the energy of light with a wavelength of 652 nm? (The speed of light in a vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J·s.)
O A 3.05 x 10-²⁸ j
O B. 3.28 x 10¹⁸ j
O C. 3.05 x 10-¹⁹ j
D. 3.28 x 10²⁷ j
A and C have negative exponents pleas help me
Answer:
C. 3.05 x 10⁻¹⁹ J
Explanation:
Given;
wavelength of the light, λ = 652 nm = 652 x 10⁻⁹ m
speed of light, c = 3.00 x 10⁸ m/s
Planck's constant, h = 6.626 x 10⁻³⁴J·s
Energy of electromagnetic wave is calculated as;
E = hf
where;
f is frequency of the light wave
f = c / λ
[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{hc}{\lambda} \\\\E = \frac{6.626*10^{-34}*3*10^8}{652*10^{-9}} \\\\E = 3.05*10^{-19} \ J[/tex]
Therefore, the energy of the light is 3.05 x 10⁻¹⁹ J
The correct option is "C"
C. 3.05 x 10⁻¹⁹ J
Answer:
Option C. 3.05 x 10¯¹⁹ J
Explanation:
Step 1:
Data obtained from the question.
wavelength (λ) 652 nm = 652x10^–9m
Velocity of light (v) = 3.00x10^8 m/s
Planck's constant (h) = 6.626x10^-34J·s
Step 2:
Determination of the frequency of the light.
The frequency can be obtained as follow
v = λf
3x10^8 = 652x10^–9 x f
Divide both side by 652x10^–9
f = 3x10^8 / 652x10^–9
f = 4.6x10^14s¯¹
Step 3:
Determination of the energy of the light wave.
This can be obtained as follow:
Planck's constant (h) = 6.626x10^-34J·s
Frequency (f) = 4.6x10^14s¯¹
Energy (E) =..?
E = hf
E = 6.626x10^-34 x 4.6x10^14s¯¹
E = 3.05 x 10¯¹⁹ J
Calcium nitrate, Ca(NO3)2 , is a(n) ___________________.
element
compound
heterogeneous mixture
homogeneous mixture
1. What is the wavelength of a photon of light with a frequency of 6.10 x 10^15 Hz?
Answer:
0.000000000000005 mm
Explanation:
The atomic number of an atom is
a) The mass of the atom
b) The number of protons added to the number of neutrons
c) The number of protons
d) Negatively charged
Answer:
b, the number of protons added to the number of neutrons
Explanation:
Ava’s best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects that she is allergic to cats but is unsure. What is the best thing for Ava to do next?
C) Test her suspicion by going to see an allergist to diagnose the allergy.
It's right
Match each situation below to a letter on the illustration.
Ball
starts
here
Letter
Situation
Potential energy is the highest
Losing kinetic energy, gaining potential energy
Kinetic energy is highest
Losing potential energy, gaining kinetic energy
Answer:a
Explanation:
In the position A, the potential energy is maximum and the kinetic energy is minimum. At the point B, kinetic energy is highest. At the point C, the losing kinetic energy, gaining potential energy and at D, losing potential energy, gaining kinetic energy.
What is kinetic energy ?Kinetic energy of moving body is the energy generated by virtue of its position. Potential energy is generated by virtue of its position at a height from the surface. When a body starts moving from rest, its potential energy starts convert to kinetic energy.
As the height increases, potential energy increases. When an object moves down, its acceleration due to gravity increases and more energy to fall down make its kinetic energy higher.
Thus, the situations can be matched as follows;
A, the potential energy is maximum and the kinetic energy is minimum. B, kinetic energy is highest.
C, the losing kinetic energy, gaining potential energy and
D, losing potential energy, gaining kinetic energy.
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hi:) why do acids produce hydrogen ions in aqueous solution?
Answer:
An acid produces hydrogen ions in aqueous solution because it reacts with the water molecules by giving a proton to them.
Explanation:
When hydrogen chloride gas dissolves in water to produce hydrochloric acid, the hydrogen chloride molecule gives a proton (a hydrogen ion) to a water molecule.
Answer:
Acids produce hydrogen ions in aqueous solution because they have a higher concentration of hydrogen ions than hydroxyl ions and that's the reason too why they have a lower pH.
Hope this helps.
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Answer : The value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The main chemical reaction is:
[tex]CH_4(g)+4Cl_2(g)\rightarrow CCl_4(g)+4HCl(g)[/tex] [tex]\Delta H_{rxn}=?[/tex]
The intermediate balanced chemical reaction are:
(1) [tex]C(s)+2H_2(g)\rightarrow CH_4(g)[/tex] [tex]\Delta H_1=-74.6kJ[/tex]
(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex] [tex]\Delta H_2=-95.7kJ[/tex]
(3) [tex]H_2(g)+Cl_2(g)\rightarrow 2HCl(g)[/tex] [tex]\Delta H_2=-184.6kJ[/tex]
Now we are reversing reaction 1, multiplying reaction 3 by 2 and then adding all the equations, we get :
(1) [tex]CH_4(g)\rightarrow C(s)+2H_2(g)[/tex] [tex]\Delta H_1=74.6kJ[/tex]
(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex] [tex]\Delta H_2=-95.7kJ[/tex]
(3) [tex]2H_2(g)+2Cl_2(g)\rightarrow 4HCl(g)[/tex] [tex]\Delta H_2=2\times (-184.6kJ)=-369.2kJ[/tex]
The expression for enthalpy change for the reaction will be,
[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3[/tex]
[tex]\Delta H_{rxn}=(74.6kJ)+(-95.7kJ)+(-369.2kJ)[/tex]
[tex]\Delta H_{rxn}=-390.3kJ[/tex]
Therefore, the value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ
How is the human hand different from the ape hand
Answer:
in explanation
Explanation:
Human hands are distinguished from apes by possessing longer thumbs relative to fingers.
Hope this helps!!!
Answer:
The human hand and primate hand both have finger prints and palm prints, or palmar whorls, but the prints differ. Human fingerprints have a higher ride density than primate fingerprints, which means the print ridges, or lines, are closer together. While the human’s prints are denser, primates usually have more lines overall.
Explanation:
I've learned this before
What do we call each step that makes up a reaction mechanism?
A. reaction step
B. individual step
C. Elementary Step
D. reactant step
Answer:
c elementary
Explanation:
they are formed and then created later
In the photoelectric effect, what happens when light hits the metal?
A. Electrons are knocked off atoms, causing electricity to flow.
B. Electricity is produced in the metal, causing light to be emitted.
C. Light is reflected off the metal, causing electrons to form.
D. Electrons are pumped into the metal, causing electricity to flow.
Answer: A. Electrons are knocked off atoms, causing electricity to flow.
Explanation:
Photoelectric effect is defined as emission or ejection of electrons from the surface of a metal when a light of certain frequency falls on the surface of the metal. Electrons emitted in this effect can be called photoelectrons.
The light which falls on the surface of the metal must be of sufficiently high frequency called as threshold frequency.
Thus light knocks off the electrons and thus the flow of electrons will result in the production of electricity.
Thus the correct option is Electrons are knocked off atoms, causing electricity to flow.
Which statement best describes what the density
of an object represents?
Density is the mass of an object per unit of
length.
Density is the volume of an object of a
certain mass.
Density is the length of an object for a certain
mass.
Density is the amount of matter in a certain
volume.
Answer:
d
Explanation:
edg2020
1. Identify whether each of the elements is a metal, non-metal, or metalloid:
Ruthenium: Neon:
Germanium: Neptunium:
Iodine: Strontium:
Cesium: Europium:
Answer:
neon - non metal
Explanation:
Answer:
Ruthenium → metalloidNeon → non-metalGermanium → metalloidNeptunium → metalIodine → non-metalStrontium → metalCaesium → metalEuropium → metalConsider the unbalanced equation for the oxidation of butene. C4H8 + 6O2 CO2 + H2O For each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?
two carbon dioxide molecules and two water molecules
four carbon dioxide molecules and four water molecules
two carbon dioxide molecules and four water molecules
four carbon dioxide molecules and two water molecules
Answer: Four carbon dioxide molecules and four water molecules
Explanation:
Answer:
D: four carbon dioxide molecules and two water molecules
Explanation:
There are four carbon dioxide molecules (CO₂) on the right side of chemical reaction, because there are four carbon atoms on the left side of balanced chemical reaction.
There are four water molecules (H₂O) on the right side of chemical reaction, because there are eight hydrogen atoms on the left side of balanced chemical reaction.
When potassium chromate (K2CrO4) is added to a solution containing 0.500 g silver nitrate (AgNO3), solid silver chromate (Ag2CrO4) is formed. a) Determine the theoretical yield.
Answer:
Theoretical Yield = 0.4882 grams
Explanation:
Potassium Chromate = K2CrO4 Molar mass: 194.1896 g/mol
Silver Nitrate = AgNO3 Molar mass: 169.87 g/mol
Silver(I) Chromate = Ag2CrO4 Molar mass: 331.73 g/mol
Potassium Nitrate = KNO3 Molar mass: 101.1032 g/mol
K2CrO4 + 2AgNO3 = Ag2CrO4 + 2KNO3
Potassium Chromate + Silver Nitrate = Silver(I) Chromate + Potassium Nitrate
Ratio 1:2 = 1:2
0.5g AgNO3
AgNO3 Molar mass: 169.87 g/mol
2AgNO3 = 339.74grams
0.5/339.74 = 0.0014717
Ag2CrO4 Molar mass: 331.73 g/mol
0.4882 grams
Theoretical Yield = 0.4882 grams
Name three group l bases and three group ll bases
Answer:
Group 1: LiOH, NaOH, KOH
Group 2: Ca(OH)2, Sr(OH)2, Ba(OH)2
Explanation:
Help!
A student dissolves 1 gram of sugar in 10 grams of water. She then determines the mass of the solution. What is the mass of the dissolved sugar and water?
a. less than 11 grams
b. more than 11 grams
c. 11 grams
d. It is not possible to tell from the data
Answer:
11 grams
Explanation:
How many kilograms of gasoline fill a 12.0-gal gas tank
Answer:
29.98kg
Explanation:
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg
29.98kg of gasoline fill a 12.0-gal gas tank
what is gasoline ?gasoline or gas or petrol a mixture of volatile, flammable liquid hydrocarbons which is derived from petroleum and used in many application like fuel in internal-combustion engines, solvent for oils and fats.
It is a by-product of the petroleum industry, used in automobile fuel due to its high energy of combustion and easily mix with air in a carburetor.
Gasoline is produced by distillation by separating the volatile substance, later on other designed process yield of gasoline from crude oil by splitting large molecules into smaller ones by cracking method.
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg of gasoline fill the tank.
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The government described in the passage most reflects the features of which type of democracy? No
The correct answer is B. Direct democracy
Explanation:
In a direct democracy, the citizens have a direct influence on government including laws, this means political decisions are made based on the opinion of citizens. This form of government differs from indirect democracy because in indirect democracy citizens only vote to choose representatives but do not participate directly in each political decision. The example presented is an example of direct democracy because even if some are not considered citizens, those who have the quality of "citizens" directly participate in the political decisions.
Balance the combustion reaction between octane and oxygen.
2C ₈ H ₁₈ + O ₂ → CO ₂ + H ₂ O
Answer:
The answer is 2C8H18 + 25O2 → 16CO2 + 18H2O .
(Correct me if I am wrong)
HURRY UP ANSWER MY QUESTION
Why does a balloon filled with gas become smaller when placed in a colder environment?
A.atoms / molecules speed up in the cold and thus push out on the balloon more
B.atoms / molecules slow down at lower temperatures and thus push out on the balloon less frequently and with less energy
C.atoms / molecules slow down in the cold and thus push out on the balloon more
D.atoms / molecules speed up in the cold and thus push out on the balloon less
Previous
Answer:
B
Explanation:
If you remeber a balloon in hot air, it pops. This is because the molecules are moving too fast and need more space to move, thus popping the balloon. If you put a balloon in cold air, then it shrinks, the molecules not moving fast enough and don't need as much space.