Answer:
The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.
It is one of the factors affecting metamorphic rock which creates lineation.
Answer:
Pressures and temperatures
Explanation:
In deciding the new substances that develop in a metamorphic stone, pressures and temperatures are major factors. Under various conditions of pressure and temperature, various minerals form.
Metamorphic rocks are classified that, extreme heat and strain, have altered shape. Metamorphic derives from the terms meta and morph in german. Meta means alteration and morph means shape. So, to alter shape, we get metamorphosed significance.
. What is the density of a block of plastic if the volume of the block is 5 cm and the mass is 17.2 g?
Answer:
The answer is 3.44 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 17.2 g
volume = 5 cm³
We have
[tex]density = \frac{17.2}{5} \\ [/tex]
We have the final answer as
3.44 g/cm³Hope this helps you
PLEASE HELPPP!!!!!!!!
Explanation:
Label A: oceanic - oceanic
Label B: oceanic - continental
Label C: continental - continental
Answer:
Oceanic-continental convergence---- letter B.
Oceanic-oceanic convergence ---- letter A.
Continental-continental convergence ---- letter C
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I’m not good at chemistry
Answer:
λ = 5.56 × 10⁻³ m
Explanation:
You have to use the formula c = λv to solve the problem. Review what you are given. You are given v and c, where v = 5.40 × 10¹⁰ Hz and c = 3.00 × 10⁸ m/s. The value c is for the speed of light and is something you need to memorize. You will use it often in physics and sometimes in chemistry.
Now that you figured out what you know, you can see that there is only one unknown, allowing you to solve.
c = λv
λ = c/v
λ = (3.00 × 10⁸ m/s)/(5.40 × 10¹⁰ Hz)
λ = 5.56 × 10⁻³ m
How many electrons are located in the outermost orbit in the Bohr model of a boron atom?
A. 1
B. 2
C. 3
D. 4
According to the electronic configuration of boron, there are three electrons in the Bohr model of a boron atom.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Identify each term as a description of an electron geometry or a molecular geometry. Trigonal pyramidal for N F 3 Choose... Tetrahedral for N F 3 Choose... Arrangement of bonding and non-bonding electron domains Choose... Arrangement of only the atoms in a molecule Choose...
Answer:
electron geometry
Tetrahedral for N F 3
Arrangement of bonding and non-bonding electron domains
molecular geometry
Trigonal pyramidal for N F 3
Arrangement of only the atoms in a molecule
Explanation:
According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.
The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.
NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.
According to valence shell electron pair repulsion theory:The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
Electron geometry
Tetrahedral for NF₃
Arrangement of bonding and non-bonding electron domains
Molecular geometry
Trigonal pyramidal for NF₃
Arrangement of only the atoms in a molecule
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What atomic symbol completes this reaction?
ГРо
220
Po →
84
?
+
liei
O
224
Pb
82
04
2+
He
2
o
220
At
85
0 220
Rn
86
Answer:
Option C is correct = ₈₅At²²⁰
Explanation:
Given radioactive decay shows the beta emission.
²²⁰₈₄Po ₈₅At²²⁰ + ⁰₋₁e ⁻
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
Properties of beta radiations:
1) They can travel in air in few meter distance.
2) These radiations can penetrate into the human skin.
3) The mass of beta particle is smaller than the alpha particles.
4) The sheet of aluminium is used to block the beta radiation
¹⁴₆C → ¹⁴₇N + ⁰₋₁e ⁻
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
the commands given in nucleus are throughout the cell by the
A.endoplamic reticulum
B.Flagella
C.mitochondria
D.golgi bodies
E.vacuole
Answer:
A.endoplamic reticulum
Explanation:
The endoplamic reticulum is an important organelle in protein synthesis. The nucleus contains DNA, which is the template for transcription of mRNA. mRNA acts as a message, which leaves the nucleus to become translated into proteins.
The endoplasmic reticulum is important in the synthesis, folding, and modification of proteins.
Which of the following mixture can be separated by sedimentation?
A water and kerosene B. water and sand
C. water and sugar
D water and alcohol
hydrogen peroxide slowly decomposes into water and oxygen.the enthalpy change of reaction can be calculated using standard enthalpies of formation.Using a Hess cycle what is the enthalpy change of reaction for this decomposition
When warm air from a large body of water
Answer:
On a warm day, water absorbs from its warmer environment, lowering the air tempurature. On a cool night, heat is transferred from the water to its cooler environment, raising the air tempura
Explanation:
For the equation 2 HCI + Zn ⇒ H₂ +ZnCI₂ suppose you had 2.00 g HCI and enough Zn.
a. What mass, in grams, would you have of Zn?
b. How many grams of H₂ would be produced?
Please show your work!!
Answer:
Zinc weighs 65.38 grams per mole, so we’ve got 0.994 moles of zinc (I’ll worry about sig figs at the end). HCl weighs 36.46 grams per mile, so we’ve got 1.78 moles of HCl. However, two moles of HCl react with one mole of zinc. So only 1.78/2 = 0.890 moles of Zinc are going to react.
One mole of zinc produces one mole of hydrogen, which weigh 2.02 grams per mole. So 0.890 moles * 2.02 grams/mole means 1.90 grams of hydrogen will be produced.
Since we have 2 sig figs in the weights given, the answer should have 2 sig figs, thus 1.9 grams.
This is just an example
how much calcium chloride is required to make 1 Liter of a .10M solution?
Answer:
110.91 g of CaCl2
Explanation:
11.9 grams of CaCl₂ is required to make 1 Liter of 0.1M solution.
Calculating the amount of CaCl₂ required:
We first need to calculate the molecular weight of calcium chloride CaCl₂.
The atomic weight of Ca = 40.01
and the atomic weight of Cl₂ = 2×35.45 = 70.90
So, the molecular weight of CaCl₂ = 40.01 + 70.90 = 110.91
This means that 110.91 g of CaCl₂ mixed with enough water will produce 1Liter of 1M solution.
Now, to calculate the amount of CaCl₂ required to make 1 Liter of 0.1M solution we use:
grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter
= 0.1 × 110.91 × 1000 ÷ 1000
= 11.09 grams
So, 11.09 grams of CaCl₂ will be used.
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A substance is matter that is ____ and has a ____ composition?
Which group is the most reactive?
*
Alkaline Earth Metals
Alkali metals
Noble Gases
Lanthanides
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
When vinegar and baking soda are combined bubbles begin to form. Bubbles are evidence of a chemical reaction because they
Answer:
bubbled
Explanation:
its simple they bubbled
signs of chemical reactions are change of
odor
bubbles
solid turns liquid
liquid turns solid
change of color
(A) Hemoglobin is 50% saturated (P50) at 20 torr, which is approximately equal to the partial pressure of O2 in muscle. The partial pressure of O2 in the lungs is 100 torr. If the Hill coefficient nh = 3, calculate how efficient hemoglobin is at O2 delivery. Express your answer as the difference between factional O2 binding in the lungs and fractional O2 binding in muscle (qlungs – qmuscle). (B) How would the efficiency of O2 delivery change if hemoglobin were not cooperative (i.e. if nh =1)?
Answer:
Explanation:
Given that:
P₅₀ = 20 torr in muscle
The partial pressure of O2 in lungs Po₂ = 100 torr
The hill coefficient [tex]n_h[/tex] = 3
According to the Hill coefficient;
[tex]\dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{PO_2}{P_{50}})^n[/tex]
here;
[tex]\Upsilon[/tex] = fraction of haemoglobin monomers
[tex]\dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{100}{20})^3[/tex]
[tex]\dfrac{\Upsilon}{1-\Upsilon}[/tex] = 125 θ lungs
However for θ muscle :
[tex](\dfrac{PO_2}{P_{50}})^n=( \dfrac{20}{20})^3[/tex]
= 125 (θ lungs) - 1 (θ muscle)
= 124
B.
if nh =1
[tex]\mathtt {\theta \ lungs} = \dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{100}{20})^1[/tex]
[tex]\mathtt {\theta \ lungs} =5[/tex]
[tex]\mathtt {\theta \ muscle} = \dfrac{20}{20}^1[/tex]
(θ muscle) = 1
(θ lungs) - (θ muscle) = 5 - 1
(θ lungs) - (θ muscle) = 4
A) The efficiency of hemoglobin at O₂ delivery = 124
B) Efficiency of O₂ delivery will change by : 4
Given data:
Partial pressure of O₂ in lungs ( PO₂ ) = 100 torr
Partial pressure of O₂ in muscle = ( P₅₀ ) = 20 torr
Hill coefficient nh = 3
r = fraction of hemoglobin monomers
A) Determine the efficiency of hemoglobin at O₂ delivery
Given that Hill coefficient = [tex]\frac{r}{1-r} = (\frac{PO_{2} }{P_{50} } )^{n}[/tex]
= [tex]\frac{r}{1-r} = (\frac{100}{20})^{3}[/tex] = 125 ∅ Lungs
For Muscle :
[tex](\frac{20}{20} )^{3}[/tex] = 1 ∅ muscle
Therefore the efficiency of hemoglobin at 0₂ delivery
= ( ∅ lungs - ∅ muscle )
= ( 125 - 1 ) = 124
B ) Determine the change in efficiency of O2 delivery
when hill coefficient ( nh ) = 1
for lungs :
[tex]\frac{r}{1-r} = (\frac{100}{20})^{1}[/tex] = 5
for muscle :
[tex](\frac{20}{20} )^{1}[/tex] = 1
Therefore change on efficiency = ( 5 - 1 ) = 4
Hence we can conclude that The efficiency of hemoglobin at O₂ delivery = 124 and Efficiency of O₂ delivery will change by 4
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How would you prepare 250.0ml of 0.5 M solution from 6 M stock solution of NaCl?
Answer:
I would place 0.5 M solution of the 6.0 stock solution to a 250 mL volumetric flask and then add 250 mL of water.
Explanation:
Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed, and determine which order is likely for that reactant. Assume all other factors are held constant.
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially.
Choose...first order, second order, zero order
The reaction rate increases in direct proportion to the concentration of the reactant in solution.
Choose...first order, second order, zero order
The reaction rate is constant regardless of the amount of reactant in solution.
Choose...first order, second order, zero order
Answer:
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order
The reaction rate increases in direct proportion to the concentration of the reactant in solution -second order
The reaction rate is constant regardless of the amount of reactant in solution - zero order
Explanation:
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. The order of reaction is determined experimentally and not necessarily by inspection.
Typically, in a second order reaction, the rate of reaction increases in proportion to increase in concentration.
For a first order reaction, the rate of reaction increases exponentially as the increase in concentration.
For a zero order reaction, the rate of reaction is independent of the concentration of the reactant.
geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 3.89·gL−1. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 2.1·gL−1. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Be sure your answer has the correct number of significant digits.
Answer:
46%
Explanation:
When solving this problem we have to note that the amount of salt (in grams) before isolation and after isolation are equal. If [tex]V_1[/tex] represents its volume before isolation and [tex]V_2[/tex] its volume after isolation then:
[tex]2.1 \frac{g}{L} *V_1=3.89\frac{g}{L} *V_2\\\\\frac{V_2}{V_1} =\frac{2.1}{3.89}\\\\\frac{V_2}{V_1} =0.54\\\\This\ means\ after \ isolation\ the\ volume\ of water\ is\ 54\%\ of\ its\ original\ value.\\\\The\ amount\ of\ evaporation=1-\frac{V_2}{V_1} =1-0.54=0.46=46\%\\\\The\ amount\ of\ evaporation=46\%[/tex]
How can sediment be a bad thing??
Answer:
Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistence to disease, lowering growth rates, and affecting fish egg and larvae development.
Explanation:
Answer:
"Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistance to disease, lowering growth rates, and affecting fish egg and larvae development".
Explanation:
Pls, Help!!!!
When ionized, which of the following would become isoelectronic with argon?
Answer:
[tex]Cl^-[/tex]
Explanation:
Hello.
In this case, when chlorine gets ionized by gaining one electron it goes:
[tex]Cl^-[/tex]
Whose electron configuration is the same as argon:
[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]
Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.
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The graph below represents the relationship between the distance traveled and time elapsed for an object in motion.
During which interval is the speed of the object changing?
Group of answer choices
BC
DE
Answer:
DE
Explanation:
BC has a constant speed of 0, and DE does not have a consistent slope, therefore the speed is changing
The speed is defined as the rate of change of distance with respect to time.
In interval DE , speed of the object is changing.
Since, speed is defined as the rate of change of distance with respect to time.
[tex]v=\frac{dx}{dt}[/tex] , where x represent distance.
Slope of given graph represent distance, In interval BC slope is constant.
In interval, DE slope is always changing at each point.
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How many km are in a foot
Answer:
0.000305 km
Explanation:
1 foot = 0.000305 kilometers
Answer:
[\tex]\huge\bold\red{brainiest answer}[/tex]1 km =3,280.8398950131foot
Calculate the number of total atoms in 195 grams of Ni(OH)2. Use 6.022x10^23mol-1 for Avogadro’a number
195 g×
1 mol
Ni(OH)
2
92.71
g Ni(OH)
2
×
6.022×
10
23
formula units
mol
=1.27×
10
24
formula units of Ni(OH)
2
Since there are
5
atoms—one
Ni
atom, two atoms of
O
and two atoms of
H
—in each formula unit of
Ni(OH)
2
,
we multiply the number of formula units calculated above by
5
:
1.27×
10
24
formula units of Ni(OH)
2
×
5 atoms
formula unit of Ni(OH)
2
=6.33× 10^ 24 total atoms
The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex] is[tex]6.30\times 10^{24}[/tex] atoms
Explanation:
Given:
The 195 grams of nickel(II) hydroxide,[tex]Ni(OH)_2[/tex] .
To find:
The total number of atoms in 105 grams of nickel(II) hydroxide.
Solution:
The mass of nickel(II) hydroxide = 195 g
The molar mass of nickel(II) hydroxide = 92.708 g/mol
The moles of nickel(II) hydroxide:
[tex]=\frac{195 g}{92.708 g/mol}=2.10 mol[/tex]
According to the mole concept:
1 mole =[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex]
The number of molecules of nickel(II) hydroxide =
[tex]N=2.10 mol\times 6.022\times 10^{23} mol^{-1} =1.26\times 10^{24} molecules[/tex]
In 1 molecule of nickel(II) hydroxide there is 1 nickel atom, then in N molecules of nickel(II) hydroxide:
[tex]=1\times 1.26\times 10^{24} atom=1.26\times 10^{24} atoms[/tex]
In 1 molecule of nickel(II) hydroxide there are 2 oxygen atoms, then in N molecules of nickel(II) hydroxide:
[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]
In 1 molecule of nickel(II) hydroxide there are 2 hydrogen atoms, then in N molecules of nickel(II) hydroxide:
[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]
The total number of atoms:
[tex]=1.26\times 10^{24} atoms+2.52\times 10^{24} atoms+2.52\times 10^{24} atoms=6.30\times 10^{24} atoms[/tex]
The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex] is[tex]6.30\times 10^{24}[/tex] atoms.
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Which lists three parts of sunlight that make up some of the visible spectrum?
O green, blue, indigo
O infrared, red, orange
ultraviolet infrared, electromagnetic
violet, ultraviolet A ultraviolet B
Brainly if correct Hurry
Answer:
Its A
Explanation:
Green, blue, indigo lists three parts of sunlight that make up some of the visible spectrum. Hence option with green, blue, indigo is correct.
What is Electromagnetic Spectrum ?Electromagnetic spectrum is nothing but the range of wavelengths or frequencies on which electromagnetic radiation extend. it is whole distribution of electromagnetic waves according to frequency or wavelength. Electromagnetic wave is nothing but a photon which carries energy. Photon has frequency, wavelength as well as amplitude.
Electromagnetic spectrum is show in figure.
Range from 4000 angstrom to 7000 angstrom from violet to red respectively shows the visible light
Infrared light is nothing but the heat we feel from the sun. and ultraviolet light is blacked by ozone layer. we can calculate exact value of temperature of the sun rom Stephan's forth power law.
Green, blue, indigo, red and oranges are the colors from visible light, therefore they are part of visible light.
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Which of the following is NOT powered by alternating current?
A) household electrical outlets
B) power tools
C) toasters
D) batteries
Answer:
batteries
Explanation:
bc they're powered by energy
Describe what type of electron transfer happens between these two atoms.
Answer:
Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.
Explanation:
The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.
As we know, Ionic bonding is a type of chemical bonding characterized by the complete transfer of electrons from one atom to the other.The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.
As evident in the case above;
Mg, which is the electropositive element with 2 Valence electrons loses its Valence electrons to become Mg²+.O, which is the electronegative element with 6 Valence electrons, and consequently, only needs 2 electrons to complete it's octet.Ultimately, an ionic bond is formed between the Mg and O atoms.
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I need someone to help with the bonus.
Answer:
268.3 m/sec
Explanation:
What is gonna be the density of a block charger that is 22g and 210 cm3
Answer:
Control group
