Answer:
See explanation
Explanation:
We can describe electrons using four sets of quantum numbers;
principal quantum number (n)
orbital quantum number (l)
magnetic quantum number (ml)
spin quantum number (ms)
Since no two electrons in an atom can have the same value for all four quantum numbers according to Pauli exclusion theory, for the orbitals given one possible value for each quantum number is shown below;
For 1s-
n = 1, l= 0, ml = 0, ms= 1/2
For 2s-
n= 2, l =0, ml=0, ms=1/2
For 1s and 2s orbitals, there is only one possible value for ml which is zero.
The force exerted by air on a moving object is called
Answer:
the force exerted by air on a moving object is called Air Resistance
Which solution conducts electricity?
O Salt Solution
O Sugar Solution
O Both
O Neither
how is geologic activity & geologic structure similar?
Explanation:
Geological activity determines geological structures. The prevalent types and forms of tectonic working in a place will control the form of structure that can be found in a terrain.
In volcanic region, it is common to see volcanic structures of different types such as calderas, strato-volcano etc. These structures are formed by the volcanic activities. Also, in a karst topography, we find sink holes, stalactites and stalagmites etc. due to the nature of the geologic activities going on. Some sedimentary rocks shows cross bedding due to the environment where they form.So, geologic activities controls the structure found in an area
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5. At which point is the sonar travel time going to be the shortest?
Answer:
okay ☺️
b. it's b
Explanation:
b
Based upon the context clues of the lesson, what do you think will be the relationship between Charles and his parents
O it will be deceitful and confusing
It will be apathetic and non-caring
It will be wonderful and loving
o it will be full of anger and fighting
Answer:
It is the first or second one. The other two didn't work for me.
Explanation:
Hope this helps :)
Answer:
It will be apathetic and non-caring
Explanation:
How many moles are there in 34.8 grams of Calcium?
Answer:
Number of moles = 0.87 mol
Explanation:
Given data:
Mass of calcium = 34.8 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of calcium = 40 g/mol
By putting values,
Number of moles = 34.8 g/ 40 g/mol
Number of moles = 0.87 mol
Identify the conjugate acid-base pairs. H2CO3 and H2O H3O and H2O HCO3 - and H3O H2CO3 and H3O HCO3 - and H2O HCO3 - and H2CO3
Answer:
Explanation:
H₃O⁺ and H₂O .
H₂O + H⁺ ⇄ H₃O⁺
H₂O accepts proton to form H₃O⁺ so H₂O is base .
H₃O⁺ ⇄ H₂O + H⁺
Here H₃O⁺ is acid because it gives proton ( H⁺ ) .
HCO₃ ⁻ and H₂CO₃
H₂CO₃ ⇄ HCO₃ ⁻ + H⁺
H₂CO₃ is acid because it gives proton ( H⁺ )
HCO₃ ⁻ + H⁺ = H₂CO₃
HCO₃ ⁻ is base because it accepts proton .
5.) A spring with a spring constant of 500 n/m is stretched 1 meter in
length. How much EPE does it have? *
500 Joules
250 Joules
1500 Joules
Answer:
250J
Explanation:
Given parameters:
Spring constant = 500N/m
Extension = 1m
Unknown:
Elastic potential energy = ?
Solution:
The elastic potential energy of a body is the energy stored within an elastic string.
EPE = [tex]\frac{1}{2}[/tex] k e²
k is the spring constant
e is the extension
Now;
EPE = [tex]\frac{1}{2}[/tex] x 500 x 1² = 250J
A Lewis structure is a two-dimensional representation of a molecule that does not necessarily show what shape that molecule would take in three dimensions. Based on the Lewis structure and your knowledge of VSEPR theory, approximate the smallest bond angle in this molecule.
..
x--------y--------x
..
Answer: The smallest bond angle in the molecule x-y-x is [tex]180^0[/tex]
Explanation:
According to VSEPR theory , each atom in a molecule will achieve a geometry that minimizes the repulsion between electrons in the valence shell of that atom.
In the given compound [tex]x-y-x[/tex], the number of electron pairs is 2 that means the hybridization will be [tex]sp^2[/tex] and geometry of the molecule will be linear as there are two bond pairs .The bond angle for linear geometry is 180° which reduces the electron electron repulsions and maximise stability.
Homework #1 Problem Set
DECAY KINETICS, EQUILIBRIUM, DATING
tor
the less
1. If 140Ba is freshly separated from a fission product mixture and found to contain 125
milliCi, (a) what is the activity of 14°La that will grow into the sample in 17.2 hr? (b)
What is the maximum activity of 140La that will ever be present in the sample, and (c)
when will it occur?
a. A=
Ti
T₂-T2
x Ap * (e-Azt – e-dzt)
A=
12.75 d
12.75 d -1.678
x 125 mCi x (e 306 h*17.2 h
In2
In2
e 40.272 h
x
17.2 ") = 31.38 mCi
b. A=
12.75 d
12.75 d-1.678
Inz
x 125 mCix (e 12.75 d*
x 5.65 d
In2
e 1.679 d
a *5.65 d) = 91.3 mci
c. tm = 1.4427 x
12.75 x 1.678 12.75
X In
12.75-1.678 1.678
= 5.65 days
the wa
2
A short-lived radioisotone
Pl help it’s for homwork
Explanation:
i know you mart... you go to my school
what is endothermic process?
Answer:
An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system. It may be a chemical process, such as dissolving ammonium nitrate in water, or a physical process, such as the melting of ice cubes.
4.Which sentence BEST describes the relationship between the plates in Earth's crust and the sizes of the landmasses on top of the plates?
A.The plates and the landmasses are approximately the same sizes.
B.The plates are much smaller than the size of the landmasses.
C.The plates are much larger than the size of the landmasses.
D. The plates are different in size from the landmasses.
Answer:
D. The plates are different in size from the landmasses.
Explanation:
The tectonic plates that are also called lithospheric plates are very massive and irregular-shaped rocks that are composed of both the continental and the oceanic lithosphere and they may vary from a few hundred to thousands of square km.13. Which statement about trace elements in our atmosphere is false?
O A. Elements that exists in small amounts in our atmosphere.
B. Elements that make up 1% -4% of our atmosphere.
O C. Elements that make up the 0.1% or less of our atmosphere.
D. Elements that include Methane, Neon, and Helium.
Answer: sorry I’m not sure
Odjri:
What is the concentration of a solution with a volume of 2.5 liters containing 600 grams of calcium phosphate?
Answer:
1.12M
Explanation:
Given parameters:
Volume of solution = 2.5L
Mass of Calcium phosphate = 600g
Unknown:
Concentration = ?
Solution:
Concentration is the number of moles of solute in a particular solution.
Now, we find the number of moles of the calcium phosphate from the given mass;
Formula of calcium phosphate = Ca₃PO₄
molar mass = 3(40) + 31 + 4(16) = 215g/mol
Number of moles of Ca₃PO₄ = [tex]\frac{600}{215}[/tex] = 2.79moles
Now;
Concentration = [tex]\frac{Number of moles }{volume }[/tex]
Concentration = [tex]\frac{2.79}{2.5}[/tex] = 1.12M
HELP HELP HELP
how are scientist using computer models to simulate worldwide ocean activity
Answer:
An ocean current is a continuous, directed movement of seawater generated by forces acting upon this mean flow, such as breaking waves, wind, the Coriolis effect, cabbeling, and temperature and salinity differences. Features like depth contours, shoreline configurations, and interactions with other currents also influence an ocean current’s direction and strength. Ocean currents flow for great distances, and together, create the global conveyor belt that plays a dominant role in determining the climate of many of the Earth’s regions (illustrated in the NASA video below). For example, the Gulf Stream makes northwest Europe much more temperate than any other region at the same latitude. Another example is Lima, Peru where the climate is cooler than the tropical latitudes in which the area is located, due to the effect of the Humboldt Current. Ocean modelling uses a mathematical model of the general circulation of an ocean, based on the Navier–Stokes equations on a rotating sphere with thermodynamic terms for various energy sources (radiation, latent heat). These equations are the basis for complex computer programs commonly used for simulating the atmosphere or ocean of the Earth.
Explanation:
Electron-dot diagrams Show all the electrons in an element?
Answer:
flase
Explanation:
i got the answer from khan
How many moles of Oxygen (O) are in 20.15x10^25 atoms of O?
Answer: 334.6 moles of O, 167.3 moles as O2
Explanation:
20.15x10^25/6.02214076x10^23 = 334.6 as atoms, 167.3 as O2
hi
Which is NOT something an organism must do to survive?
Question 2 options:
obtain energy to live
communicate verbally
maintain structure
produce offspring
Answer:
communicate verbally and maintain structure
Explain what would happen to the air temperature at Riverdale School over the course of the
day if the groundwater system were used. Use the terms stability and change in your
explanation (2 pts).
Answer:
In each Amplify Science unit, students figure out
a phenomenon by asking questions, gathering
evidence, and coming up with an explanation of how
the phenomenon works. The Coherence Flowchart
visually represents the storyline of the unit, showing
the coherent flow of questions, evidence, and ideas that
support students as they build complex explanations
of the unit’s anchor phenomenon. The Coherence
Flowchart on the following pages (one chapter per
page) can be used to see the connections between
the questions that drive students’ experiences, the
evidence they gather, the ideas they figure out, and the
new questions that those ideas generate. The diagram
to the right explains the structure of a chapter in the
Explanation:
How many molecules are there in 968 grams of H2SO4?
Answer:
5.7997
Explanation:
How many moles are equal to 157.8g of CaCl2?
Answer:
Explanation:
K: 157.8 g CaCl2
U: ? mol CaCl2
1Ca = 1(40.08) = 40.08
2 Cl = 2(35.45) =+70.90
110.98
157.8 g CaCl2 1 mol CaCl2
x
1 mol CaCl2 110.98 g CaCl2
What do we call living things that share characteristics including processes that make life possible?
Question 3 options:
chemical properties
structure
organisms
energy
How many moles of water are produced from 0.500 moles of oxygen gas?
Where do all of the elements heavier than Hydrogen come from?
A. They were always there.
B. They were forged inside of stars.
C. They were formed during the Big Bang.
D. They developed on Earth when it formed.
Question 4 of 5
In the suburbs, per capita consumption of fossil fuels is very high. What is the
most likely effect of this?
A. A decrease in nitrates in the soil
B. An increase in carbon dioxide in the atmosphere
O
C. An increase in phosphates in groundwater
D. An increase in oxygen in the air
SUBMIT
Answer:
B
Explanation:
Answer:
B. An increase in carbon dioxide in the atmosphere
Explanation:
Blue green and red are _____ colors of light ?
Answer: the
Explanation:
In determining the density of a rectangular metal bar, a student made the following measurements length 8 53 cm, width, 24 cm, height 10 cm, mass, 527064 g Calculate the
density of the metal to the correct number of significant figures
Answer:
d = 2.57456 g/cm³
Explanation:
Given data:
Length of metal bar = 853cm
Width = 24 cm
Height = 10 cm
Mass = 527064 g
Density of metal = ?
Solution:
Volume of metal bar:
Volume = length × width × height
Volume = 853 cm × 24 cm × 10 cm
Volume = 204720 cm³
Density:
d = m/v
d = 527064 g / 204720 cm³
d = 2.57456 g/cm³
How many atoms of each element are present in
Si (SO4)3 Ca(OH)2
3.2 moles of K2SO3
4 moles of oxygen
Answer:
1.156x10²⁵ atoms and 4.8x10²⁴ atoms of oxygen
Explanation:
1 mole of a molecule X contains 6.022x10²³ molecules. In a molecules as H₂O, for example, there are 3 atoms (2 of H and 1 of O).
Thus, in 1 molecule of K₂SO₃ there are 6 atoms (2 of K, 1 of S, 3 of O). In 3.2 moles there are:
3.2mol K₂SO₃ * (6.022x10²³ molecules / 1mol) = 1.927x10²⁴ molecules.
The atoms are:
1.927x10²⁴ molecules * (6atoms / molecule) =
1.156x10²⁵ atoms
In 4 moles of oxygen, O₂, there are 2 atoms per molecule :
4mol * (6.022x10²³ molecules / mol) = 2.4x10²⁴ molecules * (2atom / molecule) =
4.8x10²⁴ atoms of oxygen
Correctly order the steps necessary to calculate the mass of product formed in a chemical reaction, given the masses of all reactants. Start with the first step at the top of the list
↑↓ Place these in the proper order.
1. Identify the limiting reactant as the reactant that produces the least amount of product.
2. Determine the amount of product that could be formed from each reactant using the appropriate mole ratios.
3. To find the mass, multiply the number of moles of product formed (from the limiting reactant) by the molar mass of the product.
4. Determine the moles of each reactant present by dividing its mass by its molar mass
Answer:
Explanation:
Correct order is as follows .
1 ) Determine the moles of each reactant present by dividing its mass by its molar mass
2 ) Determine the amount of product that could be formed from each reactant using the appropriate mole ratios.
3 ) Identify the limiting reactant as the reactant that produces the least amount of product.
4 ) To find the mass, multiply the number of moles of product formed (from the limiting reactant) by the molar mass of the product.