Answer:
14) A. amount of rain
15) C. amount of growth
16) B. no rainfall
Explanation:
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Paper for my last question
Please help I’m desperate giving 50 points and brainliest
Answer:
check explaination
Explanation:
Q. 4:
a) 7 ml
b) 9 ml
c) volume of rock = volume of column (with rock in it) - volume of column (without rock)
= 9-7
= 2 ml
d) density = mass ÷ volume
therefore, mass = volume × density
= 2 × 3 => 6 g
Q. 5:
1st has the highest density
this is because, density = mass ÷ volume
as volume is constant , density is directly proportional to mass
as image 1 has more number of molecules, it's mass will be maximum.
therefore, 1st image will have maximum density
What is the name of this atom's model that is commonly used by
Chemistry students to show the basic structure of an atom?
"Plum Pudding model" by JJ Thomson
"Bohr's Model" by Neils Bohr
"Rutherford's Model" by Ernest Rutheforf
Answer:
It is the "Bhor's Model"
Explanation:
Nearly two-thirds of the students ranked the electron cloud and Bohr-model as their two most preferred representations. Students invoked ideas from classical mechanics to interpret the electron cloud model and used probabilistic language to describe the Bohr model of the atom.
What is the approximate energy of a photon having a frequency of 4 x 10^7 Hz? (h = 6.6 x 10^-34 J . s)
Answer:
2.64 ×[tex]10^{-26}[/tex] J
Explanation:
I think you should mark it a physics question instead but anyway.
---------------------------------------------------------------------------
The Planck equation should be applied:
E = hv , while E is energy of proton; h is Planck constant; and v is frequency.
E = 6.6 × [tex]10^{-34}[/tex] × 4 × [tex]10^{7}[/tex]
= 6.6 × 4 × [tex]10^{-27}[/tex]
= 2.64 ×[tex]10^{-26}[/tex] J
which model best shows the movement of oxygen during photosynthesis
if it were a very hot day , how would the speed at which we smelled the perfume change ? what about a very cold day ? why ?
Explanation:
On a hot day, the speed at which we perceived the smell of the perfume will be much faster due to the increase in kinetic energy of the perfume molecules.
Based on the kinetic molecular theory of gases, the average motion of particles increases as their thermal energy increases. On a hot day, the heat causes an increase in the average kinetic energy of the particles and the perfume molecules moves faster.
On a cold day, the molecules are slower and the rate at which we perceive the perfume smell is very slow. The particles will diffuse less faster and this is due to the low average kinetic energy they possess.
What is the electron configuration for zirconlum?
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^2
Explanation:
Compared to the valence electrons of a nonmetallic atom, the valence electrons of a metallic atom are generally A) greater in number and less strongly held B) fewer in number and less strongly held C) fewer in number and more strongly held D) greater in number and more strongly held
Answer:
B) fewer in number and less strongly held
Explanation:
If we look closely at the periodic table from left to right, we will notice that the number of valence electrons increases steadily as we move across the periodic table from left to right.
Metals are mostly at the left hand side of the periodic table while nonmetals are found at the righthand side of the table.
Metals are less electronegative than nonmetals and typically have a lower effective nuclear charge than nonmetals hence the fewer valence electrons of metals are less strongly held(due to less effective nuclear charge) than those of nonmetals.
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called _____ energy. This quantity is a measure of bond strength since the stronger the bond, the _____ the amount of energy required to break it.
Answer:
Nuclear Binding Energy (Bond Energy), Higher (Greater)
Explanation:
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called Nuclear Binding Energy (Bond Energy). This quantity is a measure of bond strength since the stronger the bond, the Higher (Greater) the amount of energy required to break it.
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called bond energy. This quantity is a measure of bond strength since the stronger the bond, the greater amount of energy required to break it.
I hope this helps!
The standard cell potential for : 3A(s) + B+3(aq) → 3A+(aq) + B(s) is E° = 2.00 V. How does Ecell compare to Eo when [A+] = 0.50, [B3+] = 1.5 x 10-3 at 298 K.
E cell = 1.962 V
Further explanationGiven
E° cell = 2.00 V
Required
E cell at 298 K
Solution
The potential cell for nonstandard conditions we can use the Nernst equation
[tex]\rm E = E ^ o -\dfrac {RT} {nF} lnQ[/tex]
For temperature T = 298 K,
[tex]\rm E = E ^ o -\dfrac {0.0592V} {n} log \: Q[/tex]
Reaction
3A(s) + B+3(aq) → 3A+(aq) + B(s)
Half Reaction
3A(s)⇒3A⁺(aq)+3e⁻
B⁺³(aq)+3e⁻⇒B(s)
n = 3 (3 electron transfer)
Q = the reaction quotient :
[tex]\tt Q=\dfrac{[A^+]^3}{[B^{+3}]}=\dfrac{0.5^3}{1.5.10^{-3}}=83.3[/tex]
E cell :
[tex]\tt E_{cell}=2-\dfrac{0.0592}{3}log~83.3\\\\E_{cell}=1.962~V[/tex]
Which of these elements could gain one electron to form an ionic bond with potassium explain why
Answer:
ChlorineIt has 7 electrons in it last shell. it will gain one electron to complete its octet and become Cl-. The ionic bond of chlorine form with potassium is Kcl ( potassium chloride)
Phosphorus has 5 electrons in its last shell it need 3 more electron to stable .Sulphur has 6 electron. it needs 2 electrons Argon is already stable as it has 8 electrons in its last shell it will not gain or loose any electronsTo solve such this we must know the concept of ionic reaction. Cl is the element could gain one electron to form an ionic bond with potassium.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound.
Potassium will act as cation as K⁺, chlorine has 7 electrons in it last shell, it can gain one electron to complete its octet and become Cl⁻. The ionic compound of Cl with K is KCl.
Phosphorus has 5 electrons in its last shell it so, it needs 3 more electron to get stable .Sulphur has 6 electron, it needs 2 electrons to get stable. Argon is already stable as it has 8 electrons in its last shell so, it will not gain or loose any electrons.
Therefore, Cl is the element could gain one electron to form an ionic bond with potassium.
Learn more about the chemical reactions, here:
https://brainly.com/question/3461108
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Which statement is true about water's density and the survival of marine life? view attachment
How does the Periodic Table work and what is it? What are periods and groups?
Answer:
The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.
How would you compare young soil to soil that has been around a long time?
Answer:
young soil has less organic materiel that old
Explanation:
Need help fast please!
Find the mass of 4.56 mols of LaPO4
Answer:
Mass = 1080.26 g
Explanation:
Given data:
Number of moles of LaPO₄ = 4.56mol
Mass in gram = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of LaPO₄ = 236.9 g/mol
by putting values,
4.56 mol = mass/ 236.9 g/mol
Mass = 4.56 mol × 236.9 g/mol
Mass = 1080.26 g
As the amplitude decreases in a wave, the energy increases.
Lesson 4.07
Question 6 options:
True
False
Answer:
False
Explanation:
The relationship between energy and amplitude can be written as eαa^2
This means that the energy of a wave is directly proportional to the square of the amplitude.
22
Silicon(IV) oxide is a covalently bonded compound.
Which statements are correct?
1
2
Silicon atoms form four single bonds in silicon(IV) oxide.
Oxygen atoms form two double bonds in silicon(IV) oxide.
Silicon(IV) oxide has a high melting point.
Silicon(IV) oxide contains one silicon atom and four oxygen atoms.
3
4
с
D
2 and 3 only
3 and 4 only
B
1 and 3 only
1 and 2 only
А
А
Answer:
2 and 3 only
Explanation:
The formular for the compound; Silicon(IV)oxide is SO2
1. Silicon atoms form four single bonds in silicon(IV) oxide.
This statement is wrong because the silicon is doubly bonded to two oxygen atoms.
2. Oxygen atoms form two double bonds in silicon(IV) oxide.
This statement is correct.
3. Silicon(IV) oxide has a high melting point.
This statement is correct Due to it's macromolecular structure, it is able to form thousands of covalent bonds between it's sulphur and oxygen sub units.
4. Silicon(IV) oxide contains one silicon atom and four oxygen atoms.
This statement is wrong as silicon(iv) oxide contains only two oxygen atoms.
two examples for magnetic and nonmagnetic materials
Answer:
Magnetic: Iron and nickel
Nonmagnetic: Rubber, feathers and/or leather
Explanation:
Hope this helps!
1. Does elevation play a factor? If so, can the elevation be changed to protect the homes? 2. Could the residents build a structure that would prevent a tsunami from reaching the community? What would this structure look like? How would the residents build it? 3. What could limit the erosion of the beach?
Answer:
Yes.
Explanation:
Yes, elevation play a great role and has the ability to protect homes from natural disasters such as flood and tsunami etc. The residents build a hard structure of wall along the beach that would prevent a tsunami from reaching the community and also built homes at higher elevation. The residence built it with the help of government and this wall is also effective in reducing the erosion of the beach.
Answer:
1. Yes elevation does play a factor if the house was higher i feel like it wouldnt get as damaged
2. Yes they could build a high enough wall that it would take most of the impact away from the houses, you would build it with the thickest peice of wood that you could find and use long screws and cement the wood into the ground.
3. The wall will also help from erosion
Explanation: i got it right on my project.
6. A solution of CuSO4 is electrolyzed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode? ( F =96,500C,Charge of Cu in CuSO4 = +2)
The mass of Copper deposited at the cathode : 0.296 g
Further explanationGiven
time = t = 10 min=600 s
current = i = 1.5 A
F = 96500 C
charge Cu=+2
Required
The mass of Copper
Solution
Faraday's Law
[tex]\tt W=\dfrac{e.i.t}{96500}[/tex]
e = Ar/valence(valence Cu=2, Ar=63.5 g/mol)
Input the value :
[tex]\tt W=\dfrac{63.5/2\times 1.5\times 600}{96500}\\\\W=0.296~g[/tex]
Which of the following elements has the highest atomic radius, Sr or Cu
Answer:
Sr or Strontium
Explanation:
sr: strontium has atomic radius of 255pm
cu: copper has an atomic radius of 128pm
they teach you in chem how to do it based off the chart but I don't remember that method
what phase is skipped during sublimation
Answer:
Liquid
Explanation:
If a phase is skipped, the skipped phase will be liquid because it is the only phase between solid and gas.
Answer:
liquid
Explanation:
sublimation, is when a substance goes directly from a solid to gas. it doesn't pass through the liquid state.
1. Mixing is a physical change.
True or false
Answer:
false it is a chemical change
Which of the following best explains why the atomic mass on the Periodic Table is a decimal.
When would evaporation be a good method for separating the parts of a mixture?
A.When the densities of the compound are different
B. When some of the components are magnetic
C. When some of the components are very small
D.When the boiling points of the components are different
Answer:
D.When the boiling points of the components are different
Explanation:
I believe the formal name for this procedure is actually distillation.
if you have 30% of 100 milliliters of an aqueous solution of ethanol, what volumes of ethanol and water are in the solution?
Volumes of ethanol and water are in the solution : 30 mL and 70 ml
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
Percent Volume (% v/v) : volume (ml) of solute/100 ml of solution ⇒ ratio of volume of the solute to total volume of the solution
[tex]\tt \%solute=\dfrac{solute~volume}{solution~volume}\times 100\%[/tex].
30% ethanol ⇒30% etanol, 70% water
In 100 mL solution :
[tex]\tt Ethanol=30\%\times 100~mL=30~mL\\\\Water=70\%\times 100~mL=70~ml[/tex]
Fission U235 can produce what?
A Krypton
B Strontium
C Barium
D Xeonon
E All of the above
Answer:
A. krypton
Explanation:
give me brainly
Which of the following statements best explains why some of the offspring
have white flowers?
Answer: C.
Explanation: These offspring inherited a DNA sequence coding for white flowers from each parent plant.
:)
0.500 L of a gas is collected at 2911 MM and 0°C. What will the volume be at STP?
Answer:
V₂ = 1.92 L
Explanation:
Given data:
Initial volume = 0.500 L
Initial pressure =2911 mmHg (2911/760 = 3.83 atm)
Initial temperature = 0 °C (0 +273 = 273 K)
Final temperature = 273 K
Final volume = ?
Final pressure = 1 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
by putting values,
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 3.83 atm × 0.500 L × 273 K / 273 K × 1 atm
V₂ = 522.795 atm .L. K / 273 K.atm
V₂ = 1.92 L
C2H6O2 is infinitely miscible(soluble) in water. Ethylene glycol is a nonelectrolyte that is used as antifreeze. What is the lowest possible melting point for engine coolant that is 30% ethylene glycol? The Kf for H20 is 1.86 C/m.
Answer:
The lowest possible melting point for engine coolant is -12.8°C
Explanation:
This is about colligative property about freezing point depression.
We think the data 30% as a %m/m. It means that 30 g of ethylene glycol are contained in 100 g of solution. Therefore, we have 70 g of solvent.
Formula for freezing point depression is:
ΔT = Kf . m . i
Where ΔT = Freezing T° of pure solvent - Freezing T° of solution.
Freezing T° of solvent = 0° (We talk about water)
Let's determine m (molality, moles of solute in 1kg of solvent)
70 g = 0.070 kg
30 g . 1 mol / 62.07 g = 0.483 moles
0.483 mol / 0.070 kg = 6.90 m
We replace data in formula:
0° - Freezing T° of solution = 1.86 °C/m . 6.90m . 1
As ethylene glycol is a nonelectrolyte, i = 1
Freezing T° of solution = - 12.8°C
pls help me with science
