Answer:
the number of electrons in a particular shell is given by the formula 2n^2 . However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell.
A student made a sketch of a potential energy diagram to represent an endothermic reaction.
Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent. (10 points)
Answer:
Incorrect
Explanation:
X is the reactants
Y is the products
In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).
Enthalpy change (∆H) = products (Y) - Reactants (X)
For an endothermic reaction, the ∆H value should be positive.
Enthalpy change
The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.
It represents an exothermic reaction rather than endothermic.
Therefore, the student is incorrect.
How many particles are in 13.5 grams of Beryllium ?
There would be 9.03 x [tex]10^{23}[/tex] particles in 13.5 grams of Beryllium.
Recall that 1 mole of a substance contains 6.02 x 10^23 atoms.
Number of moles in 13.5 grams of Beryllium = mass/molar mass
= 13.5/9
= 1.5 moles
Thus, total number of atoms in 1.5 moles Beryllium:
= 1.5 x 6.02 x 10^23
= 9.03 x [tex]10^{23}[/tex]
More on the number of particles in a substance can be found here: https://brainly.com/question/1445383
A 217.6 sample of gas is collected at 9.011 atm and 127.8°C. What volume does the gas have at 44.9 atm and 11.9 °C?M
Answer:
The correct answer is = 31.04
Explanation:
The relation between volume, temperature and pressure of a fix amount of a gas can be expressed by the combined gas law:
PV/T = k
It can be written as well as
P1V1/T1 = P2V2/T2
Given:
V1 = 217.6
P1 = 9.011 atm
T1 = 127.8°C = 400.95 K
P2 = 44.9
T2 = 11.9 °C = 285.05
Solution:
Putting value in the formula
V2 = P1V1T2/P2T1
= (217.6*285.05*9.011)/44.9*400.95
V2 = 31.04
How does the process of cell division replace damaged cells
Cells split into two new cells with the identical genetic make up
Chloroplasts use carbon dioxide and water to create glucose
Metatron Gia uses oxygen to break down glucose and convert it to ATP
Waste passes through the cell membrane and leaves the cell
Answer:
A
Explanation:
The cells split up into two to repair the damaged cell
Explain what will happen to the crystal when cations are pushed they face each other and the movement is simulating an applied force
Answer:
When an ionic crystal breaks, it tends to do so along smooth planes because ... ions are forced near each other and the repulsive force causes the crystal to shatter. ... Cations move to one electrode, while anions move to the other, ... Diagram of ions in an ionic solution when an electrical current is applied.
Explanation:
Hope this helped
The diagram below represents a beaker of water being heated by a flame. The arrows represent heat
transfer occurring in the beaker.
Which process is represented by the arrows in the diagram?
O condensation
O conduction
O convection
O radiation
Answer:
condensation
Explanation:
when heated beaker sed condensation
What are the coefficients for the following equation when it is balanced?
CaF2 (aq)
KOH(aq) →
Ca(OH)2 (s)
KF (aq)
what would the answer be? if you could help that would be a big help ^^
Answer:
well a 1000
Explanation:
18- The number of orbitals in each sublevel are:
A:-s:2, p:3, d:10, and f:14
B:-s:2, p:6, d:10, and f:14
C:-s:1, p:3, d:5, and f:7
D:-s:1, p:2, d:3, and f: 4
s2,p6,d10,f14
S contains 2 orbitals
P contains 6 orbitals
D contains 10 orbitals
F contains 14 orbitals
Help please and thank you
Answer:
5. The coefficients are: 2, 7, 2, 4
6. The coefficients are: 1, 4, 1, 2
Explanation:
5. Balancing the equation.
__NO₂ + __H₂ —> __NH₃ + __H₂O
The above equation can be balance as illustrated below:
NO₂ + H₂ —> NH₃ + H₂O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before NO₂ and 4 before H₂O as shown below:
2NO₂ + H₂ —> NH₃ + 4H₂O
There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by writing 2 before NH₃ as shown below:
2NO₂ + H₂ —> 2NH₃ + 4H₂O
There are 2 atoms of H on the left side and a total of 14 atoms on the right side. It can be balance by writing 7 before H₂ as shown below:
2NO₂ + 7H₂ —> 2NH₃ + 4H₂O
Now the equation is balanced. Thus, the coefficients are: 2, 7, 2, 4
6. Balancing the equation:
__SiO₂ + __HF —> __SiF₄ + __H₂O
The above equation can be balance as illustrated below:
SiO₂ + HF —> SiF₄ + H₂O
There are 4 atoms of F on the right side and 1 atom on the left side. It can be balance by writing 4 before HF as shown below:
SiO₂ + 4HF —> SiF₄ + H₂O
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 2 before H₂O as shown below:
SiO₂ + 4HF —> SiF₄ + 2H₂O
Now the equation is balanced. Thus, the coefficients are: 1, 4, 1, 2
What is the predicted change in the boiling point of water when 2.10 g of
barium chloride (BaCl2) is dissolved in 5.50 kg of water?
The addition of any non-volatile solutes will elevate the boiling point of the solution. The change in boiling point of water by the addition of 2.10 of barium chloride is 0.0028 ° C. Hence, option A is correct.
What is boiling point?Boiling point of a substance is the temperature at which it changes from liquid to vapour where the two states are in equilibrium. Boiling point of a substance depends on the bond type, molecular mass and purity of it.
The change or elevation of boiling point of a solution can be determined from its molality m and elevation constant Kb and the Van't Hoff factor i as follows:
ΔT = i Kb m.
Molality of the solution is the no.of moles divided by the mass of solvent in kilogram. Given the mass of barium chloride is 2.10 g and its molar mass is 208.23 g . The no.of moles of solute is 2.10/208.23 g = 0.0100.
Molality of the solution can be calculated as follows:
Molality m = 0.0100 / 5.50 Kg
= 0.0018 mol/kg.
Now, the ΔT s calculated from these values. Provided Kb of water is 0.51 ° C /mol and i = 3.
ΔT = 0.0018 mol/kg × 0.51 × 3
= 0.0028 ° C.
Therefore, water will boil at 100.0028 ° C. Hence, option A is correct.
To find more about boiling point, refer the link below:
https://brainly.com/question/28203474
#SPJ1
What is the mass of 0.125 moles of tin sulfate (SnSO4)?
Answer:
26.85 grams
Explanation:
The formula for mole calculations is number of moles = given mass/gram-formula mass.
The number of moles is given to us, which is 0.125.
The gram formula mass of SnSO4 is about 214.77.
Plug in the values we have into the equation. It should look like this:
0.125 = x / 214.77
Solve for x by multiplying 214.77 and 0.125. The answer should be about 26.85 grams.
Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid.
Which conclusion best fits her observations?
Answer:
However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample
pls mark me the brainliest
What is the frequency of an electromagnetic wave that has a wavelength of
8.5 x 102 m in a vacuum? (The speed of light in a vacuum is 3.00 x 108 m/s.)
A. 1.2 x 10-3 Hz
B. 2.8 x 10-6 Hz
C. 3.5 105 Hz
D. 2.6 x 1011 Hz
➡ ANSWER
☑ C. 3.5 105 Hz
Explain how you determine the molar mass of Al2(SO4)3
Molar Mass of Al = 27
Molar Mass of S = 32
Molar Mass of O = 16
Putting the molar mass value in Al2 (SO4) 3
27 x 2 + 3 ( 32 + 16 x 4)
54 + 3 ( 32+ 64)
54 + 3 x 96
54 + 288
342
Oxidation and reduction reactions (redox) involve the loss and gain of electrons. Half-reactions are a way for us to keep track of how many electrons are gained or lost by a particular species during a chemical reaction. These half reactions can be useful in understanding how batteries work, and how other reactions that occur in your body and in nature work as well. Questions 1. In the model, are electrons lost or gained during oxidation
Answer:
Electrons are lost during oxidation (LEO)
(6) I need help very fast plsss
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What is the maximum number of electrons that can occupy a box in an orbital filling diagram at any
energy level?
2
6
8
14
Answer:
2
Explanation:
I need help with number 19 A through D
If you increase the amount of Reactant A, the reaction rate will also increase.
What is this statement an example of?
A. A theory
B. An observation
C. A hypothesis
D. A scientific question
Which of the following can cause a population to decrease in size?
A Lack of rain
B. More births than deaths C. Plentiful food supplies
D. Organisms moving into an area, but not out.
Answer:
D
Explanation:
because when some organisms will move from one place to another the number of population will decrease
PLS HELP Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. YOU WILL GET POINTS IF U DO THIS PLSSSSSS
Answer:
because you are cxloser
Explanation:
Please help please help
Answer:
sry I don't know much about chemistry
Magnesium lon has less electrons than its atom
True
False
A bird has flown 300 metres for 6 hours. What is the bird's speed? Formula for speed = d/t * 2 points
40 m/hr
50 m/s
50 m/h
50 m/min
Answer:
C
Explanation:
d=300
t=6hr
speed=?
speed=300/6
speed=50m/hr the important thing in this question is to get the right units
Substances with a high polarity have a(low/high) surface tension ?
Answer:
I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.
What is a reaction rate
Answer:
Explanation:
A reaction rate is the measure of the change in concentration of the disappearance of reactants or the change in concentration of the appearance of products per unit time
What would happen to the entropy in the reaction 203(9) ► 302(9)?
A. It is impossible to tell.
B. It stays the same.
C. It decreases.
D. It increases.
bez number of particles in reaction increases so randomness or entropy increase.
as entropy is the degree of randomness of particles in a system
Select the atoms that are likely to gain electrons to form anions:
A. Cesium (Cs)
B. Chlorine (CI)
c. Nitrogen (N)
D. Sulfur (S)
hurryyy asap make u the brainlyeist
Answer:
c
Explanation:
Can you give me a paragraph about the digestive system?
Answer:
The digestive system is very important to animal health. Without the digestive system earth might still be lifeless other than bacteria and what not. The digestive system is a system to keep us full and energized. It allows us to chew and swallow our food and let it break down in our belly acid. Then it departs our body through the large, small intestines to then be flushed out to sea.
~ LadyBrain
Explanation:
an organ that is part of the
digestive system his digestive system is extremely simple