Answer:
E = 0.14 ×10⁻¹⁷ J
Explanation:
Given data:
Wavelength of light = 142 nm (142 ×10⁻⁹ m)
Energy of light = ?
Solution:
Formula:
E = hc/λ
h = plancks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 142 ×10⁻⁹ m
E = 19.89×10⁻²⁶ J.m/ 142 ×10⁻⁹ m
E = 0.14 ×10⁻¹⁷ J
Why is The Law of Conservation of Matter a law and not a theory? will brainlist
Balance the following:
C₂ + B → B₂C₂
Ag₄ + SO₂ → AgO + S₂
Answer:
The balanced reactions are:
C₂ + 2B → B₂C₂
Ag₄ + 2SO₂ → 4AgO + S₂
Explanation:
The Law of Conservation of Matter postulates that "the mass is not created or destroyed, only transformed." This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends. In other words, then the mass before the chemical reaction is equal to the mass after the reaction.
In other words, the law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts .
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
You have:
C₂ + B → B₂C₂
Left side: 2 C and 1 B.
Right side: 2 C and 2 B.
Carbon C is balanced since you have the same amount of the element on each side of the reaction, but boron B is not balanced. So, balancing the reaction:
C₂ + 2B → B₂C₂
Left side: 2 C and 2 B.
Right side: 2 C and 2 B.
Now you have the same amount of each element on each side of the reaction, so the reaction is balanced.
Now you have:
Ag₄ + SO₂ → AgO + S₂
Left side: 4 Ag, 1 S and 2 O.
Right side: 1 Ag, 2 S and 1 O.
Balancing the Ag:
Ag₄ + SO₂ → 4AgO + S₂
Left side: 4 Ag, 1 S and 2 O.
Right side: 4 Ag, 2 S and 4 O.
Balancing the O:
Ag₄ + 2SO₂ → 4AgO + S₂
Left side: 4 Ag, 2 S and 4 O.
Right side: 4 Ag, 2 S and 4 O.
You have the same amount of each element on each side of the reaction, so the reaction is balanced.
Based on the molar mass of LiCl (42.39 g/mol) and on the count of the ions inside the unit cell, what is the mass (in grams) of LiCl is in a unit cell.
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of the value of the count of the ions inside the unit cell. To determine the mass (in grams) of LiCl in a unit cell, the formula below can be used
count of ions inside the unit cell = mass of LiCl ÷ molar mass of LiCl
Hence,
Mass of LiCl = count of ions inside the unit cell × molar mass of LiCl
Count of ions (Li⁺ and Cl⁻ ions specifically) inside the unit cell should have been provided in the question
Molar mass of LiCl was given to be 42.39 g/mol
The mass of the LiCl unit cell has been 2.82 [tex]\rm \bold{\times\;e^-^2^2}[/tex] grams.
The given structure has been the unit cell of the LiCl having 4 atoms of Li and 4 atoms of Cl.
The number of Li and Cl in a molecule of LiCl has been 1, and 1 respectively.
The presence of 4 atoms of Li and Cl indicates that there has been the presence of 4 molecules of LiCl.
The molar mass ofLiCl = 42.39 g/mol.
The number of molecules present in a mole of the sample has been equivalent to the Avagadro number.
6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 1 mole LiCl.
6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 42.39 grams LiCl.
The mass of 4 molecules of LiCl has been:
4 molecules = [tex]\rm \dfrac{42.39}{6.023\;\times\;1^2^3}\;\times\;4[/tex]
4 molecules = 2.82 [tex]\rm \times\;10^-^2^2[/tex] grams
2.82 [tex]\rm \times\;10^-^2^2[/tex] grams = 2.82 [tex]\rm \bold{\times\;e^-^2^2}[/tex] grams.
The mass of the LiCl unit cell has been 2.82 [tex]\rm \bold{\times\;e^-^2^2}[/tex] grams.
For more information about the mass of a unit cell, refer to the link:
https://brainly.com/question/14020091
HELP HELP HELP! NOW ANSWER THE IMGAGE'S 50POINTS!
[tex]\rule{100}{3}[/tex]
Multicellular Plants and animals have organs with specific function.
Which structures do eukaryotic cells have for performing functions?
Ans:-
Organelles
[tex]\rule{100}{3}[/tex]
Which process takes place with in mitochondria?
Ans:-
Cellular Respiration
Answer:
The ribosomes on the rough endoplasmic reticulum (ER) use the RNA to create different types of proteins needed by the body. These proteins are then modified, packaged, and transported by the endomembrane system, which includes organelles such as the Golgi apparatus and lysosomes
This diagram is of an amniote egg.
What is the correct label for A in this diagram?
embryo
zygote
amnion
placenta
Answer:
amnion
Explanation:
Answer: amnion
Explanation:
Formation of a new substance is a sign of a
change.
A)
Physical
B)
Chemical
Kinetic
D)
Electrical
NEED HELP ASAP!!!!!!
What would be the three amino acids that correspond to the mRNA sequence: GGACACCCG
Question 1 options:
arg, ser, pro
glu, pro, his
gly, his, pro *********
pro, his, pro
Which of the following elements has the smallest ionic radius?
Distance with respect to time
Answer: okay
Explanation:
Answer:
sure
Explanation:
what is the cause of desertification
A. Farming
B. Creating reservoirs
C. Overgrazing
D. Driving motor vehicles
Answer:
C overgrazing is the answer
Answer:
yeah he got it right
Explanation:
it's C
Ask BRIA
Water vapor
Liquid water
Which of the following labels should be added to all of the black arrows in the above
illustration?
O temperature increases
O temperature decreases
heat removed
O heat added
Answer:
o temperature increases
CO2 + H2O → C6H12O2 + O2
In a chemical equation, such as the one for photosynthesis above, which is thec
correct order of terms from left to right?
Products, Yield, Reactants
There is no correct order, any order is acceptable.
O Yield, Reactants, Products
Answer:
B
Explanation:
Answer:
bExplanation:
What happens to the temperature of a substance during a change of state?
Answer:
The smallest scale division is a tenth of a centimeter or 1 mm
Explanation:
Will a paper airplane with longer wings fly farther than shorter wings? IV DV Hypothesis
Answer: yes
Explanation:
longer wing
Why might one type of cell have more mitochondria than another type of cell?
Answer:
Some cells have more mitochondria than others. Your fat cells have many mitochondria because they store a lot of energy. Muscle cells have many mitochondria, which allows them to respond quickly to the need for doing work.
a sample of gas has a pressure of 742 torr. What is the pressure in atmospheres?
Answer:742 torr= approximately 0.976 atm
Explanation:
Since we know that one atm= 760 torr, we can compute the following calculation:
(742 torr/1)*(1atm/760torr)=0.976316 atm
Remember sig figs (3) to round it to 0.976 atm
[tex]\frac{742 torr}{1}[/tex]*[tex]\frac{1 atm}{760 torr}[/tex]=0.976316=0.976 atm
(torr cancels out and we're left with atm)
Hope this helps :)
Mercury completes one orbit around the Sun in 68 days.
a. True
b. False
Answer:
true :PP
Explanation:
What is the final volume, in milliliters, when 5.80 mL of 25.0 %(m/v) NaOH solution is diluted to give a 3.50 %(m/v) NaOH solution.
Answer:
41.43 mL
Explanation:
First we calculate the mass of NaOH in the original solution:
25.0 % m/v means that in 100 mL of solution, there are 25 grams of NaOH.This means that in 5.80 mL, we would have (5.80 * 25/100) 1.45 grams of NaOH.Then we calculate the volume of the diluted solution, using the grams of NaOH (that remain the same throughout the dilution process):
1.45 g NaOH * [tex]\frac{100 mL}{3.50gNaOH}[/tex] = 41.43 mLA sample of nitrous Oxide has a volume of 1 £.20 at 1500 mm HG and -10°C. Calculators pressure when it’s value is compressed 250 L and its temperature increase to 34°c
Answer:
nitric acid will be if you get you will pixel purpose
Hypothetical element X has 3 stable isotopes. The relative peak intensities are 79.52 for 180.0 u, 100.0 for 184.0 u, and 82.98 for 186.0 u. What is the average atomic mass for X
Answer:
The relative atomic mass of X is 183.4
Explanation:
The relative atomic mass of an element is the weighted average of the masses of the isotopes using the carbon-12 atom has a mass of exactly 12 units as as a standard.
The relative sizes of the peaks gives a direct measure of the relative abundances of the isotopes. The tallest peak is often given an arbitrary height of 100 and is known as the base peak.
To calculate the relative atomic mass of the element X which has 3 stable isotopes with the relative peak intensities as given below:
79.52 for 180.0 u, 100.0 for 184.0 u, and 82.98 for 186.0 u, the sum of the products of the relative peak intensity of each isotope and their isotopic mass is divided by the sum of the peak intensities.
Relative atomic mass of X = (79.52 × 180) + (100 × 184.0) + (82.98 × 186)/(79.52 + 100 + 82.98)
Relative atomic mass of X = (14313.6 + 18400 + 15434.28)/(262.5)
Relative atomic mass of X = 48147.88/262.5 = 183.4
Therefore, the relative atomic mass of X is 183.4
The average atomic mass of element X has been 183.42 amu.
The average atomic mass of the element has been given with the abundance and the atomic mass of the isotopes present.
The average atomic mass (amu) has been given as:
[tex]amu=\dfrac{(am\;\times\; \rm \% abundance)_1\;+\;(\textit am\;\times\;\% abundance)_2\;+\;(\textit am\;\times\;\% abundance)_3}{\sum abundance}[/tex]
Where, atomic mass and abundance of isotope 1, has been [tex](am\;\times\; \rm \% abundance)_1=(79.52\;\times\;180)\;\rm u[/tex]
The atomic mass and abundance of isotope 2, has been [tex](am\;\times\; \rm \% abundance)_2=(100\;\times\;184)\;\rm u[/tex]
The atomic mass and abundance of isotope 3, has been
[tex](am\;\times\; \rm \% abundance)_3=(82.98\;\times\;186)\;\rm u[/tex]
The sum of abundance, has been, [tex]\sum abundance=79.52\;+\;100\;+\;82.98[/tex]
Substituting the values for calculating amu:
[tex]\\amu=\dfrac{(79.52\;\times\;180)\;+\;(100\;\times\;184)\;+\;(82.98\;\times\;186)\;amu}{79.52\;+\;100\;+\;82.98} \\amu=\dfrac{14,313.6\;+\;18,400\;+\;15,434.28}{262.5} \\amu=183.42[/tex]
The average atomic mass of element X has been 183.42 amu.
For more information about atomic mass, refer to the link:
https://brainly.com/question/3187640
Explain your observations. What did you observe as time passed in each can of liquid? Did you see a significant change in temperature? Why or why not? Submit your data chart here.
Answer:
Hey there.. the question is not proper. Please give the whole question
The very top layer of Earth is the crust, which is relatively quite thin when compared to the other layers of Earth. Which of these best describes the composition of Earths crust?
Group of answer choices
Rocky
Gaseous
Liquid
Metallic
PLEASEEEE HELP MEEEEEEEEEEEEEEEEEEE
Answer:
D
Explanation:
Answer:
Girl it's "D"
Explanation:
Identify the state(s) of matter that each property describes.
takes the shape of its container:
gas
liquid
solid
fills all available space:
gas
liquid
solid
maintains its shape:
gas
liquid
solid
can be poured:
gas
liquid
solid
is compressible:
gas
liquid
solid
has a fixed volume:
gas
liquid
solid
Answer:
See below!
Explanation:
Gases and liquids take the shape of the container.
A gas fills all available space.
A solid maintains its shape.
A liquid can be poured.
A gas is compressible.
A liquid and solid have fixed volumes.
Identification of the state(s) of matter that each property describes.
The Gas and liquid takes the shape of the container.A gas fills all available space.A solid maintains its shape.A liquid can be poured.A gas is compressible.A liquid and solid have fixed volumes.Difference between properties of solid, liquid and gas?Solids liquids Gases
Rigidity Highly rigid Less rigid Not rigid
Shape Difinite Acquires shape Acquires shape
of the container. of the container.
Volume Difinite Difinite Indifinite
Compressibility Not Slightly Highly
compressible compressible compressible
Fluidity Can not flow Can flow Can flow
learn about state of matter,
https://brainly.com/question/9402776
#SPJ2
Help plz:))) I’ll mark u brainliest ASAP 10 points
Which family of elements always forms ions with a charge of -1 in compounds ?
Answer:
halogens
Explanation:
Answer:
halogens
Explanation:
PLEASE MARK ME AS BRAINLIEST
g is the maximum number of grams of ammonia, NH , which can be obtained from the reaction of 10.0 g of H and 80.0 g of N
Answer:
56.67 g of NH₃.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
N₂ + 3H₂ —> 2NH₃
Next, we shall determine the masses of N₂ and H₂ that reacted and the mass of NH₃ produced from the balanced equation. This is illustrated below:
Molar mass of N₂ = 14 × 2 = 28 g/mol
Mass of N₂ from the balanced equation = 1 × 28 = 28 g
Molar mass of H₂ = 1 × 2 = 2 g/mol
Mass of H₂ from the balanced equation = 3 × 2 = 6 g
Molar mass of NH₃ = 14 + (3×1) = 14 + 3 = 17 g/mol
Mass of NH₃ from the balanced equation = 2 × 17 = 34 g
SUMMARY:
From the balanced equation above,
28 g of N₂ reacted with 6 g of H₂ to produce 34 g of NH₃
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
28 g of N₂ reacted with 6 g of H₂.
Therefore, 80 g of N₂ will react with = (80 × 6)/28 = 17.14 g of H₂.
We can see from the calculation made above that a higher mass (i.e 17.14 g) of H₂ than what was given (i.e 10 g) is required to react completely with 80 g of N₂. Thus, H₂ is the limiting reactant and N₂ is the excess reactant.
Finally, we shall determine the maximum mass of ammonia (NH₃) produced from the reaction.
To obtain the maximum mass of NH₃, the limiting reactant will be used because all of it is consumed in the reaction.
The limiting reactant is H₂ and the maximum mass of NH₃ can be obtained as follow:
From the balanced equation above,
6 g of H₂ reacted to produce 34 g of NH₃.
Therefore, 10 g of H₂ will react to produce = (10 × 34)/6 = 56.67 g of NH₃.
Therefore, 56.67 g of NH₃ is produced from the reaction.
Anybody know how I can get the answers from a Y o u t u b e video that’s an hour and 54 mins long without actually watching it?
it is a property of a substance that is independent of amount and used to identify substance?
Answer:
Some properties, such as solubility, melting point, boiling point, and density are independent of the amount of substance being examined. These properties are known as intensive properties and are used to identify a substance. The density of a substance is defined as the mass per unit volume.
Explanation:
Consider a cup of hot tea, a cup of juice at room temperature, and a cup of ice water. Which beverage has the highest average kinetic energy?
Question 2 options:
A)
All liquids have the same average kinetic energy.
B)
A cup of hot tea
C)
A cup of ice water
D)
A cup of juice at room temperature
Answer:
I’m guessing a Or c
Explanation:
Answer:
B)
A cup of hot tea
Explanation:
Because temperature of hot tea is higher than others
And kinetic energy is directly proportional to temperature.
describe what happens in each stage of mitosis
Answer:
Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. ... These phases occur in strict sequential order, and cytokinesis - the process of dividing the cell contents to make two new cells - starts in anaphase or telophase. Stages of mitosis: prophase, metaphase, anaphase, telophase.
Explanation:
Can someone please help me I've searched all over and can't find these answers Ive uploaded 3 images too make it easier on you I too a photo of part E to help with part F please help all I need is answers too part D and F I will give brainiest
Answer:
Hey.
Explanation:
I will paste my explanation in the comments because apparently my answer has inappropriate words
