Answer:
it's b
Explanation:
The emission spectrum which is a line spectrum of iodine consists of 6 blue lines as it absorbs yellow light.
What is emission spectrum?Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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12. If the particles of a liquid are always moving, why don't they all come apart from each other and become a gas?
Answer:
even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.
Explanation:
"but some do when they evaporate"
In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.
Particles in liquids:In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases. Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.
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Drag each phrase to indicate which flood mitigation technique it describes.(2 points)
floodplain management stormwater management elevated structures
reduces water runoff into streets, lawns, and other sitesprotects buildings in low-lying areas prone to floodsraises structures above flood levelenhanced by the addition of urban green spacesused mainly on the coast
Highlight
The phrase to indicate the flood mitigation technique it describes are:
Floodplain management – protects buildings in low-lying areas
stormwater management – reduces water runoff into streets, lawns, and other sites, and enhanced by the addition of urban green spaces.
Elevated structures-used mainly on the coast, raises structures above flood level.
What is flood mitigation?Flood mitigation is the control and management of movement of the blood water.
It includes flood gates and flood walls which manage the water of flood and prevent it from destroying building and homes.
There are different types of flood mitigation techniques for different areas.
Thus, Floodplain management – protects buildings in low-lying areas
stormwater management – reduces water runoff into streets, lawns, and other sites, and enhanced by the addition of urban green spaces.
Elevated structures-used mainly on the coast, raises structures above flood level.
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Flood mitigation manages and controls the flood water by removing inhabitants from the area. Floodplain management protects buildings.
What is flood mitigation?A flood mitigation is the control and management of the flood water by floodgates and floodwalls to prevent and protect the buildings and people.
The floodplain management of the mitigation technique involves the protection of low-lying buildings, stormwater management controls the flow of the floodwater flow in the streets and elevated structures are used in coastal regions to raise the level of the floodwater.
Therefore, different flood mitigation techniques are used to control and manage flood water.
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Which machine is the least simple? a bike a screw an inclined plane a lever
Answer: A bike
A bike is composed of various simple machines. It has a wheel and axle as one component, and it also has screws to hold the various parts together, along with levers and pulleys that are connected to the pedals. So all of these simple machine concepts work together to help transport the rider from point A to point B.
The other answer choices of screw, inclined plane, and lever, are fairly simple machines that don't have many things going on at once compared to a bike.
The least simple machine is "A Bike"
Hope this helps!
Which of these changes is a chemical change?
A. A block of ice forms liquid water when salt is sprinkled on it.
B. A block of ice is crushed into small pieces.
C. A block of ice melts when heated.
D. A block of ice fizzes and forms a gas when sodium is sprinkled on
it.
please help :)
Do S and Na have the same number of
electron shelis?
Answer:
Yes
Explanation:
Sulfur and Sodium will have the same number of electron shells.
Electronic configuration of
k l m
Na = 2 8 1
S = 2 8 6
We see that the have the same energy level.
Also, they belong to the same period on the periodic table. Elements in the same period will have equal number of shell.
Magnesium (24.30 g) reacts with hydrogen chloride (X g) to produce hydrogen gas (2.04 g) and magnesium chloride (96.90 g). How much hydrogen chloride was used in the reaction?
Answer:
[tex]74.64\ \text{g}[/tex]
Explanation:
Reactants
Magnesium = 24.3 g
Hydrogen chloride= x g
Products
Hydrogen gas = 2.04 g
Magnesium chloride = 96.9 g
As the mass of the reactions is conserved we have
Mass of reactants = Mass of products
[tex]24.3+x=2.04+96.9\\\Rightarrow x=2.04+96.9-24.3\\\Rightarrow x=74.64\ \text{g}[/tex]
Mass of hydrogen chloride is [tex]74.64\ \text{g}[/tex].
Populations in the deep-sea vent ecosystem can get energy storage molecules without sunlight. Do you agree or disagree with this claim? Explain your answer.
Answer:
Agree
Explanation:
The deep-sea vent ecosystem gets energy storage molecules without sunlight. Life in the vent ecosystem relies on alternate energy through the use of hydrogen sulfide present in the water emanating from the vent.
The producers that form the basis of the food chain are bacteria that use the hydrogen sulfide to create energy-rich molecule in a process known as chemosynthesis.
The equation of the chemosynthesis is as below:
[tex]CO_2 + 4H_2S + O_2 --> CH_20 + 4S + 3H_2O[/tex]
The specific heat of a substance which absorbs 7.5 x 10^3 J of
heat when a sample with a mass of 1.0 x 10^5g of the
substance increases in temperature from 10°C to 90° C will
be:
Answer:
9.4 x 10^-4 J/g°C
Which statement best describes the process of the formation of the solar system?
Formation. Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material
Is meat a mixture or substance?
Answer:
This type of meat is substance. If you were talking about meters then it would be a system of measurement.
Answer:
Mixture
Explanation:
Meat is composed of approximately 72–75 % water, 21 % nitrogenous compounds (19 % proteins and 1.5 % nonprotein nitrogen compounds which include nucleotides, peptides, creatine, and creatinine), 2.5–5 % lipids, 1 % non-nitrogenous compounds (vitamins) and carbohydrates (a very small amount of glycogen).
Maggie has 4 binders with 30 stamps in each binder. She has 3 binders with 36 baseball cards in each binder. If she gives away 45 stamps to a friend, how many stamps and cards does she have left? Maggie has stamps and cards left.
Answer:
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183
Explanation:
If Maggie gives 45 stamps to a friend, you must calculate the number of stamps and cards she has left.
You know Maggie has 4 folders with 30 stamps in each folder. So the number of stamps she owns is calculated as:
4 folders*30 stamps in each folder= 120 stamps
If Maggie gives 45 stamps to a friend, then the number of stamps she has left will be calculated as the difference (the subtraction) between the stamps she owned and the ones she gives away:
120 stamps - 45 stamps= 75 stamps
On the other hand, she has 3 binders with 36 baseball cards in each binder. So the number of cards she owns is calculated as:
3 binders * 36 baseball cards in each binders= 108 baseball cards
The number of stamps and cards you have left is calculated as:
75 stamps + 108 baseball cards= 183
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183
Astatine-210 has a half-life of 8.08 days. What fraction of a sample of astatine-210 is left unchanged after 16.16 days?
Answer:
0
Explanation:
Given parameters:
Half-life = 8.08days
Unknown:
What fraction is left unchanged after 16.16days = ?
Solution:
The half - life of a substance is the time taken for the half of a radioactive material to decay to half.
Day 0 Day 8.08 Day 16.16
100% 50% 0% Parent
0% 50% 100% Daughter
After 16.16 days, non of the original sample will remain unchanged.
Aly's science class was looking at bacteria through a microscope. Aly's teacher said some bacteria can be as small as 0.00365 cm long. What is the length of the bacteria written in scientific notation?
Answer:
[tex]0.00365\ cm=3.65\times 10^{-3}\ cm[/tex]
Explanation:
Aly's teacher said some bacteria can be as small as 0.00365 cm long.
In this problem, we need to write the length of the bacteria written in scientific notation. Any number can be written in the form of scientific notation as follows :
[tex]N=a\times 10^b[/tex]
a is a real no and b is an integer
In the given number, there are two zeroes before 3. We need to shift the decimal after 3. It can be done as follows :
[tex]0.00365\ cm=3.65\times 10^{-3}\ cm[/tex]
Hence, this is the required solution.
What mass of water must be used to dissolve 0.500 kg C2H5OH to prepare a 3.00 m solution?
Answer:
500g Ika= 10.85 mol 500g (46.0699) - 10.35 mol - 3.00m - 13.62 kq 5.
Explanation:
Does this help?
A 3.00 M solution of [tex]C_2H_5OH[/tex] would be prepared by dissolving 0.500 kg of [tex]C_2H_5OH[/tex] in 3.62 kg of water.
Stoichiometric calculation0.500 kg [tex]C_2H_5OH[/tex] is equivalent to (mole = mass/molar mass):
500g/46.07 = 10.85 moles of [tex]C_2H_5OH[/tex]
3.00 M solution of [tex]C_2H_5OH[/tex] can be prepared by dissolving 10.85 moles in (molarity = moles/volume):
10.85/3 = 3.62 Liters of water
3.62 liters of water weighs (density = mass/volume);
1 x 3.62 = 3.62 kg
Thus, 3.62 kg of water will be required to prepare the solution.
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A baseball is thrown a distance of 20 meters. What is its speed if it takes 1 second to cover the distance?
The particles in liquids and gases show random motion. What does that mean and why does it occur??
Answer:
Liquids and gases show random movements because of potential and kinetic energy.
It happens when heat is applied to the particles and they gain more potential and kinetic energy and move around faster. With gases, they have the most energy.
If anything doesnt make sense, make sure to message me
Answer:
The particles show random motion because liquid and gas particles do not have a rigid structure, unlike solid particles. They are free to go anywhere.
Explanation:
ClO3− Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all nonhydrogen atoms, or use square brackets to denote the overall charge. View Available Hint(s)
Answer:
See explanation
Explanation:
The overall charge on ClO3− is shown on the image attached to this answer. If we calculate the formal charges on each atom in the structure, we will notice that one oxygen atom has a formal charge of -1 while all other atoms have a formal charge of zero.
This gives the compound an overall charge of -1 as shown in the image attached to this answer. This is the correct Lewis structure for the compound ClO3− .
The molecule has a formal charge of -1 on all oxygen atoms, and +2 on the Cl atom.
When all the electrons of an atom are shared equally, the charge attained by the atom is known as a formal charge.
The formal charge can be calculated as:
Formal charge = valence electron - non-bonding electron - [tex]\rm \dfrac{bonding\;electron}{2}[/tex]
In the molecule, the formal charge of Oxygen = -1.
In the molecule, the formal charge of Chlorine = +2
The oxygen atom has 8 electrons, in which 2 are shared in the bond formation, and 6 electrons are valence electrons.
The chlorine atom has 7 valence electrons in which 6 electron pairs are shared with the oxygen atom, and 1 lone pair has been available with Cl.
The structure of [tex]\rm ClO_3^-[/tex] molecule has been given in the image attached. The image shows the available lone pairs and the bonding in the structure.
Thus, the molecule has a formal charge of -1 on all oxygen atoms, and +2 on the Cl atom.
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how many moles of sulphur are in 53.7 grams of sulphur
Answer:
1.67 mol S
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
53.7 g S
Step 2: Define Conversions
Molar Mass of S - 32.07 g/mol
Step 3: Convert
[tex]53.7 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S} )[/tex] = 1.67466 mol S
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.67466 mol S ≈ 1.67 mol S
How you find a unknown element (just with the atomic emission spectrum)
Predict: Note the type of reaction you expect for
the sole reactant Na2CO3.
a. single replacement
b. double replacement
c. combustion (and synthesis)
d. synthesis
e. decomposition
Answer:
double replacement
Explanation:
Answer:
It is indeed double replacement
Explanation:
Can you think of a way you use the geometrical terms reflection and translation in real life?
I have aids ;-;
Answer:
building really complicated legos
Explanation:
What will happen to a salt water fish if placed in freshwater?
Answer:
they will die because they need to be in salt water
Which one of the following statements about orbitals is INCORRECT?
1) orbitals are regions in space where one is likely to find an electron
2) orbitals can hold up to two electrons
3) orbitals can hold two electrons provided they are spinning in the same direction
4) s, p, d and f orbitals are possible
3) orbitals can hold two electrons provided they are spinning in the same direction
We define an orbital in chemistry as a region in space where there is a high probability of finding an electron.
Each orbital holds a maximum of two electrons which spin in opposite direction according to Pauli exclusion principle.
According to this principle no two electrons can have the same set of quantum numbers. As a result, the spin quantum numbers of two electrons in the same orbital must differ hence they spin in opposite directions.
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A photon has an energy of 2.34x10-28 J. What is its frequency?
Answer:
f = 3.53×10⁵ s⁻¹
Explanation:
Given data:
Energy of photon = 2.34×10⁻²⁸ J
Frequency = ?
Solution:
h = 6.63 ×10⁻³⁴
Formula:
E = hf
2.34×10⁻²⁸ J = 6.63 ×10⁻³⁴ × f
f = 2.34×10⁻²⁸ J / 6.63 ×10⁻³⁴ Js
f = 0.353×10⁶ s⁻¹
f = 3.53×10⁵ s⁻¹
Cookware companies have been using a chemical called C-8, which helps to create a nonstick coating to pans. However, the Environmental Protection Agency (EPA) recently claimed that the use of C-8 in the manufacturing of nonstick cookware should be discontinued because studies show it causes cancer.
Who might benefit financially the most from the EPA’s claim?
OwO ^ ^ its A guys knowing cause i took the test
Answer:
C
Explanation:
cookware manufacturers who make pans out of steel only
Level 1: You are attempting to identify an unknown substance. Use the table to
answer the questions below.
Substance
Formula
Mass,
Color
Physical
State
Density Boiling
. (g/cm) Point,
Methane
CH
16.0
Gas
Colorless
0.423
-161.5
Ammonia
NH,
17.0
Gas
Colorless
0.70
-33
Unknown
???
???
???
???
???
???
Propane
CH
Gas
Colorless
0.493
-42.1
Bromine
Br.
159.8
Liquid
Red
4.04
58.8
Lithium
Li
6.94
Solid
0.534
1342
Silvery,
white
metal
Magnesium Mg
24.3
Solid
1.74
1090
Silver,
white
metal
Difference between bouyancy and density
Answer:
what She said but better
uses of ethanol as a reagent
Reagent in synthetic organic chemistry and chromatography. Industrial and laboratory organic solvent. Other uses are in manufacture of denatured alcohol, pharmaceuticals (rubbing compounds, lotions, tonics, colognes), in perfumery. Octane booster in gasoline.
Rain freezes as it hits the ground to form solid water is this a physical change or chemical change?
a. Physical change
b. Chemical change
Can someone help me answer this I will give your brainliest
Answer:
It is Physical Change
Explanation:
Because it is just water turning into another substance of water, nothing chemical is happening.
What is the mass of 0.0467 mol of the element sodium (Na)
Answer:
Explanation:
All periodic tables list different amounts of elemental masses. I'm going to round Sodium to 23
1 mol of sodium = 23
0.0467 mol sodium = x
Cross multiply
1*x = 0.0467 * 23
x = 1.0741 grams