Answers
Answer:
λ = 5.56 × 10⁻³ m
Explanation:
You have to use the formula c = λv to solve the problem. Review what you are given. You are given v and c, where v = 5.40 × 10¹⁰ Hz and c = 3.00 × 10⁸ m/s. The value c is for the speed of light and is something you need to memorize. You will use it often in physics and sometimes in chemistry.
Now that you figured out what you know, you can see that there is only one unknown, allowing you to solve.
c = λv
λ = c/v
λ = (3.00 × 10⁸ m/s)/(5.40 × 10¹⁰ Hz)
λ = 5.56 × 10⁻³ m
Related Questions
What is the formula in finding Stress?
Answers
Explanation:The unit is -
o
I
I hope it helped you.
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The temperature of water decreases on the dissolution of NH4NO3. From this observation, we can conclude that the solution process would be best described asa)exothermic with a positive entropy change.b)exothermic with a negative entropy change.c)endothermic with a negative entropy change.d)endothermic with a positive entropy change.e)exothermic with a negative free energy change
Answers
Answer: d)endothermic with a positive entropy change
Explanation:
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
As temperature of water decreases on dissolution of \(NH_4NO_3\) , it means heat has been absorbed by \(NH_4NO_3\) during dissolution and that heat is taken from water. Thus process is endothermic. As dissolution will lead in the formation of ions \(NH_4^+\) and \(NO_3^-\) , randomness will increase and thus there is a positive entropy change.
2 A high school student takes a lump of magnesium with a volume of 150.0 mL and adds it to a beaker of
an aqueous solution of aluminum nitrate. What is the mass of the solid aluminum that forms?
Solid magnesium has a density of 1.738 g/cm³.
Answers
The mass of the solid aluminum that forms are 192.73 grams
To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.
The balanced chemical equation is:
3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al
The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.
To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:
Mass = Volume × Density
Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g
Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:
Moles of magnesium = Mass of magnesium / Molar mass of magnesium
= 260.7 g / 24.31 g/mol
= 10.72 mol
According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:
Moles of aluminum = (2/3) × Moles of magnesium
= (2/3) × 10.72 mol
= 7.15 mol
Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):
Mass of aluminum = Moles of aluminum × Molar mass of aluminum
= 7.15 mol × 26.98 g/mol
= 192.73 g
Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.
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Consider the reaction, C2H4(g) + H2(g) → C2H6(g), where ΔH = –137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts? show your work
Answers
Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 55.3 g of C₂H₄ reacts is 270.575 kJ.
Definition of enthalpy of a chemical reactionThe enthalpy of a chemical reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction at constant pressure.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
A reaction is called exothermic if its enthalpy of reaction is negative (that is, if the system gives up heat) and endothermic if its enthalpy is positive (that is, if the system absorbs heat).
Heat in this caseIn this case, the balanced reaction is:
C₂H₄ (g) + H₂ (g) → C₂H₆ (g)
and the enthalpy reaction ∆H° has a value of -137 kJ.
This equation indicates that when 1 mole of C₂H₄ reacts with 1 mole of H₂, 137 kJ of heat is released.
Now, 55.3 g of C₂H₄ reacts. Being the molar mass of C₂H₄ is 28 g/mol, the amount of reacting moles of the compound is calculated as:
amount of moles= 55.3 g÷ 28 g/mole
amount of moles= 1.975 moles
Then you can apply the following rule of three: if 1 mole of C₂H₄ releases 137 kJ of heat, 1.975 moles of C₂H₄ releases how much heat?
heat= (1.975 moles of C₂H₄× 137 kJ)÷ 1 mole of C₂H₄
heat= 270.575 kJ
Finally, the quantity of heat released is 270.575 kJ.
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How many moles of
Cts are needed to make
15.5 moles of CO₂? How
much O2 will be needed?
0₂
C₂Hs +50₂3CO₂ + 4H₂O
Answers
1. The number of mole of C₃H₈ needed to make 15.5 moles of CO₂ is 5.2 moles
2. The number of moles of O₂ needed is 25.8 moles
1. How do I determine the number of mole of C₃H₈ needed?The number of mole of C₃H₈ needed can be obtained as illustrasted below:
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
From the balanced equation above,
3 moles of CO₂ was obtained from 1 mole of C₃H₈
Therefore,
15.5 moles of CO₂ will be obtain from = (15.5 × 1) / 3 = 5.2 moles of C₃H₈
Thus, number of mole of C₃H₈ needed is 5.2 moles
2. How do I determine the number of mole of O₂ needed?We can obtain the number of mole of O₂ needed as follow:
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
From the balanced equation above,
3 moles of CO₂ was obtained from 5 moles of O₂
Therefore,
15.5 moles of CO₂ will be obtain from = (15.5 × 5) / 3 = 25.8 moles of O₂
Thus, number of mole of O₂ needed is 25.8 moles
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Complete question:
How many moles of C₃H₈ are needed to make
15.5 moles of CO₂? How much O₂ will be needed?
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
Which best explains why an Al 3+ ion is smaller than an Al atom?
In forming the Al³+ ion, the Al atom loses the electrons in its outermost energy
level, causing a decrease in the atomic radius.
In forming the Al3+ ion, the Al atom gains three protons and the resulting net
positive charge keeps the electrons more strongly attracted to the nucleus,
reducing the radius.
The Al3+ ion contains more electrons than the Al atom, which results in a greater
attraction for the nucleus and a smaller atomic radius.
In forming the A13+ ion, the Al atom adds electrons into a higher energy level,
causing a decrease in the atomic radius.
There are more protons in an Al3+ ion than there are in an Al atom.
Answers
In forming the Al³⁺ ion, the Al atom loses the electrons in its outermost energy level, causing a decrease in the atomic radius, hence option A is correct.
The number of protons in the nucleus of AlandAl3+ AlandAl3+ is the same, however there are differing numbers of electrons in the final shell. Al³⁺ is smaller than Al because it has fewer electrons.
The Al atom will become an Al³⁺ ion when it loses its third electron and develops a tri-positive charge on it. In forming the Al³⁺ ion, the Al atom loses the electrons in its outermost energy level, causing a decrease in the atomic radius.
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prop-1-yne + 2HBr/H2O2 = A;
A + 2H2O = B;
B + K2CO3(aq) = C;
C + heat = D;
D + HBr = E.
find the compounds A, B, C, D and E
Answers
Based on the given reactions, the compounds are as follows:
A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.
B: The product formed when compound A reacts with 2H2O.
C: The product formed when compound B reacts with K2CO3(aq).
D: The product formed from the heat-induced reaction of compound C.
E: The product formed when compound D reacts with HBr.
Based on the given reactions, let's analyze the compounds involved:
Reaction 1: prop-1-yne + 2HBr/H2O2 = A
The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.
Reaction 2: A + 2H2O = B
Compound A reacts with 2H2O (water) to form compound B.
Reaction 3: B + K2CO3(aq) = C
Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.
Reaction 4: C + heat = D
Compound C undergoes a heat-induced reaction to form compound D.
Reaction 5: D + HBr = E
Compound D reacts with HBr (hydrobromic acid) to form compound E.
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can someone explain how to do T-Test and Q-Test
Answers
In order to determine whether there is a significant difference between two samples, the Student's t-test examines their mean and standard deviation.
For beginners, how do you interpret t-test results?A significant t-score, also known as a t-value, denotes a difference between the groups, whereas a small t-score denotes similarity. Degrees of freedom are the values in a research that have the flexibility to change, and they are crucial for determining the significance and reliability of the null hypothesis.
This test is used when specimens from two distinct populations, species, or groupings are compared and analyzed. The independent T-test is another name for it.
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Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
(
)O2 → (
)O3
Answers
Answer:
3
2
Explanation:
3O2 => 2O3
the equation is balancing
Answer fast please!!
A calorimeter contains 600 g of water at 25°C. You place a hand warmer containing 300 g of liquid
sodium acetate inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of
the water inside the calorimeter is 36.4°C. The specific heat of water is 4.18 J/g-°C. What is the enthalpy
of fusion (AH) of the sodium acetate? (Show your work.) Where necessary, use q = mH₁.
Answers
The enthalpy of fusion of sodium acetate is approximately -93.64 J/g.
To calculate the enthalpy of fusion (ΔH) of sodium acetate, we can use the principle of energy conservation. The heat lost by the hand warmer during the crystallization process is equal to the heat gained by the water in the calorimeter.
First, let's calculate the heat gained by the water in the calorimeter using the formula q = m × c × ΔT, where q is the heat gained or lost, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.
q_water = m_water × c_water × ΔT_water
Given:
m_water = 600 g
c_water = 4.18 J/g-°C
ΔT_water = 36.4°C - 25°C = 11.4°C
q_water = 600 g × 4.18 J/g-°C × 11.4°C
q_water = 28092 J
Since the heat lost by the hand warmer during crystallization is equal to the heat gained by the water, we can write:
q_water = q_handwarmer
Now, let's calculate the heat lost by the hand warmer using the same formula:
q_handwarmer = m_handwarmer × c_handwarmer × ΔT_handwarmer
Given:
m_handwarmer = 300 g
c_handwarmer = unknown (specific heat capacity of sodium acetate)
ΔT_handwarmer = 36.4°C - initial temperature of sodium acetate
Since the sodium acetate undergoes crystallization, its temperature remains constant during this phase change. The temperature at which crystallization occurs is known as the freezing point of sodium acetate, which is approximately 58°C. Therefore:
ΔT_handwarmer = 36.4°C - 58°C = -21.6°C
Now, we can substitute the known values into the equation:
q_water = q_handwarmer
28092 J = 300 g × c_handwarmer × -21.6°C
To solve for c_handwarmer, we rearrange the equation:
c_handwarmer = -28092 J / (300 g × -21.6°C)
c_handwarmer ≈ 5.47 J/g-°C
The specific heat capacity of sodium acetate (c_handwarmer) is approximately 5.47 J/g-°C.
The enthalpy of fusion (ΔH) can be calculated using the equation ΔH = q_handwarmer / m_handwarmer:
ΔH = -28092 J / 300 g
ΔH ≈ -93.64 J/g
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What is thirty plus one equal
Answers
Answer:
31
Explanation:
30+1=31
A device which make work easy it call
Answers
Define critical point. Group of answer choices The temperature and pressure below which a supercritical fluid exists. The temperature and pressure above which a supercritical fluid exists. The temperature and pressure are equal. The temperature and pressure are not equal. The temperature and pressure where liquid, solid, and gas are equally stable and are in equilibrium.
Answers
Answer:
The temperature and pressure below which a supercritical fluid exists.
Explanation:
Critical point is a region on the phase diagram where fluid phases (liquids and gases) have the equal density.
This is caused by increased temperature and pressure of the fluid particles in a confided container. Supercritical fluids exist in a state above critical point.
I hope this explanation was clear.
Which is the best example that something has potential energy?
1
a car parked on a steep hill
a tennis ball rolling across the court
a picture hanging on the wall
a piece of coal
Answers
Design a controlled experiment to test your hypothesis. A controlled experiment is one that only tests one variable. All other variables must remain the same. Make a drawing below that shows how you will set up your experiment. Then, write a description of the one factor that will vary and the two factors that will remain the same.
Answers
The problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
What is an experiment?An experiment is a procedure used to verify a working hypothesis obtained by applying the scientific method.
Experimental variables that can be tested include, for example, temperature, amount of product from a chemical reaction, etc.
In conclusion, the problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
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Differences between voltage, current and resistance?
Answers
Answer:
Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.
Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.
Hope this helps!
Some properties of substance X are listed. ●It conducts electricity when molten. ●It has a high melting point. ●It burns in oxygen and the product dissolves in water to give a solution with pH 11. what is X? A a covalent compound B a macromolecule C a metal D an ionic compound
Answers
An ionic compound is one that dissolves in water to produce a solution with a pH of 11, has a high melting point, conducts electricity when molten, and burns in oxygen.
What are ionic compounds, exactly?Positively charged ions, which are sometimes called as cations, and negatively charged ions, also called as anions together constitute an ionic compound, which are neutral substances. The name of the cation is written first, followed by the name of the anion, in case of binary ionic compounds (ionic compounds that only contain two types of elements).
What is the difference between covalent and ionic compounds?An atom can establish bonds with other atoms in two main ways: covalent and ionic. Sharing of electrons between two or more atoms is involved in case of covalent bonding. When two or more ions come together, they can form ionic bonds that are held together by charge differences.
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Which structure of the skeletal system holds bones together?
joint
ligament
cartilage
Answers
Explanation: Ligaments: Made of tough collagen fibers, ligaments connect bones and help stabilize joints.
Answer:
The answer is ligament
Explanation:
Hope that helps!
how does Hanukkah relate to science?
Answers
Answer:
oil = burn for 8 days = absurd = doesnt make sense but it happened lol
Explanation:
What forms of energy are produced when
fossil fuels burn?
Answers
When fossil fuels burn, several forms of energy are produced, including:
Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.
Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.
Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.
Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.
It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.
When you put the lid on the simmering soup, the inside of the lid gets all wet. Identify the change of state of the inside of the lid
Answers
Answer:
The soup gets so hot it releases a gas state and it gets trapped in the lid. So the gas gets transformed into a gas into a liquid temperarily.
Explanation:
A pregnant client experienced preterm labor at 30 weeks gestation. Upon assessing the client the nurse finds that the newborn is at risk of having cerebral palsy. Which medication administration should the nurse perform to prevent cerebral palsy in the newborn?
A. Calcium gluconate.
B. Magnesium sulfate.
C. Glucocorticoid drugs.
D. Antibiotic medications
Answers
The medicine that has to be given by the nurse to prevent cerebral palsy in the new-born is magnesium sulphate.
The term "cerebral palsy" refers to a collection of conditions that impair mobility and posture development and are thought to be caused by non-progressive abnormalities. Insults that caused cerebral palsy are thought to have happened during foetal development or early childhood. A significant risk factor for cerebral palsy is preterm delivery, and that risk rises sharply as gestational age decreases. Right now, 25% of all new occurrences of cerebral palsy are caused by babies delivered before 34 weeks of pregnancy. Cerebral palsy risk is higher when there are several pregnancies. MgSO4 was infused continuously at a rate of 2 g/h for up to 12 hours after a 6 g loading dose. Given before delivery, magnesium sulphate is known to regulate the vasculature and minimize hypoxia effects by neutralising cytokine or excitatory amino acid damage, which may lower the risk.
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how would you prepare 750 ml of 50% alcohol,given 2000 ml 30% alcohol and 800 ml of distilled water. if you cannot with these reagents; propose a dilution with volumes that would give the desired product
Answers
We can combine the 2000 ml of 30% alcohol with the 800 ml of distilled water to get 750 ml of 50% alcohol. To get the appropriate 50% alcohol concentration, we'll need to figure out how much of the 30% alcohol and
All living things require the colourless, flavourless, and odourless liquid known as water. It is a versatile solvent that can dissolve a wide range of compounds, which makes it an essential component of numerous chemical and biological processes. Water circulates constantly through the environment through processes including evaporation, precipitation, and transpiration and is found in oceans, rivers, lakes, and underground reservoirs. It can be used for a variety of things, such as drinking, washing, and industrial procedures. Human health depends on having access to clean water, hence efforts are being undertaken to conserve and manage this limited resource wisely
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calculate the density of the object that has a mass of 5.0 g and occupies the volume of 10.0 cm3
Answers
In this problem, you just need to divide 5.0g by 10.0cm³.
Density = 5.0g/10.0cm³= 0.5gcm^-3
the pressure on 20 milliliters of a gas at constant temperature is changed from 4 atmospheres to 2 atmospheres. what is the new volume of the gas?
Answers
The new volume of the gas whose pressure was changed would be = 40 milliliters.
How to calculate the new volume of the given gas?The initial volume(V1)of the gas= 20ml
The initial pressure(P1) = 4 atm
The final pressure(P2) = 2 atm
The final volume(V2) = ?
Using the general gas formula;
P1V1 = P2V2
V2 = P1V1/P2
= 4×20/2
= 40ml
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how does increasing the height of an object affect its mechanical energy
Answers
Answer:
The amount of work required to raise the TV from point A to point B is equal to the amount of gravitational potential energy the TV gains from its height above the ground. This is generally true for any object ...
So it adds more kinetic energy when height is added.
A solution of rubbing alcohol is 76.4% (v/v) isopropanol in water. How many milliliters of isopropanol are in 89.6 mL sample of the rubbing alcohol solution?
Answers
Answer:
68.4 mL of isopropanol
Explanation:
vol of solute/vol of solution ×100%=76.4% isopropanol
.764×89.6mL = 68.4 mL
a student mixed 20 grams of salt into a beaker with 200 milliliters of warm water. then, the student set the cup of saltwater on a windowsill undisturbed for one week. what changes did the student observe? include what happened when salt was mixed with warm water and what most likely happened to the saltwater after one week.
Answers
Answer:
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Explanation:
Water can be decomposed into its constituent elements, 2 H2O(l) → 2 H2(g) + O2(g), with an electrical current in a process called electrolysis. If 1.2 g of H2O is subjected to electrolysis and the products are collected in a cylinder with a volume of 0.20 L and a temperature of 30 °C, what is the partial pressure of H2?
Answers
The number of moles of hydrogen gas produced from 1.2 g of water is 0.06 moles. Then, the partial pressure of hydrogen gas is 4.9 atm.
What is partial pressure ?The partial pressure of a gas in a mixture is the contribution of the gas to the total pressure of the mixture.
The molar mass of water = 18 g/mol
mass = 1.2 g
number of moles = 1.2/18 =0.06 moles.
now the total pressure p = nRT/v
V = 0.20 L
T = 30°C =303 K
then p = (0.06 mol × 0.082 L atm/ K mol × 303 K) / 0.20 L = 7.4 atm.
Now, 2 moles of water gives 2 moles of hydrogen gas and one mole of oxygen. Then 0.06 moles of water gives 0.06 moles of hydrogen and 0.03 moles of oxygen.
Then, mole fraction of hydrogen = 0.06/(0.03 + 0.03) = 0.66.
Partial pressure of hydrogen = total pressure × mole fraction
= 0.66 × 7.4 atm = 4.9 atm.
Therefore, the partial pressure of hydrogen gas is 4.9 atm.
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A student adds sugar, spices, and salt to a bowl of peanuts and stirs them together. What has the student made?
a compound
a substance
a mixture
a solution
Answers
Answer:
A mixture
Explanation:
Since they add multiple ingrediants and then stir them that makes it a mixture because they are mixing it.
Hope this helps :)