Answer:
1) The frequency of each photon is 3.0 × 10⁹ Hz
2) The energy of each photon is 1.98786 × 10⁻²⁴ J
Explanation:
The energy, 'E', in a photon of light is given by Planck's equation as follows;
E = h·f = h·c/λ
Where;
E = The energy of a photon
h = Planck constant = 6.6262 × 10⁻³⁴ J·s
f = The frequency of the photon/radiation
c = The speed of light = 3.0 × 10⁸ m/s
λ = The wavelength of the photon/radiation
The given parameters of the microwave are;
The wavelength, λ = 10 cm = 0.1 m
The type of wave = Microwave
1) From E = h·f = h·c/λ, we find that the frequency, 'f' equals c/λ
∴ f = 3.0 × 10⁸ m/s/(0.1 m) = 3.0 × 10⁹ 1/s = 3.0 × 10⁹ Hz
The frequency of each photon, f = 3.0 × 10⁹ Hz
2) From E = h·f = h·c/λ, the energy, 'E', of each photon is given as follows;
E = h·c/λ = 6.6262 × 10⁻³⁴ J·s × 3.0 × 10⁸ m/s/(0.1 m) = 1.98786 × 10⁻²⁴ J
The energy of each photon, E = 1.98786 × 10⁻²⁴ J
identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid being titrated is less than the concentration of its conjugate base.
The acids do not completely dissociate in water. So, they tend to form a buffer system. Above pH 3.5, the concentration of the conjugate base is more than the concentration of the acid.
Weak acids: These are the acids that do not completely dissociate in water. So, they tend to form a buffer system.Buffers are used to resist a slight change in pH. The pH is equal to the pKa of the solution at equivalence.At equivalence, the concentration of weak acid and its conjugate base is equal.After the equivalence point, the concentration of the conjugate base is more than the concentration of the acid.
Therefore, after 3.5 the concentration of the conjugate base is more than the concentration of the acid.
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the atoms in the same period on the periodic table all have what ?
A - The same abbreviation
B - The same number of electron shells
C - the same number of electrons
D - the same number of electrons on the outer energy level
Answer:
B.
Explanation:
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
What two ways you can increase the frictional force between two objects?
( 8th grade )
Frictional force between two objects can be increased by:
i) making the surfaces rough
ii) increasing the mass of the object that ks moving.
Hope it helps you.
20 points to whoever can answer these 3 questions correctly
Pt. 2
Answer:
1. AlBr3
2. 2
3. sulfuric acid
Explanation:
This formula equation is unbalanced.
BaCl2(aq) + Na2CO3(aq) Right arrow. BaCO3(s) + NaCl(aq)
Which coefficient should be placed in front of NaCl to balance this equation?
1
2
3
4
Answer:
2
Explanation:
A chemical equation comprises of substances called reactants and other substances called products. The reactants combine together to form the products. However, according to the law of conservation of matter, the number of atoms of each element in the reactant side must be equal to that on the product side. This is called a BALANCED EQUATION.
However, to balance an equation, COEFFICIENTS are used to ensure the number of atoms of each element equate on both sides. In this question where the following unbalanced equation was given:
BaCl2(aq) + Na2CO3(aq) → BaCO3(s) + NaCl(aq)
It can be observed that the number of atoms of sodium (Na) does not equate on both sides. Hence, we use a coefficient of 2 on NaCl to equate them. The balanced equation reads:
BaCl2(aq) + Na2CO3(aq) → BaCO3(s) + 2NaCl(aq)
Answer:
2
Explanation:
Is the gravity a black hole strong enough to keep light from escaping True or False
Answer:
The gravitational pull of a black hole is so strong that nothing, not even light, can escape once it gets too close. ... Moving at close to the speed of light, these particles ricochet off the event horizon and get hurled outward along the black hole's axis of rotation
(True)
If I have 5.275 moles of gas at a temperature of 575 K and a pressure of 7.75 atmospheres, what is the volume of the gas?
Answer:
hi
Explanation:
2C3H6O + 8O2 --> 6CO2 + 6H2O
The combustion reaction for propanol is given above. How many moles of water are produced if 0.15 moles of propanol (C3H6O) reacts with an excess amount oxygen gas?
Please try to show work if possible!
Answer: 0.45 moles of [tex]H_2O[/tex] will be produced from 0.15 moles of propanol.
Explanation:
The balanced chemical reaction is:
[tex]2C_3H_6O+8O_2\rightarrow 6CO_2+6H_2O[/tex]
[tex]C_3H_6O[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
According to stoichiometry :
2 moles of [tex]C_3H_6O[/tex]produces = 6 moles of [tex]H_2O[/tex]
Thus 0.15 moles of [tex]V[/tex] will produce=[tex]\frac{6}{2}\times 0.15=0.45moles[/tex] of [tex]H_2O[/tex]
Thus 0.45 moles of [tex]H_2O[/tex] will be produced from 0.15 moles of propanol.
All stars evolve the same up through the red giant phase. What determines the life cycle path a star will take from there?
O The star's luminosity
O The star's composition
O The star's temperature
O The star's mass
Answer:
the star’s mass
Explanation:
the bigger the mass, the different lifestyle it will go through, our star will swell into a red giant then shed its outer layers until its a white dwarf then fade into a burned out cinder core.
what type of chemical reaction is this equation?
Answer:
Explanation:
It resembles a simple composition. Your instructor may not accept that answer. What is happening is the Fe is giving up 2 electrons so that it may embrace the C5H5.
That's usually what happens in a simple composition.
What makes me wonder is the C5H5. It has no charge and yet the Fe is shown as giving up 2 electrons. I'm guessing that either a halogen is introduced or something is to the left of C5H5 on the left side of the equation.
Anyway it is a composition of some kind.
Question 3 of 7
Which property of a mineral determines whether it can scratch a piece of
calcite?
a. streak
b. luster
c. hardness
d. reactivity
Answer:
C. Hardness
Explanation:
A P E X
PLEASE HELP ASAP
Aluminum oxide (Al2O3) and iron (Fe) react according to the following
balanced equation:
4Al2O3 + 9Fe + 3Fe304 + 8A|
If there are 10.2 grams of Al2O3 and 11.2 grams of Fe, which statement
identifies the limiting reagent in this reaction and best supports that claim?
Answer:
Fe is the limiting reagent
Explanation:
In a chemical reaction, the limiting reactant, also known as the limiting reagent. Therefore, the correct option is option C.
What is limiting reagent?In a chemical reaction, the limiting reactant, also known as the limiting reagent, controls how much product is produced. Calculating the percentage value of a reaction is achievable if the limiting reactant has been identified.
Because elements and compounds in an equilibrium chemical equation react in accordance with their mole ratios, there must be a limiting reactant. Therefore, when one of the reactants was present in a larger amount than the other and the mole ratio inside the balanced equation specifies that it takes 1 mole from each reactant to generate a product, the reactant existing in the lesser amount would be the limiting reactant.
4Al[tex]_2[/tex]O[tex]_3[/tex] + 9Fe [tex]\rightarrow[/tex] 3Fe[tex]_3[/tex]O[tex]_4[/tex] + 8A|
moles of Al[tex]_2[/tex]O[tex]_3[/tex] = 10.2 /101.96
=0.10moles
moles of Fe = 11.2/55.8
=0.20
Fe is the limiting reagent
Therefore, the correct option is option C.
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What is the slope of the line?
Deep, cold water has __________. Warm, shallow water has ___________.
low density; low density
high density; high density
low density; high density
high density; low density
Answer:
Deep cold water has a high density and warm, shallow water has a low density.
Explanation:
Because when it is cold, water shrinks together it acts as a factor for it to have a high density and it's deep which also acts as a factor because to deeper something is near the Earth's core the more pressure it has leads to high density as well because gravity is stronger near the Earth's core. When water is warm it has a low density which is the first factor and because it is shallow it is far from the earth's core it has a lower density and pressure.
State the 2 products formed when a metal reacts with water
Answer:
hydroxide and hydrogen
Explanation:
When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.
Answer: Hydrogen Gas ( H2)
Explanation: When metals react with water they form hydrogen gas which actually react and start to burn and make squeaky pop noises.
Balance the following equation:
Sg + F2 --> SF
Answer:
S+ F2 ⇒ SF
S=1
F =2
So S +F2 ......... 2SF
2S + F2 ..........2SF this is a balance equation
S=2 F=2 in left side s=2 F = 2 in rightside
Explanation:⇆
⇒
PLEASE HELP Is this a redox reaction?
Zn + 2 HCl → ZnCl2 + H2
Answer:
answer is #4
Explanation:
Zn^0 -------> Zn^2+ ,
H^1+ --------> H^0
When would scientists need to change a theory?
Answer:
if it cannot be made to fit the new findings
Answer:
As additional scientific evidence is gathered, a scientific theory may be modified and ultimately rejected if it cannot be made to fit the new findings; in such circumstances, a more accurate theory is then required.
Explanation:
please follow me
iammallikaIn order to become a chemically stable ion, a neutral atom of sodium will _______.
A. lose one electron
B. lose two electrons
C. gain two electrons
D. gain one electron
Answer:
D. gain one electron
Explanation:
In order to become a chemically stable ion, a neutral atom of sodium will gain one electron. Therefore, the correct option is option D.
What is chemical stability?Chemical stability in chemistry refers to a chemical system's thermodynamic stability. When a system reaches its lowest energy state or in thermodynamic equilibrium with its surroundings, thermodynamic stability occurs.
It could be a spontaneous process when the total number of atoms or molecules in a given shape is conserved despite the fact that individual particles or atoms change forms. In order to become a chemically stable ion, a neutral atom of sodium will gain one electron.
Therefore, the correct option is option D.
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What are the intermediate chemical equations for this reaction
Reaction 1
Reaction 2
Reaction 3
Answer:
REACTION 2
Explanation:
BEACUSE IT SYA IN THE QUESTION
Answer:
Reaction 1: Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
Reaction 2: MgO(s) + 2HCl(aq) -> MgCl2(aq) + H2O(l)
Reaction 3: H2(g) + ½ O2(g) -> H2O(l)
Explanation:
What causes rocks to change and form into new types of rocks?
Answer:
The three main rock types are igneous, metamorphic and sedimentary. The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
Gold has a molar mass of 197.0 g/mol. What is the concentration of gold in seawater in moles per liter?(please show work)
Answer:
Since you didnt get asked for a spefic weight of gold lets assume it was 5g
Explanation:
5g Au/197 =.02538 mols in 1 liter of sea water is
.02538/1L which gives you a Molarity of .012538 assuming 5g if they ask for a different number just replace 5 with any weight in grams
1. Carbon is important because:
A. it is part of the carbon cycle
B. it makes up part of all life forms on Earth
C. it is related to oxygen
D. it is found in excess in the ocean
Answer:
B
Explanation:
All organic material has carbon.
the answer is b. :)))))))))))))
El silicio está formado por un 93% del isótopo de masa atómica 28 uma un 4% del isótopo de masa atómica 29 uma y el resto por el isótopo de masa atómica 30 uma
Answer:
hhhhhhhhhhhhhhhhhhhhhhhhhhhh
Explanation:
Balance the following chemical equation:
i need F
Answer:
L2 add a for NAL add a 2 then for the first NA2 put a 4 and then the second NA2 put a 2 and it should be good
Explanation:
How do animal behaviors, such as hibernation or migration, enhance their survival?
Hibernation and migration are adaptations that animals use to sustain life during the winter months when demand outstrips supply. Hibernation occurs when animals rest or sleep for the entire winter. The movement of animals from one location to another is referred to as migration.
What is hibernation?Hibernation is a tactic by which animals conserve energy to survive in adverse weather conditions or a lack of food.
It is characterized by physiological changes such as a decrease in body temperature and a slowing of metabolism.
The movement of animals from one location to another is referred to as migration.
Hibernation and migration are adaptations that animals use to sustain life the winter months when demand outstrips supply.
Thus, animal behaviors, such as hibernation or migration, enhance organisms' chances of survival.
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explain the trend in boiling parts of the halogen
Answer:
The boiling point of the halogens increases as you go down the group. The halogens exist as diatomic molecules, with both atoms sharing an electron to completely fill the outer shell. The increase in boiling (and melting point) can be attributed to the increase in intermolecular forces (van der Waals).tion:
Help pls thnk you!!!!!!!!!!!!!!!!!
What are gravitational forces?
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects
The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe!
Gravitational force is the force that attracts to objects with mass. ... This forces tries to pull masses together, that is why attractive in nature. For example: When ball is thrown upwards it always come downwards after a certain height because the ball is pulled or attracted by the Earth's gravitation la force.
¯\_(ツ)_/¯
Answer:
Good Question!!! No one has found the answer to that question.
Explanation:
The force applied to a machine by a users is called the
Answer:
When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force.
it's called the input force
