What is the frequency of a photon whose energy is 3.4 x 10-19 J?
Answer:
5.13×¹⁴ Hz
Explanation:
The following data were obtained from the question:
Energy (E) = 3.4×10¯¹⁹J
Frequency (f) =?
Energy and frequency are related by the following formula:
E = hf
Where:
E is the energy.
h is the Planck's constant.
f is the frequency.
Thus, we can obtain the frequency of the photon by using the above formula as illustrated below:
Energy (E) = 3.4×10¯¹⁹J
Planck's constant (h) = 6.63×10¯³⁴ Js
Frequency (f) =?
E = hf
3.4×10¯¹⁹ = 6.63×10¯³⁴ × f
Divide both side by 6.63×10¯³⁴
f = 3.4×10¯¹⁹ / 6.63×10¯³⁴
F = 5.13×¹⁴ Hz
Thus, the frequency of the photon is 5.13×¹⁴ Hz.
Element X has an average atomic mass of 64.32 amu. If this element consists of only two isotopes, X-64 and X-65, which isotope is present in the greater abundance? Explain how you can tell.
Answer:X-64 is closer to the atomic mass of 64.32 amu. The one on the periodic table is the isotope most common in nature.
Explanation:
The average atomic mass of an element can be calculated from the percentage abundance and atomic masses of its isotopes. The atomic mass of the element is 64.32 amu which is near to the mass of X-64. Thus the percentage abundance of X-64 will be greater.
What is isotope?Isotopes are atoms of same atomic number and different mass numbers. There many elements which are having both stable and unstable isotopes. The unstable isotopes may undergo radioactive decay and forms a new stable isotope.
Let the fraction of abundance of X-64 be x and the that of X-65 is 1-x. Since total is 100%. Now,
64 (x) + 65 (1-x) = 64.32
x = 0.68.
Thus percentage abundance of X-64 is 68 % and that of X-65 is 100 - 68 = 32 %.
Therefore, the percentage abundance of the element X with isotopes X-64 is having greater abundance.
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You place a ton of radioactive material into a lead box and close the box.
What radioactive decay particle(s) will escape the box?
Answer:
Beta particles and neutrons
Explanation:
Lead is not particular good for shielding beta particles and neutrons. Lead shielding is used for shielding x-rays and gamma-rays due to its high density and atomic mass.
Materials made with lead are used by people dealing with all kinds of radioactive particles to prevent radioactive poisonings.
But lead cannot effectively protect against beta particles and neutrons.
Question 16
Which of the following is an example of a chemical property of matter?
А
reaction with another element
B
density of an element
C
color of an element
D
freezing point of element
Explanation:
A reaction with another element
other choices are physical property
Answer:
A. reaction with another element
Acceleration of an object
Answer:
velocity
Explanation:
The definition of acceleration is: Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
Which statement best explains the energy change that will occur when the
ball hits the catcher's mitt?
O A. The ball and the catcher's mitt will both transform each other's
potential energy to kinetic energy.
B. The catcher's mitt will transform the ball's kinetic energy to
potential energy.
C. The ball and the catcher's mitt will each transfer potential energy
to the other.
D. The ball will transfer kinetic energy to the catcher's mitt.
SUBMIE
Answer:the answer is D
Explanation:
I have already taken the exam. Hope this helps
The kinetic energy of the ball is transmitted to the catcher's mitt and the total energy remains conserved.
What is Energy?It is defined as the capability of a body for doing work. Its SI unit is joules. Example - Kinetic energy, potential energy, heat energy etc.
Given is that a ball hits the catcher's mitt.
Now, when ball is in the motion in the air than it is moving with some velocity. Assume that velocity to be v m/s. Then, its kinetic energy will be -
E[K] = 1/2mv²
Therefore, it has kinetic energy. Now as the ball is caught by the player, the ball stops and its kinetic energy is transmitted into the player's mitt. From law of conservation of energy
E[K] + E[mitt] = E[mitt] + E[K]
1/2mv² + 0 = 1/2mv² + 0
So the energy is conserved and transferred.
Thus, the kinetic energy of the ball is transmitted to the catcher's mitt.
Therefore, the kinetic energy of the ball is transmitted to the catcher's mitt and the total energy remains conserved.
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A 26.9 g rock rolls down the Hill at a speed of 81.9 m/s. what is the kinetic energy of the rock?
Answer:
90.21 J
Explanation:
Given that,
Mass of a rock, m = 26.9 g = 0.0269 kg
Speed of the rock, v = 81.9 m/s
We need to find the kinetic energy of the rock. It can be calculated using the formula as follows :
[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.0269\times 81.9^2\\\\E=90.21\ J[/tex]
So, the kinetic energy of the rock is 90.21 J.
Write a complete balanced equation for: magnesium(s) + chloric acid (aq) ? + ?
Based on electronegativity, select the molecule with the most ionic character. Group of answer choices SBr2 OBr2 SeCl2 TeI2 SCl2
Answer:
OBr₂
Explanation:
The ionic character depends on the difference of electronegativity between the elements. The higher ΔEN, the greater the ionic character.
SBr₂
ΔEN = |EN(S)-EN(Br)| = |2.5-2.8| = 0.3
OBr₂
ΔEN = |EN(O)-EN(Br)| = |3.5-2.8| = 0.7
SeCl₂
ΔEN = |EN(Se)-EN(Cl)| = |2.4-3.0| = 0.6
TeI₂
ΔEN = |EN(Te)-EN(I)| = |2.1-2.5| = 0.4
SCl₂
ΔEN = |EN(S)-EN(Cl)| = |2.5-3.0| = 0.5
OBr₂ is the molecule with the most ionic character.
The diagram shows a conglomerate (mixture) rock. Some of the rock particles are labeled. State which rock group this conglomerate belongs to and explain your answer.
True or false: Protons have a positive charge, while electrons have a negative charge.
The answer is TRUE
Protons do have positive charge while electrons have a negative charge
The heat capacity of solid iron is 0.447 J/gËC. If the same quantity of energy were transferred to a 450 g chunk of iron at 20ËC, what would be the final temperature?
Answer:
[tex]T_f=343.14^{\circ} C[/tex]
Explanation:
Given that,
The heat capacity of solid iron is 0.447 J/g°C.
Mass, m = 450 g
Initial temperature, [tex]T_i=20^{\circ} C[/tex]
Let the heat transferred, Q = 65 kJ
We need to find the final temperature. The heat transferred is given by :
[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q+mcT_i=mcT_f\\\\T_f=\dfrac{Q+mcT_i}{mc}\\\\=\dfrac{65000+450\times 0.447\times 20}{450\times 0.447}\\\\=343.14^{\circ} C[/tex]
So, the final temperature is [tex]343.14^{\circ} C[/tex].
The final temperature of the iron after the heat transfer of 65 kJ will be 343.14 [tex]\rm ^\circ C[/tex].
The specific heat is the amount of heat required to raise the temperature of 1 g of substance by 1-degree celsius.
The specific heat can be given by:
Q = mc[tex]\Delta[/tex]T
Q = specific heat = 65 kJ
c= heat capacity = 0.447 J/g [tex]\rm ^\circ C[/tex]
m = mass of the iron = 450 g
[tex]\Delta[/tex]T = change in temperatue = final temperature - initial temperature
[tex]\Delta[/tex]T = final temperature - 20 [tex]\rm ^\circ C[/tex]
Putting the values in the equation:
65000 J = 0.447 J/g [tex]\rm ^\circ C[/tex] [tex]\times[/tex] 450 g
65000 J = 201.15 [tex]\times[/tex] ( final temperature - 20 [tex]\rm ^\circ C[/tex] )
Final temperature - 20 [tex]\rm ^\circ C[/tex] = 323.14
Final temperature = 343.14 [tex]\rm ^\circ C[/tex].
The final temperature of the iron after the heat transfer of 65 kJ will be 343.14 [tex]\rm ^\circ C[/tex].
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what are the minerals responsible for the production of co2 gas in the kiln
Answer:
Explanation:limestone
CO2 is emitted from the calcination process of limestone, from combustion of fuels in the kiln, as well as from power generation.
2 You have 500 cm of a liquid
and 500 cm3 of a gas. You
place the liquid and the gas
into separate litre bottles. Do
the liquid and the gas occupy
the same volume in the two
bottles? Explain your answer.
Answer:
No
Explanation:
The gas will have more volume compared to the liquid.
Gases have no definite shape and no volume. They simply assume the shape of any container they are placed into. They will fill up the entirety of the bottle they are placed into.
Liquids have fixed volume although they do not have fixed shape. As they are held with weak intermolecular interactions, they are limited in space.
Therefore, they will maintain that initial volume at which they were introduced into the container.
Liquids generally have a fixed volume and gases do not.Which of the following are most reactive?
I Need Help!!! 50 POINTS AND BRAINLIEST!!! Fill out the study guide ASAP!!!
Please and thank you. (If you give me all of the correct answers I will create a 100 point question for you.
Answer: I saw the other question with screen shot Thanks
4. Answer, Like gases, plasmas have no fixed shape or volume, and are less dense than solids or liquids. But unlike ordinary gases, plasmas are made up of atoms in which some or all of the electrons have been stripped away and positively charged nuclei, called ions, roam freely.
5. Answer The energy associated with an object's motion is called kinetic energy. A speeding bullet, a walking person, and electromagnetic radiation like light all have kinetic energy. Another example of kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules.
6.Answer is solid
Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
7. Answer Water behaves differently to most other substances because, in its solid state (ice), its particles are less densely packed than in its liquid state. This is why ice floats.
8. Answer 212 degrees F.
Sea Level: Water boils at 212 degrees F. and simmers at 190 degrees F.
9. Answer When an object is heated the motion of the particles increases as the particles become more energetic. If it is cooled the motion of the particles decreases as they lose energy.
10. Answer CHEMISTRY TERM PHASE CHANGE
Fusion/Melting Freezing Vaporization/Boilin Condensation Sublimation Deposition Solid to a Liquid Liquid to a Solid Liquid to a Gas Gas to a Liquid Solid to a Gas Gas to a Solid
11. Answer is Energy is consumed (endothermic) to melt ice (solid to liquid) so the opposite process (liquid to solid) must be exothermic.
12.In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
ok alright. But where’s the question?
Evolution is a
a. idea b. hypothesis c. theory d. law
Answer:
C
Explanation:
Evolution Is a theory.
In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data. A law is a statement about an observed phenomenon or a unifying concept.
And for sure it's not just an idea because It was proven by many exhibit.
which element exists as a diatomic molecule at STP
The elements with standard temperature ,pressure, are the diatomic molecules like hydrogen, nitrogen, chlorine and oxygen.
What is diatomic molecule ?Two atoms are chemically linked in order to create diatomic molecules. They make up a homonuclear diatomic molecule if the two atoms are the same, such in the oxygen molecule (O2), for example in the case. If the atoms are different.
Diatomic molecules are two-atom-only molecules, which can contain the same or different chemical components. A diatomic molecule is a structure made up of two atoms that were already connected together. Examples include carbon monoxide, oxygen, nitrogen, and hydrogen (H2) (CO).
Thus, hydrogen, oxygen, nitrogen are the element exists as a diatomic molecule at STP.
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In what form is carbon found in the atmosphere?
Answer:
In the atmosphere carbon is found as carbon dioxide
Explanation:
what happens when you push on the wall of a building?
science force and motion?
Answer:
the wall pushes back on you with a FORCE equal in strength to the force you exerted.
How many atoms are in 2.3 moles Au?
Answer:
6.02×10^23atoms of au
Answer:
i think 3
Explanation:
A student measures a volume as 25 ml, wheras the correct volume is 23 mL. What is the percent error?
Answer:
the other number is different
Explanation:
The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas,
if the pressure in the container is kept constant?
A) 210. mL
B) 1170 mL
C) 0.0095 mL
D) 0.0470 mL
Can you use mass and volume to predict whether an object will sink or float in water? Explain your thinking.
Answer:
Yes. u can because its easy to tell if an item will sink or float usually by the weight or the width
Explanation:
Which forces can be classified as intramolecular?
London dispersion forces
van der Waals forces
hydrogen bonds
covalent bonds
Answer:
D) Covalent Bonds
Explanation:
Quizlet says so
Among the given options the intramolecular force is covalent bonding. Covalent bond is formed between two nonmetals by sharing of electrons. All other given forces are intermolecular.
What is covalent bonding ?A covalent bond is formed between two non-metals through sharing of valence electrons between atoms. For example carbon and oxygen are non metals forming the covalent compound CO.
The number of shared pair of electron depends on the valence of each atoms. For example in HCl, both atoms shares one electron to each other.
In a covalent compound, if the difference in electronegativity between two atoms is significant, the shared pair of electrons attracts towards the highly electronegative atom and resulting charge separation make them polar compounds.
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QUICK! Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?
A: The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.
B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
C: The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.
D: The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.
Answer:
B. The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
Got it correct on edge
Answer:
the answer is B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
I took the test
how is the weighted average mass related to atomic mass
Answer:
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons. The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.
calculate the percent by mass of 4.35g of Na I dissolved in 105g of water
We are given:
Mass of Na added = 4.35 grams
Mass of water = 105 grams
Mass Percent of Na:
Total mass of the solution = mass of solute + mass of solvent
Total mass of the solution = 4.35 + 105 = 109.35 grams
Mass percent of solute = (mass of solute / mass of solution) * 100
Mass percent of Solute = (4.35 / 109.35) * 100
Mass percent = 3.978 %
f the solubility of sodium chloride (NaCl) is 30.6 g/100 mL of H2O at a given temperature, how many grams of NaCl can be dissolved in 250.0 mL of H2O
Answer:
76.5 grams
Explanation:
Solubility of sodium chloride = [tex]\dfrac{30.6}{100}=0.306\ \text{g/mL}[/tex]
Now volume of water is 250 mL
We have to find the amount of NaCl that can be dissolved in the above mentioned amount of water
Let the mass of NaCl that can be dissolved be m so
[tex]\dfrac{m}{250}=0.306\\\Rightarrow m=250\times0.306\\\Rightarrow m=76.5\ \text{g}[/tex]
The mass of NaCl that can be dissolved is 76.5 grams.
The definition of is the study of quantitative relationships between the amounts of reactants and products.
a)chemical equations
b) stoichiometry
c) molar mass
d)coefficient
Answer:
b) stoichiometry
Explanation:
Stoichiometry is the study of quantitative relationships between the amounts of reactants and products.
The word is coined from two Greek words; stoicheon which means atom and metron which means measurement. It deals with chemical calculations based on the elementary particles of matter. Such calculations highlights the relationships between the composition or chemical reactions of matter and the mole.