Answer:
35.50 atomic mass
Explanation:
1. Multiplicate each isotope mass by its abundance
35 uma x 75% = 26.25 amu
37.01 uma x 25% = 9.2525 amu
2. Add the values
26.25 + 9.2525 = 35.50 atomic mass
Which phrase best describes a period on the periodic table?
a. elements that are in the same group
b. elements that have the same number of electrons
c. a column of elements
d. a row of elements
Answer:
d. a row of elements
Explanation:
Elements that are in the same group, have same number of electrons and make up a column in a periodic table.
[tex].[/tex]
The phrase which best describes a period on the periodic table is; a row of elements.
The elements in the periodic table are divided into rows and columns. The rows are called the periods while the columns are called the groups.
This means that a period is best described as a row of elements from the foregoing.
Therefore, the correct answer is option D: a row of elements.
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Which of the following describes a disconfirmed hypothesis?
it has been proven true
it has been poorly written and needs to be reformed
it has been proven false
it is not testable
HOTS
A container made of same metal when exposed to
humid climate develops green coating.
Identify the metal. Give reason for both a & b.
What is the change of state in which a gas becomes a liquid?
Answer:
Condensation
Explanation:
Answer:
Condensation
Explanation:
When a gas changes to a liquid it is known as condensation. It happens when molecules in a gas slowly reduce their movement speed.
HOPE THIS HELPED
What is the Color of trioxonitrate
Answer:
blue white green and brownn
Explanation:
seen one
The graph below shows the changes in the temperature of ice when it is heated from -20 °C to 100 °C.
Heat curve for ice. The graph shows the changes in the temperature of ice when it is heated from negative 20 degrees Celsius to 100 degrees Celsius. The label for the x-axis reads 'Addition of heat over time.' The label for the y-axis reads 'Temperature (degrees Celsius).' There are labels on the graph (from 'A' to 'E') that designate significant events while applying heat to the ice. Portion AB has a slight incline while increasing the heat from negative 20 degrees to 5 degrees; portion BC stays at 5 degrees for a while; portion CD steadily increases in temperature from 5 degrees to 100 degrees over a significant period of time; portion DE stays at 100 degrees for a while.
Based on the graph, which of these conclusions is correct?
Answer:
D
Explanation:
I did it on a quiz.
underline and identify the parts of the text on this page that use examples of how the flow of the matter through a system is driven by energy and can do the work.
The parts of the text on the page that use examples of how the flow of matter through a system is energy driven and has the capacity to do work are;
1) The flow of water down rivers passing through hydro power dams to perform the following works;
River bank particle erosionElectric power generation2) The flow of electrons that corresponds to the flow of electricity (in the reverse direction) to perform the following works;
Light bulbs turn onTelevisions are powered3) The lifting of the hammer by the cam which gains gravitational potential energy that is converted to kinetic energy as the hammer drops
The hammer is repeatedly lifted and dropped by the cam to do the following work
Hammering a metal piece into shape4) The chemical potential energy stored in bonds by virtue of the relative atomic distances which produces kinetic energy from the chemical potential energy
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In the circular flow diagram, what do firms provide to product markets?(1 point)
Answer:
Firms produce goods and services,which they sell to households in return for revenue.
Answer: Goods and Services
Explanation:
A photon of 498mm was emitted from a silicon atom. calculate the energy of all the atomic levels of silicon and show that the atomic levels are quantized.
A photon is an elementary particle that has zero invariant mass and travels in a vacuum with a constant velocity. It is capable of generating electromagnetic phenomena since it carries all forms of electromagnetic radiation:
X-rays Ultraviolet light Visible light Gamma rays Infrared light Radio waves Microwaves and radio wavesThe photon presents wave and corpuscular properties, this means that it behaves as a wave in certain phenomena, such as refraction in a lens; and as a particle when it interacts with matter to transfer energy. The latter is expressed as follows:
[tex]E=\frac{hc}{lambda} = hv[/tex]
E is the energy, in physics it is defined as the capacity to do work.h is Planck's constant, a physical constant that plays a role in the theory of quantum mechanics and it is a constant between the energy of a photon and the frequency of its electromagnetic wave ([tex]E = hv[/tex]) Its value is 6.63 x 10^-34 J/s.c is the speed of light, which is 3x10^8 m/s.lambda (λ) is the wavelength, the distance traveled by a periodic disturbance propagating in one cycle. v is the frequency of the wave, it is the inverse of the wavelength, the number of repetitions per unit time of any periodic event.This means that each photon has energy that is proportional to the frequency of light. In this case, the energy is quantized, which means that the energy of the photons is restricted to certain values. The energy at subatomic levels occurs in packets that refer to the photon, which are the packages of energy and each one correspond to different types of radiation.
This differs from classical waves, which can gain or lose arbitrary amounts of energy.
If we apply the equation and replace the information, we have:
[tex]E=\frac{6.63 x 10^{-34} J/s x 3 x 10^{8} m/s }{498 nm} = 3.99 x 10^{-28} J[/tex]
So 3.99 x 10^-28 J is the amount of energy of the photon of 498 nm emmited from a silicon atom.
Now we will show that the atomic levels are quantized. An atom has ground state (n=1) energy of 13.6 eV. Higher states means the atom is at an excited state. When this happens, an electron from an atom loses energy and makes a transition to a lower state. To avoid this and conserve energy, the atom emits a photon with an amount of energy that equals the difference of energy between a ground state and another state. So we can calculate the energy of the electron in different states.
[tex]E_{n} = \frac{-13.6 ev}{n^{2} }[/tex]
[tex]E_{1} = \frac{-13.6 ev}{1^{2} }=-13.6 ev[/tex]
[tex]E_{2} = \frac{-13.6 ev}{2^{2} }=-3.4 ev[/tex]
[tex]E_{3} = \frac{-13.6 ev}{3^{2} }=-1.511 ev[/tex]
N represents the principal quantum number, which is the overall energy of each orbital. This energy increases as its distance from the nucleus increases. Here we can se that the value of energy of n=1 is higher than energy of n=2, and this one is higher from the energy of n=3. This means each level has a specific energy and it is quantized according to the value of n.
So, a photon is an elementary particle which carries radiation and presents a wave-corpuscle duality, where particles may exhibit wave-like behavior in some experiments while appearing as particles in others. A photon is emmited when an atom loses energy, to conserve this energy and avoid a transition to a lower state. The electron energy is quantized because it is restricted to characteristic values, only taking non-continuous values. In this question, the amount of energy of the photon emmited is 3.99 x 10^-28 J. And the atomic levels are quantized according to the principal quantum number.
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I have science exam tomorrow plz guys help meh!!!
Differentiate between : Physical change and chemical change
Answer:
chemical change is a where a variation occurs when several reactants are combined or mixed together.
physical change is a process whereby you gain or lose energy as you cool or heat it.
Explanation:
what is single and double displacement reaction?
[tex]{{\boxed{\mathcal{\red{It \: will \: be \: in \: your\: \: text \: book \: see}}}}}[/tex]
Why does America use miles but everyone else kilometers?
Answer:
So why hasn't it changed? The biggest reasons the U.S. hasn't adopted the metric system are simply time and money. When the Industrial Revolution began in the country, expensive manufacturing plants became a main source of American jobs and consumer products.
777 Joules of energy are applied to 25.0 grams of each of the following materials, which
will change temperature the most?
iron, glass, aluminum, copper, gold
Answer:
I think copper
Explanation:
Material IACS % Conductivity
Silver 105
Copper 100
Gold 70
Aluminum 61
Nickel 22
Zinc 27
Brass 28
Iron 17
Tin 15
Phosphor Bronze 15
Lead 7
Nickel Aluminum Bronze 7
Steel 3 to 15
the table might help- your indian brother
Which elements would react most easily with each other? (1 point)
an element with a high electronegativity and an element with a full shell of electrons
an element with a high electronegativity and an element with a single valence electron
an element with a high electronegativity and a second element with a high electronegativity
an element with a high electronegativity and an element with low reactivity
Answer: an element with a high electronegativity and an element with a single valence electron
is the correct answer
_______________________________________________________
Answer:
"Any element with a high electronegativity and an element with a single valence electron would react very easily on contact with each other."_______________________________________________________
"Why?"
For instance, fluorine is the most reactive non-metal element on the periodic table. Due to it's small size, as well as it's strong electronegativity, fluorine has a strong tendency to accept electrons from other atoms and ions. But when Fluorine comes in contact with Hydrogen (a single valence electron element), for instance, it immediately reacts, resulting in an explosion.
_______________________________________________________
Hope this helps!
2.
What is the density of a 625 g cube of metal with a volume of 89 mL?
Answer:
density = 7.02 g/mL
Explanation:
density is mass over volume, just divide
d = 625 g/89 mL = 7.02 g/mL
How many moles of magnesium bromide are formed when 3.0 moles of magnesium reacts with 2.0 moles of bromine?
Mg+Br2 -> MgBr2
Answer:
Explanation:
Hello there, I think this is a limiting agent question.
When 3 moles of Mg is reacted with 2 moles of Br2, because of ratio, we just need 1.5 moles of Br2, so Mg is a limiting agent.
So 3 moles of Mg will make 3 moles of MgBr
Answer:
Use the given functions to set up and simplify
Mg+Br2→MgBr⋅2.
3=
2=
Mg+Br2→gBr⋅2=r2B+gM→MgBr⋅2
Explanation:
SORRY IF I AM WRONG HAVE A BLESS DAY :D
5 Why is it useful to organize the data on a graph? Explain your answer.
Answer:
Hey mate.....
Explanation:
This is ur answer....
Charts, tables, and graphs help communicators organize that data in a way that helps their audiences understand the story the data tells and, hopefully, interpret it correctly.
Hope it helps!
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Can pure water exist as a liquid at 110° C ? Why or why not?
According to forces of attraction and as boiling point is 100°C pure water cannot exist as a liquid at 110° C.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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what is potential energy
Answer:
The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
so simple question.
Answer:
Potential energy is stored energy that an object has because of its position.
Explanation:
Consider an example where a ball is thrown from a tall building. The point at which the ball is at its maximum height is said to have the maximum potential energy. As the ball gradually falls down, the potential energy decreases and turns into another form of energy, kinetic energy (energy in the form of motion). The ball at its peak position had stored energy, however, as soon as it begins moving, the stored energy will become less.
You can think of it this way where the ball has less and less distance to cover when falling downwards from the building. This shorter distance covered by the ball is proportional to the potential energy, so when the ball is about to hit the ground, the potential energy will be close to 0.
I hope this makes more sense!
PLS HELP MATCH CONVERSIONS!!!!!
1 km/1000 m
7.5 m to km
3.875 g to mg
1000 m/1 km
1 g/1000 mg
50 mL to L
7.5 L into mL
1000 mL/1L
750 km to m
1 g/1000 mg
0.3 mg
1 L/1000 mL
Frost disappears from the window in the morning
a
Chemical Change
b
Physical Change
Answer:
the answer is b
Explanation:
Physical changes affect a substance's physical properties but do not alter its chemical structure. Types of physical changes include boiling, clouding, dissolution, freezing, freeze-drying, frost, liquefaction, melting, smoke and vaporization.
Science
0.00098 I need that converted to the scientific notation I need help quick
Answer:
9.8×10^-4...... is the answer
Which of the following describes what a scientist does?
A. A scientist answers ethical questions.
B. A scientist asks questions about the world.
O C. A scientist determines right from wrong.
D. A scientist tells people how they should behave.
Answer:
B
Explanation:
what is the value of gravitation constant on the surface of the moon
Answer:
The value of gravitational constant on the surface of the moon is 1.625 m/s<sup>2</sup>
Sugar Dissolving
a
Chemical Change
b
Physical Change
Chemical change cuz you are adding another substance to your water which changes the molecular structure of the water.
which of the folowing idead about thr atom changed when new evidence was discoverd
Answer:
Further scientific studies showed that an atom can further be divided into subatomic particles electrons, neutrons, and protons. Thus the idea of the indivisibility of an atom changed when new evidence was discovered.
The bond formed between two nonmetal atoms is called a(n) bond. This type of bond arises from the net attraction between the of each atom and the electrons of the other, and results in electrons being between the two atoms. Listen to the complete question
Answer: Covalent
Explanation: By definition, covalent bonds are those in which the shared electrons are shared greater than 50% of the time between two atoms.
What does it mean to be in the path of totality?(1 point)
You are on part of Earth that can see a total lunar eclipse.
You are on part of Earth that can see a partial lunar eclipse.
You are on part of Earth that is in the umbra of the moon’s shadow.
You are on part of Earth that is in the penumbra of the moon’s shadow.
To be in the path of totality means that
You are on part of Earth that is in the umbra of the moon’s shadow.The path of totality is the track the Moon's umbral shadow leaves across the surface of the Earth. Its width measures up to 200 miles and its length measures up to 10,000 miles.
When the moon covers the earth's surface, a total solar eclipse has occurred.
An individual who is on the path of totality can observe the occurrence of a total solar eclipse within a short while.
Summarily, a person who is on the path of totality can see a total lunar eclipse.
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pls
answer
pls
pls
its ma homework
Answer:
2 ka A. nitrogen, oxygen, Carbon dioxide
Answer:
no 1 Ans gas
hope it works
What is the function of phloem tissue in the plant transport system?
A.it prepares food
B.it transports food
C.it transports water
D.it provides support
Answer:
option B is the right answer it helps in transfer of food.