Answer:
Expl
Electron: A negatively charged particle found circling or orbiting an atomic nucleus. An electron, like a proton is a charged particle, although opposite in sign, but unlike a proton, an electron has negligible atomic mass. Electrons contribute no atomic mass units to the total atomic weight of an atom.\anation:
three moles of sodium carbonate are mixed with two moles of lead nitrate in aqueous solution, leading to formation of a solid precipitate. how many moles of spectator ions remain in solution, assuming 100% yield of the precipitate?
There are 4 moles of spectator ions that remain in solution.
The equation of the reaction is;
Na2CO3(aq) + Pb(NO3)2(aq) -------> PbCO3(s) + 2NaNO3(aq)
We have to determine the limiting reactant. This is the reactant that yields the least amount of product. Note that the spectator ions are Na^+ and NO3^- that form NaNO3.
For Na2CO3
1 mole of Na2CO3 yields 2 moles of NaNO3
3 moles of Na2CO3 yields 3 × 2/1 = 6 moles of NaNO3
For Pb(NO3)2
1 mole of Pb(NO3)2 yields 2 moles of NaNO3
2 moles of Pb(NO3)2 yields 2 × 2/1 = 4 moles of NaNO3
We can see that Pb(NO3)2 is the limiting reactant.
Since [NaNO3] = [Na^+] = [NO3^-], it follows that there are 4 moles of spectator ions that remain in solution.
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Which is the best definition of air pressure?
A.the amount of water vapor in the air.
B.the weight of the air pressing on everything in the environment
C.the amount of precipitation in a certain area
D.the type of clouds in the atmosphere
Based on location in the periodic table, which element has chemical properties that are most similar to iodine
xenon (Xe)
calcium (Ca)
Selenium (Se)
fluorine (F)
Answer:fluorine
Explanation:
Based on location in the periodic table, fluorine (F) has chemical properties that are most similar to iodine.
In the periodic table, elements are classified in groups and periods. The elements in the same group are chemically similar and they have the same number of valence electrons. Elements in the same period have the same highest energy level.
Hence, when looking for an element that is most chemically similar to iodine, we have to consider the element that is in the same group with iodine.
Both fluorine are iodine are both in group 17 hence, fluorine is most chemically similar to iodine.
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The atomic number of oxygen is 8. The mass number of an atom of oxygen is 17. Describe the number and type of particles in the nucleus of this atom.
Answer:
protons: 8
neutrons: 9
Explanation:
the atomic number tells you how many protons are in a element. The mass is the number of protons + neutrons.
17 - 8 = 9 neutrons
There are 8 protons and 9 neutrons in the nucleus of the oxygen atom.
What is the atomic number and mass number of an atom?The atomic number of an atom is the number of protons in atom of an element.
It can also be defined as the number of electrons in a neutral atom of an element.
The mass number is the number of protons and neutrons in the nucleus of an atom of an element.
The proton number of the oxygen atom is 8
The neutron number is 17 - 8 = 9
Therefore, in the nucleus of the oxygen atom, there are 8 protons and 9 neutrons.
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the elements in the far upper right corner are classified as
5.
The weight of an object is the force of attraction between the object
and the Earth
TRUE
FALSE
Answer: True
Explanation:
If you’ve seen a baseball game, you’ve probably also experienced the sight of a ball going up and up, until you begin to wonder when it’s going to come down! Yet every time, the ball does fall back to earth. Why? Gravity is an attractive force that exerts a pull between two objects, such as a baseball and the earth.
how many moles of HNO3 would be formed from 1.0 mole of NO2
How do you know where something fits on the electromagnetic spectrum? I currently have the Hz but do I need to convert that into something else?
an immiscible mixture that is not composed oil and water
Answer:
"like-dissolves-like"
Any polarized molecule will not be soluble in a mixture of non-polarized molecules. Also, Acids and Bases mix with one another but not into neutral compounds. Organic molecules also do not mix with non-organic or aqueous solutions (like those without neutral pH)
Explanation:
how many valence electrons does alkali metals gain or lose
Answer:
Alkali metals have 1 valence electron on their outer shell. They are more stable when they have 8 valence electrons, so they want to lose that valence electron. They do this by bonding with other elements. When they lose their 1 valence electron, they have a full octet and are therefore stable.:
Which of these element is NOT an alkali metal? Na Rb H cs
Answer: Hydrogen-H
Explanation: Hydrogen is a gas, the most abundant element in the universe and the simplest of them all
Dissolving and melting are similar because both
A. result in a change in mass.
B. are kinds of physical change.
C. involve even mixing of substances.
D. result in new substances being formed.
Answer is B are kinds of physical change.
decide how to supersets these substances? If if is not possible, please write "cannot be separated" on the space provided
Answer: (although the question does not sate whether if you separate them physically or through energy. so i did both)
1. can be separated (When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen)
2. can be separated, but through electrolysis, fiscally moving a crane to generate electricity to separate the molecules
3. Most solid particles, composed of diamagnetic or weak paramagnetic materials, cannot be extracted by a conventional magnetic separator. physically cannot be separated. but through heat yes
4. but there is a catch: doing so requires energy. ... If energy from coal were applied to drive the decomposition reaction, more CO2 would be released than consumed, because no process is perfectly efficient. so it cant be separated physically
5. it can be separated but it needs energy physically cannot be separated.
Explanation:
What is the correct name for Fe203?
A Iron(V) oxide
B Iron(III) oxide
C Iron(I) oxide
D Iron(II) oxide
Answer:
The answer would be B.
Explanation:
help me with this:((
1. a
2. a
3. b
4. b
5. c
6. a
7. c
water resists changing its temperature because it has a high specific heat. true or false?
Answer:
true
Explanation:
Knowing an object's position requires which of the following? A. speed B. time C. displacement D. reference point
Knowing an object's position requires the (D) reference point
Reference point is the starting point use to locate another place or object. an object's position depends on reference point.
Position describes the distance and direction from reference point for an object. position of an object's is the location to the reference point.
Displacement is the difference between the initial position and the final position.
Speed is defined as the distance an object travels per unit time.
Time is defined as the duration of an object travels to cover a distance.
so according to all , reference point is needed to determine the position of an object's.
Thus, Knowing an object's position requires the (D) reference point
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What is sliver?
[tex]silver[/tex]
Chemical element
Silver is a chemical element with the symbol Ag (from the Latin argentum, derived from the Proto-Indo-European h₂erǵ: "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
Answer:
silver
Explanation:
is a chemical element with the symbol Ag (from the Latin argentum, derived from the Proto-Indo-European h₂erǵ: "shiny" or "white") and atomic number 47.
pls help i need the Formula
how can you calculate the number of electrons present in a shell? pls help!!! will give brainliest
Answer:
The maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2).
coal mining environmental impact
Explain what impact coal mining has and what it affects
CAN SOMEONE PLS HELP THANK U
Answer:
There are significant environmental impacts associated with coal mining and use. It could require the removal of massive amounts of top soil, leading to erosion, loss of habitat and pollution. Coal mining causes acid mine drainage, which causes heavy metals to dissolve and seep into ground and surface water.
Explanation:
1. Calculate the energy in joules of a photon of electromagnetic radiation whose frequency is 2.76×1014 s−1 .
Express your answer with the appropriate units.
2. Calculate the energy in joules of a photon of radiation whose wavelength is 418 nm
Express your answer with the appropriate units.
3. What wavelength (in meters) of radiation has photons of energy 6.05×10−19 J ?
Express your answer with the appropriate units.
Answer: 41.5
Explanation:
what happens when a liquid becomes a gas
Answer:
When a liquid changes to gas, the particles absorb heat energy and they start vibrating faster and distance between them increases. On constant vibration, intermolecular forces decrease and particles start moving away from each other and change to gas.
distillation could not be used to separate one of the following:
a. rubbing alcohol and water
b. motor oil and brake fluid
c. sand and gold
d. gasoline fractions
i’m not sure but i think it is c
Answer:
It's motor oil and brake fluid
which scientist developed the nuclear model of the atom?
Answer:
Earnest Rutherford
Explanation:
From what I beleive, Rutherford had created the nuclear model
Pots and pans that are used for cooking are often
made of copper, aluminum, and iron. Explain how metallic bonding makes these
metals suitable for this use.
Cooking materials are made of copper, aluminum, and iron because they contain free, mobile electrons owing to the metallic bond.
Metallic bonding involves a sea of electrons that is bonded to metal cations by electrostatic attraction. The electrons in the metallic bond are free to move around the material.
Because there are free electrons, when the material is heated, the electrons receive energy and move faster, this energy spreads throughout the material by conduction.
Hence, good conductors of heat such as copper, aluminum, and iron are used for cooking materials.
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Why is newton's first law of motion considered a law and not a theory?It is an unsupported idea.It is based on multiple observations.It has never been tested.It was validated by a singular experiment.
Answer: B. It is based on multiple observations.
Explanation:
Newton's first law of motion is considered a law and not a theory because it is based on multiple observations.
What is an observation?
Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.
It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.
It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.
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___+___=__KOH+H2 It Is chemistry question
Answer:
It's from the quation:
[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]
(How did I know?)
I learnt it while studying the elements of group 1.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Group 1 elements:K, here, is Potassium. It's position in the periodic table is Group 1, Period 4.
Group 1 elements are also called Alkali metals. Group 1 elements have 1 electron in their valence shell(outermost shell), the electron that takes part in chemical reactions.Valance electrons of elements of this group contribute to the valency of the group's elements I.e.,
valency of Alkali metals is 1!
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Reaction with water:Alkali metals react vigorously with cold water to form their hydroxides alongwith the evolution of Hydrogen gas.What are hydroxides?
Hydroxides of an element comprises one atom each of oxygen and Hydrogen bonded together, acting as an anion, the hydorxide anion — OH-.
Example:
KOH (hydroxide of Potassium) NaOH (Hydroxide of Sodium)- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Back to the question:In the question, The reactants are missing but the products are known, that are, Potassium Hydroxide and water.
Keeping the above mentioned property in mind, the reactants come clear as Potassium(K) and Cold water(H2O).
that makes the equation:
[tex] \mathsf{K + H_2O \rightarrow \: KOH + H_2 }[/tex]
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Balancing the equation:For an equation to be balanced, the number of atoms of each elements on both side of the equation must be equal.
Number of atoms of each element on the LHS:
K = 1 H = 2O = 1(subscript in front of an atom represents its number of atoms in the compund)
Number of atoms of each element on the LHS:
K = 1 H = 1 + 2 = 3O = 1The number of Hydrogen atoms on boths sides is NOT balanced!
Hit and trial method:
If we add a "2" in front of K, H2O and KOH
[tex] \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }[/tex]
Number of atoms on both the sides become equal.
(TIP: This comes thru practice:/. but main point is even out the oxygen and Hydrogen atoms first. like if it's 3 multiply it by 2 and you get an even number, I.e., 6)
Number of atoms of each element on the LHS:
K = 2H = 4O = 2Number of atoms of each element on the LHS:
K = 2H = 2 + 2 = 4 O = 2- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Answer:Hence, the balanced form of the equation is:
[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]
what are the units for the rate constant of a first-order reaction?
Explanation:
the units for the rate constant of a first-order reaction is :
[tex] = {s}^{ - 1} [/tex]
Find the mass of iron that has volume of 111 ml.
Answer:8
842.46 or to the next whole number
Explanation:
just multiply the mass of iron with the volume mL you have.
The mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.
Which term is equivalent to product of density and volume?
The product of density and volume of a substance represents its mass. Mathematically -
M = V x ρ
where -
ρ - density
M - mass
V - volume
Given is iron in liquid form. It occupies a total volume of 111 ml.
The mass of liquid iron can be calculated using -
M = V x ρ
Volume of iron [V] = 111 ml = 111 cm³.
Density of iron [ρ] = 7.847 g/cm³
Therefore, we can write -
M = 7.847 x 111
M = 871.01 grams
Therefore, the mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.
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Using the synopsis of the article, which of the following is a true statement?
Question 1 options:
Scientists determined the Earth has a metallic liquid core and confirmed their theory.
Scientists work independently to form theories about the Earth without sharing data.
Scientists have updated their original models of the Earth’s interior to reflect new discoveries.
Scientists developed an evidence-based model showing the Earth has a solid outer and inner core.
Answer: Scientists work independently to form theories about the Earth without sharing d
Scientists work independently to form theories about the Earth without sharing data.
What is solar system?Solar system is defined as the grouping of the eight planets and their moons in orbit around the sun, as well as other smaller bodies like comets, asteroids, and meteoroids.
It can also be defined as the Sun's orbiting objects are confined by gravity to one system.
An orbiting collection of planets, meteors, or other celestial bodies is referred to as a star system.
The Sun, an ordinary star, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto make up our solar system.
Our solar system is referred to as the "solar system" because our Sun is called Sol after the Latin word for Sun, "solis," and because anything related to the Sun is termed "solar."
Thus, scientists work independently to form theories about the Earth without sharing data.
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