Answer:
Explanation:
The electron is jumped into higher level and back into lower level by absorbing and releasing the energy.
The process is called excitation and de-excitation.
Excitation:
When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits. For example if electron jumped from K to L it must absorbed the energy which is equal the energy difference of these two level. The excited electron thus move back to lower energy level which is K by releasing the energy because electron can not stay longer in higher energy level and comes to ground state.
Consider the hydrogen atom. When it is n=1 energy level its energy must be -13.6 eV. While the energy of second energy level is -3.4 eV. Thus in order to jump from n=1 to n=2 its must absorbed (-3.4) - (-13.6) = 10.2 eV energy.
This is the excited state of hydrogen atom. It can not stay for long time in this state. It loses same amount of energy and came back to the ground state. Thus process is called de-excitation.
Answer:
It increases then decreases
Calculate the average time it took the car to travel 0.25 What is the average time it took the car to travel 0.25
and 0.50 meters with four washers attached to the pulley. meters?
Record the averages, rounded to two decimal places, in
Table C of your Student Guide.
seconds
What is the average time it took the car to travel 0.50
meters?
seconds
To find the average time for multiple trials of a car traveling a distance, sum the times and divide by the number of trials, then record these averages to two decimal places.
Explanation:Calculating Average Time and Speed
To calculate the average time it takes a car to travel certain distances with washers attached to a pulley, you need to record the time it takes to travel those distances multiple times. Then, sum these times and divide by the number of trials to find the average. For example, if you measure the time it takes a car to travel 0.25 meters four times and get times of t1, t2, t3, and t4 seconds, the average time would be calculated as (t1 + t2 + t3 + t4) / 4. The process is similar for calculating the average time for 0.50 meters. Once you have these averages, you can record and round them to two decimal places for inclusion in Table C of the Student Guide.
The procedure also involves plotting a 'Distance vs. Time' graph from the recorded data and finding the gradient for the straight line through the data points, which yields the average velocity of the car.
Nitrogen (N) needs three more electrons to fill its outermost energy level. What is the number of electrons that Nitrogen (N) has in its outermost energy level before it forms a bond?
Answer: 5
Explanation: nitrogen has atomic number of 7 and its electronic configuration is 2, 5.
5 is the number of electrons in the outermost shell
Using the drop-down menus, label the parts of the rock
cycle.
A~
B~
C~
D~
Answer:
A is Sediments
B is metamorphic rock
C is sedimentary rocks
D is weathering
Explanation:
A represent smaller particles of rocks known as sediments. From the picture above sedimentary rocks, igneous rocks and metamorphic rocks were broken into smaller constituent due to events like weathering(D). Weathering disintegrated these rocks into smaller particles (sediments).
B is rock known as metamorphic rocks. Metamorphic rocks are formed from igneous, sedimentary or even metamorphic rocks. The major factor behind metamorphic rocks formation is temperature and pressure. Generally, the parents rocks never melts, the transformation usually occur in a solid state. Metamorphism is a process that is usually accompanied with change in mineral assemblage , physical attribute of the rocks or both. From the picture above the sedimentary rocks(C) was converted to metamorphic rocks due to temperature and pressure . Same occurrence was present in the conversion of igneous rocks to metamorphic rocks(B)
C is a sedimentary rocks. Sedimentary rocks are formed from smaller particles of the weathered rocks. The smaller particles are known as sediments. This sediments are then cemented and compacted by cementing agents to form sedimentary rocks.
D is a process, which is known as weathering. Weathering is the disintegration of rocks into smaller particles to form sediments . Weathering may involve change in the chemical composition of rocks or just a physical change . From the picture above igneous rocks, metamorphic rock and sedimentary rocks were weathered to form sediments(A).
Answer:
Explanation: i got 100% on edge.
Complete the following radioactive decay problem.
222 86 RN to 4 2 HE + ?
Answer:
₈₆²²²Rn → ₈₄Po²¹⁸ + H₂⁴
Explanation:
The given nuclear reaction shows alpha decay.
₈₆²²²Rn → ₈₄Po²¹⁸ + H₂⁴
Properties of alpha radiations:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
Final answer:
The radioactive decay of radon-222 emits an alpha particle, resulting in the formation of polonium-218. This process can be represented by the nuclear equation 222Rn → 4He + 218Po.
Explanation:
The question refers to the radioactive decay of radon-222. In this decay process, radon-222 emits an alpha particle (42He) and transforms into a different element. An alpha particle consists of 2 protons and 2 neutrons, which is why it's represented as 42He. The nuclear equation for this decay can be written as follows:
22286Rn → 42He + 21884Po
To balance the equation, you subtract the mass number and the atomic number of the alpha particle from those of the original radon-222 nucleus. This leaves us with an element that has an atomic number of 84 and a mass number of 218, which is polonium (Po). Therefore, the complete nuclear equation is:
222Rn → 4He + 218Po
Which of the following illustrates the conservation of matter?
A. 4 Al + 3 O2 —> 2 Al2O3
B. 2 C2H6 + 6 O2 —> 4 CO2 + 7 H2O
C. 4 CO2 + H2 —> 2 CH4 + H2O
D. Mg + O2 —> MgO
Answer:
A. 4 Al + 3 O2 —> 2 Al2O3
Explanation:
4Al + 3O2 —> 2Al2O3
There are four aluminium and six oxygen atoms on both side of equation so this equation follow the law of conservation of matter.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
Final answer:
Option A correctly illustrates the conservation of matter as the chemical equation is balanced with 4 aluminum atoms and 6 oxygen atoms on each side, adhering to the principle that matter is neither created nor destroyed in a chemical reaction.
Explanation:
The conservation of matter is a principle in chemistry that states matter is neither created nor destroyed in a chemical reaction. To illustrate this, we examine the chemical equations provided to see if they are balanced—that is, if they have the same number of each type of atom on both sides of the equation.
A. 4 Al + 3 O2 —> 2 Al2O3: This is a balanced equation showing 4 aluminum (Al) atoms and 6 oxygen (O) atoms on both sides, following the conservation of matter.B. 2 C2H6 + 6 O2 —> 4 CO2 + 7 H2O: This equation is not balanced and does not follow conservation of matter as written. There are more oxygen atoms on the product side than on the reactant side.C. 4 CO2 + H2 —> 2 CH4 + H2O: This equation does not conserve matter because there are unequal numbers of carbon, hydrogen, and oxygen atoms on each side of the equation.D. Mg + O2 —> MgO: This equation is not balanced as written and does not illustrate the conservation of matter, but it could if balanced properly (2 Mg + O2 —> 2 MgO).Therefore, option A – 4 Al + 3 O2 —> 2 Al2O3 – correctly illustrates the principle of conservation of matter because the reaction is balanced with equal numbers of atoms on both sides of the equation.
NEED HELP QUICKLY!!!!! Calculate the volume of each of the following gases at STP. Show your work.
A. 7.6 mol Ar
B. 0.44 mol C2H6
C. 3.6 mol NH3
Answer:
A. 170.24 dm³
B. 9.9 dm³
C. 80.6 dm³
Explanation:
Data Given:
no. of moles of Ar = 7.6 mol
no. of moles of C₂H₆ = 0.44 mol
no. of moles of NH₃ = 3.6 mol
Volume of each gas at STP = ?
Solution:
To calculate volume of gas at STP (Standard temperature and pressure) formula will be used
no. of moles = volume of gas / molar Volume
Rearrange the above equation:
Volume of gas = no. of moles x molar Volume . . . . . . (1)
where
molar volume at STP = 22.4 dm³/mol
• A. Now to calculate Volume for 7.6 mole Ar
Put value in equation 1
Volume of Ar = 7.6 mol x 22.4 dm³/mol
Volume of Ar = 170.24 dm³
___________
• B. Now to calculate Volume for 0.44 mole C₂H₆
Put value in equation 1
Volume of C₂H₆ = 0.44 mol x 22.4 dm³/mol
Volume of C₂H₆ = 9.9 dm³
___________
• C. Now to calculate Volume for 3.6 mole NH₃
Put value in equation 1
Volume of NH₃ = 3.6 mol x 22.4 dm³/mol
Volume of NH₃ = 80.6 dm³
The volume of the gases at Standard Temperature and Pressure (STP) can be calculated using Avogadro's law. For 7.6 mol of Ar, the volume is 170.24 L. For 0.44 mol of C2H6, the volume is 9.856 L and for 3.6 mol of NH3, the volume is 80.64 L.
Explanation:To calculate the volume of a gas at Standard Temperature and Pressure (STP), you can use Avogadro's law which states that one mole of any gas will occupy a volume of 22.4 liters.
The calculated volumes of the gases are:
A. 7.6 mol Ar: Volume = (number of moles * volume of 1 mole at STP) = 7.6 * 22.4 L = 170.24 L B. 0.44 mol C2H6: Volume = 0.44 * 22.4 L = 9.856 L C. 3.6 mol NH3: Volume = 3.6 * 22.4 L = 80.64 L Learn more about Gas Volume Calculation here:
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The carbon dioxide exhaled by astronauts can be removed by its reaction with lithium hydroxide, LiOH, according to the following chemical equation: CO2(g) + 2LIOH(s) — LI2CO3(s)
+ H2O4). How many moles of lithium carbonate are produced when 20.0 mol CO2 the average
amount exhaled by a person each day, reacts completely with lithium hydroxide?
Answer:
20.0 mol
Explanation:
The balanced chemical equation is already given for this process. According to the corrected balanced chemical equation, carbon dioxide reacts with 2 moles of lithium hydroxide to produce 1 mole of lithium carbonate and 1 mole of water:
[tex]2 LiOH(aq)+CO2 (g)\rightarrow Li_2CO_3 (aq)+H_2O (l)[/tex]
Notice that the problem states that 20.0 mol of carbon dioxide react completely. This implies that carbon dioxide is the limiting reactant. According to the balanced chemical equation, 1 mole of carbon dioxide produces 1 mole of lithium carbonate (pay close attention to the coefficients in the balanced chemical equation).
This means if we have 20.0 mol of carbon dioxide, we can produce a maximum of 20.0 mol of lithium carbonate.
Final answer:
Twenty moles of CO₂ react with lithium hydroxide to produce twenty moles of lithium carbonate, provided there is excess LiOH.
Explanation:
Reaction of CO₂ with LiOH
When carbon dioxide (CO₂) reacts with lithium hydroxide (LiOH), lithium carbonate (Li₂CO₃) is produced along with water (H₂O). According to the balanced chemical equation CO₂(g) + 2LiOH(s) → Li₂CO₃(s) + H₂O(l), one mole of carbon dioxide reacts with two moles of lithium hydroxide to produce one mole of lithium carbonate. Therefore, for the complete reaction of 20.0 moles of CO₂, a total of 20.0 moles of lithium carbonate would be formed, assuming that there is excess LiOH present.
emission results in the release of energy without any apparent change in mass or nuclear charge.
alpha particle
beta particle
gamma ray
omega particle
Answer:
gamma ray
Explanation:
Gamma emission results in the release of energy without any apparent change in mass or nuclear charge.
Properties of Gamma radiations:
Gamma radiations are high energy radiations having no mass.
These radiations are travel at the speed of light.
Gamma radiations can penetrate into the many materials.
These radiations are also used to treat the cancer.
Lead is used for the protection against gamma radiations because of its high molecular density.
The lead apron are used by the person when treated with gamma radiations.
Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.
Answer:
gamma ray
Explanation:
For the reaction 6CO2(g) + 6H2O(l) > C6H12O6(s) + 6O2(g), what mass, in grams, of glucose is produced from 3.00 moles of carbon dioxide?
Final answer:
To calculate the mass of glucose produced from 3.00 moles of carbon dioxide in the photosynthesis reaction, use the mole ratio from the balanced equation and the molar mass of glucose (180.16 g/mol), which results in 90.08 grams of glucose.
Explanation:
The reaction 6CO₂(g) + 6H₂O(l) → C₆H1₁₂O₆(s) + 6O₂(g) represents the photosynthesis process where carbon dioxide and water produce glucose and oxygen. To find out the mass of glucose produced from 3.00 moles of carbon dioxide, we can use the mole ratio from the balanced chemical equation and the molar mass of glucose.
The balanced equation tells us that 6 moles of CO₂ produce 1 mole of glucose (C₆H₁₂O₆). Therefore, 3.00 moles of CO2 will produce half as much glucose, which is 0.5 moles of glucose. By using the molar mass of glucose, we can convert moles to grams.
For glucose, the molar mass is 180.16 g/mol. So,
Calculate the amount of glucose in moles: (⅓) * (1 mole of C₆H₁₂O₆) = 0.5 moles of C6H12O6.Convert moles of glucose to grams: 0.5 moles * 180.16 g/mol = 90.08 grams of glucose.caculate the mass of a solid with a density of 14.2 g/cm cubed and a volume of 350 cm cubed
Answer:
The mass of solid with density 14.2 g/cm3 and volume 350 cm3 is 4.97 Kg.
Explanation:
Formula for density is given below :
[tex]density = \frac{mass}{volume}[/tex]
[tex]volume = 350 cm^{3}[/tex]
[tex]density = 14.2 g/cm^{3}[/tex]
Insert the values in the formula
[tex]14.2 = \frac{mass}{350}[/tex]
on cross multiplication :
[tex]mass = density\times volume[/tex]
[tex]mass = 14.2\times 350[/tex]
[tex]mass = 4970 g[/tex]
1 g = 0.001 Kg
[tex]mass =4970\times 0.001 Kg[/tex]
mass = 4.97 Kg
Note : Check the units of volume and density carefully
Which term describes this reaction?
Answer:
dehydration process is occurring in this process.
Concentrated sulfuric acid sometimes used as drying agent because it has a very strong affinity for water and can be used to dehydrate means removal of water occur. Removing of water from reactant compound results in formation of double bond in product compound.
The given reaction involves the dehydration of ethanol ([tex]CH_3CH_2OH[/tex]) in the presence of sulfuric acid ([tex]H_2SO_4[/tex]) and heat, resulting in the formation of ethylene ([tex]CH_2CH_2[/tex]). This type of reaction is known as an elimination reaction. Specifically, it is a dehydration reaction, where water ([tex]H_2O[/tex]) is removed from the starting material to form the product.
The reaction described involves the dehydration of ethanol ([tex]CH_3CH_2OH[/tex]) in the presence of sulfuric acid ([tex]H_2SO_4[/tex]) and heat, resulting in the formation of ethylene ([tex]CH_2CH_2[/tex]).
Dehydration reactions are a type of elimination reaction where a molecule of water is removed from the starting material to form a new compound.
In this case, the hydrogen and hydroxyl (OH) groups from adjacent carbon atoms in ethanol are eliminated to form a double bond between the carbon atoms, resulting in the formation of ethylene.
Sulfuric acid acts as a catalyst, facilitating the removal of the water molecule from the ethanol molecule. The heat provides the energy required to drive the reaction forward.
Overall, this reaction is an example of a chemical transformation that involves the removal of water to form a new compound.
0.16
X,0
520
6.9
XCI
0.53
0.98
453.7
ΧΗ
What element is this?
Answer:
148x +7856y
Explanation:
The element XCI represented in Roman numerals corresponds to the atomic number of Protactinium. However, ΧΗ does not correspond to any known element in the periodic table.
Explanation:The elements you've mentioned, X and ΧΗ, do not correspond to any known chemical elements in the periodic table. Chemical elements are typically represented by their chemical symbols, which are one or two letters derived from their English or Latin names. For example, "H" represents hydrogen, "O" represents oxygen, "C" represents carbon, and "Fe" represents iron.
It's possible that the symbols "X" and "ΧΗ" do not correspond to any naturally occurring elements or may not be recognized in the context of the periodic table. If you have more information or context regarding these symbols, please provide it, and I will do my best to assist you further.
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PLEASE HELP ASAP !!
Answer:
2SO₂ + O₂ + 2H₂O -----------> 2H₂SO₄Theoretical yield of H₂SO₄ = 213 gpercent yield of H₂SO₄ = 94 %Explanation:
Data Given:
volume of SO₂ = 48.6 L
mass of H₂SO₄ = 200 g
balance equation = ?
theoretical yield = ?
percent yield = ?
Solution:
Part 1:
first we have to write a balance equation for the reaction
SO₂ gas react with water (H₂O) and excess oxygen
The balanced equation is as under
2SO₂ + O₂ + 2H₂O -----------> 2H₂SO₄
Part 2:
Now we have to find theoretical yield
First look at the balance reaction
2SO₂ + O₂ + 2H₂O -----------> 2H₂SO₄
2 mol 2 mol
2 moles of SO₂ give gives 2 moles of H₂SO₄
Now calculate volume of 2 moles of SO₂ and mass of 2 moles of H₂SO₄
volume of 2 moles of SO₂
Formula used
volume of gas = no. of moles x molar volume . . . . . . (1)
molar volume of SO₂= 22.4 L/mol
Put values in above formula (1)
volume of gas = 2 mol x 22.4 L/mol
volume of gas = 44.8 L
volume of 2 mole of SO₂ = 44.8 L
Now,
Find mass of 2 mole H₂SO₄
Formula Used
mass in grams = no. of moles x molar mass . . . . . . . (2)
molar mass of H₂SO₄ = 2 (1) + 32 + 4(16)
molar mass of H₂SO₄ = 98 g/mol
put values in equation 2
mass in grams = 2 mol x 98 g/mol
mass in grams = 196 g
mass of 2 mole of H₂SO₄ = 196 g
** So,
Now we come to know that
44.8 L of SO₂ gives 196 g of H₂SO₄ then how many grams of the H₂SO₄ will be produced by 48.6 L of SO₂
Apply unity Formula
44.8 L of SO₂ ≅ 196 g of H₂SO₄
48.6 L of SO₂ ≅ X g of H₂SO₄
Do cross multiplication
g of H₂SO₄ = 196 g x 48.6 L / 44.8 L
g of H₂SO₄ = 213 g
So that is why the theoretical yield of H₂SO₄ is 213 g
Theoretical yield of H₂SO₄ = 213 g
Part 3
Calculate Percent Yield:
Formula used for this purpose:
percent yield = actual yield /theoretical yield x 100 %
Put value in the above formula
percent yield = 200 g/ 213 g x 100 %
percent yield = 94 %
So percent yield of H₂SO₄ = 94 %
how are complete ionic and net ionic equations written for chemical reactions in aqueous solutions
Answer:
Explanation:
Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
Chemical equation:
NaCl(aq) + KBr(aq) → NaBr(aq) + KCl(aq)
Ionic equation:
Na⁺(aq) + Cl⁻(aq) + K⁺(aq) + Br⁻(aq) → Na⁺(aq) + Br⁻(aq) + K⁺(aq) + Cl⁻(aq)
Net ionic equation can not be written for this reaction because nothing is changed on both side. There is no solid, liquid and gaseous product. All are aqueous and cancel each other.
418 N force to move a 56 kg mass, at what rate does the object accelerate?
Answer:
7.5 m/s²
Explanation:
Given data:
Force on object = 418 N
Mass of object = 56 kg
Acceleration rate = ?
Solution:
Definition:
The acceleration is rate of change of velocity of an object with respect to time.
Formula:
a = Δv/Δt
a = acceleration
Δv = change in velocity
Δt = change in time
Units:
The unit of acceleration is m.s⁻².
Acceleration can also be determine through following formula,
F = m × a
a = F/m
Now we will put the values.
a = 418 N/ 56 kg
N = Kg. m /s²
a = 418 Kg. m /s²/ 56 kg
a = 7.5 m/s²
Select all that apply.
All the elements of the halogen family are very reactive because they
readily lose one valence electron
I require only one electron to complete their outer shell
have a high electronegativity
form unstable gas molecules
Answer:
They require only one electron to complete their outer shell
Explanation:
The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their high reactivity is due to the presence of seven valance electrons. They need just one electron to complete the octet that's why they can not found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.
Consider the example of sodium chloride. Chlorine accept one electron from sodium and complete the octet.
The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between them and both get complete complete octet.
Answer:
1) have a high electronegativity
and
2) require only one electron to complete their outer shell
Explanation:
Jill then wrote the formulas for all the possible compounds that sodium can form with the other ions. What formulas did she write?
Sodium forms a variety of compounds with different anions, including Sodium Chloride (NaCl), Sodium Oxalate (Na₂C₂O4), Sodium Sulfate (Na2SO4), and Sodium Phosphate (Na3PO4) among others, always ensuring charge neutrality.
Explanation:Sodium, being in the first group of the periodic table, forms a +1 cation. It can combine with other ions to form a variety of compounds, remaining electrically neutral in all cases. For instance, with the chloride ion (Cl-) which is a monatomic anion, sodium forms Sodium Chloride, NaCl. Another combination is with the polyatomic ion Oxalate (C2O4²-), forming Sodium Oxalate or Na₂C₂O4, taking into account that the ratio of Na+ to C2O4²- is 2:1 to ensure neutrality. It's important to mention that while the empirical formula (NaCO2) simplifies this ratio, the accepted formula for sodium oxalate is Na₂C₂O4 which accurately represents the compound's polyatomic anion.
Sodium can also form compounds with other polyatomic ions, such as sulfate (SO4²-), forming Sodium Sulfate, or Na2SO4. Another example is sodium phosphate (Na3PO4), where three sodium ions combine with one phosphate ion (PO4³-) to maintain charge neutrality.
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How much energy does a 9 x 10-8 m wavelength photon have?
A. 5.96 x 10-41 j
B. 2.21 x 10-18 j
C. 7.36 x 10-27
D. 1.988 x 10-49 J
Answer:
B
Explanation:
From the given formukar for energy of a photon, we can obtain the energy of the photon as shown in the image. The meaning of the parameters in the equation are also shown in the image.
Answer: 2.21 x 10^-18 j
Explanation: a pex
convert 5ft to meters PLEASE HELP
Answer:
1.524 is 5ft to meters
Explanation:
an ion of which element is lager then its atom
A- Al
B- Br
C- Ca
D- Sr
When atoms gain electrons they have more electrons, so they increase their size due to the energy levels, orbitals, etc. Those are the atoms that form negative ions. (Non Metals)
When atoms loose electrons and form positive ions they loose components and energy levels. Therefore they decrease their size.
The only one here who forms negative ions is Bromine (Br) that forms Bromide (Br-1)
So it will be answer B) Br
Write a balanced chemical equation for the reaction between ammonium
phosphate solution and a solution of aluminum nitrite if one of the products,
ammonium nitrite, is insoluble in water. Be sure to include phase symbols.
Answer:
(NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→ AlPO₄(l) + 3NH₄NO₃(l)
Explanation:
Data Give:
Reaction between ammonium phosphate solution and solution of aluminum nitrate
Write a balanced chemical equationinclude phase symbolsDetails:
To write a balanced chemical equation we have to know formula units of compounds or molecules
Formula units
ammonium phosphate : (NH₄)₃PO₄
aluminum nitrate: Al(NO₃)₃
ammonium nitrate: NH₄NO₃
Now to write a chemical equation
we have to write the chemical formulas or formula unit of each compoundwrite the reactant on left side of the arrowwrite the product on the right side of the arrowput a plus sign in 2 reactants and products on each side of the arrowbalance the equation by putting coefficient with compound formulawrite the phase symbols on the right corner of the compound formula in bracketsSo the Reaction will be
(NH₄)₃PO₄ + Al(NO₃)₃ -----------→ AlPO₄ + NH₄NO₃
Now balance the Chemical equation
(NH₄)₃PO₄ + Al(NO₃)₃ -----------→ AlPO₄ + 3NH₄NO₃
Now write the phase Symbols
(NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→ AlPO₄(l) + 3NH₄NO₃(l)
all compounds in the reaction are in liquid form and soluble in water
*** Note:
There is no aluminum nitrite in chemicals formulas
Also ammonium nitrite can not be used in pure isolated form due to its highly instability
Examine the following equations.
A. 23490Th→23491Pa+0−1e+γ
B. 60∗27Co→6027Co+γ
C. 23490Th→23088Ra+42He
D. 146C→147N+0−1e
Which equation or equations represent beta decay?
C
A and D
D
A and B
B
A
C and D
Answer: (A) and (D)
Options (A) and (D) represent beta decay.
Explanation:
It is very simple to find beta decay in a nuclear reaction. In beta decay , neutron breaks down into a proton and an electron. After that electron is emitted from the nucleus,while proton remains inside nucleus. The resulting daughter nuclei will have one more proton and one less neutron.
Answer:
A and D
Explanation:
I just took a test an got it right.
What is the balance equation for I2 (s) dissolving in water
Answer:
I₂ + H₂O --------→ HI + HIO
Explanation:
Iodine is not fully dissolve in water but only dissolve up to some extent.
When iodine was mixed with water it give mixture of two products.
Hydrogen iodide or hydroiodic acid (HI)Hypoiodous acid (HIO)So the balance reaction is as under
I₂ + H₂O --------→ HI + HIO
All the reactant are one mole and one one mole of each product produced in the shown reaction.
This is a reversible reaction and only 0.05% of Iodine molecule react with water and the other Iodine molecule remain in water unreacted.
what is the most common way to increase retenation of anlyates in gas choromatography analysis
Explanation:
The retention of analytes in gas chromatography can be increased by selecting mobile phase that is a weaker solvent. When the mobile phase has a lower solvent strength, solutes spend proportionally more time in the stationary phase and take longer to elute.
A new element -- quickly named Reachium by the scientific community -- is discovered. This element is found to have
two isotopes. 86.4% of all Reachium atoms are Reachium-328 and 13.6% are Reachium-333. What is the atomic mass of
this element?
a) what is the light source for a plant growing in the shade?
b) if you want to put a flowering plant that normally grows best in direct sunlight in a shady location, what could you do?
a.) Plants that thrive in the shade are often able to hold on to sunlight for extensive periods of time; they're in a sense like the camels of the plaNt WoRld.
b.) Though artificial lights are not nearly as beneficial as the sun, one could invest in one of them plant growing light thingies, but sun-loving plants might be sad if u do this instead of letting them soak in ePic rays from the sun.
what is an alloy? (this is for apex chem 2)
a. a combination of a metal with another element
b. a layering of one metal over another metal
c. a metal with a changed oxidation state
d. a substitution of one metal for another metal
Answer:
alloy is metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.nation:
Explanation:
a combination of a metal with another element
The graph of y = 3x2 + 12x + 11 is shown.
Use the graph to solve the equation 3x2 + 12x + 11 = 2
Explanation:
3*2=6
12x+11=23x
23x+6=29x
x=2
1) Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.
To which group in the Periodic Table does it belong?
A) 1 B) 3 C) 7 D) 0
Answer:
Halogen group (group 17)
Hope it helps:)
how many moles of glucose are in 19.1g of glucose?
Answer:
0.106 mol (3s.f.)
Explanation:
To find the number of moles, divide the mass of glucose (in grams) by its Mr. Glucose has a chemical formula of C6H12O6. To find the Mr, add all the Ar of all the atoms in C6H12O6.
Ar of C= 12, Ar of H= 1, Mr of O= 16
These Ar values can be found on the periodic table.
Mr of glucose= 6(12)+ 12(1) + 6(16)= 180
Moles of glucose
= mass ÷ mr
= 19.1 ÷ 180
= 0.106 mol (3 s.f.)