The balanced equation for the following redox reaction using the oxidation number method is as follows:
2K + 2I− + Cl 2 → I2 +2Cl− +2K+
What is a redox reaction?A redox reaction in chemistry is a chemical reaction in which some of the atoms have their oxidation number changed.
According to this question, the following balanced chemical equation is given:
Cl2 (g) + KI (aq) → I2 (s) + KCl (aq)
The oxidation number of the ions in a redox reaction changes, and in this case, the ionic reaction is as follows:
2K + 2I− + Cl 2 → I2 + 2Cl− +2K+
Learn more about redox reaction at: https://brainly.com/question/13293425
#SPJ1
Once balanced, what is the coefficient of HCl in the following reaction:
Mg + HCl → MgCl2 + H2
Group of answer choices
A. 1
B. 2
C. 0
D. 3
Answer:
B. 2
I hope this helps.
Explanation:
Mg + 2HCl → MgCl2 + H2
The pressure on 20 mL of a gas at constant temperature is changed from 4.0 atm to 2.0 atm. What is the new volume?
Answer:
40 ml
Explanation:
boyles law
Pi Vi = PƒVƒ
4 * 20 = 2 * Vƒ
40 ml = Vƒ
https://brainly.com/question/13802011
What is the name of an isotope having 29 protons and 23 neutrons? Write the elemental symbol and mass number of this isotope.
Answer:
copper - 52 (or Cu - 52)
⁵²Cu
Explanation:
Isotopes are different atoms of the same element that differ in the number of neutrons. Therefore, you can determine which element this is by examining the number of protons. All atoms with 29 protons are copper (Cu).
The mass number is the total number of protons and neutrons in an atom. Therefore, the mass number of this isotope is 52 (29 + 23 = 53). When writing an elemental symbol, the mass number is found on the top left.
As such, the name of this isotope is copper - 52 (or Cu - 52) and the symbol is ⁵²Cu.
If the pressure of 1.5 moles of a gas is 2 atm and the temperature is 27°C, what is the volume of the gas?
Group of answer choices
A. 9.25 L
B. 5.0 L
C. 37.0 L
D. 18.5 L
Answer:
9.25l
Explanation:
9.25l was correct answer
The ideal gas law is a fundamental equation that describes the behavior of an ideal gas. It relates the pressure (P), volume (V), temperature (T), and number of moles (n) of an ideal gas using the ideal gas constant (R). The volume of the gas is 18.5 L. Hence option D is correct.
We can use the ideal gas law to solve this problem:
PV = nRT
where:
P is the pressure of the gas (in atm)
V is the volume of the gas (in L)
n is the number of moles of the gas
R is the ideal gas constant (0.08206 L·atm/mol·K)
T is the temperature of the gas (in K)
Plugging in the values from the problem, we get:
2 atm * V = 1.5 mol * 0.08206 L·atm/mol·K * 300 K
V = (1.5 mol * 0.08206 L·atm/mol·K * 300 K) / 2 atm
V = 18.5 L
Therefore, the volume of the gas is 18.5 (option D).
To know more about ideal gas law:
https://brainly.com/question/30458409
#SPJ3
Hydrochloric Acid would best be described as a:
Group of answer choices
A. Arrhenius, BrØnsted-Lowrey and Lewis Base
B. Arrhenius, BrØnsted-Lowrey and Lewis Acid
C. BrØnsted-Lowrey and Lewis Acid
D. Arrhenius and Lewis Acid
Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid (option B).
What is Arrhenius, Brønsted-Lowry acid?Arrhenius acid is any substance that dissociates in an aqueous solution to form hydrogen ions (H+) or proton.
On the other hand, a Brønsted-Lowry acid is any substance that can donate a proton or hydrogen ion to another substance.
Hydrochloric acid (HCl) can be categorized as an Arrhenius acid and Brønsted-Lowry acid because it has the ability to donate H+ and increase the hydrogen ion concentration of an aqueous solution.
Also, Lewis cids are the chemical substances that are able to accept electron pairs.
Therefore, Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid.
Learn more about acids at: https://brainly.com/question/516295
#SPJ1
What is the frequency of
an electron with a wavelength
of 225 nm?
Answer:
1.33 x 10¹⁵ Hz
Explanation:
You can find the frequency using the following equation:
f = c / λ
In this equation,
-----> f = frequency (Hz)
-----> c = speed of light (3.0 x 10⁸ m/s)
-----> λ = wavelength (m)
Before we can plug the values into the equation, we need to convert the wavelength from nm to m.
225 nm 1 m
---------------- x -------------------- = 2.25 x 10⁻⁷ m
1 x 10⁹ nm
f = c / λ
f = (3.0 x 10⁸ m/s) / (2.25 x 10⁻⁷ m)
f = 1.33 x 10¹⁵ Hz
The frequency of a wave can be calculated using the wavelength and and speed of light. The frequency of a wave with 225 nm is 1.33 × 10¹⁵ Hz.
What is frequency ?Frequency of a wave is the number of wave cycles per second. It mathematically taken as the inverse of time taken to travel and it have a unit of s⁻¹ other than Hz.
The wavelength of an electromagnetic wave is the distance between two consecutive crests or troughs.Wavelength and frequency are in inverse relationship. For a longer wavelength the frequency will be lower.
Higher frequency waves are more energetic than longer wavelengths. Thus energy and frequency are in direct proportion
It is given that the wavelength of the electron is 225 nm. Consider the electron behaving as wave and the frequency v can be calculated using the speed of light c as follows:
[tex]v = C/\lambda[/tex]
= (3 ×10⁸ m/s) /(225 ×⁻⁹ m)
= 1.33 × 10¹⁵ Hz.
Hence, the frequency of an electron with a wavelength of 225 nm is 1.33 × 10¹⁵ Hz.
To find more about frequency, refer the link below:
https://brainly.com/question/14316711
#SPJ2
Which of the following is NOT an example of a colligative property?
Group of answer choices
A. Salt is added to ice to make homemade ice cream.
B. Salt is added to roads before a snow storm.
C. Antifreeze is added to a radiator of a car.
D. Salt water dehydrates someone that drinks it.
D. The option that is NOT an example of a colligative property is salt water dehydrates someone that drinks it.
What is colligative property?
Colligative properties are the physical changes that result from adding solute to a solvent.
Colligative Properties depend on how many solute particles are present as well as the solvent amount, but they do NOT depend on the type of solute particles, although do depend on the type of solvent.
One important thing to note is that colligative property is going to change the melting point or the boiling point of a substance.
Thus, the option that is NOT an example of a colligative property is salt water dehydrates someone that drinks it.
The correct option is D.
Learn more about colligative property here: https://brainly.com/question/1831338
#SPJ1
How many grams of oxygen gas are needed to react completely with 28.442 grams of sulfur dioxide gas ?
Answer:
SO2(g) + O2(g) SO3(g) (needs to be balanced. Balance it by placing a 1/2 in front of the 02.) This is a 5-sig-fig problem, so when you calculate your molar masses, you must use all of the sig figs available to you from the periodic table. That's how you can get this problem correct. Melissa Maribel likes to round the numbers from the periodic table, and usually that is ok. But for problems where you have many sig figs, your molar masses from the periodic table must have at least as many sig figs as your data. Therefore, for each oxygen atom, please use 15.9994 g/mol. For each sulfur atom, please use 32.066 g/mol. Thank you.
Answer:
7.1029 gms of O2
Explanation:
First balance the equation to get
2 SO2 + O2 ====> 2 SO3
Mole weight of sulfur dioxide gas
S + 2 O == 32.066 + 2 * 15.999 = 64.064 gm/mole ( 5 signif digits)
28.442 gm / 64.064 gm/mole = .44396 mole of SO2 ( 5 sig digits)
From the balanced equation, you can see you need 1/2 as many moles of O2 as SO2:
mole weight of O2 = 2 * 15.999 = 31.998 gm / mole ( 5 sig digits)
now you need 1/2 of .44396 moles of this
1/2 * .44396 * 31.998 = 7.1029 gm ( 5 sig digits)
To answer this question, you may need access to the periodic table of elements.
How many bonding electrons are in the Lewis structure of NH₃?
a.) 6
b.) 2
c.) 5
d.) 4
Answer:
6 bonding electrons are needed.
For the reaction: 3 H2(g) + N2(g) <--> 2 NH3(g), the concentrations at equilbrium were [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3.1 x 105
B. K = 560
C. K = 5.6 x 10-4
D. K = 1.8 x 10-3
The equilibrium constant, k of the reaction in which case, the concentrations of the given reactants and products are as indicated is; Choice A; K = 3.1 x 10⁵
What is the equilibrium constant , k of the reaction as described in the task content?It follows from above that the concentrations of the reactants and products are as follows; [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M at equilibrium.
Hence, the equilibrium constant of the reaction in discuss is;
K = [5.6]²/[0.10]³[0.10]
k = 5.6² × 10⁴
k = 3.136 × 10⁵
K = 3.1 × 10⁵.
Read more on equilibrium constant;
https://brainly.com/question/1619133
#SPJ1
20.0g of H2(g) and 32g of O2(g) are reacted produce H2O(l). The amount of hydrogen left behind after completion of reaction is?
Answer:
8 moles = 16 gm of H2 left over
Explanation:
The balanced equation is
2 H2 + O2 ===> 2 H2 O
20 g H2 = 20 g / 2 gm/mole = 10 moles of H2
32 g O2 = 32g / 32 g / mole = 1 mole O2
From the balanced equation, you can see each 2 moles of H2 requires 1 Mole of O2
you would need 20 moles of O 2 to react withe the 10 moles of H2
but you only have 1 mole of O2 so 8 moles of H2 will be left
12.2 g of N₂ gas at 1132 torr and 91°C has a volume of
Answer:
8.73 L
Explanation:
First, you need to convert grams to moles using the molar mass.
Molar Mass (N₂): 2(14.009 g/mol)
Molar Mass (N₂): 28.018 g/mol
12.2 grams N₂ 1 mole
---------------------- x ------------------------ = 0.435 moles N₂
28.018 grams
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (torr)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (62.36 torr*L/mol*K)
-----> T = temperature (K)
After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation.
P = 1132 torr R = 62.36 torr*L/mol*K
V = ? L T = 91 °C + 273.15 = 364.15 K
n = 0.435 moles
PV = nRT
(1132 torr)V = (0.435 moles)(62.36 torr*L/mol*K)(364.15 K)
(1132 torr)V = 9888.015
V = 8.73 L
Given the following equation:
Mg(OH)2 + 2HCI --> MgCl2 + 2H₂O
How many moles of water form from one gram of magnesium hydroxide?
26
58
0.03
116
Question 5 (1 noint)
:
Answer:
0.084 moles of H₂O
Explanation:
RAM of Mg = 24, of H = 1, of O = 16
Mg(OH)₂ + 2HCI --> MgCl2 + 2H₂O
Mole of Mg(OH)₂ = mass/MolarMass
= 1/24 = 0.042mol
From the equation,
1 mole of Mg(OH)₂ = 2 moles of H₂O
0.042mol of Mg(OH)₂ = 2 × 0.042 of H₂O
= 0.084 moles of H₂O
Given the following reaction:
2 HCl(aq) + Mg(s) <--> MgCl2(aq) + H2(g) + heat
When the temperature is decreased what changes occur?
Group of answer choices
A. In order to restore equilibrium, the reaction shifts right, towards reactants.
B. In order to restore equilbrium, the reaction shifts left, towards products.
C. In order to restore equilibrium, the reaction shifts left, towards reactants.
D. In order to restore equilibrium, the reaction shifts right, towards products.
Answer:D. In order to restore equilibrium, the reaction shifts right, towards products
Explanation:
The _____ is the attraction of the electrons of one atom to the protons of the other atom, leading to a bond.
a. oxidation reaction
b.electron orbital
c.gravitational pull
d.electrostatic force
Answer:
d
Explanation:
The + charge of the proton and the - charge of the electron create a electrostic force of attraction ( opposites attract)
10 Points
The International Commission of Radiological Protection has set the limit for yearly radiation exposure at 1000 uSv. What is the risk
associated with this dose?
A. No risk at this limit or below.
OB. 1/2400 chance of cancer over a 40 year period.
OC. 1/1000 chance of cancer over a 40 year period.
OD. 1/100,000 chance of cancer over a 40 year period.
The maximum allowable annual dose of radiation has been set at 1000 uSv by the worldwide commission on radiological protection. At this threshold or lower, there is no risk.
What is S(sievert)?
The sievert, a measurement used to measure radiation, is used to calculate how much radiation is taken in by human tissues.1000 millisieverts are equal to one sievert (mSv) [ 1 Sv= 1000 mSv]. There are 1,000 microsieverts in a millisievert[ 1 mSv = 1000 uSv]Here are some details concerning the risks increasing radiation levels cause to our health:
Yukio Edano, Japan's Chief Cabinet Secretary, had said that radiation levels near the damaged facility on the northeast coast may rise to 400 millisieverts (mSv) per hour.The lowest dose of exposure that causes any rise in cancer probability is readily visible is 100 mSv per year. Five out of every 100 people exposed to a cumulative 1,000 mSv (1 sievert) may likely get a deadly malignancy several years later.The central nervous system, as well as the red and white blood cells, are destroyed by high radiation doses or acute radiation exposure. This impairs the immune system, making it difficult for the sufferer to fight off diseases.One sievert (1,000 mSv), for instance, only results in radiation sickness, which includes nausea, vomiting, and bleeding, but not death. About half of individuals exposed to a single dose of 5 sieverts would perish within a month.Therefore the correct choice is an option (A).
Learn more about radiation here:
https://brainly.com/question/1497235
#SPJ1
Answer:
Answer D
Explanation:from founders Edtell :
A dose of 1000 uSv is believed to carry a 1/100,000 risk of getting cancer over 40 years due to your exposure to radiation. The average dose is around 2400 uSv.
Need help, I'm kinda panicking!
Answer:
hey I saw this on brainly and thought it will help u..
and this is not my answer I saw u needed help so I screenshot it..
have an amazing day..
and hope this is what ur looking for.
10. What are saturated and unsaturated fatty acids?
Fatty acids are the building blocks of the fat in our bodies and in the food we eat.
Functionality of fatty acids?Saturated fatty acids consists of single bond of carbon atoms and no double bondSaturated fatty acids are solids in room temperature.Only single bond of hydrocarbon chain is found.Melting point is high and have straight chainIt is soluble in vitamins and obtained from palm oil, coconut oil, and animal fats.Unsaturated fatty acids consists of carbon atoms and there will be one or more double bondsSaturated fatty acids consists of single bond of carbon atoms and no double bond is found. are liquids in room temperature.One or more bond of hydrocarbon chain.Melting point is low and have bend chains at double points.It is insoluble in vitamins and obtained from sunflower oil,walnut,fish oil.To learn more about fatty acids, refer :
https://brainly.in/question/14522042
#SPJ2
What is included in the study of chemistry?
Select one:
a.
composition and interaction of matter
b.
motion and forces
c.
the economics of manufacturing
d.
forces and technology
Explanation:
composition and interaction of matter included in the study of chemestry
Convert the following measurement
Answer:
9.9 x 10^-2 g*cm²/s²
Explanation:
9.9 × 10^-9 kg*m²/s² = g*cm²/s²
1 kg*m²/s² = 1 joule(s)
1 g*cm²/s² = 1 erg(s)
britannica
1 kg = 1000g = 1x10^3 g
1 m²= 10000 cm² = 1x10^4 cm²
add the exponents 3 and 4 which = 7
-9 + 7 = -2
9.9 × 10^-9 kg*m²/s² = 9.9 x 10^-2 g*cm²/s²
if .709 j of heat is added to water and cause the temperature to go up by .036 degrees C what mass of water is present
Answer:
0.00471 grams H₂O
Explanation:
To determine the mass, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = temperature change (°C)
The specific heat capacity of water is 4182 J/g°C. You can plug the given values into the equation and simplify to isolate "c".
Q = 0.709 J c = 4182 J/g°C
m = ? g ΔT = 0.036 °C
Q = mcΔT <----- Equation
0.709 J = m(4182 J/g°C)(0.036 °C) <----- Insert values
0.709 J = m(150.552) <----- Multiply 4182 and 0.036
0.00471 = m <----- Divide both sides by 150.552
If a chemical is oxidized it is also known as the
Group of answer choices
A. the one that is reduced
B. the product
C. oxidizing agent
D. reducing agent
Answer:
D.) reducing agent
Explanation:
Oxidized chemicals gain electrons. In order to gain these electrons, another chemical must lose electrons. So, the chemical (which will be oxidized) acts as a reducing agent, causing the other chemical to be reduced and lose electrons.
The equilibrium constant for the following reaction:
Ca(HCO3)2(s) <--> CaO(s) + 2 CO2(g) + H2O(g)
would be:
Group of answer choices
A. K = [Ca(HCO3)2] / [CaO][CO2]2[H2O]
B. K = [CaO][CO2]2[H2O] / [Ca(HCO3)2]
C. K = [CO2]2[H2O]
D. K = [CO2]2[H2O] / [Ca(HCO3)2]
Answer:
C.) [tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex]
Explanation:
The general equilibrium expression looks like this:
[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = formulas
-----> lowercase letters = balanced equation coefficients
Solids are not included in the expression, so Ca(HCO₃)₂(s) and CaO(s) should be left out. The products should be in the numerator and the reactants are in the denominator. This makes the expression:
[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex] <----- Equilibrium expression
[tex]K = {[CO_{2} ]^{c} [H_2O]^{d} }[/tex] <----- Insert gaseous formulas
[tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex] <----- Insert coefficients
Which of the following sets of elements could replace the generic "X" symbol with their own to produce a valid dot notation for the element(s)?
Select one:
a.
carbon, silicon, and germanium
b.
oxygen, sulfur, and selenium
c.
boron, aluminum, and gallium
d.
nitrogen, phosphorus and arseni
Answer:
a
Explanation:
Because of their valence electron
Carbon, Silicon and germanium has 4 as their valence electron
Nitrogen, phosphorus, and arsenic can replace the generic "X" symbol as they have five valence electrons in their outer shell.
What is a dot notation?A Lewis electron-dot symbol or dot notation is a way of representing the valence electrons of an atom using dots around the symbol of the element. The dots are equivalent to the valence electrons in an atom These dots are arranged on the left and right and above and below the symbol No more than two dots are arranged on a sideWhat are the valence electrons?Valence electrons are the electrons that are positioned in the outermost shell of an atomThey are the farthest from the nucleus and hence least tightly held electrons by the nucleusValence electrons of an atom participate in the bond and reaction and hence, they determine the reactivity of an element.Thus, nitrogen, phosphorus, and arsenic replace the X symbol as they 5 valence electrons in their outermost shell and produce a valid dot notation.
Learn more about valence electrons:
https://brainly.com/question/371590
#SPJ1
Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Which of the following sets of elements could replace the generic "X" symbol with their own to produce a valid dot notation for the element(s)?
Select one:
a. carbon, silicon, and germanium
b. oxygen, sulfur, and selenium
c. boron, aluminum, and gallium
d. nitrogen, phosphorus, and arsenic
Which of the following elements has the largest atomic radius?
Group of answer choices
A. Iron
B. Cobalt
C. Chromium
D. Calcium
The answer is calcium.
Calcium has the largest atomic radius.
For each balanced reaction, indicate the total number of atoms in the table below.
(i) Make ammonia number of atoms on reactant side is 8 and on product side is 8. (ii) Separate water number of atoms on reactant side is 6 and on product side is 6. (iii) Combust methane number of atoms on reactant side is 9 and number of atoms on product side is 9.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
(i) Make Ammonia
First we have to write the balanced chemical equation
N₂ + 3H₂ → 2NH₃
Reactant side Product side
N = 2 N = 2
H = 6 H = 6
So total number of atoms on product and reactant side is 8.
(ii) Separate Water
First we have to write the balanced chemical equation
2H₂O → 2H₂ + O₂
Reactant side Product side
H = 4 H = 4
O = 2 O = 2
So total number of atoms on product and reactant side is 6.
(iii) Combust methane
First we have to write the balanced chemical equation
CH₄ + 2O₂ → 2H₂O + CO₂
Reactant side Product side
C = 1 C = 1
H = 4 H = 4
O = 4 O = 4
So total number of atoms on product and reactant side is 9.
Thus from the above conclusion we can say that For each balanced reaction, the total number of atoms are
Reaction Total number of atoms
Reactant side Product side
Make Ammonia 8 8
Separate Water 6 6
Combust Methane 9 9
Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: For each balanced reaction, indicate the total number of atoms in the table below.
Reaction Total number of atoms
Reactant side Product side
Make Ammonia _________ __________
Separate Water _________ __________
Combust Methane _________ __________
Learn more about the Balanced Chemical Equation here: brainly.com/question/26694427
#SPJ1
If you do a lab that burns Magnesium in pure Oxygen what would the empirical formula of the compound be if you started with 0.6 g Magnesium and 0.4 g of Oxygen?
Group of answer choices
A. Mg2O2
B. Mg2O3
C. Mg3O2
D. MgO
Answer:
Empirical Formula = MgO
Kindly award branliest
Explanation:
Elements = Mg O
Mass/ 0.6g/ 0.4g/
RAM 24 16
= 0.025 0.025
Divide by
the smallest = 0.025/ 0.025/
value. 0.025 0.025
Mole ratio = 1 : 1
Empirical Formula = MgO
The equilibrium constant for the following equation:
PCl5(g) <--> PCl3(g) + Cl2(g) is 1.05 at 250 degrees Celsius. If the equilibrium partial pressures of PCl5 and PCl3 are 0.875 atm and 0.463 atm respectively, what is the equilibrium partial pressure of Cl2?
Group of answer choices
A. 1.05 atm
B. 1.98 atm
C. 0.463 atm
D. 0.054 atm
From the calculation, the partial pressure of Cl2 is 1.98 atm. Option B
What is the equilibrium constant?The term equilibrium constant refers to the value that shows us the extent to which reactants are converted into products. We know that the equilibrium constant can only be obtained by the use of the equilibrium partial pressures of each of the species.
Thus we have;
K = p PCl3 . pCl2/pPCl5
p PCl3 = partial pressure of PCl3
pCl2 = partial pressure of Cl2
pPCl5 = partial pressure of PCl5
K = equilibrium constant
Substituting values;
1.05 = 0.463 * pCl2/0.875
pCl2 = 1.05 * 0.875/0.463
pCl2 = 1.98 atm
Learn more about equilibrium constant:https://brainly.com/question/10038290
#SPJ1
Arrange the events In the Ilfe of a star In the correct order.
The events in the life of a star in the correct order is as follows: F, B, C, D, E and A.
What is the life of a star?The life of a star refers to the the events that occur in a star from when it formed newly until when it finally dies off.
When stars are newly formed, they are formed from star dust, and when just before they die, the form supernovas.
The several events in the life of a star can be arranged thus:
The temperature increases in the center of a nebula, and nuclei begin to fuse.As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.The star stays in the main sequence stage for a long time.The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.Heavy elements are created when the supernova explodes.All that remains of the star now is the core. In some cases, the star turns into a black holeIn conclusion, the life of a star is the period of its formation to its burning out or death.
Learn more about life of a star at: https://brainly.com/question/988039
#SPJ1
Note that the complete question is given below:
Arrange the events in the life of a star in the correct order.
A. All that remains of the star now is the core. In some cases, the star turns into a black hole
B. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
C. The star stays in the main sequence stage for a long time.
D. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
E. Heavy elements are created when the supernova explodes.
F. The temperature increases in the center of a nebula, and nuclei begin to fuse.
Predict the products and write a word equation and a balanced chemical reaction
equation for when aqueous lithium sulfate reacts with aqueous calcium iodide.
Answer:
1.) aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate
2.) Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)
Explanation:
This appears to be a double-displacement reaction. In these reactions, the cation of one compound swaps with the cation of another.
Therefore, lithium swaps with calcium. The new products are lithium iodide (LiI) and calcium sulfate (CaSO₄). Lithium iodide is soluble in water, whereas calcium sulfate is generally not.
The word equation (including the states of matter):
aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate
An equation is balanced when there is an equal amount of each element on both sides of a reaction. If these amounts are unequal, you can add coefficients to modify the quantities of particular molecules.
The unbalanced equation:
Li₂SO₄ (aq) + CaI₂ (aq) ------> LiI (aq) + CaSO₄ (s)
Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine
Products: 1 lithium, 1 sulfur, 4 oxygen, 1 calcium, 1 iodine
The balanced equation:
Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)
Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine
Products: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine