Answer:
Na₂SO₄•(H₂O)₆.
Explanation:
The mass that is lost when the sample is heated is water.
Let's assume we have 100 g of the hydrate:
43 grams would be water (H₂O), while the rest (100-43=57) would be sodium sulfate anhydrous (Na₂SO₄).
We convert both those masses to moles, using their respective molar masses:
H₂O ⇒ 43 g ÷ 18 g/mol = 2.39 molNa₂SO₄ ⇒ 57 g ÷ 142.04 g/mol = 0.40 molWe can write those results as (Na₂SO₄)₀.₄₀•(H₂O)₂.₃₉. Now we just need to multiply those numbers so that they become integers.
If we multiply both coefficients by 5 we're left with (Na₂SO₄)₂•(H₂O)₁₂.
Simplify and thus the final answer is Na₂SO₄•(H₂O)₆.
In the presence of an acid catalyst, cyclohexanol (100.16 g/mol) is dehydrated to give cyclohexene (82.14 g/mol) and water. Reaction scheme illustrating the dehydration of cyclohexanol in the prescence of acid catalyst to cylcohexene and water. A dehydration reaction starting with 4.1 g cyclohexanol produces 3.0 g cyclohexene. Calculate the percent yield for this reaction. Report your answer with two significant figures.
Answer:
88%
Explanation:
Step 1: Write the balanced equation
C₆H₁₁OH ⇒ C₆H₁₀ + H₂O
Step 2: Calculate the moles corresponding to 4.1 g of C₆H₁₁OH
The molar mass of C₆H₁₁OH is 100.16 g/mol.
4.1 g × 1 mol/100.16 g = 0.041 mol
Step 3: Calculate the theoretical yield, in moles, of C₆H₁₀
The molar ratio of C₆H₁₁OH to C₆H₁₀ is 1:1. The theoretical yield of C₆H₁₀, in moles, is 1/1 × 0.041 mol = 0.041 mol.
Step 4: Calculate the mass corresponding to 0.041 moles of C₆H₁₀
The molar mass of C₆H₁₀ is 82.14 g/mol.
0.041 mol × 82.14 g/mol = 3.4 g
Step 5: Calculate the percent yield of C₆H₁₀
We will use the following expression.
percent yield = experimental yield/theoretical yield × 100%
percent yield = 3.0 g/3.4 g × 100% = 88%
Which refers to any disturbance that carries energy from one place to another?
Answer:
A wave
Explanation:
A wave is a disturbance that carries energy from one place to another. Matter is not carried with the wave but instead a wave can move through matter.
Answer:
A Wave
Explanation:
Help ASAP please
Which statement best describes the reaction pathway graph for an exothermic reaction but not an endothermic reaction?
It has a hill in the middle that is the highest point.
It has a valley in the middle that is its lowest point.
The reactants are higher in energy than the products.
The products are higher in energy than the reactants.
Answer: C ) The reactants are higher in energy than the products
Explanation:
The enthalpy that is a state variable that identifies the content of heat. Then the change of enthalpy for the exothermic reactions is negative, meaning that the energy of the products is lower than the energy of the reactants.
1. A chemical reaction where reactants exchange places in the product. *
(10 Points)
Synthesis
Decomposition
Replacement
Answer:
Replacement is your answer
________ gas is evolved in cathode during the electrolysis of water. 20 points answer fast
Answer:
hydrogen
Explanation:
In electrolysis of water, gas evolved at cathode is hydrogen
Calculate the number of moles in 15.5g of CaSO4.5H2O
Answer:
No. of moles = 0.0685
Explanation:
Given mass, m = 15.5g
We need to find the number of moles in 15.5 g of CaSO₄.5H2O
First, we find the mass of CaSO₄.5H2O.
M = (1×40)+(1×32)+(4×16)+(5×18)
M = 226 g/mol
We know that,
Number of moles = given mass/molar mass
[tex]n=\dfrac{15.5\ g}{226\ g/mol}\\\\n=0.0685\ \text{mol}[/tex]
Hence, there are 0.0685 moles in 15.5 g of CaSO₄.5H2O.
How many grams of Kr are in 2.00 mol of Kr? (4)
Answer:
1 mole is equal to 1 moles Krypton, or 83.798 grams.
Explanation:
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.
If hexane (C6H14C6H14), octane (C8H18C8H18), and octanol (C8H17OHC8H17OH) are heated evenly at different altitudes, rank them according to the order in which you would expect them to begin boiling.
A) Hexane at high altitude.B) Octane at high altitude.C) Octane at sea level.D) Octanol at sea level.
Answer:
Octanol at sea level> Octane at sea level > Octane at high altitude > Hexane at high altitude
Explanation:
Let us have it behind our minds that the boiling points of alkanes depends on the length of the alkyl chain. The longer the chain length, the higher the boiling point of the alkane.
Also, octanol has hydrogen bonding between its molecules in addition to dispersion forces, hence it has a higher boiling point than octane and hexane at sea level.
So, the order of boiling points required at the specified altitudes is;
Octanol at sea level> Octane at sea level > Octane at high altitude > Hexane at high altitude
Please help!!! It's Due TODAY!!! Imagine a made up polyatomic ion called tritoborate. Calcium tritoborate has the formula Ca2B3O8.
a. What is the formula for tritoborate? You must include the charge (both the sign and the
magnitude). (2 pts)
b. Write both the formula and the name for the compound formed when Fe3+ combines
with tritoborate? (2 pts)
Answer:
a. The formula for tritoborate ion is B₃O₈²⁻
b. The formula of the compound formed will be Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
Explanation:
The formation of compounds by atoms of elements occurs in accordance with the valencies of the elements. Valency refers to the combining power of an element. For metallic elements, it is usually the number of electrons they can give up or lose while for non-metallic elements, it is the number of electrons they can accept. The valency of an atom of an element is related to its oxidation number. Metals have positive oxidation numbers while non-metals have negative oxidation numbers. Sometimes, two or more atoms combine together and react as a single unit and may carry a positive or negative charge. These are known as a radicals. For example, ammonium ion, NH₄⁺.
In the given question, calcium tritoborate, CaB₃O₈ is formed from the combination of calcium ion and tritoborate ion. Calcium ion carries the charge of +2, therefore, the tritoborate ion must have a charge of -2 in order to form a compound since the overal charge on a compound is zero.
a. let the tritoborate ion be represented by X
Ca = +2, X = ?
+2 + X = 0
X = -2
Thus, the formula for tritoborate ion is B₃O₈²⁻
b. When tritoborate ion combines with iron (iii) ion, Fe³⁺, two moles of Fe³⁺ will be required to react with three moles of B₃O₈²⁻ in order to have a neutral compound. The formula of the compound formed will be: Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
The photograph shows one of the boats in a science club's toy boat race. All the boats were powered by identical
rubber bands. Judges used stopwatches to time how long each rubber band took to unwind. The table shows some
of the data the judges collected.
Boat
Time
(5)
Acceleration
(m/s)
N
1.6
1.4
1.1
Mass of
Boat (kg)
0.125
0.116
0.130
0.118
P
Penywise/Dreamstime.co
Q
1.5
1.2
2.1
1.0
1.8
R
Which boat experienced the greatest unbalanced force?
Answer:
Boat p
Explanation:
Answer:
boat p
Explanation:
Different substances require different amounts of heat to change their temperature by a given amount. This behavior of the materials is called the specific heat and is a characteristic of each material.
a. True
b. False
Answer: True
Explanation:
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
It is dependent on the type of material and is fixed for a particular type of material. For example: The specific heat capacity of iron material is fixed and the value is [tex]0.444J/g^0C[/tex]
Which of the following will decrease the pressure of a gas in a closed container?
A. increasing the number of molecules
B. increasing the amount of light
C. increasing the temperature
D. increasing the volume
please answer asap thank you :))
Increasing the number of molecules will decrease the pressure of a gas in a closed container. Hence, option A is correct.
What is pressure?Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
An increase in the number of gas particles in the container increases the
frequency of collisions with the walls and therefore the pressure of the gas.
If the temperature decreases the pressure will also decrease.
Temperature is a measure of kinetic energy. When the temperature inside the container decreases the kinetic energy will also decrease.
Hence, option A is correct.
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True/False: The definition of an ion is when the number of neutrons of an atom changes from the original neutral state.
Answer:
False. a ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Explanation:
A magnetic field protects Earth from the Sun's high-energy particles. What two processes are involved in the formation
of Earth's magnetic field?
the movement of materials in Earth's mantle and Earth's rotation
the movement of metals in Earth's core and Earth's rotation
the movement of solar wind toward Earth and Earth's revolution
the movement of eruptions from the Sun's surface and Earth's revolution
Answer:
B
Explanation:
Answer:
definetly b
Explanation:
A reaction mixture in a 5.19 L flask at a certain temperature contains 26.9 g CO and 2.34 g H2. At equilibrium, the flask contains 8.65 g CH3OH. Calculate the equilibrium constant (Kc) for the reaction at this temperature.
Answer:
26.7
Explanation:
The reaction that takes place is:
CO + 2H₂ ↔ CH₃OHWe convert the given masses to moles, using their respective molar masses:
CO ⇒ 26.9 g ÷ 28 g/mol = 0.961 molH₂ ⇒ 2.34 g ÷ 2 g/mol = 1.17 molCH₃OH ⇒ 8.65 g ÷ 32 g/mol = 0.270 molThe initial concentrations for each species are:
CO ⇒ 0.961 mol / 5.19 L = 0.185 MH₂ ⇒ 1.17 mol / 5.19 L = 0.225 MCH₃OH ⇒ 0While the equilibrium concentration for CH₃OH, [CH₃OH]eq is:
0.270 mol / 5.19 L = 0.052 MWe put the data in a table:
CO + 2H₂ ↔ CH₃OH
initial 0.185 0.225 ↔ 0
eq (0.185 - x) (0.225-2x) ↔ x
We know that x = 0.052 M (That's the equilibrium concentration of CH₃OH).
We proceed to calculate [CO]eq and [H₂]eq:
[CO]eq = 0.185 - 0.052 = 0.133 M[H₂]eq = 0.225 - 2*0.052 = 0.121 MFinally we calculate the equilibrium constant:
Kc = [tex]\frac{[CH_3OH]_{eq}}{[CO]_{eq}([H_2]_{eq})^2}[/tex] = 26.7The equilibrium constant (Kc) for the reaction at this temperature is 26.7
Chemical reaction:CO + 2H₂ ⇄ CH₃OH
Conversion of moles:CO ⇒ [tex]\frac{26.9 g}{28 g/mol} = 0.961 mol[/tex]
H₂ ⇒ [tex]\frac{2.34 g }{ 2 g/mol} =1.17 mol[/tex]
CH₃OH ⇒ [tex]\frac{8.65 g}{32 g/mol} = 0.270 mol[/tex]
The initial concentrations for each species are:CO ⇒ [tex]\frac{0.961 mol}{5.19 L} = 0.185 M[/tex]
H₂ ⇒ [tex]\frac{1.17 mol}{5.19 L } = 0.225 M[/tex]
CH₃OH ⇒ 0
While the equilibrium concentration for CH₃OH, [CH₃OH]eq is:[tex]\frac{0.270 mol}{ 5.19 L} = 0.052 M[/tex]
We put the data in a table:
CO + 2H₂ ⇄ CH₃OH
Initial 0.185 0.225 0
Equilibrium (0.185 - x) (0.225-2x) x
x = 0.052 M (That's the equilibrium concentration of CH₃OH).
We proceed to calculate [CO]eq and [H₂]eq:
[tex][CO]_{eq}= 0.185 - 0.052 = 0.133 M\\\\\\[H_2]_{eq} = 0.225 - 2*0.052 = 0.121 M[/tex]
Calculation of equilibrium constant:[tex]K_c =\frac{[CH_3OH]_{eq}}{[CO]_{eq}[H_2_{eq}]^2} = 26.7[/tex]
Thus, the equilibrium constant (Kc) for the reaction at this temperature is 26.7
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Here is the reaction of carbamic acid and ammonia to form an amide and water. There is a scheme of a reversible reaction where carbamic acid reacts with ammonia to give water and an unknown compound. Carbamic acid is H2NCOH with an oxygen atom attached to the carbon atom by a double bond. Ammonia is a nitrogen atom with three H atoms attached. Water is HOH. Draw the amide product of this reaction.
Answer:
See explanation
Explanation:
I have attempted to show the sequence of the reaction between carbamic acid and ammonia to form an amide and water and urea.
The reaction first involves the protonation of ammonia to give ammonium carbamate.
When ammonium carbamate is heated to 130-140 degrees, we obtain urea and water as the final products of the reaction
How many moles of O2, form as 80 g of KClO3 are totally consumed?
M(KCIO3)= 122.45 g/mol.
Answer:
0.975 mole of O₂
Explanation:
We'll begin by calculating the number of mole in 80 g of KClO₃. This can be obtained as follow:
Molar mass of KClO₃ = 122.45 g/mol.
Mass of KClO₃ = 80 g
Mole of KClO₃ =?
Mole = mass /Molar mass
Mole of KClO₃ = 80 / 122.45
Mole of KClO₃ = 0.65 mole
Next, we shall write the balanced equation for the reaction. This is illustrated below:
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Finally, we shall determine the number of mole O₂ produced by the decomposition of 80 g (i.e 0.65 mole) of KClO₃. This can be obtained as follow:
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Therefore, 0.65 mole of KClO₃ will decompose to produce = (0.65 × 3)/2 = 0.975 mole of O₂.
Thus, 0.975 mole of O₂ was obtained from the reaction.
A sample of quartz, which has a specific heat capacity of , is dropped into an insulated container containing of water at and a constant pressure of . The initial temperature of the quartz is . Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct number of significant digits.
This question is incomplete, the complete question is;
A 17.0 g sample of quartz, which has a specific heat capacity of 0.730 J.g⁻¹°C⁻¹, is dropped into an insulated container containing 200.0 g of water at 85°C and a constant pressure of 1 atm . The initial temperature of the quartz is 7.2°C.
Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct 3 number of significant digits.
Answer:
the equilibrium temperature of the water is 83.9°C
Explanation:
Given the data in the question;
Since no heat is absorbed from or by the container, or the surroundings;
Then Heat lost by the quartz = heat gained by water
ΔH1 = ΔH2
DH = mcΔT
where m is mass, C is specific heat capacity and ΔT is temperature change;
so
(mcΔT)1 = (mcΔT)2
we know that; specific heat capacity of is 4200 Joule/Kilogram K (J/kg∙K) = 4.2 (J/g∙°C)
we substitute
17.0g × 0.730 J.g⁻¹°C⁻¹ × ( 7.2°C - T2) = 200.0g × 4.2 J/g∙°C × ( T2 - 85°C)
89.352 - 12.41T2 = 840T2 - 71400
840T2 + 12.41T2 = 89.352 + 71400
852.41T2 = 71489.35
T2 = 71489.35 / 852.41 = 83.86°C ≈ 83.9°C
Therefore, the equilibrium temperature of the water is 83.9°C
Draw the major organic product in the reaction scheme. Be sure to clearly show stereochemistry (if applicable).The starting material is an alkyne where carbon 1 is bonded to cyclopentane and carbon 2 is bonded to H. Step 1 is N a N H 2. Step 2 is C H 3 I. Step 3 is sodium in liquid ammonia.
Answer:
See explanation below
Explanation:
According to what you state in the problem, we have an ethyne bonded to a cyclopentane.
So, in the 1st step reacts with NaNH₂. In this step, the base which is very strong will substract the hydrogen from carbon 2, forming an anion in there. In the second step, this anion will react with CH₃I, and form a larger chain, the methyl group is attached to the alkyne.
Finally in the last step reacts with sodium in ammonia, this is to reduct the triple bond to just a single bond and leave an alkane only. The picture below shows these steps.
Hope this helps.
onsider the iodination of salicylamide by sodium iodide and sodium hypochlorite via an electrophilic aromatic substitution to form iodo-salicylamide. Reaction scheme illustrating the iodination of salicylamide by sodium iodide and sodium hypochlorite via an electrophilic aromatic substitution to form iodo-salicylamide. Calculate the molar masses of the reactants and product. Report molar masses to 1 decimal place.
Answer:
The answer is "[tex]\bold{263 \ and \ 137.1 \frac{g}{ mol}}[/tex]".
Explanation:
The chemical formula for Salicylamide: [tex]C_7H_7NO_2[/tex]
[tex]\to (12.011 \ \frac{g}{mol} \times 7)+(1.008 \ \frac{g}{mol} \times 7)+(14.0067 \frac{g}{mol} \times 1)+(15.999 \frac{g}{mol} \times 2) \\\\\to (84.077 \ \frac{g}{mol} )+(7.056 \ \frac{g}{mol} )+(14.0067 \frac{g}{mol})+(31.998 \frac{g}{mol} ) \\\\\to (84.077 \ \frac{g}{mol} )+(7.056 \ \frac{g}{mol} )+(14.0067 \frac{g}{mol})+(31.998 \frac{g}{mol} ) \\\\ =137.1377 \approx 137.1\ \frac{g}{mol}[/tex]
The chemical formula of Iodosalicylamide:[tex]C_7H_6INO_2[/tex]
[tex]\to (12.011\frac{g}{mol}\times 7)+(1.008\frac{g}{mol}\times 6)+(126.904\frac{g}{mol}\times 1)+(14.0067\frac{g}{mol}\times 1)+(15.999\frac{g}{mol}\times 2) \\\\\to (84.077\frac{g}{mol})+(6.048\frac{g}{mol})+(126.904\frac{g}{mol})+(14.0067\frac{g}{mol})+(31.998\frac{g}{mol}) \\\\=263.0337 \approx 263.0\ \frac{g}{mol}[/tex]
Would you consider an aquifer a renewable resource? Why or why not?
Answer:
an aquifer is a renewable resource
Explanation:
Aquifers are defined as the groundwater found deep in the layers of rocks.
An aquifer is considered as a renewable resource because groundwater is renewed over time. Aquifers are water resources and follow hydrological cycle through which it can renew itself.
Some of the deep aquifers are considered as nonrenewable resource because it toll hundreds of years to accumulate.
Hence, the correct answer is yes an aquifer is a renewable resource except some deep aquifers.
Menstruation occurs on a ______ interval from puberty until menopause
A. Three months
B. Two months
C. Half month
D. One month
In a disproportionation reaction, the disproportionate substance
A. has exactly one oxidation state.
B. has exactly two oxidation states.
C. has at least three oxidation states.
D. has either one or two oxidation states.
Answer:
The answer is C: has at least three oxidation states.
Explanation:
you're welcome
Answer:
C
Explanation:
got it right on Edge
Ok so I don't understand how to do this-
Can someone explain how?
Shanghai, China (31° N, 121° E)
1. 24-hr Average Yearly Temperature in ºC
2. Total Yearly Precipitation in mm
Answer:
Oh, you are supposed to look up the yearly temp, and yearly rain for a certain area. I did this before!
which type of electromagnetic radiation is used in security baggage scanners
X-rays, because
I did it and got it right
Answer:
XX-rayX-ray
Explanation:
Alright
Ooh, yeah
I'll admit, I was wrong, what else can I say, girl?
Can't you blame my head and not my heart?
I was drunk, I was gone, that don't make it right, but
I promise there were no feelings involved, mmh
She said, "Boy, tell me honestly
Was it real or just for show?", yeah
She said, "Save your apologies
Baby, I just gotta know"
How long has this been goin' on?
You been creepin' 'round on me
While you're callin' me "baby"
How long has this been goin' on?
You've been actin' so shady (shady)
I've been feelin' it lately, baby
Ooo-oh (yeah)
Ooo-oh (encore)
Oooh-ooh-oh
NEVER GONNA GIVE YOU UP,
NEVER GONNA LET YOU DOWN,
NEVER GONNA RUN AROUND AND DESERT YOU!
NEVER GONNA MAKE YOU CRY,
NEVER GONNA SAY GOODBYE..
Answer:
How long By Charlie Puth
Suppose a disease wipes out most of the fox population in
the food web shown.
Mountain
lion
Deer
Hawk
Fox
Rabbit
Owl
Snake
Green
plant
Mouse
Which two populations are most likely to increase as a result?
A. Mountain lion
B. Mouse
ロロロロ
O C. Rabbit
D. Green plant
If the fox population in the given food web is significantly reduced due to a disease, two populations that are most likely to increase as a result are the populations of A. Mountain lion and C. Rabbit.
The decrease in the fox population can disrupt the balance of the food web. Since foxes are natural predators of rabbits, the reduced presence of foxes would lead to a decrease in predation pressure on rabbits. This would allow the rabbit population to increase because their natural predators are now less abundant. Also, with a decline in the fox population, there would be fewer predators to control the population of smaller animals like mice. Hence, the mouse population could also increase due to reduced predation pressure. The mountain lion population, being a predator higher up in the food chain, may indirectly benefit from the increase in rabbit and mouse populations. The increase in prey availability could potentially lead to an increase in the mountain lion population as they have more food resources available. The green plant population (D) is unlikely to directly benefit from the decrease in the fox population since they are not directly influenced by predation from foxes. Their population dynamics are primarily driven by other factors such as availability of sunlight, water, and nutrient levels. The correct answer is A. Mountain lion and C. Rabbit
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If you eat food containing 1800 Calories per day, according to an advertisement
you will lose weight. A handbook says that a person uses 20,000 kJ per day, given normal waking and sleeping activities. Will the person lose weight if he or she eats food as suggested by the advertisement?
Answer:
No he or she will not lose weight
No, the person will not lose weight if they eat food containing 1800 Calories per day based on the given information.
To determine if a person will lose weight, we need to compare their calorie intake with their calorie expenditure. The advertisement suggests consuming 1800 Calories per day, which is equivalent to approximately 7536 kJ (1 Calorie = 4.184 kJ).
The handbook states that a person uses 20,000 kJ per day, which is their estimated calorie expenditure. If the person consumes 7536 kJ (1800 Calories) and expends 20,000 kJ per day, there is an energy imbalance. The person is consuming fewer calories than they are expending, resulting in a calorie deficit.
In this scenario, the person is likely to lose weight. To maintain their current weight, their calorie intake should match their calorie expenditure. However, since their calorie intake is lower than their expenditure, their body will need to rely on stored energy (fat reserves) to make up the difference. This can lead to weight loss over time.
It's important to note that weight loss is influenced by various factors, including individual metabolism, body composition, and overall health. Caloric intake should be balanced with proper nutrition and physical activity to support overall well-being. It's always advisable to consult a healthcare professional or registered dietitian for personalized guidance on weight management.
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Pls answer this two ASAP PLSSSSSSSS
Answer:
1. aa
2. They have similar DNA
Explanation:
1. According to the question 1, wrinkled seeds (A) are dominant over round seeds (a) in pea plants. This means that, based on the law of dominance proposed by Mendel, wrinkled seeds will be expressed over round seeds in a heterozygous state (Aa).
However, since the round seed phenotype is a recessive trait, it will only be expressed when the alleles for round seeds (a) are the same in the gene i.e. aa genotype.
2. Based on the information in question 2, Ricky, who is working on a family tree for his school project, realizes that his close relatives all look similar in the pictures he collected. This is possible because of the SIMILARITY OF THEIR DNA (genetic material). Note that, relatives are connected by the genes that are inherited from one another, hence, they possess a similar DNA, which is the most valid reason for the resemblance.
if you start with 4.3 moles of NH3, how many moles of NANH2 can be produced
Explanation:
Mole ratio of NH3 to NaNH2 = 2 : 2.
Moles of NaNH2 produced
= 4.3mol * (2/2) = 4.3mol.
