What mass of carbon dioxide is formed in the combustion of 78. 7 g of acetone?.

Answer:

The procedure is Filtration

Explanation:

Filtration is a process that is use to separate insoluble solid from liquid for example Salt and water.

This process uses filter paper which is placed inside a funnel and then placed inside a beaker.

The mixture of sand and water is poured into the the filter paper and water then drains out down to the funnel and the beaker.

The solid part remain at the filter paper and it is called the residue and the water is the filtrate.

The final product beaker for the reaction between nitric acid and strontium hydroxide would contain strontium nitrate and water. [Precipitation] of strontium nitrate would occur, while water would remain in the solution. The beaker may also contain some excess nitric acid if it was not completely neutralized by strontium hydroxide.

When nitric acid (HNO3) reacts with strontium hydroxide (Sr(OH)2), a neutralization reaction occurs. The balanced chemical equation for this reaction is:

2HNO3 + Sr(OH)2 -> Sr(NO3)2 + 2H2O

In this reaction, the hydrogen ions (H+) from nitric acid react with the hydroxide ions (OH-) from strontium hydroxide to form water (H2O). The remaining components, strontium ions (Sr2+) and nitrate ions (NO3-), combine to form strontium nitrate (Sr(NO3)2), which is a soluble salt.

In the final product beaker, the strontium nitrate would be in the form of dissolved ions since it is soluble in water. Water would be present in the solution as the solvent. If there was any excess nitric acid that was not completely neutralized, it would also be present in the beaker.

Learn more about strontium nitrate from the given link: https://brainly.com/question/22881954

#SPJ11

D. High pressure most likely describes the environment in which this rock formed.

The rock shown in the photograph is a type of sedimentary rock called "conglomerate." Conglomerate rocks are formed by the deposition and cementation of large, rounded fragments of pre-existing rocks. The rounded nature of the rock fragments suggests that they have undergone transport and erosion before being deposited and lithified into conglomerate.

The most likely environment for the formation of conglomerate rocks is a high-energy setting, such as river channels, where the rock fragments are subjected to high pressures during transport. The high pressure is a result of the weight and force of the moving water, which helps to compact and cement the rock fragments together.

The other options, such as low mineral content, low temperature, and high humidity, are not necessarily indicative of the environment in which conglomerate rocks are formed. Conglomerate formation is primarily associated with the physical processes of transportation and deposition, rather than the chemical composition, temperature, or humidity of the environment.

To learn more about conglomerate, here

https://brainly.com/question/7945792

#SPJ4

Answer:

Since the trials depend on the number of shakes, trials is the DEPENDENT VARIABLE and shakes is the INDEPENDENT VARIABLE as something depends on it.  

Independent is on the X axis

Dependent is on the Y axis

The answer to your question is D, either A or B. An electrochemical cell can be used for quantitative analysis, also known as "quant" analysis, to determine the concentration of an unknown analyte.

Both batteries and electrolytic cells can be used for this purpose, depending on the specific setup of the electrochemical cell. Therefore, the answer is that it could be either A or B.

An electrochemical cell used for the "Quant" purpose (that is, to find unknown concentration of the analyte) is based on: C. neither A nor B. It is actually based on a galvanic cell or a potentiometric cell, which measure the potential difference between two half-cells in order to determine the concentration of the analyte.

To know mor about electrolytic cell visit:

https://brainly.com/question/4030224

#SPJ11

Answer: D. Processing

Explanation: 100% on topic test also its in my e notes.

Craik and Lockhart has proposed theory of memory processing. Thus, option D is correct.

Craik and Lockhart proposed the theory for the processing of the level of memory. The memory in humans can be sensory memory, working memory, and long-term memory.

The long term memories have been stored in the deeper cells and the increased or strong stimulation of the processing results in the stronger retention of the memories. Thus, option D is correct.

For more information about the memory processing, refer to the link:

https://brainly.com/question/6249980

Answer:

1. It is stoichiometric.

2. O2 is the limiting reactant.

3. 9.0 g of C2H6 remain unreacted.

4. 17.6 g of CO2.

5. 85.2%.

Explanation:

Hello there!

In this case, for the given chemical reaction:

\(2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O\)

We can see that:

1. It is stoichiometric and is balanced because the reactants yields the products according to the law of conservation of mass.

2. In this part, it is possible to calculate the moles of ethane by using its molar mass:

\(n_{C_2H_6}=15g*\frac{1molC_2H_6}{30.08g} =0.50molC_2H_6\)

And the moles of oxygen by knowing that one mole is contained in 22.4 L at STP:

\(n_{O_2}=\frac{1mol}{22.4L} *15.68L=0.7molO_2\)

Thus, by calculating the moles of carbon dioxide product by each reactant, we can identify the limiting one:

\(n_{CO_2}^{by\ C_2H_6}=0.50molC_2H_6*\frac{4molCO_2}{2molC_2H_6} =1.0molCO_2\\\\n_{CO_2}^{by\ O_2}=0.70molO_2*\frac{4molCO_2}{7molO_2} =0.4molCO_2\\\)

Thus, since oxygen yields the fewest moles of CO2 product, we infer it is the limiting reactant.

3. In this part, we calculate the mass of C2H6 that actually react first:

\(m_{C_2H_6}^{reacted}=0.4molCO_2*\frac{2molC_2H_6}{4molCO_2}*\frac{30.08gC_2H_6}{1molC_2H_6} =6.0gC_2H_6\)

Thus, the leftover of ethane (C2H6) as the excess reactant is:

\(m_{C_2H_6 }^{leftover}=15g-6.0g=9.0g6.0C_2H_6\)

4. Since 0.4 moles of carbon dioxide were produced, we use its molar mass to calculate the mass as its theoretical yield:

\(m_{O_2}^{theoretical}=0.4molCO_2*\frac{44gCO_2}{1molCO_2}=17.6gCO_2\)

5. Finally, the percent yield is gotten by dividing the actual yield by the theoretical one:

\(Y=\frac{15g}{17.6}*100\%\\\\Y=85.2\%\)

Best regards!

Answer:

35

Explanation:

Given parameters:

  Atomic number of zinc  = 30

  Mass number of zinc = 65

Unknown

  Number of neutrons  = ?

Solution:

The mass number of an atom is the sum of its protons and neutrons;

     Mass number  = Protons + neutrons

Atomic number is the number of protons in an atom;

   Atomic number  = Protons

So;

     Mass number  = Atomic number + Neutrons

Neutrons  = Mass number  - Atomic number

 Neutrons  = 65 - 30  = 35

The number of neutrons in the atom is 35

Answer:

Electrons accelerated to high velocities travel in straight lines through an empty cathode ray tube and strike the glass wall of the tube, causing excited atoms to fluoresce or glow.

Explanation:

The limiting reactant for solid aluminum al and oxygen o2 gas react to form solid aluminum oxide al2o3. suppose you have 2.0 mol of al and 3.0 mol of o2 in a reaction is Al.

Read more about the solvent:

https://brainly.com/question/25326161

#SPJ4

The difference between an independent variable and a dependent variable is an independent variable is the variable that is manipulated by the experimenter, and a dependent variable is the variable that is measured to see if it is affected by the independent variable.

In statistics, an independent variable is a variable that is manipulated or controlled by the researcher to observe its effect on a dependent variable.

Learn more about independent variable at:

https://brainly.com/question/29430246

#SPJ1

The independent variable in an experiment is the factor that researchers deliberately change to test its effects, while the dependent variable is the factor that they measure to see if it changes in response to the manipulation of the independent variable.

The difference between an independent variable and a dependent variable is that an independent variable is a factor in an experiment that the researcher manipulatively changes to see if it has any effect, while a dependent variable is the factor the researcher measures to see if it changes as a result of the manipulation of the independent variable.

For example, if you were running an experiment to see if different amounts of sunlight affected the rate at which a plant grows, the independent variable would be the amount of sunlight the plant receives (because you, the researcher, are changing it), and the dependent variable would be the growth rate of the plant (because you are measuring this to see if it changes in response to the changing amount of sunlight).

https://brainly.com/question/38097299

#SPJ12

Answer: Use the formula x = (c ÷ V) × 100 to convert the concentration (c) and volume (V) of the final solution to a percentage. In the example, c = 60 ml and V = 350 ml.

Explanation: Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution.

The correct answer is 2.03×1/10² mol

500 cm³ = 0.5 L,760 mm of Hg=1 atm.

Now apply the ideal gas law, n= PV/RT

​n= 1×0.5/ 0.0821×300

⟹n=2.03×10 ^−2 mol

What is the ideal gas law?

To know more about ideal gas law, click the link given below:

https://brainly.com/question/28257995

#SPJ1

Answer:

1.4 moles/ 2.0 L= 0.7 M

Explanation: Molarity= moles of solute/ Liters of solution

therefore just plug the numbers in and you'll find the molarity to equal. 0.7

Answer:

B

Explanation:

Because , it is the answer .

Based on the information provided in the chart, the statement that is best supported is Atom X will donate electrons to Atom Y. Option A is the correct answer.

Atom X has 6 valence electrons, which means it has 6 electrons in its outermost energy level. Atom Y has 2 valence electrons, indicating that it has 2 electrons in its outermost energy level. In a chemical reaction, atoms tend to either donate or accept electrons to achieve a stable electron configuration. Option A is the correct answer.

Atom X has more valence electrons than Atom Y, suggesting that it is more likely to donate electrons. Since Atom Y has fewer valence electrons, it is more likely to accept electrons from Atom X. Therefore, based on the number of valence electrons, Atom X will donate electrons to Atom Y in order to achieve a stable electron configuration.

Learn more about Atom here:

https://brainly.com/question/17545314

#SPJ2

The decay constant (k) for the 226Ra isotope with a half-life of 1.6 x 10^3 years is approximately 4.33 x 10^-4 year^-1.

To calculate the decay constant (k) for the 226Ra isotope, we can use the formula: k = ln(2) / t1/2, where ln(2) represents the natural logarithm of 2 and t1/2 is the half-life.

In this case, the half-life of 226Ra is given as 1.6 x 10^3 years.

By substituting this value into the formula, we get: k = ln(2) / (1.6 x 10^3).

Evaluating this expression gives us a decay constant of approximately 4.33 x 10^-4 year^-1. This value indicates the rate at which the 226Ra isotope decays over time.

Learn more about decay constant here:

https://brainly.com/question/9712130

#SPJ11

(a) The reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol is spontaneous at 25°C.

(b) The reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol is not spontaneous at 25°C.

To determine whether a reaction is spontaneous at a given temperature, we can use the Gibbs free energy equation: Delta G = Delta H - T·Delta S, where Delta G is the change in Gibbs free energy, Delta H is the change in enthalpy, Delta S is the change in entropy, and T is the temperature in Kelvin.

For a reaction to be spontaneous, Delta G must be negative. If Delta H is negative (exothermic) and Delta S is positive (increase in disorder), the reaction is more likely to be spontaneous.

(a) For the reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol, we have Delta G = 12.6 kJ/mol - (25 + 273) K·(93 J/K·mol/1000 J/kJ) = -5.25 kJ/mol. Since Delta G is negative, the reaction is spontaneous at 25°C.

(b) For the reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol, we have Delta G = 9.5 kJ/mol - (25 + 273) K·(-94.0 J/K·mol/1000 J/kJ) = 3.57 kJ/mol. Since Delta G is positive, the reaction is not spontaneous at 25°C.

To determine the minimum temperature at which a non-spontaneous reaction becomes spontaneous, we can set Delta G equal to zero and solve for T in the equation Delta G = Delta H - T·Delta S. However, in this case, both reactions are either spontaneous or non-spontaneous at 25°C, so we do not need to calculate the minimum temperature.

To know more about Gibbs free energy refer here:

https://brainly.com/question/29753420#

#SPJ11

Answer:

volume in Liter = 2.50 L

Explanation:

Given:

Na2CO3 = 0.2 M

Molar mass of Na2CO3 = 106 g/mol

Mass of Na2CO3 solution = 53 gram

Find:

Volume of Na2CO3

Computation:

Number of mol of Na2CO3  = (53 g) / (1.06 x 10² g/mol)

Number of mol of Na2CO3  = 0.5 mol

M = Number of mol / volume in Liter

0.2 = 0.5/ volume in Liter

volume in Liter = 0.5 / 0.2

volume in Liter = 2.50 L

The increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

Equilibrium is a state where the presence of base and acid is in equal quantity.

Increased pH, leads to more acidity and reduces the number of ions.

Ions are necessary for corals, oysters, mussels, and many other shelled organisms that require building their shells and skeletons.

Thus, increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

Learn more about equilibrium

https://brainly.com/question/13463225

#SPJ1

The music group which demonstrates how they use sound technology when recording songs is foo fighters

Foo Fighters are formed in Seattle, Washington. They are group of music band who sings rock music. The band was formed in 1994 by a drummer, Dave Grohl.

The band has won so many awards which includes best rock album.

Therefore, Foo fighters is a music group which demonstrates how they use sound technology when recording songs.

Learn more about music:

https://brainly.com/question/17523475

a) Data:

F = 600 N

t = 1.5 s

The equation for Impulse:

Impulse = I = F x t,

then the change in momentum: pf - pi

Impulse and the change in momentum are related like this:

pf - pi = I = F x t = 600 N x 1.5 s = 900 N.s

Therefore the change in momentum: pf-pi = 900 N.s

b) Velocity (t) = initial velocity + a x t

We can assume initial velocity = 0 m/s

From F = m x a = mass x acceleration, we clear "a",

m = 275 g = 0.275 kg (1 kg = 1000 g)

Then, F/m = a => 600 N/0.275 kg = 2182 m/s^2

Velocity (t) = 0 + 2182 m/s^2 x 1.5 s = 3273 m/s

Velocity = 3273 m/s

Answer:

3 exothermic reaction. only that much

Hi,

These are the answers.

• Question 2. C , Substance dissolves

• Question 3. D , Exothermic reaction

• Question 4. C , Endothermic reaction takes place

• Question 5. A , the products formed has more energy than reactants

Hope it helps you... pls mark brainliest if it helped you

Answer:

To find the number of molecules of lithium chloride in 78.40 g, we need to first convert the mass to moles using the molar mass of lithium chloride:

moles = mass / molar mass

moles = 78.40 g / 42.39 g/mol

moles = 1.849 mol

Now we can use Avogadro's number to convert from moles to molecules:

molecules = moles x Avogadro's number

molecules = 1.849 mol x 6.022 x 10^23 molecules/mol

molecules = 1.111 x 10^24 molecules

Therefore, there are 1.111 x 10^24 molecules of lithium chloride in 78.40 g.

Explanation:

Answer:

24 atoms

3C8

3*8=24

28 atoms of carbons are there in 3 molecules of octane.

A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. A core nucleus surrounded by one or more negatively charged electrons makes up an atom.

Octane has an eight carbon atom straight chain alkane.

so, the three molecules of octane will have = 3 * 8 = 24 atoms.

Thus , 28 atoms of carbons are there in 3 molecules of octane.

To learn more about atoms, refer to the below link:

https://brainly.com/question/13933704

# SPJ2

Answer:

diselenium heptachloride

Explanation:

Se2Cl7

Se = selenium

Cl = chlorine

Don't forget the "-ide"

Diselenium heptachloride

The concentration of the diluted solution is equal to 0.072 times the concentration of the stock solution.

To determine the concentration of the diluted solution, we need to use the equation:

C1V1 = C2V2

Where:

C1 = concentration of the stock solution

V1 = volume of the stock solution

C2 = concentration of the diluted solution

V2 = volume of the diluted solution

In this case, we have:

C1 = concentration of the stock solution (unknown)

V1 = 18.0 mL (milliliters)

C2 = concentration of the diluted solution (unknown)

V2 = 0.250 L (liters)

Since the units need to be consistent, we should convert the volume of the stock solution to liters:

V1 = 18.0 mL = 18.0 mL * (1 L / 1000 mL) = 0.018 L

Plugging the values into the equation, we have:

C1 * 0.018 L = C2 * 0.250 L

Now we can solve for C2, the concentration of the diluted solution:

C2 = (C1 * 0.018 L) / (0.250 L)

Simplifying the equation, we get:

C2 = 0.072 C1

This means that the concentration of the diluted solution is equal to 0.072 times the concentration of the stock solution.

In summary, to find the concentration of the diluted solution, you would multiply the concentration of the stock solution by 0.072. However, since the concentration of the stock solution is not provided in the question, we cannot calculate the exact concentration of the diluted solution.

Know more about Concentration here:

https://brainly.com/question/17206790

#SPJ8

Answer:

The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.

Answer:

1. Endothermic

2. Exothermic

3. Exothermic

4. Endothermic

Explanation:

A P E X

In order to obtain more accurate results as well as to improve the efficiency of the laboratory procedure, the following recommendations are given:

Improving laboratory results can be achieved through several strategies aimed at enhancing experimental conditions, equipment, procedures, and data analysis.

Some possible methods for improving laboratory performance:

Learn more about lab procedures at: https://brainly.com/question/13517732

#SPJ1

Answer:

500K

Explanation:

We use Charle's law that states that at a constant pressure the volume of a given mass of a gas varies linearly with absolute temperature of the gas.

V ∝ T

V = kT

∴ k is the proportionality constant

v/T = as it a ratio between volume and temperature the value of k would be a constant quantity.

Therefore it can be written as:

v1 / T1 = V2 / T2

Now solving the question:

V1 = 600 torr

T1 = 300 K

V2 = 1000 torr

T2 = ?

600/300 = 1000/T2

T2= (1000 x 300)/600

T2= 500 K