4. When cerium sufate, Ce(SO4)3, is dissolved in water, energy is:?
A. absorbed
B. released
C. destroyed
D. created

Gaseous acetylene reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. The chemical equation of the reaction is \(2C_2H_2 (g) + 5O_2 (g)-- > 4CO_2 (g) + 2H_2O (g)\)

The chemical equation of a reaction is an expression that shows how the reactants combine to form the products using the chemical symbols for the components.

The reaction of gaseous acetylene with oxygen gas to form gaseous carbon dioxide and gaseous water can be analyzed and written as follows:

The chemical formula for gaseous acetylene = \(C_2H_2 (g)\)

The chemical formula for oxygen gas = \(O_2 (g)\)

The chemical formula for gaseous carbon dioxide = \(CO_2 (g)\)

The chemical formula for gaseous water = \(H_2O (g)\)

The overall equation for the chemical reaction with all the phases identified is then written as:

\(2C_2H_2 (g) + 5O_2 (g)-- > 4CO_2 (g) + 2H_2O (g)\)

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Gaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Answer:

0.043 grams

Explanation:

We can find the mass of carbon dioxide as follows:

\( m = n*M \)

Where:

n: is the number of moles

M: is the molar mass = 44.01 g/mol

First, we need to calculate the number of moles. We can use the Ideal gas equation:

\( PV = nRT \)

Where:

P: is the pressure = 0.945 atm

V: is the volume = 25.0 mL  

R: is the gas constant = 0.082 L*atm/(K*mol)

T: is the tempearture = 22.5 °C

\(n = \frac{PV}{RT} = \frac{0.945 atm*25 mL*\frac{1 L}{1000 mL}}{0.082 L*atm/K*mol*(22.5 + 273) K} = 9.75 \cdot 10^{-4} moles\)

Hence, the mass is:

\(m = 9.75 \cdot 10^{-4} moles*44.01 g/mol = 0.043 g\)

Therefore, 0.043 grams were collected.

I hope it helps you!

The statement "Superficial zone chondrocytes can get compacted under physiological loading: a multiscale finite element analysis" is true.

Superficial zone chondrocytes are the most exposed to mechanical loading and are therefore at risk of being compacted under physiological loading. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.

This means that chondrocytes in the superficial zone of cartilage are at risk of being compacted under the physiological loading that it experiences in everyday life. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.

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The volume of water needed to dilute the solution to obtain a 0.25 M NaCl solution is 75 mL

M₁V₁ = M₂V₂

1 × 25 = 0.250 × V₂

25 = 0.25 × V₂

Divide both side by 0.25

V₂ = 25 / 0.25

V₂ = 100 mL

Volume of water = V₂ – V₁

Volume of water = 100 – 25

Volume of water = 75 mL

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There are 6.13 moles of Ni in 360.0 grams.

1st) We need to know the atomic mass of Ni. We can find it in the Periodic Table of Elements.

Ni atomic mass: 58.69 g/mol

2nd) With a mathematical Rule of Three we can calculate the number of moles in 360.0 grams of Ni:

So, there are 6.13 moles in 360.0 grams of Ni.

Answer:

6.134 moles

Explanation:

Ni atomic mass is 58.6934 g/ mol so I divide 360 to this to get around 6.134

When a chocolate bar is solid, it is able to smell it.  It is also important to note that a substance 's molecules cannot be in two distinct phases at the a time.

In general, it is not possible for a the molecules of the chocolate  to be in two distinct phases at the same time.

It must be noted that smelling a solid, such as a chocolate bar, however, mean  the release  of loose molecules from the solid,   which may then move   through the air and   reach our olfactory receptors in our nose, allowing us to sense the fragrance.

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The mass of the solid aluminum that forms are 192.73 grams

To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.

The balanced chemical equation is:

3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al

The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.

To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:

Mass = Volume × Density

Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g

Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:

Moles of magnesium = Mass of magnesium / Molar mass of magnesium

= 260.7 g / 24.31 g/mol

= 10.72 mol

According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:

Moles of aluminum = (2/3) × Moles of magnesium

= (2/3) × 10.72 mol

= 7.15 mol

Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):

Mass of aluminum = Moles of aluminum × Molar mass of aluminum

= 7.15 mol × 26.98 g/mol

= 192.73 g

Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.

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Answer:

C. the boiling point of water

Explanation:

B is correct because boiling point only usually differs among the same substance when pressure changes. So say you take one solution onto a mountain top and another at sea level, the boiling point will not be the same, but here we assume they are in the same place so it won't.

A cannot be because the containers are all different shapes (and we aren't talking about like molecular shape of water from what I assume, we mean macroscopically, so that can't be).

B cannot be because we have 4 different temperatures.

D cannot be because we have 4 different temperatures, and therefore different amounts of steam will be released per minute as not all the waters have reached boiling.

The balanced chemical equation is AlI₃(s) + 3 K(s) → 3 KI(s) + Al(s). The number of moles of aluminium will be 2.437moles.

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Choking is a hazard for small children who have a tendency to put small objects in their mouths! Follow these tips to keep your child safe: Minimize The Risk.

Eden Michael Hazard, the captain of the Belgian national team, was born in Belgium on January 7, 1991. He plays as a winger or offensive midfielder for the Spanish club Real Madrid. Hazard, one of the best players of his generation, is renowned for his originality, dribbling, passing, and vision.

Hazard, a former footballer himself and the son of two former players, started out by playing for neighborhood youth teams in Belgium. He relocated to France in 2005, joining Ligue 1 team Lille to start his senior career. In November 2007, Hazard, then 16 years old, made his professional debut after spending two years in the club's youth. Under the leadership of manager Rudi Garcia, he was an essential member of the Lille team.

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To solve this we must be knowing each and every concept related to speed. Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.

Speed may be defined as the distance traveled by an item in the amount of time it requires to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.

The average speed is the total distance traveled by the item in a particular time frame. A scalar quantity is average speed. The magnitude of a scalar quantity indicates that it has no direction.

Mathematically,  

speed of light=2.998 x 10⁵m/s.

Time = (1.496x10⁸ km x 1000m/km) / (2.998 x  10⁵ m/s)

       =5x10⁵s

Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.

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Answer:

D.

Explanation:

The Molarity of solution if a 2.45M of sulphiric acid solution has a density of 1.15g/ml at 20degree celesius is 2.69M.

Given,

Density of the solution = 1.15 g/mL

Molarity of the sulphiric acid = 2.45M

Molar mass of sulphuric acid = 98 g

Density is given as:

\(Molarity(\frac{1}{molarity} +\frac{mol.wt}{1000} )\\\\=2.45(\frac{1}{molarity} + \frac{98}{1000} )\\\\(\frac{1}{molarity} = (\frac{1.15}{2.45} + \frac{98}{1000} \\\\(\frac{1}{molarity} = 0.469 - 0.098\\\\(\frac{1}{molarity} = 0.371\\\\Molarity = 2.69m\\\\\)

The Molarity of solution if a 2.45M of sulphiric acid solution has a density of 1.15g/ml at 20degree celesius is 2.69M.

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The term molefraction is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the molefraction is 1 / 5. The correct option are D, D and B.

Molefraction of any component of a solution is defined as the ratio of the number of moles of that component to the total number of moles of the solution. The sum of molefraction of solute and solvent is one.

Here the molefraction of nitrogen = Moles of nitrogen / Total number of moles

1. 'x' of 'N' = 2 / 5 + 3 + 2 = 0.2 or 1 / 5

2. Molefraction of Argon = 0.60 / 0.40 + 0.04 + 0.60 = 0.57

Partial pressure = Molefraction × Total pressure

0.57 × 6.3 = 3.59 atm

3. 20 cm³ mixture contains:

20 × 1 mole / 22400 m³ = 8.9286 × 10⁻⁴

1 mole occupies 22400 cm³

8.9286 × 10⁻⁴ × 22400 cm³ / 1 mole = 20 cm³

Thus the correct option are D, D and B.

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Answer:

The Henry's law constant for argon is \(k=2.11*10^{-3}\frac{ M}{atm}\)

Explanation:

Henry's Law indicates that the solubility of a gas in a liquid at a certain temperature is proportional to the partial pressure of the gas on the liquid.

C = k*P

where C is the solubility, P the partial pressure and k is the Henry constant.

So, being the concentration \(C=\frac{ngas}{V}\)  

where ngas is the number of moles of gas and V is the volume of the solution, you must calculate the number of moles ngas. This is determined by the Ideal Gas Law: P*V=n*R*T where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. So \(n=\frac{P*V}{R*T}\)

In this case:

Then:

\(n=\frac{1 atm*5.16*10^{-2} L}{0.082 \frac{atm*L}{mol*K} *298K}\)

Solving:

n= 2.11 *10⁻³ moles

So: \(C=\frac{ngas}{V}=\frac{2.11*10^{-3} moles}{1 L} =2.11*10^{-3} \frac{moles}{L}= 2.11*10^{-3} M\)

Using Henry's Law and being C=CAr and P =PAr:

2.11*10⁻³ M= k* 1 atm

Solving:

\(k=\frac{2.11*10^{-3} M}{1 atm}\)

You get:

\(k=2.11*10^{-3}\frac{ M}{atm}\)

The Henry's law constant for argon is \(k=2.11*10^{-3}\frac{ M}{atm}\)

The Henry's law constant for argon gas in 1 litre of water is 2.1 × 10⁻³M/atm.

Henry's law of gas states that solubility of a gas in any liquid at particular temperature is directly proportional to the partial pressure of the gas.

C∝P

C = kP, where

k = Henry's constant

P = partial pressure of gas

C is the solubility and it is present in the form of concentration and will be calculated as:
C = n/V

n = no. of moles

V = volume

And moles of the gas will be calculated by using the ideal gas equation as:

PV = nRT

n = (1)(5.16×10⁻²) / (0.082)(298) = 2.1 × 10⁻³ moles

And Concentration in liquid will be:

C = 2.1 × 10⁻³mol / 1L = 2.1 × 10⁻³ M

Now we put all these values in the first equation to calculate the value of k as:

k = (2.1 × 10⁻³M) / (1atm) = 2.1 × 10⁻³M/atm

Hence required value of k is 2.1 × 10⁻³M/atm.

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Answer:

Explanation:

The equation must be balanced on both sides to show the law of conservation of mass. So, as long as it is equaled, the law is shown.

The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.

The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.

Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.

Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.

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There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, Strontium belongs to group 2, alkaline earth metal family of the periodic table.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Strontium is the element having 38 protons and 50 neutrons.

mass number= proton number + neutron number

                      =38+ 50

                     =88

Group number of this element is group 2. Strontium belongs to akaline earth metal family.

Therefore, Strontium belongs to group 2, alkaline earth metal family of the periodic table.

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Answer:

C. The ml quantum number must have a positive value.

Explanation:

The single electron in hydrogen can be found in a ground state orbital of 1s having a magnetic quantum number ml = 0.

Similarly, this one electron can be excited to other higher energy levels such as 2p, 3p, 3d etc

The magnetic quantum numbers ml for higher np sub-levels of the hydrogen atom have magnetic quantum numbers; -1, 0 and 1.

The nd sub-levels have magnetic quantum numbers; -2, -1, 0, 1, 2. We can see from the foregoing that magnetic quantum number ml for hydrogen atom is not always positive.

Explanation:

Alkali metal refers to group1 elements.

Alkali earth metal refers to group 2 elements.

Non metals refers to elements in grouos 4 to group 7.

Halogen refers to group 17 elements

Transition Metal refers to group 3 to group 12 elements

Noble gases refer to elements in group 18.

To obtain the group number from the electronic configuration, we calculate the total number of electrons in the principal quantum number (coefficient of the letters).

a. [Ne]3s1

Principal quantum number = 3

Number of electrons present = 1

This element belongs to group 1. It is an Alkali Metal.

b. [Ne]3s23p3

Principal quantum number = 3

Number of electrons present = 2 + 3 = 5

This element belongs to group 15 (5A). It is a Non metal

c. [Ar]4s23d104p5

Principal quantum number = 4

Number of electrons present = 2 + 5 = 7

This element belongs to group 17 (7A). It is an Halogen.

d. [Kr]5s24d1

This configuration belongs to the element yttrium and has an incomplete d shell. Hence it is a transition metal.

e. [Kr]5s24d105p6

Principal quantum number = 5

Number of electrons present = 2 + 6 = 8

This element belongs to group 18 (8A). It is a Noble gas.

A homogenous mixture varies from a heterogenous mixture in that a homogenous mixture has properties that do not vary in the mixture. The correct answer is A.

A homogeneous mixture is a mixture in which the properties and composition are uniform throughout the mixture. This means that if you took a sample from any part of the mixture, you would find the same properties and composition in that sample as you would find in the entire mixture.

In contrast, a heterogeneous mixture is a mixture in which the properties and composition vary throughout the mixture. For example, a salad is a heterogeneous mixture because you can see different ingredients such as lettuce, tomatoes, and croutons, each with different properties and composition.

So, in a homogeneous mixture, the properties do not vary, while in a heterogeneous mixture, the properties vary throughout the mixture.

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Explanation

Given

Mass of Calcium = 15.0 g

we know the molar mass of Ca = 40,078 g/mol, CaO = 56,0774 g/mol

Solution

Step 1: Fine the moles of Ca

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 15.0g/40.078g/mol

n = 0.374 mol

Step 2: Use stoichiometry to find the moles of CaO

The molar ratio between Ca and CaO is 2:2

Therefore the number of moles of CaO = 0.374 mol

Step 4: Find the theoretical mass of CaO

m = n x M

m = 0.374 mol x 56,0774 g/mol

m = 6.674x10^-3 g

%yield = (actual yield/theoretical yield) x 100

0.77 = actual yield/6.674x10^-3

Actual yield = 5.14x10^-3 g

Answer

Mass of CaO = 5.14x10^-3 g

Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

A compound is a substance shaped when at least two synthetic components are synthetically fortified together. The kind of bonds keeping components intact in a compound can fluctuate: two normal sorts are covalent bonds and ionic bonds. The components in any compound are consistently present in fixed proportions.

A compound generally has similar components to similar extents. For instance, carbon dioxide generally has two particles of oxygen for every molecule of carbon, and water generally has two atoms of hydrogen for every molecule of oxygen. A compound generally has a similar structure all through. All compounds are particles, yet not all atoms are compounds. That is on the grounds that a particle can be comprised of two atoms of a similar kind, as when two oxygen atoms tie together to make an oxygen atom. Notwithstanding, all compounds are comprised of at least two unique kinds of particles.

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Answer:

NaOH is the limiting reactant.

Explanation:

Hello there!

In this case, since the reaction taking place between sodium hydroxide and chlorine has is:

\(NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\)

Which must be balanced according to the law of conservation of mass:

\(2NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\)

Whereas there is a 2:1 mole ratio of NaOH to Cl2, which means that the moles of the former that are consumed by 0.85 moles of the latter are:

\(n_{NaOH}=0.85molCl_2*\frac{2molNaOH}{1molCl_2}\\\\n_{ NaOH}=1.7molNaOH\)

Therefore, since we just have 1.23 moles out of 1.70 moles of NaOH, we infer this is the limiting reactant.

Regards!

The cobalt with a half life of 5.3  years have the decay constant of 0.13 yrs⁻¹ . After 10.46  years 25.7 % of cobalt -60 will be there.

Heavy unstable radioactive isotopes undergo nuclear decay by the emission of charged particles. Nuclear decay is a first order reaction.

Thus, the decay constant k  = 1/t ln W0/Wt

where t is the time of decay, W0 be the initial amount and Wt be the amount after time t.

The half life of the element =  5.3 years

k = 0.693/5.3yrs =  0.13 yrs⁻¹.

The time of decay is given 10.6 years.

Then,

t = 1/k  ln Wo/(Wt )

10.6 = ln(100/wt)/ 0.13 yrs⁻¹

(100/wt) = ln (10.6×0.13)

      Wt  = 25.7 %.  

Therefore, 25.7 % cobalt -60 sample will remain after 10.6 years.

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Answer:

option C 5

hope this answer helps you dear! take care

Answer:

5, the coefficient is the number right before the variable. The ² and ³ (even though Mines on top and yours is on the bottom) are not coefficient because. . . well it just doesn't make sense.

Answer:

Uranium

Explanation:

Answer:

N2 + H20

Explanation:

chemical equation balancer

Answer:

Option B, \(H3PO4 + H2O <==> H3O^+ + H2PO4^-\)

Explanation:

In this reaction, a weak acid is reacting with  water. Thus, water is this case will act as a proton acceptor or a base as well as an acid. Hence water will be amphiprotic for this chemical process and can donate as well accept as a proton. Now when weak acid such as phosphoric acid loses a hydrogen ion it forms a weak conjugate base ie. H2PO4^-. Water being a weak base shall accept the proton and forms hydronium ion i.e H3O^+

The dihydrogen phosphate ion reacts with water:

H2PO4^- + H2O <----> HPO4^2- + H3O^+

After some time a proton is again transferred to the H2O molecule to produce  phosphate ion

HPO4^2- + H2O <----> H3O^+ + PO4^3-