Calculate the volume in ) of 0.100 M Na2CO3 needed to produce 1.00 g of CaCO 3 (s) . There is an excess of CaCl 2. What’s the volume of sodium carbonate?

Answer:

Explanation:

Aniline is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine.

Answer:

1. Mechanical energy

2. Thermal energy

3. electric energy to mechanical energy

4. electrical energy to light

5. electric energy into sound energy and radiant energy

Explanation:

The enthalpy of combustion for 1kg of urea is -1223525.84 J/mol.

Urea is a compound that is used in fertilizers and in some plastics.The enthalpy of combustion for urea is the amount of energy that is released when urea is burned. In order to calculate the enthalpy of combustion for 1kg of urea, we need to use the information that is provided to us in the question. Let us start by writing down the balanced equation for the combustion of urea: CO(NH2)2 + 3/2 O2 → CO2 + 2H2O + N2
The balanced equation shows that 1 mole of urea reacts with 1.5 moles of oxygen gas to produce 1 mole of carbon dioxide, 2 moles of water, and 1 mole of nitrogen gas. The enthalpy change for this reaction is equal to the amount of energy that is released when 1 mole of urea is burned.
The heat of combustion (ΔHc) of urea is -632.6 kJ/mol. This means that 632.6 kJ of energy is released when 1 mole of urea is burned. We know that 12g of urea raised the temperature of water by 30°C. We can use this information to calculate the amount of energy that was released when 12g of urea was burned.
The specific heat capacity of water is 4.18 J/g°C. This means that it takes 4.18 J of energy to raise the temperature of 1 gram of water by 1°C. Therefore, it takes 4.18 x 1000 = 4180 J of energy to raise the temperature of 1 kg of water by 1°C.
We know that 12g of urea raised the temperature of water by 30°C. Therefore, the amount of energy that was released when 12g of urea was burned is:
Energy = mass x specific heat capacity x temperature change
Energy = 0.012 kg x 4180 J/kg°C x 30°C
Energy = 1497.6 J
We can now use this information to calculate the enthalpy of combustion for 1kg of urea:
Enthalpy of combustion = energy released / moles of urea burned
Enthalpy of combustion = 1497.6 J / (0.012 kg / 60.06 g/mol)
Enthalpy of combustion = - 1223525.84 J/mol
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Answer: Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

The correct statement about the combustion of glucose with oxygen to form water and carbon dioxide is The entropy of the products is greater than the entropy of the reactants.

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant.

A familiar example of a combustion reaction is a lighted match. When a match is struck along the match box, friction heats the head of the match to a temperature at which the chemicals react and then generate more heat which can escape into the air, and they burn with a flame after reacting with the oxygen.

In the above given question we can see that when combustion reaction of glucose takes place we can see that it produces water and along with that we can also see that carbon dioxide gas is also been released. In the reactant side we can see that there are no gaseous molecules present but we can see that in the product side there are gaseous molecules present, which suggests that randomness of the system is increased.

Hence the entropy of the products would be greater than the reactants.

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The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.

The  combustion reaction is given as :

C₆H₁₂O₆   +   6O₂    ---->   6CO₂    +   6H₂O

The large molecule that is glucose is converted into the small small molecules water and the carbon dioxide. this is the reason the entropy of the product side is greater than the entropy ( the disorder )of the reactants .

Thus, The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.

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The sand absorbed869,034.8 Joules of energy from the sun to raise its temperature from 14°C to 31°C.

To calculate the energy absorbed by the sand, we can use the formula:

Q = m * C * ΔT

where:

Given:

Mass of the sand (m) = 58.2 kg = 58,200 g (since 1 kg = 1000 g)

Specific heat capacity of the sand (C) = 0.742 J/g°C

Change in temperature of the sand (ΔT) = 31°C - 14°C = 17°C

Plugging in the values into the formula:

Q = 58,200 g * 0.742 J/g°C * 17°C

Q = 869,034.8 J

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Answer:

Water filters remove elements that cause drinking water to have an unpleasant taste and smell, such as lead, chlorine and bacteria. Home water filtration system will improve the overall purity, taste and smell of your drinking water. It also lowers the pH level of the water that you drink.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

The hair color of a person

Explanation:

The correct answer would be the hair color of a person.

Qualitative data are data that cannot be measured with any instrument but can only be used to characterize. Unlike quantitative data, these kinds of data can only be observed and recorded but cannot be assigned numerical values, except if coded.

The sound of a person's voice can be quantitative on one hand and qualitative on the other. The intensity of a sound can be measured using a decibel meter and quantitatively assigned a figure, whereas, the quality of the sound can only be characterized and not measured.

Both the weight and the body temperature of a person can be measured using a weighing balance and a thermometer respectively and hence, are considered to be quantitative data when collected.

The color of the hair of a person cannot be measured but can only be observed and characterized. Hence, hair color data constitute qualitative data.

Answer:

hair color

Explanation:

Ionic radii are a measure of the size of ions, which are atoms or molecules that have gained or lost electrons and therefore have a net electric charge. The ionic radii of elements within a group or a period can show certain trends due to the properties of the elements and the way in which their electron configurations change.

Within a group:

Within a group, ionic radii tend to increase as you go down the group. This is because elements in the same group have the same number of valence electrons (the electrons in the outermost energy level of an atom), but as you go down the group, the number of energy levels (shells) increases. This means that the outermost electrons are farther away from the nucleus, which leads to a larger atomic radius. When an atom loses or gains an electron to become an ion, the ionic radius will be similar to the atomic radius, so the ionic radii of elements within a group will also increase as you go down the group.

Across a period:

Across a period, ionic radii tend to decrease as you go from left to right. This is because elements in the same period have the same number of shells, but as you go from left to right, the number of protons (and therefore the atomic number) increases. This increases the positive charge of the nucleus, which attracts the electrons more strongly. As a result, the electrons are held closer to the nucleus, leading to a smaller atomic radius. When an atom loses or gains an electron to become an ion, the ionic radius will be similar to the atomic radius, so the ionic radii of elements across a period will also decrease as you go from left to right.

It is important to note that these trends are not always absolute and there can be some exceptions due to other factors such as electron shielding and the electron configurations of the elements.

There are several explanations for the trends in ionic radii within groups and across periods in the periodic table:

Overall, these trends in ionic radii can be explained by the interplay between the atomic size, effective nuclear charge, and the number of valence electrons of the elements.

Answer: The coefficient for water after the equation is balanced is 2.

Explanation:

The balanced chemical equation must have same charge and same number of atoms on both sides of the equation.

As the given reaction is a redox recation occuring in acidic medium.

\(HNO_3+3Fe^{2+}+3H^+\rightarrow NO+3Fe^{3+}+2H_2O\)

The coefficient for water will be 2 after the equation is balanced.

A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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To go from moles to grams, we must divide the given grams by the molar mass of the element. The molar mass of aluminum Al is 26.98g/mol. So the moles of Al will be:

Answer: 100 grams Al are equal to 3.71 moles of Al

We have already been introduced to solutions. Several chapters ago molarity (M) was introduced. Molarity is measured in moles per liter, or mol/L. A 0.30 M NaCl solution means that there is 0.30 mol NaCl in every liter of solution.

Often chemists have to make solutions; so, doing the calculations necessary to make a certain amount of solution become second nature.

For example:

Make 250 mL of a 0.30 M NaCl solution.

To make the solution we need to calculate the amount of NaCl to dissolve to make 250 mL of solution.

start with 250 mL

The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up to the line on the volumetric flask.

But molarity is not the only unit we use; so, we need to be able to convert between different units...

Common units of concentration include

<==> <==><==>

% wt.

% vol

molarity (M)

molality (m)

mol fraction

That is, the mol fraction of "a" is the number of moles of "a" present divided by the total number of moles of material in the solution (including the solvent).

There is no simple formula for converting from one concentration unit to the next. In general the first step is to pick a convenient sample size. Then work to change each part of the concentration unit to the new unit. Do not try to do the conversion all at once.

For example,

HCl comes in bottles marked 37 % HCl by weight. The density of the solution is 1.200 g/cm-1. What is the molarity of the solution?

A conveneint sample size is 100 g of solution; convenient because 100 g x 37% = 37 g HCl.

This is the key...you must know the definitions for all the concentration terms

First, convert number of grams of HCl in your sample to number of moles in your sample (the 100 g of solution).

Second, convert g of solution to L of solution.

Third, divide moles by liters and you have molarity.

What is the molality of this solution?

Going from M to m. Since the concentration is in M a convenient sample size is 1 L.

OK, so the first conversion is not a conversion...there are 12 mol HCl present in 1 L of solution.

The second conversion is not as easy as it first appears. Let's use the density of the solution to perform a conversion from volume to mass.

This is NOT the mass that is used in molality. We just determined the mass of the solution; molality uses the mass of the SOLVENT!

The solution is made of a solvent and a solute. So, the mass of solvent can be found by subtracting the mass of the solute from the mass of the solution.

Algal blooms and high concentrations of nitrogen in water are effects of water pollution. Overgrazing and the use of chemical fertilizers cause water pollution.

Algal blooms are an effect of water pollution. They occur when there is an excessive amount of nutrients, particularly nitrogen and phosphorus, in the water due to pollution. The overgrowth of algae depletes the oxygen levels in the water, which can harm fish and other aquatic animals.

Overgrazing can cause water pollution by increasing the sedimentation rate of waterways. This sedimentation can carry nutrients, bacteria, and other pollutants into the water, which can degrade water quality and cause harm to aquatic life.

The use of chemical fertilizers to enhance production is a cause of water pollution. When fertilizer is overused, it can leach into waterways and cause nutrient pollution, which can lead to algal blooms and other forms of water pollution.

High concentrations of nitrogen in water are often an effect of water pollution. This can be caused by the overuse of fertilizers or the discharge of untreated sewage into waterways. High nitrogen levels can cause algal blooms, which can lead to oxygen depletion and harm aquatic life.

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Answer:

Cause:

: : use of chemical fertilizers to enhance production

: : overgrazing

Effect:

: : high concentration of nitrogen in water

: : algal blooms

Hope this helps ;)

250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer:

1.092

Explanation:

Density = 1.0192 g/mL

oecific gravity = ?

Specific gravity is the ratio of a material's density with that of water.

The density of water at 4 degrees Celsius =  1 g/mL

Specific gravity = 1.0192 / 1 = 1.0192

Because specific gravity is a ratio, it has no dimension.

The specific heat capacity of the zinc metal, given that 2.40×10¹ g of zinc metal at 2.10×10¹ °C is added to the water is 0.27 J/gºC

First, we shall obtain the heat absorbed by the water when the zinc metal was added. This is shown below:

Q = MCΔT

= 5.60×10¹ × 4.184 × -2.1

= -492.0384 J

Now, we shall determine the specific heat capacity of the zinc metal. Details below:

Q = MCΔT

492.0384 = 2.40×10¹ × C × 76

492.0384 = 1824 × C

Divide both sides by 1824

C = 492.0384 / 1824

= 0.27 J/gºC

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Answer:

heres your answer

To determine whether a bond is Covalent or Ionic, you must know the difference in electronegativity (a fancy word for describing how good a job a particular element does at attracting new electrons).

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 2.7 g/mL

volume = 11 mL

The mass is

mass = 2.7 × 11

We have the final answer as

Hope this helps you

As a result, 2.75 moles of KCLO3 are needed.

Divide the mass by the molar mass (122.6g/mole) of KClO3 to get the moles, which is 0.626. To determine the amount of O2 produced, multiply that by the molar ratio: (0.062) x (3/2) = 0.939 moles of oxygen.

The balanced chemical equation for KClO3's breakdown is:

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

The equation states that 3 moles of O2 are created for every 2 moles of KClO3 that break down. Thus, we can apply a ratio to determine how much O2 is generated from 2.75 moles of KClO3:

(3 mol O2 / 2 mol KClO3) x 2.75 mol KClO3

= 4.125 mol O2

Now, we may convert moles to grammes using the molar mass of oxygen:

4.125 mol O2 x 32.00 g/mol

= 132 g O2

Therefore, 2.75 moles of KClO3 will produce 132 grams of O2.

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To calculate the molar mass of a compound, we first need to get the molar masses of the elements on the compond.

We can check thouse on a periodic table. In this case, we have the atoms Ca, N and O, so:

The molar mass of the compound will be the sum of the molar mass of the elements multiplied by the amount of thouse elements are in the compound.

The parenthesis in the formula of Ca(NO₃)₂ means that there are two groups of NO₃, so there are 1 atom of Ca, 2 atoms of N and 6 atoms of O, thus, the molar mass is:

As we can see, this corresponds to alternative C.

When we convert 11.4 g/cm³ to lb/ft³, the result obtained is 707.92 lb/ft³

454.55 g/cm³ = lb/cm³

Therefore,

11.4 g/cm³ = 11.4 / 454.55

11.4 g/cm³ = 0.025 lb/cm³

1 ft = 12 in

1 in = 2.54 cm

Thus,

12 in = 12 × 2.54

12 in = 30.48 cm

We can say

1 ft = 30.48 cm

Therefore,

1 ft³ = 30.48³ = 28316.84 cm³

Now, we can convert 0.025 lb/cm³ to lb/ft³ as follow:

(1/28316.85) lb/cm³ = 1 lb/ft³

0.025 lb/cm³ = 0.025 ÷ (1/28316.85) =  0.025 × 28316.85

0.025 lb/cm³ = 707.92 lb/ft³

Thus,

11.4 g/cm³ = 707.92 lb/ft³

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a. To ensure that the acid hydrolysis of an ester proceeds to completion, an excess of dilute hydrochloric (or sulfuric) acid is utilized.

Esters require an acid catalyst to hydrolyze since they are typically less reactive than carboxylic acids.

To ensure that there are enough acid molecules to interact with every ester molecule and cause complete hydrolysis, there is an excess of acid.

b. The equation for the acid hydrolysis of methyl propanoate is:

CH3CH2COOCH3 + H2O ⇌ CH3CH2COOH + CH3OH

The products are propanoic acid and methanol.

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Answer:

The answer is D)They have the same charge but different masses.

The number of neutrons in a nucleus affects the mass of the atom but not its chemical properties. Thus, a nucleus with six protons and six neutrons will have the ...

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Answer: D

Explanation:just did it

Answer

Explanation

The partial pressure (P) of can be calculated using ideal gas equation: PV = nRT.

Answer:

3.01×10²³ molecules.

Explanation:

From the question given above, the following data were obtained:

Mass of water, H₂O = 9 g

Molecules of water, H₂O =?

From Avogadro's hypothesis,

1 mole = 6.02×10²³ molecules

Next, we shall determine the mass of 1 mole of water, H₂O.

1 mole of water, H₂O = (1×2) + 16 = 18 g

Thus,

18 g of water, H₂O = 6.02×10²³ molecules

Finally, we shall determine the number of molecules in 9 g of water, H₂O. This can be obtained as follow:

18 g = 6.02×10²³ molecules

Therefore,

9 g = 9 g × 6.02×10²³ molecules / 18 g

9 g = 3.01×10²³ molecules

Thus, 9 g of water, H₂O contains 3.01×10²³ molecules.

Answer:

2.65 M

Explanation:

Convert grams of K₂CO₃ to moles.  The molar mass is 138.205 g/mol.

(110 g)/(138.205 g/mol) = 0.796 mol

Convert milliliters of solution to liters.

300 mL = 0.300 L

Divide moles of K₂CO₃ by liters of solution.

0.796 mol/0.300 L = 2.65 mol/L = 0.265 M

Answer:

2.7 M

Explanation:

M=moles of solute/volume of solution (L)

First, you need to calculate the number of moles using the given mass and the molar mass.

110 g138.205 g/mol=0.80 mol

Then, you can solve for molarity using the molarity equation.

M=0.80 mol0.300 L=2.7 M

Remember, you need to convert mL to L before you can calculate molarity.

The balanced chemical equations of the reactions are given below:

1. Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

2. 2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

A balanced chemical equation is an equation in which the number of moles of atoms of elements in a given reaction is equal to the sum of the number of moles of atoms of each element that is produced.

A balanced chemical equation is in accordance with the law of conservation of mass which states that matter can neither be created nor destroyed.

When balancing chemical equations, numerical coefficients are added in front of moles of atoms of an element or moles of a given compound taking part in the reaction.

The balanced chemical equation of the reaction of magnesium and water as well as the reaction of lithium and water is given below:

Magnesium and water:

Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

Lithium and water:

2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

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