a. Use the following data to calculate the enthalpy of hydration for calcium chloride and calcium iodide.
Lattice Energy* ΔHsoln
CaCl_2(s) -2247 kJ/mol -46 kJ/mol
CaI_2(s) -2059 kJ/mol -104 kJ/mol
*Lattice energy is defined as the energy change for the process M^+(g) + X^-(g) -------> MX(s).
b. Based on your answers to part a, which ion, Cl^- or I^-, is more strongly attracted to water?
O Chloride
O Iodide

The equilibrium constant for the system at this temperature is\(1.17 × 10^-31 mol^2/L^2\).

For the chemical equation:

N2(g) + O2(g) ⇌ 2NO(g)

The equilibrium mixture at a temperature of 1500 K is determined to contain 6.4 × 10^-3 mol/L of N2,\(1.7 × 10^-3\)mol/L of O2 and 1.1 × 10^-5 mol/L of NO.  First, we need to calculate the concentration of N2 and O2 required to produce

1.1 × 10^-5 mol/L of NO:

2NO(g) = N2(g) + O2(g)

Given that there are 1.1 × 10^-5 mol/L of NO, the number of moles of N2 and O2 are equal since the stoichiometric ratio is 1:1. Therefore:

\(1.1 × 10^-5 mol/L\) = [N2][O2]Kc = \(([NO]^2)/([N2][O2])Kc\)= \((1.1 × 10^-5 mol/L)^2/(6.4 × 10^-3 mol/L)(1.7 × 10^-3 mol/L)Kc\) =

1.17 × 10^-31 mol^2/L^2.

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Answer:

Aluminium, Thorium, Barium and Strontium. Nonmetals will be : Fluorine, Phosphorus and Krypton. Metalloids will be : Gallium and Tellurium.

Explanation:

To solve this question, we need to know the Avogadro's constant:

6.022 x 10^23 atoms equal 1 mol.

So, in this case we have 3.01x10^23

We first transform it to moles and then to grams, using the following formula:

m = n*MM

where:

m = mass

n = moles

MM = molar mass of silver nitrate (AgNO3) = 169.87 g/mol

6.022 x 10^23 ---- 1 mol

3.01x10^23 ---- x mol

x = 0.5 moles

m = 0.5 * 169.87 g/mol

m = 85 g

Answer: 85 g

Answer:

The answer is A. an unbalanced force

Explanation:

This is because the force from the hammer on the nail causes a force that unbalanced  normal forces on the nail.

Answer:

The answer is 0.0931 × 10^5

Hope this helps.

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

36 electrons

Explanation:

The # of protons is always equal to the atomic number. In the case of Sr (Strontium), it is 38 protons.

The 2+ at the end means that it has a charge of +2, meaning that it LOST two electrons to become a cation with a full valence shell. So, 38 - 2 = 36 electrons

Answer:

38 protons 36 electrons 30 neutron because of 29 isotope

Complete Question

A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL

-What is the volume of the pycnometer (mL)

We have that the volume of the pycnometer in mL is

\(V=9.111mL\)

From the Question we are told that

Pycnometer mass of \(m_p=27.056 g.\)

Temperature \(T=25 \textdegree\)

Pycnometer filled with distilled water \(m_{pf}= 36.773 g\)

Apparatus weighed \(w=41.451 g\)

Density of water \(\rho= 0.99704 g/mL\)

Generally the equation for Density  is mathematically given as

\(\rho=\frac{mass}{Volume}\)

Since pycnometer is filled with water its volume can be defined by the volume of water in it

Therefore

Mass of water Pycnometer filled with distilled water-Pycnometer mass

\(M_w=36.773 -27.056\\\\M_w=9.084g\)

Hence

\(V=\frac{9.084g}{0.99704 }\)

\(V=9.111mL\)

in conclusion

The volume of the Pycnometer in mL is

\(V=9.111mL\)

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Answer:

Transcription is when you make a copy of the RNA from DNA. This is how the mRNA can leave the nucleus which exists to the cytoplasm and into ribosomes where protein synthesis occurs. Translation is what happens after transcription and this is where protein synthesis occusrs in the ribosomes/endoplasmic reticulum.

Explanation:

The empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

We can determine the components of a chemical compound by looking at its formula. We can determine the precise number of atoms in a compound's molecule using its molecular formula. The ratio of these components is provided by the empirical formula. It is the compound's molecular formula scaled down to its lowest integer ratio.

Empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

To determine the emperical formula:

Step1: Determine the masses.

Step 2: Multiply the grams by the atomic mass to get the number of moles.

Step 3: Subtract the least number of moles from the total number of moles of each element.

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Answer:

Explanation:

1.1 we have to find mass of Na3PO4;

for that we have to Calculate the moles of Na3PO4 needed:

volume is 100mL = 0.1L

Molar concentration = Moles of solute / Volume of solution in L

0.1 mol/L = Moles of Na3PO4 / 0.1 L

Moles of Na3PO4 = 0.1 mol/L * 0.1 L

Moles of Na3PO4 = 0.01 mol

Now, Calculate the mass of Na3PO4 needed:

so, Mass = Moles of Na3PO4 * Molar mass of Na3PO4

Mass = 0.01 mol * 164 g/mol

Mass = 1.64 g of Na3PO4.

1.2 materials and glassware needed:

1.64 g Sodium phosphate (Na3PO4)

100 mL volumetric flask

weighing balance

Distilled water

Glass rod

Pipette and burette

\(density = \frac{mass}{volume} \)

\(d = \frac{25.7}{22.6} = 1.13717 \: g/ml\)

\(pay \: attention \: to \: the \: unit \: used \: to \\ express \: the \: density \\ since \: the \: mass \: is \: given \: in \: grams \\ and \: volume \: in \: milliliter \: then \\ the \: density \: is \: expressed \: in \\ grams \: per \: \: milliliter\)

The chemist added 6.44 g of sodium nitrate to the reaction flask by adding 215.0 mL of a 3.0 mol/L sodium nitrate solution.

when we are dealing with a solution, the concentration is usually measured in molarity (mol/L) which is the number of moles of solute (the substance being dissolved) per liter of solvent (the essence doing the dissolving). In this case, the solution is 3.0 mol/L, which means there are 3.0 moles of sodium nitrate in every liter of solution.

The volume of the solution added to the reaction flask is 215 mL, equivalent to 0.215 L.

By multiplying the concentration (3.0 mol/L) by the volume (0.215 L) we get the number of moles of solute in the solution.

In this case, 3.0 x 0.215 = 0.645 moles of sodium nitrate

The molar mass of sodium nitrate is 84.99 g/mol, which is the mass of one mole of the substance. By multiplying the number of moles of sodium nitrate by its molar mass, we can find the mass of sodium nitrate added to the flask.

0.645 moles x 84.99 g/mol = 54.79 g.

So, in summary, the chemist added 6.44 g of sodium nitrate to the reaction flask by adding 215.0 mL of a 3.0 mol/L sodium nitrate solution.

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Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force; thus the statement is True

The law of inertia is also known as Newton's first law of motion.

The law of inertia states that a body at rest or that is moving at constant or uniform motion along a straight line will remain in its state of rest or motion or uniform motion along a straight line unless acted upon by an external force.

The law of inertia explains why it s difficult to start an object moving or to stop a moving object.

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Answer:

d. There are two moles of hydroxide for each mole of these compounds.

Explanation:

calcium hydroxide, strontium hydroxide, and barium hydroxide all have two hydroxide compunds. the difference between each of these compounds is they all contain a different element along with hydroxide.

Answer: cutting, bending, dissolving, freezing, boiling, and melting.

Explanation:

Answer:

Explanation:

The most significant difference between the static and current electricity is that in static electricity the charges are at rest and they are accumulating on the surface of the insulator. Whereas in current electricity the electrons are moving inside the conductor.

To convert grams (g) of a substance to moles (mol), you need to divide the mass by the molar mass of the substance.

The molar mass of Be(NO2)2 can be calculated by adding the molar masses of its constituent atoms, which are:

The molar mass of Be: 9.01 g/mol

The molar mass of N: 14.01 g/mol

The molar mass of O: 16.00 g/mol (there are two oxygen atoms in the nitrite ion, NO2-)

So the molar mass of Be(NO2)2 is:

9.01 g/mol (Be) + 2(14.01 g/mol (N) + 2(16.00 g/mol (O)) = 9.01 g/mol + 28.02 g/mol + 32.00 g/mol = 69.03 g/mol

Now we can use this molar mass to convert 11.9 g of Be(NO2)2 to moles:

moles = mass/molar mass

moles = 11.9 g / 69.03 g/mol

moles ≈ 0.1727 mol

Therefore, 11.9 g of Be(NO2)2 is equivalent to approximately 0.1727 moles.

Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.

Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.

Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.

Ionic compounds are formed by anions and cations.

• Cations are positive ions derivated from metals.

• Anions are negative ions derivated from non-metals.

The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.

Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.

Covalent bonds are usually formed between non-metal atoms.

Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms

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Complete question

A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.

Which of the following characteristics can be written only in space C?

On the diagram,

Options,

Answer:

It affects the amount of a species that may be hunted by said predator, controlled you can say.

It can cause evolution in prey that causes them to not be caught, Darwins theory in a way.

Explanation:

Explanation:

At the level of the community, predation reduces the number of individuals in the prey population. The best example of predation involve carnivorous interactions, in which one animal consumes another, Think of wolves hunting moose, owls hunting mice, or shrews hunting worms and insects.

Answer:

Science is:

objective

based on fact

must be ethical

Explanation:

Science is considered to be objective because it is based on empirical evidence and systematic observation, and it strives to eliminate personal bias and opinions from the scientific process. Science is based on fact, as it relies on repeatable and verifiable experiments to test hypotheses and theories. And, it is important for science to be ethical because the scientific community has a responsibility to ensure that research is conducted in an ethical and responsible manner, and that the results are reported accurately and honestly.

Answer:

20 kg/m3

Explanation:

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: B

Explanation: im pretty sure my teacher mentioned something about N--h bonds are non polar

Answer:

C

Explanation:

Answer:

The atomic masses of 'He' and 'Ne' are 4 and 20 amu respectively.

Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

Explanation:

Round 87.073 meters to 3 significant figures. write your answer in scientific notation. step 1: 87.073 rounds to step 2: write scientific notation : meters...

One mole of aluminum contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, 0.55 moles of aluminum contains 3.31 × 10²³ atoms.

One mole of any substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Aluminum is 13th element in  periodic table. It shows metallic properties as well as some non-metallic properties. The symbol of aluminum is Al. It forms compounds mostly through covalent bonding.

One mole of aluminum contains 6.022 × 10²³ atoms.

Thus, number of atoms in 0.55 moles = 0.55 × 6.022 × 10²³  = 3.31 × 10²³ atoms.

Therefore, the number of Al atoms in 0.55 moles is 3.31 × 10²³ .

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Explanation:

1.The gas law that we will use to solve this problem is the combined gas law.

2.We will choose the combined gas law because there are three variables that are changing in this problem: volume, pressure, and temperature.

3The volume is decreasing in this problem, from 1.74 L to 1.56 L.

The unknown that we are solving for is T2, the temperature at which the balloon will have a volume of 1.56 L.

4We will use the temperature in Kelvin for our calculations. To convert from Celsius to Kelvin, we add 273.15 to the Celsius temperature. Therefore, the temperature we will use in our calculations is 293.35 K (20.2°C + 273.15).

5To find the final temperature, we can use the combined gas law equation:

(P1 x V1)/T1 = (P2 x V2)/T2

where P1 = 1.02 atm, V1 = 1.74 L, T1 = 293.35 K, P2 = 0.980 atm, and V2 = 1.56 L.

Substituting the values into the equation and solving for T2, we get:

T2 = (P2 x V2 x T1)/(P1 x V1)

= (0.980 atm x 1.56 L x 293.35 K)/(1.02 atm x 1.74 L)

= 268.06 K

Therefore, the final temperature after the volume and pressure decrease is 268.06 K, which is approximately 253 K (option A).