Which of the following are soluble in water: salt, gravel, or pepper

Due to the lack of supply of energy the methane could not change its phase before 2007.

Even though it has been summer since 2002, the lake didn't dry up until 2007. After 2007, the sun had given out enough energy for the methane molecules' kinetic energy to rise enough to outweigh their attraction to one another. The methane molecules in the lake were gaining kinetic energy at this moment, but the lake was still liquid. The temperature of the molecules remains constant while they melt because the average kinetic energy of the molecules does not vary.

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1) List known values.

sample: 0.600 mol

Pressure: 1.0 atm

Temperature: 15ºC

Constant: 0.082057 L⋅atm⋅K−1⋅mol−1

List unknown values

Volume:

2) Set the equation and solve for V.

3) Converting to proper units.

15ºC + 273.15 = 288.15 K

4) Plug in known values.

n: 0.600 mol

R: 0.082057 L⋅atm⋅K−1⋅mol−1

T: 288.15 K

P: 1.0 atm

The sample will occupy a volume of 14.19 L.

Answer: 25 moles

Explanation:

I remember learned this in last year AP Chemistry class

Answer:

2Cu2O + C --> 4Cu + CO2

Explanation

The Law of conservation of Mass states You can not destroy or create math in a chemical reaction, meaning you must have the same amount at the beginning and the end. This equation keeps the same amount of atoms on both sides.

Answer: Yes, it is a balanced equation.

Explanation:

https://chemequations.com/en/?s=Cu2O+%2B+C+%3D+Cu+%2B+CO2

This is where I got the answer so you know.  Hope this helps :)

Total slack can be used without coordinating with managers of succeeding activities. The correct option is A.

Total slack refers to the amount of time that an activity can be delayed without affecting the overall project completion time or the start time of the succeeding activities. It is an indicator of the flexibility of the schedule and can be used by a project manager to identify activities that can be delayed without affecting the overall project completion time.

Total slack can be calculated by subtracting the duration of the activity from the difference between the late finish time and the early start time of the succeeding activity. Since total slack does not affect the start time of succeeding activities, it can be used without coordinating with the managers of the succeeding activities.

On the other hand, free slack, critical float, and float pad all require coordination with the managers of the succeeding activities as they can impact the start time of the succeeding activities. Therefore, correct option is A. Total slack.

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Answer:

Most chunks of land will probably explode into a giant dust cloud if you hit them together at hundreds of miles per hour. with these types of collisions, the densest stone will turn to gravel. people will be flung into the air. people will tumble across the ground, or be flattened by a sudden acceleration.

Explanation:

Thank you Charlie

Answer:

nah man

Explanation:

Answer:

photosynthesis

Explanation:

that's the way plants feed themselves

Answer:

photosynthesis

Explanation:

I hope i helped

Answer:

Alchemy is based on mystic view of reality whereas chemistry is based on experiments, observations and facts.

If it takes 7 drops of an alkaline to neutralize 3 drops of acid it means that acid is much stronger than the alkaline. So more is needed to be used.

Answer:

C

Explanation:

hope this helps

Answer:

solute in a fixed volume of solution

Concentration(c) = number of moles of solute(n) / volume of solution (v)

25.0 mL of water is added to 125 mL of a 0.150 M LiOH solution and solution becomes more diluted.

original solution molarity - 0.150 M

number of moles of LiOH in 1 L - 0.150 mol

number of LiOH moles in 0.125 L - 0.150 mol/ L x 0.125 L = 0.01875 mol

when 25.0 mL is added the number of moles of LiOH will remain constant but volume of the solution increases

new volume - 125 mL + 25 mL = 150 mL

therefore new molarity is

c = 0.01875 mol / 0.150 L = 0.125 M

answer is 0.125 M

Explanation:

did this answer got right

Answer:

0.125

Explanation:

Just completed the test and got it correct.

Answer:

1. C

2. A

3. A

Explanation:

The two correct answers for risks involved in both underground mining and surface mining are Ground instability and Respiratory disease.

Ground instability: Both underground mining and surface mining can be susceptible to ground instability, which can lead to cave-ins, landslides, or collapses.

Respiratory disease: Both types of mining can expose workers to dust and harmful particles, which can cause respiratory diseases such as pneumoconiosis (e.g., coal workers' pneumoconiosis) or silicosis.

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Answer:

The electron cloud - or - electron orbitals

Explanation:

Protons and neutrons are held in the nucleus of the atom; electrons orbit around the nucleus in orbitals. Modern atomic theory tells us that these orbitals are not necessarily a circular or elliptical path but more like a cloud-like area where electrons are likely to be found at any given time.

Explanation:

atomic number shows proton

The molarity of the solution of 0.0480 M KCl is 0.05261 M.

Given that:

Assuming that 1.0 kg of the solvent is present, we can think that 0.0480 moles of KCl are the moles of solute. Then, we can determine the mass of KCl using the molar mass

  0.0480 * (74.5513 / 1) = 3,578 g KCl

The mass of the solution is 1 kg (1000 g) + 3,578 g = 1,003.578 g.

Using the given density and the moles of solute, we can calculate the molarity of the solution as follows:

[KCl} = mol KCl / volume solution

  = 0.0480 / (1,003.578 * 1/1.10 * 1/1000)

  = 0.05261 M

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Hence, the probability that the mean cholesterol level of the sample will be greater than 217 is 0.034. Answer: 0.034.According to the given statement, we have the following data.

mean (μ) = 205 mg/dLstandard deviation

(σ) = 35 mg/dLsample size

(n) = 46(a) Probability that the mean cholesterol level of the sample will be no more than 205.To find this, we will use the z-score formula.z

= (x - μ) / (σ/√n)Here,

x = 205

μ = 205

σ =

35n

= 46Plugging in these values, we get,

z = (205 - 205) / (35/√46)

z = 0Hence, the probability that the mean cholesterol level of the sample will be no more than 205 is 0.5. Answer: 0.5

(b) Probability that the mean cholesterol level of the sample will be between 200 and 210:

To find this, we need to standardize the values and use the z-table.P(z < (210 - 205) / (35/√46)) - P(z < (200 - 205) / (35/√46))P(z < 1.65) - P(z < -1.65) = 0.4495 - 0.0505

= 0.3990Hence, the probability that the mean cholesterol level of the sample will be between 200 and 210 is 0.3990. Answer: 0.3990

(c) Probability that the mean cholesterol level of the sample will be less than 195: To find this, we need to standardize the values and use the z-table.P(z < (195 - 205) / (35/√46))P(z < -2.91) = 0.002Hence, the probability that the mean cholesterol level of the sample will be less than 195 is 0.002. Answer: 0.002

(d) Probability that the mean cholesterol level of the sample will be greater than 217: To find this, we need to standardize the values and use the z-table.P(z > (217 - 205) / (35/√46))P(z > 1.82) = 0.034 Answer: 0.034.

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The number of moles of the solid Ba(NO₃)₂ added to the 300 mL of the 0.20 M Fe(NO₃)₃ to increase the concentration of NO₃⁻¹ ion to 1 M is 0.06 mol

The number of Fe(NO₃)₃ = molarity × volume

The number of Fe(NO₃)₃ = 0.20 × 0.300

The number of Fe(NO₃)₃ = 0.06 mol

Moles of NO₃⁻¹  = 0.18 mols present

Moles of NO₃⁻¹ need = 1 × 0.300 L

Moles of NO₃⁻¹ need = 0.300 mol

Number of moles he have = 0.300 - 0.180

                                            = 0.120 mol

Ba(NO₃)₂  contains 2 moles of  NO₃⁻¹, therefore number of moles of  Ba(NO₃)₂ added :

Moles of Ba(NO₃)₂ = 0.120 / 2 = 0.06 mol

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Answer:

Thermal energy refers to the energy contained within a system that is responsible for its temperature.

The best solvent choice for this analysis will be 50% hexanes in ethyl acetate.

Ethyl acetate having a molecular weight of 174.28, is observable in chromatography paper.

In the chemical examination, chromatography could be a research facility strategy for the partition of a blend into its components.

The blend is broken down into a liquid dissolvable (gas or fluid) called the versatile stage, which carries it through a framework (a column, a capillary tube, a plate, or a sheet) on which a fabric called the stationary stage is settled.

Since the distinctive constituents of the blend tend to have diverse affinities for the stationary stage and are held for distinctive lengths of time depending on their intuition with their surface destinations causing them to partition.

The partition is based on the differential dividing between the portable and the stationary stages. Unpretentious contrasts in a compound's parcel coefficient result in differential maintenance on the stationary stage and hence influence the division.

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Answer: 1) ago

Explanation:

Answer:

Although atoms with equal numbers of protons and electrons exhibit no electrical charge, it is common for atoms to attain the stable electronic configuration of the inert gases by either gaining or losing electrons. The metallic elements on the left side of the periodic table have electrons in excess of the stable configuration. Table 1 shows the electron loss necessary for three light metals to reach a stable electron structure.

The positive charge on the resulting metal ion is due to the atom possessing more nuclear protons than orbital electrons. The valence electrons are most distant from the nucleus; thus, they are weakly held by the electrostatic attraction of the protons and, consequently, are easily stripped from atoms of the metals.

By contrast, the nonmetallic elements on the right side of the periodic table have fewer electrons than that of a stable configuration and can most readily attain the stable configuration of the inert gases by gaining electrons. The negative charge on the resulting nonmetal ion is due to the atom possessing more orbital electrons than nuclear protons. Table 2 compares three nonmetals to the inert gas argon.

Because metallic elements tend to lose electrons and nonmetallic elements tend to gain electrons, a pair of contrasting elements will exchange electrons so that both achieve stable electronic configurations. The resulting ions of opposite charge have a strong force of electrostatic attraction, which is called an ionic bond. Note: This bond forms through the complete transfer of electrons from one atom to another, in contrast to the electron sharing of the covalent bond.

The force of attraction between two points of opposite electrical charge is given by Coulomb's law:  

equation

where q + is the positive charge, q – is the negative charge, and d is the distance between the two charges. This law of electrostatic attraction can be used to measure the distance between two spherical ions because the charges can be considered to be located at the center of each sphere. (See Figure 1.)

Figure 1. The distance between ionic charges.

figure  

Notice that the distance between the centers of the two ions is the sum of radii of the ions. The appropriate electrostatic force then is calculated from the equation  

equation

where q C is the charge of the positive cation, q A is the charge of the negative anion, and the denominator is the sum of their radii.

The strength of ionic bonding, therefore, depends on both the charges and the sizes of the two ions. Higher charges and smaller sizes produce stronger bonds. Table 3 shows the approximate radii of selected ions, which have the electronic configuration of an inert gas. The radii are in equation.

For ions of the same charge, the ionic radius increases as you go down any column because the elements of higher atomic number have a greater number of electrons in a series of electronic shells progressively farther from the nucleus. The change in ionic size along a row in the chart just above shows the effect of attraction by protons in the nucleus.

In Table 4, the five ions O 2– through A1 3+ are all isoelectronic; that is, they have the same number of electrons in the same orbitals.

For continuity, the neutral Ne atom is also in the chart, with its atomic radius. As you proceed to the right in Table 4, the greater number of protons attracts the electrons more strongly, producing progressively smaller ions.

Now use Coulomb's law to compare the strengths of the ionic bonds in crystals of magnesium oxide and lithium fluoride. The sizes of the four ions are taken from the tabulation of radii of cations and anions in Table 5.

equation

Comparing the two relative forces of electrostatic attraction that you calculated, you can conclude that ionic bonding is considerably stronger in magnesium oxide. This affects the physical properties and chemical behavior of the two compounds. For example, the melting point of MgO (2,852°C) is much higher than that of LiF (845°C).

The strength of chemical bonding in various substances is commonly measured by the thermal energy (heat) needed to separate the bonded atoms or ions into individual atoms or ion

Explanation:

Answer:

Explanation: the answer is YES

CO(NH2)2  and (NH2)2 CO is the urea

Answer:

The new substance will need more energy to form its chemical bonds than the old substance will release. ... More energy will be released from the old substance than the new substance will need to form its chemical bonds.

Explanation:

This is the answer I got. Hope it's really helpful

Answer:

"Which is evidence that a chemical reaction has likely occurred?"

The correct answer would be,

B. the formation of a precipitate

Explanation:

Got it right on my test, have a great day!

Answer:69.8

Explanation:

To calculate the standard enthalpy change, δ∘, for the reaction A + B ⟶ 2C, we can use Hess's Law and the given information about the enthalpies of formation and standard enthalpy change for the reaction A + B ⟶ 2C at 298 K is +662.4 kJ/mol.

First, we can write the two reactions and their enthalpy changes as follows: A + B ⟶ 2D δ∘ = +661.8 kJ/mol 2D ⟶ D + C δ∘ = -308.0 J/K/mol = -0.308 kJ/mol/K (note that this is given in J/K/mol, so we need to convert it to kJ/mol)

Next, we can use the fact that the enthalpy change is a state function, meaning that it only depends on the initial and final states of the system and not on the path taken between them.

Therefore, we can add the two reactions together to obtain the overall reaction of interest: A + B ⟶ 2C δ∘ = ? To do this, we need to cancel out the intermediate species, D, on both sides of the equation.

We can do this by multiplying the second reaction by 2 and reversing it: 2D ⟶ 2C δ∘ = -2(-0.308 kJ/mol/K) = +0.616 kJ/mol/K A + B ⟶ 2D δ∘ = +661.8 kJ/mol A + B ⟶ 2C δ∘ = +662.4 kJ/mol. Therefore, the standard enthalpy change for the reaction A + B ⟶ 2C at 298 K is +662.4 kJ/mol.

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MCPBA is useful reagent for epoxide formation and ketone to ester formation and it epoxidized alkene to epoxide and also oxidize ketone to ester and so we can't selectively epoxidize an alkene if both alkene and ketone are present

Purified mCPBA is a useful reagent for the oxidation of various classes of aldehyde α branches aliphatic aldehydes undergo beayer villiger oxidation to form formates and α bramced α-β unsaturated aldehydes yield enol formates and or epoxides and α hydoxylated aldehydes yield ketone and most aldehydes and ketone have a low celling temprature below ambient temprature that is these compound do not polymerize above room temprature and mCPBA is strong oxidant comparable to other peracid and the advantage of 3 chloroperbenzoic acid is it handling

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Answer:

3p6 3d4

Explanation:

3d will come after 3p => 3p 3d

p will hold maximum of 6 electrons while d will hold maximum of 10 electrons.

if there are 8 more electrons to 3p2, then 4 will fill 3p so it will become 3p6

then the other 4 will fill 3d to become 3d4