Help needed ASAP!!!!!!!

Explanation:

Solutions. 1. If 47 g of KCl dissolved in enough water to give 375 mL of soloution, what is the molarity ... vo volume of solute . ... v/v ethanol, how much 95% v/v ethanol ... prepare 200. mL ...

Answer:

The 15 elements, together with their chemical symbols, are lanthanum (La)

Answer:

PM Promethium

Explanation:

i think A but if I'm wrong sorry

then if increasing then becoming spread out so letter A

Answer:  The vapor pressure of the solution at [tex]29^0C[/tex] is 29.86 mm Hg

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

[tex]\frac{p^o-p_s}{p^o}=i\times x_2[/tex]

where,

[tex]\frac{p^o-p_s}{p^o}[/tex]= relative lowering in vapor pressure

i = Van'T Hoff factor = 1 (for non electrolytes)

[tex]x_2[/tex] = mole fraction of solute  

=[tex]\frac{\text {moles of solute}}{\text {total moles}}[/tex]

Given : 9 moles of [tex]NH_3[/tex] are dissolved in 50 L or 50000 ml of water

mass of water = [tex]density\times volume = 1g/ml\times 50000ml=50000g[/tex]  

moles of solvent (water) = [tex]\frac{\text{Given mass}}{\text {Molar mass}}=\frac{50000g}{18g/mol}=2778moles[/tex]

Total moles = moles of solute  + moles of solvent = 9 mol + 2778 mol = 2787  

[tex]x_2[/tex] = mole fraction of solute  

=[tex]\frac{9}{2787}=3.2\times 10^{-3}[/tex]

[tex]\frac{29.96-p_s}{29.96}=1\times 3.2\times 10^{-3}[/tex]

[tex]p_s=29.86mmHg[/tex]

Thus the vapor pressure of the solution at [tex]29^0C[/tex] is 29.86 mm Hg

Cooking an egg is endothermic because the egg gains heat from the surrounding. The formation of snow is exothermic because water loses heat to the surroundings when it becomes snow.

The endothermic process refers to the process in which heat is absorbed, while the exothermic process refers to the process in which heat is released.

The egg receives/absorbs heat from a heat source,(e.g. the stove), which raises the temperature of the egg and causes it to cook, making it an endothermic process.

On the other hand, heat is released from the water molecule when the water vapor present in the atmosphere condenses and freezes to form snow. Therefore,  the formation of snow is exothermic.

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Cooking an egg is endothermic because the egg gains heat from the surroundings, while the formation of snow is exothermic because water loses heat to the surroundings, resulting in the formation of snow.

In terms of energy transfer, an endothermic process absorbs heat from the surroundings, while an exothermic process releases heat to the surroundings. When cooking an egg, heat is applied to the egg through methods such as boiling, frying, or baking. The egg absorbs heat from the surrounding environment to cook and undergo chemical and physical changes. As a result, cooking an egg is an endothermic process because the egg gains heat from its surroundings.

On the other hand, the formation of snow occurs when water vapor in the atmosphere condenses into ice crystals. This process is exothermic because water vapor loses heat to the surroundings, causing the water molecules to slow down and form a solid structure. The release of heat during this phase transition results in the formation of snow. Therefore, the correct explanation is that cooking an egg is endothermic because the egg gains heat from the surroundings, while the formation of snow is exothermic because water loses heat to the surroundings, leading to the formation of snow.

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Answer:

Burning of the candle is both physical and chemical change. Burning of the candle melts the wax and hence physical state of wax has changed from solid to liquid.  

Again the wax combines with the atmospheric oxygen and changes to carbon dioxide, heat and light.  

Thus both the changes are accompanied by the burning of the candle.

Explanation:

hope this helps!

~mina

The molecule ClO₃⁻ consists of one chlorine atom (Cl) and three oxygen atoms (O), with a negative charge (⁻) on the molecule.

The molecule ClO₃⁻ consists of one chlorine atom (Cl) and three oxygen atoms (O), with a negative charge (⁻) on the molecule.

The chlorine atom (Cl) is in the center, bonded to one oxygen atom (O) through a single bond and to the other two oxygen atoms (O) through double bonds. Each oxygen atom (O) has two lone pairs of electrons around it.

When all the electrons of an atom are shared equally, the charge attained by the atom is known as a formal charge.

The formal charge can be calculated as:

Formal charge =

valence electron - non-bonding electron - bonding electron/2

In the molecule, the formal charge of Oxygen = -1.

In the molecule, the formal charge of Chlorine = +2

The oxygen atom has 8 electrons, in which 2 are shared in the bond formation, and 6 electrons are valence electrons.

The chlorine atom has 7 valence electrons in which 6 electron pairs are shared with the oxygen atom, and 1 lone pair has been available with Cl.

The structure of  molecule ClO₃⁻ has been given in the image attached. The image shows the available lone pairs and the bonding in the structure.

Thus, the molecule has a formal charge of -1 on all oxygen atoms, and +2 on the Cl atom.

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Answer:

1 MgF2 + 1 Li2CO3 --> 1 MgCO3 + 2 LiF

Explanation:

Answer:

Kim:

Wendell:

Gonzalo:

Explanation:

did it on Edge.

Answer:

help with mine ill help with yours

Answer:

1 calcium atom, 2 nitrogen atoms, and there are 6 oxygen atoms

Explanation:

To answer the question, it is important to have an understanding of the order of orbital filling.

The order of orbital filling describes the order in which electrons occupy orbitals.

This order can be determined using the aufbau principle, which states that electrons will occupy the lowest-energy orbital available.

The order of orbital filling is as follows: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

Therefore, the complete form of the order of orbital filling, without blank spaces between orbitals, is:1s2s2p3s3p4s3d4p5s4d5p6s4f5d6p7s5f6d7p

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Answer:

Explanation:

Potential energy builds as the coaster is going up the loop-the-loop and converts to kinetic energy on the way down and out of the loop-the-loop. The potential energy of the coaster is at its lowest and the kinetic energy is at its highest as the coaster moves in the lowest point of the loop-the- loop.

If some solution splashes on the lab bench when pouring the solution into the buchner funnel during vacuum filtration, the mass of precipitate data value will be less than the actual value

When solution splashes onto the lab bench, some of the precipitate may be lost, resulting in a lower amount of collected precipitate in the Buchner funnel than expected.

This loss leads to a lower mass measurement when compared to the actual value if no solution had splashed. Therefore, the mass of precipitate data value will be less than the actual value.

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Answer:

According to Boyle's Law, an inverse relationship exists between pressure and volume. Boyle's Law holds true only if the number of molecules (n) and the temperature (T) are both constant.

Answer: 16 g/mol

Explanation: Molarity is Moles/Liters or Mol/L

(0.50 mol/L)(1.30L) = 0.65mol

(cancels out L)

Molar mass is g/mol so...

10.5g/0.65mol = 16.1 g/mol

Rounded to 2 sig figs is 16 g/mol

The conditions that apply to masses mA and mB for the acceleration to be in one direction (say, mA down the plane), or in the opposite direction are as follows:

1. mA > mB sine (mA down the plane)

2. mB9-mAg sine mBnA

The conditions that apply to masses mA and mB for the acceleration to be in one direction (say, mA down the plane), or in the opposite direction are as follows:

1. mA > mB sine (mA down the plane)

2. mB9-mA gsine mBnA

When the value of mass mA is greater than mB sine (mA down the plane), the acceleration is in one direction.

When mB9-mAgsine mBmA is greater, the acceleration is in the opposite direction.

Determine a formula for the acceleration of the system in terms of mA, mp.0, and 9.

Ignore the mass of the cord and pulley, Express your answer in terms of the variables mA, mp.0, and g.

The formula for acceleration of the system in terms of mA, mp, 0 and 9 is given below;

a = (mB-mAsinθ)/(mA + mB + m0) * g

Where,

θ = angle of inclination of the plane.

g = acceleration due to gravity.

mA = mass of object A.

mB = mass of object B.

m0 = mass of the pulley and cord.

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Answer:

c increase the temperature  

Explanation:

Answer: c) A. 5.606x10²³atoms is the correct answer.

Explanation:

Answer:

pass

Explanation:

pass

Answer:

god says dont use any assault language okay?

Explanation:

The equation for which the value of

Kp = Kc(RT) is valid is B.

2 NO₂(g) ⇌ N₂O₄(g).

The equilibrium constant (Kc) for the forward reaction is the ratio of the product of the concentration of the products to the product of the concentrations of the reactants, with each concentration raised to the power corresponding to the number of moles of that substance in the balanced chemical equation.

The expression for Kc is as follows:

Kc = [C]c [D]d/[A]a [B]b

Where [ ] represents the concentration of each substance in moles per liter and a, b, c, and d are the coefficients in the balanced chemical equation, as shown above.

Thermodynamic equilibrium constant is denoted by Kp. If we use the ideal gas law, we can link Kp and Kc as follows:

Kp = Kc(RT)ⁿ

where R is the ideal gas constant, T is the temperature in Kelvin, and n is the number of moles of gaseous product minus the number of moles of gaseous reactant.

For the equation,

2 NO₂(g) ⇌ N₂O₄(g)

we can see that the products and reactants are in gas phase.

Hence, the value of

Kp = Kc(RT)

is valid for this equation.

Answer: B. 2 NO₂(g) ⇌ N₂O₄(g)

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Answer:

111.03kPa = P₂

Explanation:

Gay Lussac's Law states that the pressure of a gas is directly proportional to the absolute temperature when volume remains constant.

The equation is:

P₁T₂ = P₂T₁

Where P is pressure and T absolute temperature of 1, initial state and 2, final state of the gas.

P₁ = 85.5kPa

T₂ = 127°C + 273.15 = 400.15K

P₂ = ?

T₁ = 35°C + 273.15 = 308.15K

P₁T₂ = P₂T₁

85.5kPa*400.15K = P₂*308.15K

Answer:

maybe falling

Explanation:

Air is a force so its probably pushing down the object then making it fall

I think all objects? Not entirely sure.

Get ready, you should catch it.

Answer:

As an object falls, its gravitational potential energy decreases as its speed—and therefore its kinetic energy—increases.

Explanation:

Study Island

The empirical formula is C3H4.

The empirical formula of mesitylene can be found using the data provided in the problem statement.Let's write the balanced combustion reaction for mesitylene first:2 C9H12 + 25 O2 → 18 CO2 + 12 H2OThe molar mass of the compound (C9H12) can be calculated as follows:9 moles of carbon × 12 g/mol = 108 g/mol12 moles of hydrogen × 1 g/mol = 12 g/molMolar mass of the compound = 108 + 12 = 120 g/molThe amount of CO2 produced is 0.379 g and the amount of H2O produced is 0.1035 g.Moles of CO2 produced = 0.379 g / 44 g/mol = 0.0086 molesMoles of H2O produced = 0.1035 g / 18 g/mol = 0.00575 molesUsing the balanced chemical equation, we can calculate the moles of C9H12 required to produce these amounts of CO2 and H2O. Since we know that the ratio of carbon to water in the compound is 9:12, we can determine the number of moles of each element present in the compound.Moles of C9H12 required = (0.0086 mol CO2 × 2 mol C9H12) / 18 mol CO2 = 0.00096 mol C9H12Moles of carbon = 0.00096 mol C9H12 × 9 mol C / mol C9H12 = 0.00864 mol C9H12Moles of hydrogen = 0.00575 mol H2O × 2 mol H / mol H2O = 0.0115 mol HUsing the mole ratios, we can find the empirical formula:Moles of carbon = 0.00864 mol C9H12 × (1 mol / 0.00864 mol) = 1 mol C9H12Moles of hydrogen = 0.0115 mol H / 0.00864 mol = 1.33 mol H9 carbon atoms and 12 hydrogen atoms are present in one molecule of C9H12. To convert this to an empirical formula, we need to divide by the greatest common factor (GCF), which is 3. Therefore, the empirical formula is C3H4.

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Mass is an intrinsic property of matter and is measured in kilograms. The mass of a bird is a constant. A 15-gram bird is 15 grams, whether measured on the Earth, the Moon, or Mars. Weight is a measure ofthe force of gravity on a physical object and is measured in newtons.