A solution contains 90 grams of a salt dissolved in 100 grams of water at 40ºC. The solution could be an unsaturated solution of...
A) KCl
B) KNO3
C) NaCl
D) NaNO3

Answer:

the correct answer is B

hope it helps !!!

Answer:

2g

Explanation:

The balanced equation for the reaction is given below:

2Na + 2H2O —> 2NaOH + H2

Next, we'll determine the mass of the water (H2O) that reacted and the mass of H2 produced from the balanced equation.

This is illustrated below:

Molar Mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

Molar Mass of H2 = 2x1 = 2g/mol

Therefore, from the balanced equation above, 36g of H2O reacted to produce 2g of H2.

From the illustration above, we can see that 36g of water will produce 2g of H2.

Answer:

6 moles of oxygen, or 3O2.

Explanation:

I would build a proportion for this:

[tex] \frac{2(2)}{2} = \frac{12}{x} \\ 4x = 24 \\ x = 6[/tex]

Answer:

I guess it would be C.

Explanation:

because it sounds familiar

Answer:

77.9

Explanation:

Answer:

Evaporation is the main way water enters the atmosphere.

Explanation:

Evaporation is the main way moisture enters the atmosphere. The amount of evaporation is not the same all of the world. Most evaporation happens over large bodies of water, like oceans and seas. Very little evaporation happens in dry areas, such as deserts. The amount of water on earth is constant. This means it does not change.  

Answer:

78.12g of acetylene

Explanation:

Acetylene and calcium hydroxide are produced when H₂O reacts with CaC₂. The reaction is:

2 H₂O + CaC₂ → C₂H₂ + Ca(OH)₂

Where 1 mole of C₂H₂ (acetylene) is produced per mole of CaC₂

Thus, the addition of 3 moles of CaC₂ produces 3 moles of acetylene.

As molecular mass of acetylene is 26.04g/mol, grams of acetylene produced are:

3mol C₂H₂ × (26.04g / mol) = 78.12g of acetylene

Final answer:

By adding 3 moles of calcium carbide, you will produce 78.12 grams of acetylene, as the reaction yields a 1:1 mole ratio and acetylene has a molar mass of 26.04 g/mol.

Explanation:

To answer the question of how many grams of acetylene are produced by adding 3 moles of calcium carbide (CaC₂), we will refer to the chemical reaction:

CaC₂ (s) + 2 H₂O(l) → C₂H₂(g) + Ca(OH)₂ (s).

According to the balanced chemical equation, 1 mole of calcium carbide reacts with water to produce 1 mole of acetylene. Therefore, if you start with 3 moles of calcium carbide, you will produce 3 moles of acetylene. The molar mass of acetylene (C₂H₂) is approximately 26.04 g/mol. Consequently, to find the mass of 3 moles of acetylene we calculate:

3 moles C₂H₂ × 26.04 g/mol = 78.12 grams of acetylene.

So, by adding 3 moles of calcium carbide, you will produce 78.12 grams of acetylene.

Answer:

nitrogen

Explanation:

Answer:

1) hydrogen peroxide should be stored in dark bottles away from light

2) hydrogen peroxide should be stored in a cool place.

3) Drops of sodium phosphate may be added to inhibit its catalytic decomposition

Explanation:

Hydrogen peroxide is known to dissociate according to the equation;

2H2O2--->2H2O+O2.

This decomposition is facilitated by the following factors;

1) heat

2) light

3) presence of trace amounts of a catalyst

This implies that, if the user stores the hydrogen peroxide in a dark bottle, away from sunlight. It decreases its chances of decomposition.

Similarly, if the hydrogen peroxide bottle is stored in a cool environment, it is not decomposed by heat.

Lastly, drops of an inhibitor such as sodium phosphate may be added to inhibit the effect of any catalyst that may have mistakenly contaminated the hydrogen peroxide sample.

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

[tex]XO[/tex]

And:

[tex]X_2O_3[/tex]

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

[tex]X^{+2}O^{-2}[/tex]

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

[tex]X_2^{+3}O_3^{-2}[/tex]

Thus, answer is b)+2 and +3

Best regards.

In the case when the element x forms the oxides xo and x2o3 the oxidation numbers of element x are option b +2 and +3.

The equation should be X2O3.

Here we can link the subscripts with the oxidation states by knowing that they should not be linked at the time when the compound should be formed. So here the oxygen oxidation state should be -2 and the oxidation state of x should be +2.

Its like

X+2O-2

Here in the second case, the oxidation state of x should be +3 for obtaining 3 and treated as the subscript of oxygen.

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Answer:

Diurnal, Semidiural and mixed

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

Explanation:

on edg

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

3) quite strongly

4) Radioactive decay is a random event

Explanation: edge2023

Answer:

potential energy of an object depend on three factors. If an object has less mass,it will travel more distance, and Higher the mass of an object Distance tra

Explanation:

Answer:

684 mmHg

Explanation:

A mixture of oxygen, hydrogen and water vapor has a total pressure of 684 mm Hg, then the partial pressure of water vapor is 228 mmHg.

Dalton's law of gases states that total pressure of the mixture of gases is equal to the sum of the partial pressure of each gases present there, i.e.

P = p₁ + p₂ + p₃, where

P = total pressure of gas = 684 mmHg

p₁ = partial pressure of oxygen = 380 mmHg

p₂ = partial pressure of hydrogen = 0.100 atm = 76 mmHg

p₃ = partial pressure of water vapor = ?

On putting values, we get

p₃ = 684 - (380 + 76)

p₃ = 228 mmHg

Hence required partial pressure of water vapor is 228 mmHg.

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Answer:

The temperature of the gas contained in the container is -259.35° C

Explanation:

To find the unit of degrees in Celsius (° C) in this case, the ideal gas law equation is used.

PV = nRT

Where P is the pressure, V is the volume, T is the temperature, n is the number of moles, and R is the universal gas constant.

Solving for T would be: PV / nR

T = ( 1.4113 atm * 2.00 L ) / ( 2.49 mol * 0.08205746 atm * L / mol * K  )

T = 2.8226 / 0.2043

T = 13.8K = -259.35 ° C

Answer:

The Celsius temperature of the gas is ‪-259.34 ° C

Explanation:

To answer the question, we note that the universal gas equation can be expressed as follows;

P·V = n·R·T

Therefore;

[tex]T = \frac{P \cdot V}{R \cdot n}[/tex]

Where:

n = Number of moles  = 2.49 mol

P = Pressure = 143 kPa = 143000 Pa

V = Volume = 2.00 L = ‪0.002 m³

T = Temperature in Kelvin, K = Required

R = Universal Gas Constant =  8.3145 J/(mol·K)

Plugging in the values, we have;

[tex]T = \frac{143000 \times 0.002 }{8.3145 \times 2.49 } = 13.81 \, K[/tex]

Hence the temperature of the gas = 13.81 K

Converting the Kelvin temperature to Celsius temperature, we have

Celsius temperature = Kelvin temperature - 273.15

Therefore, 13.81 K to Celsius temperature gives;

13.81 - 273.15 = ‪-259.34 ° C.

Answer:

1.68867925

Explanation: molarity = moles of solute divided by liters of solution so 3.58/2.12 equals 1.68867925

Answer:

V2 = 389mL

Explanation:

At STP: P=760 torr and T=273K.

To solve this question, we could use Charles' law since both the number of mole and pressure are constant:

V1T1=V2T2

⇒V2=T2×V1T1

⇒V2=273K×425mL/298K=389mL

Answer:

pH=105

Explanation:

The higher the pH, the more alkaline it is.

Answer:

milk of magnesia, pH = 10.5

Explanation:

just got it right one edge

Final answer:

Solid iodine is brittle due to weak dispersion forces between iodine molecules in its molecular lattice structure, which when stressed can cause layers to shift and fracture.

Explanation:

Iodine is brittle in its solid state because of its molecular lattice structure, where individual iodine molecules are held together by relatively weak dispersion forces. Despite being the strongest within the halogen group, these forces are not strong enough to allow for flexibility, so when iodine crystals are subjected to mechanical stress, layers of molecules can shift, leading to fracture and resulting in the brittleness observed. Iodine's electron configuration, with -empty valanced orbitals, allows for these molecular interactions to occur in its solid state.

D)6 electrons are contained in the three single bonds.

An ammonia molecule can donate and be given up to a few hydrogen bonds. Ammonia clusters are made out of ammonia molecules connected via hydrogen bonds. The hydrogen bond community of ammonia clusters is related to ammonia's homes.

The bond formed via Nitrogen and Hydrogen is a covalent bond because each is non-metal. While those two atoms bond, Nitrogen nonetheless has an excess of 2 valence electrons which might be called the “lone pair”.

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Answer:

35

Explanation:

I got it wrong and it gave me the right answer.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 35ml of 15.0 HNO3 must she prepare.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

According to the dilution law,

M₁V₁=M₂V₂

where, symbols have following meaning

M₁ = molarity of stock solution = 15.0 M

V₁ = volume of stock solution =?

M₂ = molarity of dilute solution =1.00M

V₂ = volume of dilute solution = 525 mL

substituting all the given values we get

M₁V₁=M₂V₂

15.0×V₁=1.00×525

V₁=35ml

Therefore, 35ml of 15.0 HNO3 must she prepare.

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Answer:

Inflammation

Explanation:

Inflammation is the response to a cut. The blood vessels expand when you get cut to allow white blood cells to flock to the wound site. These attack any bacteria that got past the clot. If you mean excess bacteria, then that would be an infection.

The redness around a wound caused by harmful bacteria is due to inflammation, an immune response that involves blood vessel dilation, increased blood flow, and white blood cells combatting the infection.

When harmful bacteria invade a wound, the skin around the wound turns red due to a process called inflammation. This biological response is the body's second line of defense against pathogens. Inflammation is triggered by the release of chemicals when skin or other tissues are damaged. These chemicals cause blood vessels to dilate, increasing blood flow and making the area red and warm.

The influx of blood also delivers white blood cells like neutrophils to the wound site, and these cells help to combat the bacterial invaders. A well-known agent in this process is histamine, which not only contributes to the dilation of blood vessels but also helps attract immune cells to the site of injury. This inflammatory response helps to establish a physical barrier against the spread of infection and begins the process of tissue repair.

Answer:

D) Dispersion; dispersion

Explanation:

Pentane or heptane are non-polar molecules so both of the , dispersion or london force exists as intermolecular force exists among molecules of pentane or heptane . So these bonds needs to be broken and dispersion  interaction takes place between molecules of pentane and heptane. Dispersion interaction  of AB type is stronger than AA or BB type.

Mixing of nonpolar molecules pentane and heptane results in the breaking and forming of dispersion forces, which are intermolecular forces present in such hydrocarbons.

When pentane (C5H12) and heptane (C7H16) mix, the type of intermolecular forces that must be broken are dispersion forces. Both pentane and heptane are nonpolar molecules hence the only intermolecular forces present are the weak dispersion forces or London dispersion forces. These are the instantaneous dipole-induced dipole forces that result from transient shifts in electron density. The somewhat stronger intermolecular force among nonpolar hydrocarbons is basically due to larger electrong cloud, and the only type of 'attractive forces' available for them to form when they mix are still the same - dispersion forces

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Answer:

Ethyn(g) + 5oxygen(g) ------------> 4carbondioxide(g) + 2water(l)

Answer:

Hydrogen

Explanation:

Four hydrogen atoms combine together during fusion reaction on the sun. In the core of the Sun hydrogen is being converted into helium.

Fusion is the process by which the sun and stars are powered. It is the reaction in which two hydrogen atoms combine or fuse to form a helium atom. Some of the hydrogen's mass is converted into energy during the process.

The Sun and other stars are powered by nuclear fusion reactions. A fusion reaction occurs when two light nuclei combine to form a single heavier nucleus.

When two atoms collide, they fuse to form a heavier atom, such as when two hydrogen atoms fuse to form one helium atom. This is the same process that powers the sun and generates enormous amounts of energy many times more than fission.

Thus, Four hydrogen atoms combine together during fusion reaction on the sun.

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Answer: In New York City

Explanation: I'm not a nerd but I think it would be that because when your in the middle of new York city, and you scream it echos.

Answer:

I believe it’s 4

Explanation:

Answer:

im guessing D

Explanation:

hope it helps

Answer:

Sun

Explanation:

It Might be raining meaning that the sun isn't shining very brightly.

Answer:

The solar energy might cost a lot in order to install it. As well, there is no solar power at night so you won't have the electricity you need. So like in winter in some place there is no Sun, more specifically the light from the Sun, it is sometimes cloudy all day and there is no light coming from the Sun, so like I said you won't have electricity.

Explanation:

I hope my explanation was understandable :/

Answer:

Temperature (T1) = 954.86 K or 681.86 ° C

Explanation:

Given:

Temperature (T) = 1000° C = 1000 + 273.15 = 1,273.15 K

Volume of the piston (V) = 20 L

Volume of the piston (V1) = 15 L

Find:

Temperature (T1) = ?

Computation:

⇒ [Temperature (T) / Volume of the piston (V)] = [Temperature (T1) / Volume of the piston (V1) ]

⇒ [1,273.15 K / 20 L] =  [Temperature (T1) / 15 L]

⇒ Temperature (T1) = 954.86 K or 681.86 ° C

Using Charles's Law, which relates gas volume and temperature, it is determined that when a gas-filled piston with an initial volume of 20 L at 1000°C compresses to 15 L, the outside temperature is approximately 204.28°C.

To determine the temperature outside when the piston has a volume of 15 L, we need to use Charles's Law, which states that the volume of a gas is directly proportional to its absolute temperature when the pressure is held constant. Mathematically, Charles's Law is expressed as V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature and V2 and T2 are the final volume and temperature. Given that at 1000°C (which is 1273.15 K), the volume of the piston is 20 L, we can find the outside temperature (T2) when the volume of the piston is 15 L by rearranging the formula to T2 = (V2×T1)/V1.

Let's calculate the outside temperature:

T2 = (15 L × 1273.15 K) / 20 L
T2 = 9548.625 K / 20
T2 = 477.43125 K

To convert this back to Celsius, we subtract 273.15 from the Kelvin temperature.

T2 (in °C) = 477.43125 K - 273.15
T2 (in °C) = 204.28°C

Therefore, the outside temperature is approximately 204.28°C when the piston has a volume of 15 L.