Select the correct answer. One night, an ice storm strikes your town. When you go outside in the morning, your entire front walkway is covered in a thick layer of ice. icy brick walkway in winter Your father asks you to walk to the corner store to buy a substance that you can add to the solid water to lower its freezing point and therefore melt it. When you get to the store, you read the labels on several containers holding substances that are soluble in water. For equal molar amounts, which substance will be the most effective? A. calcium chloride (CaCl2 → Ca2+ + 2Cl−) B. fructose (C6H12O6 → C6H12O6) C. potassium chloride (KCl → K+ + Cl−) D. sucrose (C12H22O11 → C12H22O11)

The reaction as shown is a combustion reaction. 29.8 kCal of heat is produced when 4.20 g of ethanol reacts with O2 gas.

The equation of this reaction is shown below;

C2H5OH + 3O2 →2CO2(g)+3H2O(l)+327 kcal

From the reaction equation, we can see that 1 mole of ethanol produces 327 kcal of heat.

Now, we have to find the number of moles in  4.20 g of ethanol  as follows;

Number of moles = mass/molar mass = 4.20 g/46 g/mol = 0.091 moles

If 1 mole of ethanol yields 327 kcal of heat

0.091 moles of ethanol yields 0.091 moles × 327 kcal / 1 mole

= 29.8 kCal

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Answer:

The chemical formula for the ionic compound formed by Au3+ and

HSO3-compound  is Au(HSO3)3

Explanation:

The charge on Au ion is \(+3\)

And the charge on HSO3- is \(-1\)

Thus, the number of atoms required by HSO3- to complete its octate is 1. On the other hand Au has 3 excess ions and hence it is to be released to reach the stable state.

So three molecules of HSO3- will combine with one atom of Au 3+

Thus, the compound formed by these two is Au(HSO3)3

When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

A chemical reaction is a type of reaction that involves the rearrangement of atoms to form new substances.

The indications that a chemical reaction has occurred is:

Therefore, When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

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Answer:

here is ur and

Explanation:

Coal, oil and natural gas are called fossil fuels. Fossil fuels are burned to make energy. Burning fossil fuels also releases CO2 (carbon dioxide) gas into the atmosphere. Most air pollutants (such as sulfur dioxide) don't stay in the atmosphere very long.

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Answer:  A and C are the right answer.

Explanation:

Density of the given sample is 12.66 grams per milliliter.

Mass per unit volume is the definition of a material's density. The degree to which matter is packed together is fundamentally measured by density. It is a particular physical characteristic of a specific thing.

Density = mass/volume

Given mass = 50g

Given Volume = 3.95mL

According to question, we are required to find the density in units : grams per milliliter

Since the given values for mass and volume are grams and milliliters respectively, no change in units is required.

Putting the given values in the formula, Density = mass/volume

Density = 50/3.95

Density = 12.658 grams per milliliter

We can say, Density = 12.66 grams per milliliter

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A second is defined as the time taken by 9192631770 radiation cycles to shift the cesium-133 atom's fundamental state from one level to another (si unit of time).

Simply expressed, the study of the chemical compound that radiation, typically ionizing radiation, induces in matter is known as radiation chemistry. Common themes in the field include radiation-induced particle nucleation and growth, radiation-enhanced H 2 generation, A second is defined as the time taken by 9192631770 radiation cycles to shift the cesium-133 atom's fundamental state. And damaging effects on nuclear system chemistry. Due to its ground state electron state's [Xe] 6s1 configuration, the caesium atom's atomic term symbol is 2 S 1/2. This shows that the atom has a single unpaired electron and an overall electron spin of 1/2.

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Answer:

more dense

Explanation:

cold air particles are moving slower, because they have less energy.

\(\\ \tt\bull\rightarrowtail2 N_2+O_2\longrightarrow 2N_2O\)

Moles of N_2

\(\\ \tt\bull\rightarrowtail \dfrac{48.7}{14}=3.4mol\)

Molar mass of N_2O=44g/mol

Mass of N_2O formed

The mass of nitrous oxide that can be formed from 48.7 g of nitrogen is approximately 76.525 grams. To calculate the mass of nitrous oxide (N₂O) formed from a given mass of nitrogen (N₂), one needs to consider the balanced chemical equation.

N₂+ O₂ -> N₂O

The balanced equation tells us that 1 mole of nitrogen (N₂) reacts with 1 mole of oxygen (O₂) to produce 1 mole of nitrous oxide (N₂O).

Given mass of nitrogen (N₂) = 48.7 g

To find the number of moles of nitrogen (N₂), one divide the given mass by the molar mass of nitrogen, which is approximately 28.02 g/mol.

Number of moles of N₂= 48.7 g / 28.02 g/mol ≈ 1.738 mol

The balanced equation shows that 1 mole of nitrogen (N₂) reacts to form 1 mole of nitrous oxide (N₂O).

So, the number of moles of nitrous oxide (N₂O) formed is also approximately 1.738 mol.

To find the mass of nitrous oxide (N₂O), one multiply the number of moles by its molar mass, which is approximately 44.01 g/mol.

Mass of N₂O = 1.738 mol × 44.01 g/mol ≈ 76.525 g

Therefore, the mass of nitrous oxide formed from 48.7 g of nitrogen is approximately 76.525 grams.

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Astatine : Halogen

Nitrogen : Nonmetal

Krypton : Noble gas

Chlorine : Halogen

Sulfur : Nonmetal

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Answer:

The sky looks different in each nighttime section of the artifact because the artifact sections represent different seasons. ... Different constellations are visible on different nights throughout the year because of the earth's orbit. The Earth orbits around the sun. A full orbit is 365 days or one year.

Explanation:

Answer:

The answer is 117.

Explanation:

There’s not really a way to calculate atomic radius. It comes from empirical data and is in the periodic table. The only way I can think of is Bohr’s radius constant.

₀ = 4₀(ℎ bar)²/_e (_e)²

Calculating atomic radius can get complicated so it’s best to leave it at this.

Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.

To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:

Molarity (M) = moles of solute / volume of solution (in liters)

First, let's convert the volume of the solution from milliliters (mL) to liters (L):

5000 mL = 5000/1000 = 5 L

Now, we can rearrange the formula to solve for moles of solute:

moles of solute = Molarity (M) x volume of solution (L)

moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol

Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:

mass of solute = moles of solute x molar mass of solute

mass of glucose = 1.075 mol x 180.16 g/mol

mass of glucose = 194.0 g (rounded to three significant figures)

Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.

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Answer:

The ability for water to form bubbles

the formation of a meniscus in a graduated cylinder with water

the inability of water to mix with oil

the melting point of a substance

the ability of detergents to clean clothes

Explanation:

Answer:these are the answers

Explanation:

edge

This equation shows that n moles of CO₂ are created for every 1 mole of oxygen that is consumed. To convert to grams, we must first compute how many moles of O₂ are produced from 8.5 g of O2, then use that amount to establish how many moles of CO₂ are generated.

One carbon atom contributes 12.01 g/mol to carbon dioxide (CO₂), while the two oxygen atoms together contribute (2)(16.00) = 32.00 g/mol.

022 10 23 molecular units 8 grams of oxygen gas have = 8 32 6. 022 10 23 = 1. 5 10 23 molecules in it. Thus, 1 will be the appropriate response to be entered in the blank.

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Answer:

162.4 cm

Explanation:

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ANSWER: 1.41 x \(10^{-4}\) grams

EXPLANATION:

1. The formula for mass is m=nM therefore we need to find moles (n) because we don't have that yet.

\(n = CV\)

n = (\(2.40\) × \(10^{-5}\)) x 0.12     (I converted 120.0 mL to L, which makes it 0.12)

n = 0.00000288 mol

2. Now we can find the mass.

m = n x M

m = 0.00000288 x 49.0072   (molar mass, M, of NaCN is 49.0072)

m = 0.00014114073 grams ≈ 1.41 x \(10^{-4}\) grams

Answer:

ddddddfrvtrnsyjemn

Explanation:

dddddddddddd

look at the screenshot

Substance that gives out ions when dissolved in water, which are able to conduct electricity describes an electrolyte.

Nadia will take 8 seconds to reach her friend's house.

Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).

To calculate the time Nadia will take to reach her friend's house, we can use the formula;

time = distance / speed

where distance is the amount of space traveled by an object, and time is the duration of travel.

Put the values given in the problem, we have:

time = 24 meters / 3 m/s

time = 8 seconds

Therefore, Nadia will take 8 seconds.

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The ratio of concentration of ammonia and ammonium chloride : 0.05

Given

pOH=5

Kb for NH3 =1.8 x 10-4

Required

The ratio of concentration of ammonia (NH₃) and ammonium chloride(NH₄Cl)

Solution

Solutions containing ammonia and its salt: ammonium chloride are called alkaline buffers

Can be formulated : ( for the same of the volume, mol=concentration)

\(\tt \displaystyle [OH-]=Kb\times\frac{weak\:base\:mole}{salt\:mole\times valence}\)

pOH=-log [OH⁻]

pOH=5⇒[OH⁻]=10⁻⁵

Valence for NH₄Cl = 1, so the concentration ratio :

\(\tt 10^{-5}=1.8\times 10^{-4}\times \dfrac{[~NH_3]}{[NH_4Cl]}\\\\0.05=\dfrac{[~NH_3]}{[NH_4Cl]}\)

The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

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The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

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Answer:

yes

Explanation: Our DNA determines how many muscle fibers a person is born with. This number never changes cause one can't make more muscle fibers during their lifetime. With more muscle fibers, one has the potential to be stronger.

It is an acquired trait because you could train your muscles to become bigger. When you train, for example resistance training, your muscle produces more myofilaments which increases their diameter. This is why you develop large muscles when you train.

Answer:

When a photon of light hits an electron, the photon transfers some of its energy to the electron. If the photon has enough energy, it can excite the electron, which means that it can raise the electron to a higher energy state. In other words, the photon's energy can be absorbed by the electron, causing the electron to move to a higher energy level within an atom or molecule.

Answer:

Explanation:

As we know that in the photoelectric effect, a low-energy gamma photon that collides with an atom can tranfer all its energy to an inner orbital electron and cause the ejection of the ELECTRON FROM THE ATOM

The amount of energy required to eject the electrons depends upon on the atomic number.

The relation between V, R, and I can be determined using Ohm's Law and the principles of parallel circuits.

Ohm's Law states that the voltage across a resistor (V) is equal to the current (I) flowing through it multiplied by its resistance (R). This can be expressed as V = I × R

In a parallel circuit, multiple resistors are connected in such a way that the voltage across each resistor is the same. This means that the voltage across all the resistors in parallel will be equal to the total voltage applied to the circuit. Therefore, the voltage (V) in the above equation represents the total voltage applied to the parallel circuit.

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Your question is incomplete, most probably the full question is this:

What is the relation between V, R, and I in a parallel circuit?

The sample response is : how do mass and the type of material affect thermal energy transfer?

So one need to have include the below factors in your answer:

The mass of an object influences allure thermal strength transfer traits. Generally, objects accompanying best public have greater warm strength depository volume.

They can absorb more heat strength before experience a meaningful change in hotness. If an equal amount of heat is used to both objects, the object accompanying better mass will demand more heat strength to raise allure temperature distinguished to the object accompanying tinier mass .

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. In this experiment, you need to examine the idea of the thermal energy transfer. Using a controlled experiment, what might a good question about the variables that affect thermal energy transfer be? Thermal energy transfer depends on many properties, be limit your question to only two. What did you include in your question?

The component which is least soluble in gasoline is 2.candle wax. So, correct option is 2.

The octane rating still up in the air by blending fills from just ordinary heptane and iso-octane (2,2,4-trimethylpentane, an exceptionally extended octane), and relegating hostile to thump evaluations of zero for typical heptane and 100 for unadulterated iso-octane. The counter thump rating of this combination would be equivalent to the level of iso-octane in the blend. Various isomers of octane can add to a lower or higher octane rating. For instance, n-octane (the straight chain of 8 carbon molecules with no stretching) has a - 20 (negative) Exploration Octane Rating, while unadulterated iso-octane has a RON rating of 100. A few energizes have an octane rating higher than 100, outstandingly those containing methanol or ethanol.

Candle wax exist in solid state.On dissolving candle wax in octane it will least dissolve becuase of inert reaction between octane and candle wax.

Hence,correct answer is 2.

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