Which action would most likely create a light waye?
A. producing a fire fram fuel
B. dropping a pebble in a pond
O
C. pouring water into a pile of dirt
D. hitting a drum with a drumstick

Answer:

1.875 gallons

Explanation:

AnswerExplanation:I finsished d

Answer:

17.55L

Explanation:

0.48mol : 11.7

0.72mol :   x

0.48x = 8.424

x = 17.55

Answer:

How do you think these devices work?

Both devices follows the principle and endothermic and exothermic reactions.The cold pack is made up of two bags. The first bag contains water.And it is placed inside the second bag which contains NH4NO3 , and urea. Therefore, when the water bag is squeezed, the bag busted releasing the water  which dissolves  the surrounding  solid compounds. These compounds absolved heat energy in an endothermic reaction.

The components of hand warmers are  activated carbon, salt iron, water,,and cellulose.The Oxidation of iron when exposed to the air (oxygen)generated heat in an exothermic reaction to keep the hand warm.

Thus the cold results from the endothermic reaction as the solid compounds in cold packs absorbed water to break bonds to melts,and the hotness comes  from formation of new bonds(exothermic) as oxidation of Fe to form new compounds with other chemical occurs.

Explanation:

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid.

On two distinct paper surfaces, we will test four known liquids and an unknown liquid. we will identify an unidentified liquid using their observations. We will learn that we can effectively identify an unidentified liquid by combining the findings of two experiments. On a coffee filter dipped in green food coloring, we will also add water and salt water. we can tell a big difference in how each liquid separates the hues of the green food coloring. When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid. The equal quantity of each liquid should be applied to the paper in the same location for the test to be fair.

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Answer:

Alcohol?

Explanation:

(for Plato)

Answer:

Answer is explained in the explanation section below.

Explanation:

Penetration refers to the proximity of electrons in an orbital to the nucleus.

Deeper-penetrating electrons have less shielding and therefore a higher Effective nuclear charge (Zeff), but they better shield other electrons.

To illustrate penetration, we may use the idea of Zeff, or effective nuclear charge. It's actually the difference between the number of charged protons and the number of shielded electrons. To put it another way, how effective the nucleus is at attracting electrons. Since they do not shield themselves, the core electrons penetrate the most and are exposed to the most strong nuclear charge.

The electron probability density is highest in the orbital's centre or nucleus for 28-orbitals.

In a multi-electron unit, the electron density near the nucleus of an atom for each shell and subshell of an electron is used to measure the nucleus penetration by an electron.

Since it has a higher electron density near the nucleus, the 2s electron penetrates the nucleus of the atom more than the 2p electron.

A 2s electron is less well shielded by the core electrons than a 2p electron because it can spend more time near the nucleus as a result of the penetration.

Mathematical Expression:

v = \(\frac{-Zeff * e^{z} }{r^{2} }\)

ANSWER

The volume of the oxygen gas is 17.5 L

EXPLANATION

Given that;

The mass of oxygen gas is 12 grams

The temperature of the gas is 25 degrees Celcius

The pressure of the gas is 53 kPa

To find the volume of the oxygen gas, follow the steps below

Step 1; Assume the gas behaves like an ideal gas

Therefore, apply the ideal gas equation to find the volume of the gas

Where

P is the pressure of the gas

V is the volume of the gas

n is number of moles of the gas

R is the universal gas constant

T is the temperature of the gas

Step 2: Find the number of moles of the oxygen gas using the below formula

Recall, that the molar mass of the oxygen gas is 32 g/mol

Step 3; Convert the temperature to degree Kelvin

Step 4; Substitute the given data into the formula in step 1

Recall, that R is 8.314 L kPa K^-1 mol^-1

Hence, the volume of the oxygen gas is 17.5 L

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Answer:

Empirical formula

Explanation:

The empirical formula of a compound is the simplest whole number ratio of atoms of each element in the compound. It is determined using data from experiments and therefore empirical.

The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called chemical kinetics.

What is Energy?

Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.

The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called reaction kinetics. Reaction kinetics is the study of how fast chemical reactions occur and what factors affect the reaction rate. It takes into account factors such as the nature of the reactants, concentration, temperature, surface area, and the presence of a catalyst or inhibitor.

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Answer:

87.6 %

Explanation:

Step 1: Write the balanced equation

LiOH + KCl ⇒ LiCl + KOH

Step 2: Calculate the theoretical yield of LiCl

We will use the following relations:

The theoretical yield of LiCl from 20.0 g of LiOH is:

\(20.0gLiOH \times \frac{1molLiOH}{23.95gLiOH} \times \frac{1molLiCl}{1molLiOH} \times \frac{42.39gLiCl}{1molLiCl} = 35.4gLiCl\)

Step 3: Calculate the percent yield of LiCl.

We will use the following expression.

\(\%yield = \frac{real\ yield}{theoretical\ yield} \times 100\% = \frac{31.0g}{35.4g} \times 100\% = 87.6 \%\)

Answer:

88.6%

Explanation:

Hello,

In this case, considering the given reaction, we notice a 1:1 molar relationship between lithium hydroxide (molar mass=23.95 g/mol) and lithium chloride (molar mass=42.394 g/mol), for that reason, we are able to compute the theoretical yield of lithium chloride by stoichiometry:

\(m_{LiCl}^{theoretical}=20.0gLiOH*\frac{1molLiOH}{23.95gLiOH}*\frac{1molLiCl}{1molLiOH} *\frac{42.394 gLiCl}{1molLiCl}=35.4gLiCl\)

Next, by knowing the actual yield of 31.0 g, we compute the percent yield as:

\(Y=\frac{m_{LiCl}^{actual}}{m_{LiCl}^{theoretical}} *100\%=\frac{31.0g}{35.4g}*100\%\\ \\Y=87.6\%\)

Therefore, among the given, the answer should be 88.6%

Best regards.

The organ system has been defined as the collective working of the organs for performing a specified task. Each organ system has been assigned a major task to be performed.

The function of the following organ systems have been:

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Jared can use the entire 100 ft rope to complete the kite shape by placing the remaining stake at the center

To use the entire 100 ft rope to complete the , Jared can follow these steps:

1)Place the first stake at the center of the intended kite shape.

2)Measure a distance of 30 ft from the center stake in one direction and place a second stake at that point.

3)Measure a distance of 30 ft from the center stake in the opposite direction and place a third stake at that point.

4)Measure a distance of 20 ft from the center stake in the remaining two directions perpendicular to the first measurements, and place the fourth and fifth stakes at those points.

Finally, connect the stakes with the rope to form the complete kite shape.

The kite shape has two pairs of equal-length adjacent sides. In this case, the sides measured at 30 ft create one pair, while the sides measured at 20 ft create the other pair. This configuration allows Jared to use all of the 100 ft rope.

To visualize the shape:

By following this arrangement, Jared will use the entire length of the 100 ft rope to create the kite shape for the food vendors.

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Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

THANKS

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The glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

A chemical reaction involves the combination of two or more substances to yield a new substance which is different from the starting materials. It may also involve the break up a substance.

Since energy is required for a chemical reaction to take place, the glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Astronauts have to log at least 1000 hours flying a jet before applying to the astronaut candidate program. Therefore, option A is correct.

The astronaut candidate program is also known as the ASCAN program. It is a selection and training program conducted by NASA to prepare candidates for future space missions as astronauts.

The program typically involves rigorous physical and mental assessments, as well as training in a range of skills such as spacecraft systems, spacewalking, and robotics. The candidates who successfully complete the program are eligible to be assigned to a variety of space missions.

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Answer:

Inference  — The candle stayed lit longer because the plant gave off oxygen.

Observation — The candle went out when it was placed in a closed jar.

Observation — The candle stayed lit longer in closed jar when a plant was present.

Explanation:

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Joseph Priestley discovered the element oxygen which is most precious for living. He discovered the need of oxygen to respire and release by plants during photosynthesis.

Photosynthesis is the process of synthesis of glucose using carbon dioxide and water with the aid of light energy. The process makes energy for all the living organism in earth.

Plants uptake carbon dioxide and release oxygen during photosynthesis which makes oxygen abundant in the atmosphere.Thus, presence of plants give us air and remove carbon dioxide formed by respiration.

Priestley's conducted an experiment with a mouse placed in a closed jar and candle light inside. When the jar is close, there will be no air inside make the rat perish and candle light off. When he placed a plant inside the jar it released oxygen which made the rat alive a little longer.

Candle light stayed a lit longer by the presence of the plant. Thus option A is correct. Priestley concluded that buring needs oxygen.

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The number of element in No contains 1 element (Nobelium) and NO contains 2 elements ( 1 Nitrogen & 1 Oxygen )

An element is a substance that can not be damaged down right into a less complicated format. They're distinguished through a completely unique atomic range. The elements are organized by using their atomic range inside the periodic desk, which highlights elements with similar houses.

What are the forms of factors?

1) The factors are labeled as steel, non-steel, and metalloid.

2) The acute left facet factors within the periodic desk are metals, for     instance, sodium, calcium, caesium, and many others.

3) But, elements on the right facet are usually referred to as non-metals, carbon, chlorine, oxygen, and so on.

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Answer:

Explanation:

Here are the labels for each situation:

1.Usually conducts electricity & heat well - Metal (1)

2.At room temperature these are gases or liquids - Nonmetal (2)

3.Will lose valance electrons to form compounds - Metal (1)

4.Can be used as semiconductors - Metalloid (3)

5.Will gain valance electrons to form compounds - Nonmetal (2)

We have in this case a precipitation reaction. Initially the reactants used are soluble in water so they will be in the aqueous state. The water does not intervene in the reaction, it is simply the medium where the reaction takes place. Now, when these two reactants react, two compounds will be formed, one soluble and the other insoluble, which will precipitate in the water.

The reaction that will take place will be:

A compound will be formed that will precipitate in the water, this will be CaCO3 and a water-soluble salt, NaCl.

Answer:

B

Explanation:

Periodic refers to properties that repeat at certain intervals. Click to see full answer. In respect to this, what does periodic mean in the term periodic table? In the context of chemistry and the periodic table, periodicity refers to trends or recurring variations in element properties with increasing atomic number.

1) Volume of oxygen gas produced is 3.19 L ; 2) Volume of gaseous HF produced is 4.92 L ; 3) Pressure of gaseous O₂ produced is 10.0 atm. ; 4) Pressure of gaseous B₂H₆ produced is 6292 mm Hg.5) 34.6 grams of phosphoric acid reacted.

Molar mass can be defined the mass of one mole of substance.

1.) Molar mass of potassium chlorate (KClO₃) is: 39.098 g/mol + 35.453 g/mol + 3 * 15.999 g/mol = 122.549 g/mol

10.5 g KClO₃ * (1 mol KClO₃ / 122.549 g KClO₃) * (3 mol O₂ / 2 mol KClO₃) = 0.1281 mol O₂

As V = (nRT) / P

= (0.1281 * 0.08206 * (25.0 + 273.15) ) / 1.05

So V = 3.19 L

Therefore, the volume of oxygen gas produced is 3.19 L.

2.) Molar mass of calcium fluoride (CaF₂) is: 40.078 g/mol + 2 * 18.998 g/mol = 78.076 g/mol

8.5 g CaF₂ * (1 mol CaF₂ / 78.076 g CaF₂) * (2 mol HF / 1 mol CaF₂) = 0.2171 mol HF

V = (0.2171  * 0.08206 / * 292.15 ) / 1.124

V = 4.92 L

Therefore, volume of gaseous HF produced is 4.92 L.

3.) Molar mass of HgO = 200.59 g/mol

125 g HgO = 125/200.59 = 0.623 mol HgO

From the balanced equation, 2 moles of HgO produces 1 mole of O₂

Therefore, 0.623 mol HgO produces 0.3115 mol O₂

As P = nRT/V

= (0.3115 mol)(0.08206 )(394.15 )/(9.61 )

P = 10.0 atm

Therefore, pressure of gaseous O₂ produced is 10.0 atm.

4. Molar mass of NaBH₄ = 37.83 g/mol

25.0 g NaBH₄ = 25.0/37.83 = 0.661 mol NaBH4

From the balanced equation, 2 moles of NaBH₄ produces 1 mole of B₂H₆

Therefore, 0.661 mol NaBH₄ produces 0.3305 mol  B₂H₆

As P = nRT/V

= (0.3305 )(0.08206 )(289.15 )/(8.10 )

P = 8.29 atm

8.29 atm = 6292 mm Hg

Therefore, pressure of gaseous  B₂H₆ produced is 6292 mm Hg.

5.) As n = PV/RT

n = (1.00 )(24.3 )/(0.0821 )(273 ) = 1.06 mol CO₂

1.06 mol CO₂ × (1 mol H₃PO₄/3 mol CO2) = 0.353 mol H₃PO₄

Molar mass of H₃PO₄ is 98.0 g/mol; so 0.353 mol H₃PO₄ × (98.0 g H₃PO₄/mol) = 34.6 g H₃PO₄

Therefore, 34.6 grams of phosphoric acid reacted.

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The oxidation state of nitrogen (N) in NaNO3 is +5. option B

To determine the oxidation state of nitrogen (N) in sodium nitrate (NaNO3), we need to assign oxidation numbers to each element in the compound.

In NaNO3, we know that the sodium ion (Na+) has a +1 oxidation state because it is an alkali metal. Oxygen (O) typically has an oxidation state of -2 in compounds, and there are three oxygen atoms in NaNO3. Since the compound is neutral, the sum of the oxidation states must be zero.

Let's assume that the oxidation state of nitrogen is x. Therefore, we can set up the equation:

(+1) + x + (-2) * 3 = 0

Simplifying the equation:

+1 + x - 6 = 0

x - 5 = 0

x = +5

Therefore, the oxidation state of nitrogen (N) in NaNO3 is +5.

The oxidation state of an element indicates the number of electrons it has gained or lost in a compound. In this case, the nitrogen atom in NaNO3 has gained five electrons to achieve a stable oxidation state of +5.

It is important to note that oxidation states are formal charges and do not necessarily represent the actual distribution of electrons in a compound. They are assigned based on a set of rules and can be useful in understanding the reactivity and behavior of elements in chemical reactions.

Option B

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The name "sodium carbonate" refers to the chemical formula Na2CO3, which consists of two sodium ions (Na+)

The compound Na2CO3•4H2O is called sodium carbonate decahydrate. It is a hydrate compound, indicating that it contains water molecules within its crystal structure. In this case, there are four water molecules associated with each molecule of sodium carbonate.

The name "sodium carbonate" refers to the chemical formula Na2CO3, which consists of two sodium ions (Na+) and one carbonate ion (CO3^2-). The "decahydrate" part of the name indicates the presence of ten water molecules (H2O) in the compound.

When sodium carbonate decahydrate is formed, each sodium carbonate molecule associates with four water molecules, resulting in the formula Na2CO3•4H2O. The water molecules are not chemically bonded to the sodium carbonate but rather held within the crystal lattice through weak intermolecular forces.

Sodium carbonate decahydrate is commonly known as soda ash or washing soda. It is used in various applications such as water treatment, glass manufacturing, detergent production, and pH regulation in swimming pools.

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Answer:

Let's find out time using musically to we not less X elation times T um Sylvia 120 kilometer are and be known to get 70-kilometer bar are jobless acceleration. Relax. The relation is six housing kilometers where R squared times D and solving 40 t is equal to one divided by 120 hours which is equal to 32nd. Let's find a distance traveled using s is equal to a snot. Let's be not times de lis. How 50 square off 80 Um, A. Sees the exploration of car Times T's were no, that's like in numbers. So a distance is equal to 70 uh, kilometer, but are into one divided by 120 hard is less, one divided by two into x elation of God. It is a 6000-kilometer bar are square, are in duty square will t swear. He's one divided by 120 holes where so t is equal to 0.79 kilometers

Explanation: