what does it mean to be accurate?

Answer:

A. True

Explanation:

many over-the-counter (OTC) drugs that can be abused and even habit-forming, with potentially life-threatening consequences.

Answer:

True

Explanation:

Anything is dangerous if used the wrong way

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

Ca(OH)2 is the base and CaCl2 is the salt

Explanation:

i think this is the answer because calcium hydroxide has hydroxide ions as the only positively charged ion and calcium chloride is a salt.

I hope this helps

The chemical equation for the formation of calcium chloride has Ca(OH)₂ as the base and CaCl₂ as the salt. Hence, option A is correct.

Salt is given as the neutral compound with the presence of the acidic and the basic constituents. The salt can be formed as a result of the neutralization reaction of acid and base.

The acids are comprised of the presence of the hydrogen ion, and the base comprises the presence of the hydroxide ions. Thus, in the given reaction, Ca(OH)₂ is the base and CaCl₂ is the salt. Hence, option A is correct.

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Answer:

Compound

Explanation:

SiO2 is silicon dioxide which is a compound.

Answer:

Explanation:

In the attached file , the resonance structure of amide and ester has been given . One can find that due to oxygen being more electronegative than nitrogen , the contribution of second resonance structure is more . Hence the double bond character of carbonyl bond ( =C=O ) as double bond is less . It is more in the form of single bond . ( see the resonance structure )

On the other hand it is not so in ester because of absence of nitrogen atom. Here carbonyl group is more in the form of double bond . The stretching wave number for double bond is more because it has greater energy .

Answer:

2.64 grams

Explanation:

Concentration = moles / volume of solution

So

moles = concentration (moles/liter)  X  volume of solution (liters)

30mL = 0.030 L

moles = 2.2 (moles/liter)   X   0.030 (liter)   notice the liters cancel out

moles = 0.066 moles

Mass of sodium hydroxide is 40 grams/mole

grams of NaOH = 0.066 moles x  40 grams/mole  (the moles cancel out)

grams of NaOH = 2.64 grams

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Out of the options given, the expression that represents the ideal gas behavior is:

The ideal gas law is expressed by the formula PV = nRT,

where

P is the pressure,

V is the volume,

n is the number of moles of gas,

R is the gas constant, and

T is the temperature.

By rearranging this equation, we can derive different expressions for the ideal gas behavior in terms of the pressure, volume, and temperature.

This can be obtained by rearranging the ideal gas law equation as follows:

PV = nRT

Dividing both sides by nT, we get:

P × V / (nT) = R

Since R is a constant for a given gas, the left-hand side of the equation must also be constant for an ideal gas. Thus, the expression P × V / T represents the ideal gas behavior.

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The reverse of a mathematical method used to determine the pH can be used to determine the hydronium concentration from the pH. or [H3O+] = antilog, or [H3O+] = 10-pH (- pH).

In fact, the logarithmic indicator of the presence of hydrogen ions in a solution is pH. A acidity increase of 1 corresponds to a 10x increase in the concentration of H+ ions because pH is calculated on a log scale.

pH stands for "Potential of Hydrogen" in its full form. A negative logarithm of the concentration of H+ ions is known as pH. As a result, the meaning of pH is defined as the strength or power of hydrogen.

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Answer:

A and 3

B and 2

C and 1

Explanation:

Ionic bonding is the transfer of electrons from a cation to an anion.

Covalent bonding is the sharing of electrons between nonmetal atoms.

Metallic bonding is the sea of electrons metal cations.

Hope this helped!

At 25 degrees Celsius, with 50g of sugar, the solution will appear clear and homogeneous, with all the sugar dissolved. The ratio of dissolved sugar to undissolved sugar will be 50:0, as all the sugar has dissolved.

If an additional 55g of sugar is added to the 25-degree water, the solution will become supersaturated. This means that the water cannot dissolve all the sugar, resulting in the excess sugar remaining undissolved as solid particles at the bottom of the container. The solution will appear cloudy, and the ratio of dissolved sugar to undissolved sugar will be 50:5, as only 50g of the added sugar can dissolve.

When the solution is heated, the solubility of sugar increases. As a result, more sugar will dissolve, and the solution will become clear again. The ratio of dissolved sugar to undissolved sugar will approach 105:0 as the temperature increases and more sugar dissolves.

If the heated solution is slowly cooled back to 25 degrees Celsius, the solubility of sugar decreases. This will cause the excess sugar to come out of the solution and form solid crystals, which will be visible as sugar particles. The solution will appear cloudy again, and the ratio of dissolved sugar to undissolved sugar will depend on the amount of sugar that remains dissolved after cooling.

Adding a seed crystal to the mixture provides a surface for sugar crystals to form, resulting in the rapid crystallization of the remaining dissolved sugar. The solution will become saturated with sugar crystals, and the ratio of dissolved sugar to undissolved sugar will be close to 0:55, as most of the sugar will have crystallized. The solution will appear cloudy with a significant amount of sugar crystals present.

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Answer:

The concentration of dye in solution C is 3.02 M.

Explanation:

To find the concentration of dye in solution C we need to use the following equation:

\( V_{1}C_{1} = V_{2}C_{2} \)

Where V is for volume and C is for concentration

In the first dilution we have:

\( V_{A}C_{A} = V_{T}C_{B} \)

\( 2 mL*23.5 M = (2 mL + 12 mL)*C_{B} \)                              

\( C_{B} = 3.36 M \)

Now, in the second dilution:

\( V_{B}C_{B} = V_{T}C_{C} \)

\( 9 mL*3.36 M = (9 mL + 1 mL)*C_{C} \)  

\( C_{C} = 3.02 M \)                        

Therefore, the concentration of dye in solution C is 3.02 M.

I hope it helps you!                                        

Answer:

lungs

Explanation:

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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If the efficiency of a machine increases, it means that the machine is able to convert a higher percentage of its input energy into useful work output.

This could happen due to various factors, such as reducing friction, improving the design of the machine, or using more efficient components. The machine requires less energy input to perform the same amount of work. This could result in cost savings, reduced energy consumption, and lower environmental impact.

The output of the machine increases while the input remains constant. This could result in increased productivity, faster production rates, and improved performance. The wear and tear on the machine may decrease, as it is working more efficiently and experiencing less stress. This could result in longer machine life and reduced maintenance costs. Increasing the efficiency of a machine can have many positive effects, including cost savings, improved performance, and reduced environmental impact.

The complete question is

If the efficiency of a machine increases, what happen?

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Answer:

C3H8 + 5O2 = 3Co2 + 4 H2o

Explanation:

we can balance this equation by algebric method ( ABC method)

Answer:

The balanced equation for barium reacting with aqueous aluminum nitrate can be written as:

Ba + 2 Al(NO3)3 → Ba(NO3)2 + 2 Al

(Note: state symbols indicate the physical state of each substance in the reaction. In this case, "Ba" and "Al" are solids, while "Al(NO3)3" and "Ba(NO3)2" are aqueous solutions.)

The number of moles of AgCl formed during the reaction is 0.0125 mol.

Given the reaction:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)We are supposed to determine the moles of solid AgCl formed when 50.0 ml of 0.250 M AgNO3 reacts with excess MgCl2 and in the previous step, we found that 0.0125 mol of AgNO3 reacts.

We can use the stoichiometry method to find the moles of AgCl formed.

To do so, we will have to balance the given chemical equation and find out the number of moles of AgCl formed from the given reactants.

The balanced chemical equation is:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)From the equation, we can say that 2 moles of AgCl form from 2 moles of AgNO3 reacted.

In the previous step, we have found the number of moles of AgNO3 reacted, which is 0.0125 mol.

As per the balanced chemical equation, 2 moles of AgCl form from 2 moles of AgNO3 reacted.

Therefore, the number of moles of AgCl formed = (0.0125 mol AgNO3 reacted × 2 moles AgCl / 2 moles AgNO3) = 0.0125 mol AgCl.

The number of moles of AgCl formed during the reaction is 0.0125 mol.

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Taking into account the ideal gas law, there are 182.93 moles of gas in a 15 L scuba canister if the temperature of the canister is 200 K and the pressure is 200 atm.

An ideal gas is called a hypothetical or theoretical gas, which is composed of particles that move randomly and without interacting with each other.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law. This equation relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar gas constant:

P×V = n×R×T

You know:

Replacing in the ideal gas law:

200 atm× 15 L = n× 0.082 (atmL)÷(molK)× 200 K

Solving:

(200 atm× 15 L) ÷ (0.082 (atmL)÷(molK)× 200 K)= n

182.93 moles= n

Finallt, there are 182.93 moles of gas.

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Answer:

No, your missing some bonds

Answer:

a penny that has turned green

Explanation:

a chemical change is when a substance combines with another to form a new substance. the other answer choices doesn't form a new substance.

Answer:

A would be the correct answer

Explanation:

look at the pic

Answer:

a. The carbon-carbon bond in ethane's the longest!)

Explanation:

Ethane is a chemical compound that is organic in nature. Its chemical formula is \($C_2H_6$\). It has two carbon atoms and six of hydrogen atoms that is connected to the carbon atoms.

Ethane is odorless and colorless at the standard temperature and standard pressure.

The carbon to carbon atoms in ethane is connected by a single bond.

The length of single carbon-carbon bond is greater than carbon-carbon double bond and triple bond.

Thus, carbon-carbon bond length in ethane is the longest.

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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Answer:

density = 0.669 but see below.

Explanation:

Mass of Beaker and the liquid = 53.25

Mass of just the beaker =           36.52       Subtract

Mass of the liquid                         16.73

Density =  mass / volume

mass =         16.73

volume =    25.0 mL

You have to assume that the pipette was filled right to the top.

Density = 16.73 / 25.0 = 0.6692 grams / mL

Since this only has 3 places of accuracy, the answer should be 0.669