Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table.



Which of the following best describes property X?

The pH of a 0.380 M aqueous solution of HF is 1.79

The pH of a 0.040 M aqueous solution of HF is 2.28

The pH of a solution is the negative logarithm to based 10 of the hydrogen ion concentration of a solution.

The pH of a weak acid solution is related to its Ka by the Henderson-Hasselbalch equation.

The expression for the the Ka of hydrofluoric acid is given below:

Ka = [H⁺] * [F⁻] / [HF]

The Ka of HF = 6.8 x 10⁻⁴

To find the pH of the given solutions of HF; we assume at equilibrium that the change in the concentration is very small.

Let [H⁺] and  [F⁻] be x respectively at equilibrium

Therefore, the equation above simplifies to:

Ka = x² / [HF]

x = √Ka * [HF]

(a) The pH of a 0.380 M aqueous solution of HF will be

x = √(6.8 x 10⁻⁴ * 0.38)

x = 0.016

[H⁺] = 0.016

pH = 1.79

(b) The pH of a 0.040 M aqueous solution of HF will be

x = √(6.8 x 10⁻⁴ * 0.040)

x = 0.0052

[H⁺] = 0.0052

pH = 2.28

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The hydrated salts which is used to remove permanent hardness in water is Na₂CO3.10H₂O.

Therefore, Na₂CO3.10H₂O is used to remove permanent hardness in water.

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Answer:there are four types they are oil,natural gas,coal, and nuclear energy

Explanation:

A siren pitch increases as it approaches us, as according to Doppler effect  pitch depends on the frequency of the sound wave. A high frequency corresponds to a high pitch, so when the siren approaches us the observed frequency increases and our ears hears a higher pitch as siren produces waves of constant frequency as it approaches us .

We know,

Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.

According to Doppler effect, frequency of sound, light or other waves increases due to relative motion between wave source and observer. The frequency increases if the source and the observer move towards each other and vice-versa.

Since the observed frequency increases when the siren produced waves of constant frequency our ears hears a higher pitch as it approaches us.

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The balanced chemical equation is O₂ (g) + C (s) → CO₂ (g).

The chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic.

When carbon combines with oxygen gas to generate carbon dioxide gas, the balanced equation is as follows:

O₂ (g) + C (s) → CO₂ (g)

While oxygen is a gas and has the chemical symbol O, carbon is a solid element with the symbol C.

Carbon dioxide gas is created when carbon combines with oxygen gas as follows:

O₂ (g) + C (s) → CO₂ (g)

According to the equation above, each element in the equation has an equal amount of atoms, hence the equation is said to be balanced.

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Answer:

that they are neither created or destroyed

1.0 x 10^19 many photons are emitted by the lightbulb each second.

Assume that 8.0% of the energy output of a 65 watt light bulb is visible light

Total energy = 65 x 8/100 = 5.2 watt light is visible light

One watt (W) is equal to 1 J/s

So, 5.2 watt = 5.2 J/s

Energy carried by one 550nm photon –

Use the relation between energy and wavelength

E photon = h c / lambda

= (6.63 x 10^-34 J s) x (3.00 x 10^8 m/s)/ 550 x 10^-9 m

= 3.62 x 10^-19 J

So how many of these photons will we need to make 3.5 Joules?

Assume we require N of them in total. Then,

3.5 Joules = N x 3.62 x 10^-19 J

N = 3.5 J / 3.62 x 10^-19 J

  = 9.67 x 10^18

So, in order to emit 3.5 Joules per second, the lightbulb must emit 9.67 x 10^18 photons per second

If 5.9 % of the energy of 65 watt light is visible light

Total energy = 65 x 5.9/100 = 3.835 watt light is visible light

3.835 watt = 3.835 J/s

So how many of these photons will we need to make  3.835 Joules?

Let's assume we need some number N of them. Then,

3.835 Joules = N x 3.62 x 10^-19 J

N = 3.85 J / 3.62 x 10^-19 J = 1.0 x 10^19

So, in order to emit 4.43 Joules per second, the lightbulb must emit 1.0 x 10^19 photons per second

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Compounds of bromine that conduct electricity are ionic compounds whereas compounds of bromine that never conduct electricity are covalent in nature.

Compounds are substances which are composed of two or more elements chemically combined together.

Compounds may be covalent in nature or ionic in nature depending on the nature of the type of bonds present in the compounds.

Compounds that are formed by compounds with large electronegativity differences contain ionic bonds, as these elements form ions.

Ionic compounds conduct electricity in either molten or solution form. Examples of ionic compounds are sodium bromide, calcium bromide, etc.

Compounds that are formed by compounds with very small or no electronegativity differences contain covalent bonds, and  these elements form molecules.

Covalent compounds do not conduct electricity in either molten or solution form. Examples of covalent compounds are hydrogen bromide, bromine trifluoride, etc.

In conclusion, bromide compounds may be covalent or ionic.

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66.15 grams of mercury are present in a barometer that holds 4.9 mL of mercury.

To calculate grams of mercury

Given data,

volume = 4.9 ml

density of mercury = 13.5 g/mL

weight = ?

Using formula,

weight of mercury = density of mercury x volume of mercury

weight of mercury = 13.5 g/mL x 4.9 mL

weight of mercury = 66.15g

An instrument widely recognized as a barometer is used to measure the air pressure in a specific environment. Weather changes in the short term can be predicted by pressure tendency. Surface weather analysis uses a variety of air pressure measurements to help identify surface troughs, pressure systems, and frontal boundaries.

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Plate boundaries can move as fast as 1 cm to over 10 cm per year and the scientists figure out how fast they go and which directions do they go through the use of GPS.

This is referred to as Global positioning system and it contains different types of satellites which makes it easier to determine the ground position of different types of objects such as plate boundaries, rocks etc.

This system sends highly accurate navigation pulses to users thereby ensuring that the exact position is gotten and in the case of the plate tectonics people use it to determine the extent of movement within a given period of time.

Plate tectonics move slowly which varies and is usually between  1 cm to over 10 cm per year thereby making it the most appropriate choice.

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Answer:

Nitrogen atoms and hydrogen atoms in ammonia are held together by covalent bonds.

Explanation:

Answer:

nucleus

Explanation:

It is an electron

Explanation:

to prepare it you would a quantity of 300ml of distilled water to a volumetric flask I think?

Considering the definition of percentage by mass, the mass of a calcium chloride solution is 64.49 grams.

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

percentage by mass= (mass of solute÷ mass of solution)× 100

In this case, you know:

Replacing in the definition of percentage by mass:

24.5= (15.8 g÷ mass of solution)× 100

Solving:

24.5÷ 100= 15.8 g÷ mass of solution

0.245= 15.8 g÷ mass of solution

0.245× mass of solution= 15.8 g

mass of solution= 15.8 g÷ 0.245

mass of solution= 64.49 grams

Finally, the mass of a calcium chloride solution is 64.49 grams.

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The percentage yield of Li₃N is 28.63 %.

6Li(s)   + N₂ (g)   →  2 Li₃N (s)  

According to balanced reaction

6 x 6.94 g Li reacts  with  28 g N₂

12.8 g Li  reacts  with  12.8 x 28 / 6 x 6.94  = 8.61 g N2

But we have 34.9 g N₂.  so N₂  present in excess

Limiting reagent = Li

6 x 6.94 g Li gives 2 x 34.83  g Li₃N

12.8 g Li  gives  12.8 x 2 x 34.83  / 6 x 6.94   = 21.41 g Li3N

Actual yield = 6.13 g

Theoretical yield = 21.41 g

% yield = (actual yield / theoretical yield) x 100

% yield  = (6.13 / 21.41) x 100

% yield = 28.63 %

Percentage yield is the percentage ratio of real yield to the theoretical yield. It's miles calculated to be the experimental yield divided through theoretical yield increased by a 100%. If the actual and theoretical yield ​are the equal, the percent yield is one 100%.

Percentage yield is the range calculated indicating the difference in percentage among the theoretical yield and real yield of an experiment. Whilst experimenting with unique solutions or inside the manufacturing of chemical solutions you have got by means of-merchandise and the real meant products.

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Answer:

neutron

electron

13

atomic number/proton number

(answers are in order)

The maximum mass of Sg that can be produced by combining 90.0 g of each reactant is 130g. It is due to the reason that the H2S is limiting agent and thus limits the amount of product that can be produced.

8 SO₂ + 16H₂S ==> 3Sg+ 16H₂O

According to this, 3 moles of S8 will be created when 8 moles of SO2 and 16 moles of H2S are combined. To calculate the maximum quantity of S8 that can be created, we must figure out how many moles of SO2 and H2S are actually present throughout this process. Which reactant, in other words, is contained in the limited supply? Let's look at the balanced equation:

8SO2 + 16H2S ==> 3S8 + 16H2O

For SO2:  92.0 g SO2 x 1 mol SO2/64.1g x 3 mol S8/8 mol H2S x 257 g S8/mol S8 = 138 g S8 formed

For H2S:  92.0 g H2S x 1 mol H2S/34.1 g x 3 mol S8/16 mol H2S x 257 g S8/mol S8 = 130. g S8 formed

So, the maximum amount of S8 that can be formed would be 130g.

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The enthalpy of the following system can be increased by increasing the temperature. So, the correct option is (c).

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.

The kinetic and potential energy of the atoms and molecules in a system rise as the system's temperature rises. As a result, the system's internal energy rises, which also raises its enthalpy. This is true whether the system is under constant pressure or volume.

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A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mas / volume percent 10.99 % (w/v).

The soft drink ( classic coke ) contains sugar = 39.0 g

volume = 12 ounce

Mass/Volume percent = (mass of solute (g) / volume of solution (ml))×100

mass of solute = 39.0 g

volume of solution = 12 ounce

1 fluid ounce = 29.57 ml

volume of solution in ml = 12 × 29.57 ml = 354.84 ml

therefore ,

mass / volume % = (39.0 / 354.84 ) × 100 % (w/v)

                            = 10.99 % (w/v)

Thus,A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mass / volume percent is 10.99 %(w/v)

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The student's absolute error, given the data from the question is 0.09 mL

We'll begin by obtainig the volume of the water the student measured. This can be obtained as follow:

Density = mass / volume

Thus,

Volume = mass / density

Volume of water = 30 / 0.997

Volume of water = 30.09 mL

The absolute error can be obatined as illustrated below:

Absolute error = Measured value - accepted value

Absolute error = 30.09 - 30

Absolute error = 0.09 mL

Thue, the student's absolute error is 0.09 mL

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The concentration of the base is 0.162 M

We know that neutralization is a reaction in which  an acid is reacted with a base to yield salt and water only. The first step is to write down the equation of the reaction as follows;

[tex]NaOH + HCl ----- > NaCl +H_{2} O[/tex]

Now using the formula;

CAVA/CBVB = NA/NB

CA = concentration of acid

CB = concentration of base

VA = volume of acid

VB = volume of base

NA = number of moles of acid

NB = number of moles of base

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0.250 M * 22.7 mL * 1/35.0 mL  * 1

CB = 0.162 M

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According to Avogadro’s law, the three balloons, although have different gases, have the same volume.

Avogadro’s law states that gas molecules at STP occupy 22.4L volume.

According to Avogadro's law, all gases have the same molar volumes at a certain temperature and pressure. As a result, even if we are unsure of the type of gas we are working with, we can still determine how much material is there.

According to Avogadro's law, if we double the volume by a certain factor, let's say x, we must likewise multiply the substance amount by x. This kind of connection is referred to as direct proportionality and can be formally stated as V ∝ n.

At Standard Temperature and Pressure (STP), i.e., 0℃ and 1atm pressure, gases like hydrogen, oxygen and carbon dioxide have a molar volume of 22.4L.

Avogadro’s law suggests that equal volumes of gases contain equal number of molecules at STP.

Therefore, 1 mol of [tex]O_2[/tex] = 1 mol of [tex]H_2[/tex] = 1 mol of [tex]CO_2[/tex] = 22.4L

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The statements a b c and d are false. Option B

The term redox reaction refers to a type of reaction in which there is a simultaneous oxidation and reduction of species in the reaction. This implies that one specie accepts electrons and one specie losses electrons. The whole process occurs simultaneously in the reaction.

If wee look at the reaction we can see that chloride ion was oxidized to chlorine gas and the chromate VI was reduced to chromate III. the oxidation number of hydrogen and oxygen remained the same on both sides hence the statements a b c and d are false. Option B

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The significant figure in the numbers are as follows:

Significant figures refers to digits which are non-zeroes found in a given number. Also, if zeroes are found between non-zero digits, the zeroes are counted as significant numbers.

The number of non-zero digits gives the number of significant figures in a number.

Significant figures are used in approximating values to determine to how many places the digits in a number are significant.

Considering the given numbers:

A) 1.06 s has 3 sig figs

B) 5003 mL has 4 sig figs

C) 10890 kg has 4 sig figs

D) 50 students has 1 sig figs

E) 0.00001 m has 1 sig figs

F) 100.0 cm² has 1 sig figs

G) 0.00800 s has 1 sig figs

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The gas must be transported in upright position and the engineer must avoid excessively shaking the cylinder.

We know that a gas must be transported under pressure. This implies that the gas is subjected to a very high magnitude of pressure so that the gas is liquefied. The liquefied gas is at very high pressure and we would need to make use of a pressure device in order to be able to effectively transport the gas. We must not forget that the transport of a gas under pressure is a very risky affair. As the gas is being transported, care must be taken to ensure that excessive pressure is not put on the cylinders as this could lead to an explosion and potential fires if the gas is inflammable.

Nitrogen must be transported under pressure. Sometimes, we can not lay hands on the required pressure vessels for transporting compressed gas. In that case, the gas must be transported in upright position and the engineer must avoid excessively shaking the cylinder.

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Answer:1.14 10x^-4

Explanation: