which list contains only strong acids? (5 points) a. hcl, hno3, hf, hclo4 b. h2so4, h3po4, hclo4, nh3 c. hno3, h2so4, naoh, h3po4 d. hcl, hno3, h3po4, hclo4 e. hcl, h2so4, hclo4, hi

Answer:

chưa hiểu đáp ánkia cho lắm. Nhưng đáp án là ZnO nha

Explanation:

The statement among the available options that describes the result of the study is that less than 50% of the people never felt phantom pain. Option 2.

In order to interpret the data and find the best description of the outcome of the experiment, the response needs to be grouped into 2 from the 3 available responses.

Since those that phantom pain sometimes and always belong to the same category, the respondents can be summed up into one:

Number of those that sometimes feel phantom pain = 534

Number of those that always feel phantom pain = 193

Total number of people that feel phantom pain = 534 + 193

                                                                                = 727 people

Number of people that never feel phantom pain = 183

Total number of respondents in the experiment = 183 + 534 + 193

                                                                                = 910 people

Percentage of respondents that felt phantom pain = 727/910 x 100

                                                                                     = 79.89%

Percentage of people that never felt phantom pain = 183/910 x 100

                                                                                      = 20.11%

Percentage of people that felt phantom pain all the time = 193/910 x 100

                                                                                      = 21.21%

Thus, the statement that correctly describes the outcome of the experiment of all the statements is that less than 50% never felt phantom pain.

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The empirical formula for lead arsenate is PbHAsO4.

To find the empirical formula for lead arsenate, we need to determine the ratio of the number of atoms of each element in the compound.

First, we need to convert the mass of each element to the number of moles using the atomic masses:

moles of lead (Pb) = 1.3813 g / 207.2 g/mol = 0.006660 mol

moles of hydrogen (H) = 0.00672 g / 1.008 g/mol = 0.00667 mol

moles of arsenic (As) = 0.4995 g / 74.92 g/mol = 0.00667 mol

moles of oxygen (O) = 0.4267 g / 15.999 g/mol = 0.02667 mol

Next, we need to find the smallest mole value and use it as the denominator to get the mole ratio of the elements. In this case, the smallest mole value is 0.00666 mol:

Pb: 0.006660 mol / 0.00666 mol ≈ 1

H: 0.00667 mol / 0.00666 mol ≈ 1

As: 0.00667 mol / 0.00666 mol ≈ 1

O: 0.02667 mol / 0.00666 mol ≈ 4

empirical formula = PbHAsO4.

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Answer:

The correct options are;

C. Divergent plate boundary

D. Normal faults

Explanation:

Tensile stress tends to pull objects part by acting axially upon the object to pull the object on a cross section perpendicular to the objects cross-section

The most common stress in convergent plate boundaries is compression stress

The most common stress in divergent plate boundaries is tensile stress

In the presence of tensile stress, normal faults results in the raising of mountains due to their enormous forces

Therefore, the features of Earth's crust involving tension are divergent plate boundary and normal faults.

Answer:c and d

Explanation:

Answer: C.  Waves don't move matter, just energy.

Explanation:

In the periodic table, each element is assigned a unique chemical symbol which is characteristic of it's own and hence there is no other element with symbol Cr except chromium in the periodic table.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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To calculate the percent error in your measurement data, you can use the following formula Percent Error = (|Experimental Value - Accepted Value| / Accepted Value) × 100.

In this case, the experimental value is 5.67 mL, and the accepted value is 5.17 mL.

Let's plug in the values into the formula:

Percent Error = (|5.67 mL - 5.17 mL| / 5.17 mL) × 100

Now let's calculate the numerator:

|5.67 mL - 5.17 mL| = 0.5 mL

Now we can substitute this value into the formula:

Percent Error = (0.5 mL / 5.17 mL) × 100

Calculating the division:

Percent Error = 0.0966 × 100

Percent Error = 9.66%

Therefore, the percent error in your measurement data is approximately 9.66%.

The existence or absence of a genuine zero point, which impacts the types of calculations that may be done with the data, is the primary distinction between data measured on a ratio scale and data recorded on an interval scale.

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Answer:

Part 1 calcium and strontium have same properties as magnesium because all three are in same group.

Part 2 As atomic number of potassium is 19 so it contains 19 protons and 19 electrons because it is neutral

Potassium has 20 neutrons because its mass is 39

We can find neutron = atomic mass - atomic number

Explanation:

Answer:

87.5198

Explanation:

(43.65 * 87.05) + (48.25 * 87.93) + (8.11 * 87.50) = 8751.98

8751.98 / 100 = 87.5198

397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

One carbon atom makes up the molecule methane(CH4), which has four hydrogen atoms bound to the carbon by single bonds. It is a odorless, colorless, non-toxic, flammable gas and has a melting point of -161°C. CH4 performs three functions: fossil fuel, greenhouse gas, and bacterial metabolite.

For calculating the  bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

do as follows.

heat of atomization of solid carbon =170.9kcal

and heat of atomization of four gaseous hydrogen is =4 × 52.1kcal

So, energy for breaking four carbon-hydrogen bonds

= 170.9 + (4 × 52.1) + 17.9 = 397.2 kcal.

Hence, 397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4

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Answer:

The mass of each gas present in the 1.35 L sample of the mixture at 25.0 °C.

Explanation:

a) To obtain the total pressure of the gas mixture, we simply sum up the partial pressures of each gas.

Total pressure = Partial pressure of N2 + Partial pressure of O2 + Partial pressure of He

Total pressure = 236 torr + 137 torr + 147 torr

Total pressure = 520 torr

Therefore, the total pressure of the gas mixture is 520 torr.

b) To calculate the mass of each gas in the mixture, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Volume (V) = 1.35 L

Temperature (T) = 25.0 °C = 25.0 + 273.15 = 298.15 K

Calculate the number of moles of each gas using the ideal gas law:For N2:

Partial pressure of N2 = 236 torr

Using PV = nRT, we can rearrange the equation to solve for n (number of moles):

n = (P * V) / (R * T)n(N2)

= (236 torr * 1.35 L) / (0.0821 L·atm/mol·K * 298.15 K)

Repeat this calculation for O2 and He using their respective partial pressures.

Convert moles to grams using the molar masses of each gas:

Molar mass of N2 = 28.0134 g/mol

Molar mass of O2 = 31.9988 g/mol

Molar mass of He = 4.0026 g/molMass

(N2) = n(N2) * molar mass(N2)

Mass(O2) = n(O2) * molar mass(O2)

Mass(He) = n(He) * molar mass(He)

Perform these calculations for each gas.After performing the calculations, you will obtain the mass of each gas present in the 1.35 L sample of the mixture at 25.0 °C.

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Answer:

8,920,000

Explanation:

Answer:8,200,000

Explanation:

Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

Hope that helps

Long polymers made of monosaccharides that have been linked through dehydration reactions are called polysaccharides.

Monosaccharides are known as simple sugars

Monosaccharides can be linked together by dehydration reactions to form long polymeric chains.

The long polymers are known as polysaccharides.

Therefore, long polymers made of monosaccharides that have been linked through dehydration reactions are called polysaccharides.

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In the chemical equation of aluminium nitrate and sulfuric acid limiting reactant is sulfuric acid as it is present in small quantity.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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The volume of the glycerol sample is 36.4 mL.

To calculate the volume of a substance, we can use the formula:

Volume = Mass / Density.

Given that the mass of the glycerol sample is 43.7 g and the density is 1.20 g/mL, we can substitute these values into the formula:

Volume = Mass / Density

Volume = 43.7 g / 1.20 g/mL

Volume = 36.4 mL

In this calculation, we use the formula Volume = Mass / Density, where the mass is given in grams and the density is expressed in grams per milliliter. Dividing the mass by the density gives us the volume in milliliters, as density is defined as mass per unit volume.

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That solution of a compound which when dissolved in water conducts electricity, turns litmus red, and has a sour taste is C3H5(COOH)3 ( carboxylic acid ).

Carboxylic acid is can conduct electricity, turns blue litmus paper to red color and also has sour taste simply because it is a an acid; specifically, a weak acid. This is because when it dissolves in water, some of it hydrogen ions ionizes partially to produce positively charged hydrogen ions.

However, acid can be defined as a substance which when dissolved in water produces hydrogen ions as the only positive ions. All acids have sour taste, are corrosive when highly concentrated, turns blue litmus paper red and so on and so forth.

In conclusion, we can therefore conclude that carboxylic acid is a weak acid and also has characteristic properties of acids.

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Answer:

They are multilayered

Spacesuits provide protection from radiation and offer normal air pressure inside

Explanation:

(a). The concentration of the compound after 2.5 h is 0.45mg/100mL.

(b). The person with the fever must wait 7.4 h to take the next pill and 14 h to take the third pill.

(c). The activation energy is 134.5 kJ/mol.

(a). First, let's calculate the rate constant, k. The half-life is given as 90 min.

For a first-order reaction, the half-life is given as:

t1/2 = (0.693/k)

Rearranging, we get:

k = (0.693/t1/2)

Substituting the values:

k = (0.693/90)

k = 7.7×10⁻³/min.

Now, let's use the equation for the first-order rate law for the decomposition of aspirin in blood:

C = C₀e−kt

Where:

C₀ is the concentration of the compound initially.

C is the concentration of the compound at any given time t.

e is the mathematical constant approximately equal to 2.71828.

t is the time elapsed.

Substituting the values:

C = 2mg/100mL

C₀ = 0.60g/(2 tablets×100)

    = 0.003g/mL

     = 3mg/ mL

Thus:

C = 3×2.71828−7.7×10−3×30

   = 1.9mg/100mL

We want to calculate the concentration after 2.5 hours. 2.5 hours is 150 min.

Thus:

C = 2mg/100mL×2.71828−7.7×10⁻³×150

  =0.45mg/100mL

(b). We can calculate the rate constant for both normal temperature and fever temperature, k₁ and k₂, respectively:

k₁ = 3.1 × 10⁻⁵ s⁻¹

k₂ = 3.9 × 10⁻⁵ s⁻¹

To find out how long the person with the fever should wait before taking the next pill, we can use the equation for the first-order rate law:

N/N₀ = e−kt

Where:

N₀ is the initial number of molecules.

N is the number of molecules at any given time t.

e is the mathematical constant approximately equal to 2.71828.

t is the time elapsed.

We know that the person with the fever should wait for 32 of the first pill to decompose.

Thus,

N/N₀ = 0.68.

Substituting the values for k₂:

N/N₀ = e−3.9×10−5 tln(0.68)

        = −3.9×10−5 tln(1)−ln(0.68)

        = −3.9×10−5 t

Thus, t = 7.4 hours.

Similarly, we can find the time for the third pill. If the first pill has decomposed by 64, then N/N₀ = 0.32.

Substituting the values for k₂:

N/N₀ = e−3.9×10⁻⁵ tln(0.32)

        =−3.9×10⁻⁵ t

Thus, t = 14 hours

(c). The activation energy can be calculated using the Arrhenius equation:

k = Ae−Ea/RT

Where:

k is the rate constant

A is the pre-exponential factor

Ea is the activation energy

R is the gas constant (8.314 J/K·mol)

T is the temperature in Kelvin.

Rearranging the equation:

lnk = lnA−Ea/RT

Thus, the plot of ln k versus 1/T will be a straight line with slope −Ea/R.

Using the values for k₁ and k₂ from part (b), we can calculate the activation energy.

Ea = (−R)(slope of the plot)

   = 8.314×(3.9×10⁻⁵−3.1×10⁻⁵)/(1/311−1/309.7)

   = 134.5 kJ/mol (approx)

Thus,

E2−E1 = 134.5−92.3

         = 42.2 kJ/mol.

Therefore, the concentration of the compound after 2.5 h is 0.45mg/100mL, the person with the fever must wait 7.4 h to take the next pill and 14 h to take the third pill and the activation energy is 134.5 kJ/mol.

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Complete question is,

106 Many drugs decompose in blood by a first-order process.

(a) Two tablets of aspirin supply 0.60g of the active compound, After 30 min, this compound reaches a maximum concentration of 2mg/100 mL of blood. If the halftime for its breakdown is 90 min, what is its concentration (in mg/100 mL ) 2.5 h after it reaches its maximum concentration?

(b) For the decomposition of an antibiotic in a person with a normal temperature (98.6 ∘ F),k=3.1×10 −5s −1 ; for a person with a fever (temperature of 101.9 ∘F),k=3.9×10 −5 s −1 . If the person with the fever must take another pill when 32 of the first pill has decomposed. how many hours should she wait to take a second pill? A third pill? (Assume that the pill is effective immediately.)

(c) Calculate E 2for decomposition of the antibiotic in part (b).

The key differentiating factor between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons.

i. Unequal sharing of electrons: In a nonpolar covalent bond, electrons are shared equally between the atoms. This occurs when the atoms have similar electronegativity, meaning they have similar abilities to attract electrons. As a result, there is no significant difference in the electron distribution, and the atoms do not acquire partial charges.

ii. Ions: Ions are charged particles that have gained or lost electrons. Unlike ionic bonds, which involve the complete transfer of electrons, covalent bonds involve the sharing of electrons between atoms. Therefore, the presence of ions does not differentiate between nonpolar and polar covalent bonds.

iii. Atoms of partial charge: In a polar covalent bond, there is an unequal sharing of electrons due to differences in electronegativity between the atoms. One atom has a stronger pull on the shared electrons, resulting in a partial negative charge (δ-) on that atom, while the other atom has a partial positive charge (δ+).

This imbalance in electron distribution creates atoms of partial charge.

Therefore, the key distinguishing characteristic between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons, leading to the development of partial charges on the atoms in a polar covalent bond.

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Answer:

Mass = 917.4 g

Explanation:

Given data:

Number of molecules = 3.00 ×10²⁴ molecules

Mass in gram = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

3.00 ×10²⁴ molecules × 1 mol /  6.022 × 10²³ molecules

0.5×10¹ mol

5 mol

Mass in gram:

Mass = number of moles  × molar mass

Mass = 5 mol  × 183.48 g/mol

Mass = 917.4 g

Answer:

125 cubic meters

Explanation:

Subtract 375-250=125 cubic meters

Answer:

which energy?........

Explanation:

..........................

........

....

The specific gravity of urine is a measure of the concentration of dissolved particles in the urine. These particles include salts, minerals, and waste products, among others. The specific gravity of urine varies depending on factors such as fluid intake, diet, and health status.

When fluid intake is normal, the specific gravity of urine should be between 1.010 and 1.025. This range reflects a healthy balance of hydration and waste elimination. If the specific gravity is lower than 1.010, it may indicate that the person is overhydrated or has a condition that affects the kidneys' ability to concentrate urine. On the other hand, if the specific gravity is higher than 1.025, it may indicate dehydration, a high-protein diet, or a condition that affects the kidneys' ability to dilute urine.

It is important to note that specific gravity measurements are not definitive and should be interpreted in conjunction with other clinical data. For example, if a person has a high specific gravity but no symptoms of dehydration, further tests may be needed to determine the cause. Similarly, a person with a low specific gravity may need additional tests to rule out kidney disease or other conditions.

In conclusion, when fluid intake is normal, the specific gravity of urine should be between 1.010 and 1.025. However, specific gravity measurements should be interpreted in the context of other clinical data to accurately assess a person's health status.

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Answer:

153 g CO₂

Explanation:

To begin, the reaction is not in its simplest form. The coefficients can be divided by two. However, this will not change the answer.

CH₄ + 2 O₂ --> CO₂ + 2 H₂O

You can find the grams of CO₂ by taking the moles of O₂, using the mole to mole ratio of O₂ to CO₂ (via the coefficients), then converting moles of CO₂ to grams. You will need the molar mass of CO₂ since you want to convert it from moles to grams. This is calculated using the values on the periodic table. The ratios should be written in a manner that allows for the cancellation of units. The answer should have 3 sig figs.

12.011 g/mol + 2(15.998 g/mol) = 44.007 g/mol CO₂

6.95 moles O₂          1 mol CO₂           44.007 g CO₂
----------------------  x  -------------------  x  -------------------------  = 153 g CO₂

                                  2 mol O₂             1 mol CO₂

Answer:

d) 0.0962 L

Explanation:

The problem describes a dilution process, meaning that we can solve it by using the following equation:

Where subscript 1 stands for the volume and concentration of the concentrated solution, and 2 for those of the diluted solution. That means that in this case:

We input the data:

And solve for V₁:

Finally we convert 96.2 mL to L:

The answer is thus option d).

Answer:

La configuración electrónica del cloruro es 1s2 2s2 2p6 3s2 3p6.

Explanation:

The standard isotope used to define the atomic mass unit (amu) is carbon-12 (^12C). It is assigned a mass of exactly 12 amu, and the atomic masses of other elements are determined relative to carbon-12.

The atomic mass unit (amu) is a unit of measurement used to express the masses of atoms and molecules on a scale relative to the mass of carbon-12 (^12C). Carbon-12 is chosen as the standard isotope because it is abundant, stable, and has six protons and six neutrons, giving it a total mass of 12 atomic mass units. By definition, carbon-12 is assigned a mass of exactly 12 amu.

To determine the atomic masses of other elements, a mass spectrometer is employed. In a mass spectrometer, ions are accelerated and separated based on their mass-to-charge ratio. The ratio is measured relative to carbon-12, allowing for the determination of the atomic mass of other elements. For example, if an element has an atomic mass of 16 amu, it means its mass is 1.33 times greater than carbon-12.

By using carbon-12 as the standard isotope and establishing a scale based on the mass-to-charge ratio in a mass spectrometer, scientists are able to accurately measure and compare the masses of different elements and molecules in a consistent manner.

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In most drug discovery efforts, compound synthesis is regarded as the rate-limiting phase to accommodate various functional groups.

One of the most typical kinds of chemical reactions is a synthesis reaction, also known as a direct combination reaction. A + B AB is the result of the reaction between two and more chemical species in a synthesis.

The synthesis process is simple to identify in this form since there are more reactants then products. One bigger compound is created when multiple reactants come together. Synthesis reactions can be thought of as the opposite of breakdown processes. In most drug discovery efforts, compound synthesis is regarded as the rate-limiting phase to accommodate various functional groups.

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Answer: The CaCl2 solution will conduct electricity.

Answer:

i think that the  CaCl2 solution will conduct electricity

Explanation:

im not sure but if im wrong im sorry