lactic acid, which consists of c, h, and o, has long been thought to be responsible for muscle soreness following strenuous exercise. determine the empirical formula of lactic acid given that combustion of a 10.0-g sample produces 14.7 g co2 and 6.00 g h2o. what is the molecular formula if the molecular weight of lactic acid is 90.08 g/mol

Answer:

I am not 100% sure but I think it is 26.981538

Explanation:

All of the above are the evidence for a chemical reaction. The correct option is C.

A chemical reaction is a process in which two or more substances combine to form one or more new substances. In chemical reactions, bonds between atoms are formed or broken. They are usually accompanied by an energy transfer. As the reactants turn into products, the energy is either released or consumed.

There are various types of chemical reactions, and each has its own set of evidence. Here is the following evidence for a chemical reaction: a gas is detected. Gas is emitted when a chemical reaction occurs. When we think about combustion reactions, such as burning a candle or gasoline, gas is typically the first thing that comes to mind.

When vinegar is added to baking soda, carbon dioxide gas is produced. a precipitate is formed. Precipitates are formed in certain chemical reactions when two aqueous solutions are combined. The reaction produces a solid that is insoluble in water.

For example, if hydrochloric acid is added to sodium hydroxide, sodium chloride precipitates, leaving only water behind, and a flame is observed. Some reactions emit heat, and a flame can be observed in some cases. Combustion reactions and other oxidations are the most frequent reactions that produce flames.

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The Ksp value for AB is approximately 0.017956 M².

To determine the Ksp (solubility product constant) of the compound AB, we can use the given information about its solubility in a 1.000 M solution of C.

The general equation for the dissolution of a compound AB can be written as follows:

AB(s) ⇌ A+(aq) + B⁻(aq)

The solubility product constant (Ksp) expression for this equilibrium is:

Ksp = [A⁺][B⁻]

In this case, we are given that the solubility of AB in the presence of C is 0.134 M. Let's assume that the concentration of A+ and B⁻ in the equilibrium is also x M.

Using the given information, we can set up the equation:

Ksp = [A+][B⁻] = x × x = x²

We also know that the concentration of C (the compound in the aqueous solution) is 1.000 M.

Now, we need to consider the stoichiometry of the equation. Since AB dissociates into A+ and B⁻, the molar concentration of A+ and B⁻ will be equal to the solubility of AB. Therefore, the concentration of A+ and B⁻ is 0.134 M.

Plugging in the values, we have:

Ksp = (0.134 M) × (0.134 M) = 0.017956 M²

So, the Ksp value for AB is approximately 0.017956 M².

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The concentration of the nitric acid solution is 1.107 M.

We can calculate the concentration of the acid, we need to divide the volume of the acid (35 ml) by the volume of the potassium hydroxide (15.5 ml). The concentration of the nitric acid is then 2.25 m.

The concentration of acid in a 35 mL solution of nitric acid is calculated as follow

Here it is shown

Volume of nitric acid solution = 35 mL

Volume of potassium hydroxide solution = 15.5 mL

Concentration of potassium hydroxide solution = 2.5 M

Let the concentration of the nitric acid solution be C.

Moles of potassium hydroxide solution = concentration × volume = 2.5 × 15.5/1000 = 0.03875 moles

Since the acid and base are completely neutralized, the number of moles of acid and base must be equal.

So, Moles of nitric acid solution = 0.03875 M

Thus, concentration of nitric acid solution = moles/volume = 0.03875/(35/1000) = 1.107 M

Therefore, the concentration of the nitric acid solution is 1.107 M.

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Answer:

a) H2SO4 + 2KOH -> 2H2O + K2SO4

b) 9.809 ml

Explanation:

Number of Moles = Mass/ Molar Mass

Therefore: Mass = Number of moles * Molar Mass

--------------------------------------------

Molar mass of H2SO4:

H2= 2.02

S= 32.07

O4= 64

--------------------------------------------

H2SO4 has the molar mass of 98.09

--------------------------------------------

the Moles of H2SO4 is given to be 0.100M

Therefore:

Mass= 98.09*0.1

          = 9.809g

---------------------------------------------------

Assuming that 1 g= 1 ml, the volume of sulfuric acid is 9.809 ml.

Explanation:

Because two sides don't have an equal number of O atoms. The left side has 6 O atoms (3*2) while the right side has only 1 O atom. to balance the equation, you need an equal number of atoms on both sides.

The probability that at least one of the specialists will detect tuberculosis in this person is 0.9994.

Given that a person with tuberculosis is given a chest x-ray. Four tuberculosis x-ray specialists examine each x-ray independently. If each specialist can detect tuberculosis 79% of the time when it is present.The probability that at least 1 of the specialists will detect tuberculosis in this person is to be calculated.

P( at least 1 specialist detects tuberculosis )=?

The probability that each specialist can detect tuberculosis = P(Detecting tuberculosis) = 79/100 = 0.79

The probability that the specialist cannot detect tuberculosis = P(Not detecting tuberculosis) = 1 - P(Detecting tuberculosis) = 1 - 0.79 = 0.21

Let A be the event that the specialist can detect tuberculosis.

Let B be the event that the specialist cannot detect tuberculosis.

Then, P(A) = 0.79, and P(B) = 0.21

Now, we need to find the probability that at least one of the specialist detects tuberculosis.The probability that at least one of the specialist detects tuberculosis is given as :

P(at least one of the specialist detects tuberculosis) = 1 - P(no specialist detects tuberculosis)

P(no specialist detects tuberculosis) = P(Not detecting tuberculosis) for the 1st specialist × P(Not detecting tuberculosis) for the 2nd specialist × P(Not detecting tuberculosis) for the 3rd specialist × P(Not detecting tuberculosis) for the 4th specialist = 0.21 × 0.21 × 0.21 × 0.21 = (0.21)^4

Putting this value in the formula :

P(at least one of the specialist detects tuberculosis) = 1 - P(no specialist detects tuberculosis)

= 1 - (0.21)^4 = 0.9994= 0.9994 (rounded to four decimal places)

Therefore, the probability is 0.9994.

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Option - D:The statement that is NOT TRUE about simple distillation is d. A sand bath can be used in place of a water bath to provide even heating of the flask.

Simple distillation involves heating a mixture to evaporate the more volatile component, condensing the vapour, and collecting the purified liquid. As it can sustain a consistent temperature near to the mixture's boiling point, a water bath is frequently utilised to enable uniform heating of the flask. As a sand bath might have hot patches or temperature changes that can impact the separation's quality, it could not deliver as uniform heating. a technique for separating mixes in a boiling liquid combination based on variations in their volatilities. After applying heat to a sample combination, the components are instantly cooled by the action of cold water in a condenser. There are two steps in the distillation refining process.

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Answer:

13. A. Kinetic energy increases

14. A. Kinetic energy

15. B. is not transferable

Sorry if I got any wrong, they should be all correct. I tryed.

The human activity creating water pollution and depletion are uses of fertilizers, detergents and chloro flouro carbon many other things.

Water pollution is defined as the contamination of water bodies, usually as a result of human activity, in such a way that their lawful uses are harmed.

The activities of human that creating water pollution are:

And depletion in the ozone layer are due to halogen source gases, which contain chlorine and bromine atoms, are produced by human activities. These emissions into the atmosphere eventually contribute to ozone depletion in the stratosphere.

Hence human activities are uses of fertilizers, detergents and many other things.

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Answer: Gasoline

Explanation: Siri said so

The non-aqueous means it does not contain water. Among the given options gasoline is an example of a non-aqueous solution. The correct option is A.

The solution which is obtained by dissolving solute in any liquid other than water is defined as the non-aqueous solution. If solute is dissolved in solvent like benzene, alcohol, ether, carbon disulphide, acetone etc. forms a non aqueous solution.

The major difference between the aqueous and non-aqueous solution is that the solvent of an aqueous solution is water whereas in non-aqueous solutions, the solvent is any substance other than water.

The solvent of non-aqueous solution can be polar or nonpolar and depending on the polarity the solutes dissolve in the solvent. Here gasoline is an example of the non-aqueous solution. The gasoline is a crude oil which does not include water as an ingredient.

Thus the correct option is A.

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The number of valence electron pairs in the outermost shell, as determined by the valence shell electron repulsion theory (VSEPR), determines the molecular shape.

By analyzing the repulsion between bond electron pairs in the outermost electron shell, a process known as the molecular shape can determine the shape of a molecule. Because most physical and chemical properties are influenced by molecular shape, it is crucial to study molecular shape or geometry.

The foundation of VSEPR is minimizing the strength of the electron-pair repulsion surrounding the central atom under consideration. The foundation of the VSEPR theory is the notion that the geometry (shape) of a molecule is primarily determined by the repulsion between the pairs of electrons surrounding a central atom.

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Answer:

B) we will convert the 10 g of NaCl into moles.

Explanation:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

we will convert the 10 g of NaCl into moles.

Number of moles of NaCl:

Number of moles = mass/molar mass

Number of moles = 10 g/ 58.44 gmol

Number of moles = 0.17 mol

1 Kg = 1 L

Molarity = 0.17 mol / 2 L

Molarity = 0.085 mol/L

Molarity = 0.085 M

Answer:

B. Convert the 10g of NaCl to moles of NaCl

Answer:

A). half, higher

Explanation:

The Formal charge is elaborated as the 'allocated charge to a molecules' atom' on the basis of the assumption that the electrons present in the chemical bond are equally split among the atoms. It is estimated by 'halving the no. of bonding electrons that encircle the atom.

While Oxidation number is characterized as the 'hypothetical charge of an atom that is present within a molecule.' It is also defined as 'the actual number of lost or gained electrons or the rate at which the electrons are gained or lost by an atom to develop a chemical bond along with the other atom.' It is calculated by allocating or sharing the electrons having the higher electronegativity belonging to a specific bond with the other. Thus, option A is the correct answer.

Explanation:

The steps given in the question are incorrect.

Step 1 should be convert atoms to moles (n). Step 2 should be convert moles (n) to mass (m).

Step 1

Use dimensional analysis to convert the number of atoms to moles.

1 mole atoms = 6.022 × 10²³ atoms

n(Ag) = 2.3 × 10²⁴ Ag atoms × (1 mol Ag/6.022 × 10²³ Ag atoms) = 3.8193 mol Ag

Step 2

Convert the moles of Ag to mass.

mass (m) = moles (n) × molar mass (M)

n(Ag) = 3.8193 mol Ag

M(Ag) = atomic weight on the periodic table in g/mol = 107.868 g Ag/mol Ag

m(Ag) = 3.8193 mol × 107.868 g/mol = 412 g Ag = 410 g Ag rounded to two significant figures

The mass of 2.3 × 10²⁴ Ag atoms is approximately 410 g.

Answer:

\(\boxed {\boxed {\sf 3.8 \ moles \ of \ sulfur}}\)

Explanation:

We are asked to convert a number of atoms to moles.

We can convert atoms to moles using Avogadro's Number, which is 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this problem, the particles are atoms of sulfur. There are 6.022 ×10²³ atoms of sulfur in 1 mole of sulfur.

We use dimensional analysis to convert atoms to moles. This involves setting up ratios. Use Avogadro's Number and the underlined information to make a ratio.

\(\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}\)

We are converting 2.3 ×10²⁴ atoms of sulfur to moles, so we multiply by this value.

\(2.3 \times 10^{24} \ atoms \ S *\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}\)

Flip the ratio. It is equivalent, but it allows the units of atoms of sulfur to cancel.

\(2.3 \times 10^{24} \ atoms \ S *\frac {1 \ mol \ S}{6.022 \times 10^{23} \ atoms \ S}\)

\(2.3 \times 10^{24} *\frac {1 \ mol \ S}{6.022 \times 10^{23} }\)

\(\frac {2.3 \times 10^{24} }{6.022 \times 10^{23} } \ mol \ S\)

\(3.819329127 \ mol \ S\)

The original measurement of atoms (2.3 ×10²⁴) has 2 significant figures, so our answer must have the same. For the number we calculated that is the tenths place. The 1 in the hundredths place to the right (3.819329127) tells us to leave the 8 in the tenths place (3.819329127).

\(3.8 \ mol \ S\)

2.3 ×10²⁴ atoms of sulfur is equal to approximately 3.8 moles of sulfur.

Answer:

here

Explanation:

a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.

The earthquakes distributed on the map on the fault lines at edge of tectonic plates.

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Answer: Explanation:

Water wheels have several important parts that work together (see diagram).

*Flowing water (delivered via a channel called a mill race)

*Large wooden or metal wheels.

*Paddles or buckets (arranged evenly around the wheel)

*Axle.

*Belts or gears.

Answer:

4 meters

Explanation:

100 centimeters to meters, so move the decimal 2 spaces left.

400 becomes 4.00

Answer : The initial concentration of HI and concentration of HI at equilibrium is, 0.27 M and 0.386 M  respectively.

Solution :  Given,

Initial concentration of H_2 and I_2 = 0.11 M

Concentration of H_2 and I_2 at equilibrium = 0.052 M

Let the initial concentration of HI be, C

The given equilibrium reaction is,

    H_2(g)+I_2(g)\rightleftharpoons 2HI(g)

Initially               0.11   0.11            C

At equilibrium  (0.11-x) (0.11-x)   (C+2x)

As we are given that:

Concentration of H_2 and I_2 at equilibrium = 0.052 M  = (0.11-x)

The expression of K_c will be,

K_c=\frac{[HI]^2}{[H_2][I_2]}

54.3=\frac{(C+2(0.058))^2}{(0.052)\times (0.052)}

By solving the terms, we get:

C = 0.27 M

Thus, initial concentration of HI = C = 0.27 M

Thus, the concentration of HI at equilibrium = (C+2x) = 0.27 + 2(0.058) = 0.386 M

The original size of the carbon-14 sample was 560 grams if the sample of carbon-14 has been decaying for 22,920 years and it is now 35. 0 grams.

The given data is as follows:

Material given = carbon -14

Time period = 22,,920 years

weight = 35 grams

To calculate the original sample size, we need to use the formula,

N = M (1/2)^(t/T)

35.0 g = M (1/2)^(22,920/5730)

35.0 g = M (1/2)^4

35.0 g = M (1/16)

For simplification, we need to multiply both sides by 16 to balance the value on the right side.

M = 16 * 35.0g

M = 560g

Therefore, we can conclude that the original size of the carbon-14 sample was 560 grams.

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If I accidentally left my working stock in room temperature, there are a few steps that I would take in order to assess the damage and salvage the situation. First, I would check the expiration date of the stock to see if it was still viable before being exposed to room temperature. If it had expired, then there may not be much I could do to save it.

Assuming the stock was still viable, I would then inspect it for any signs of contamination or degradation.

If the stock had become contaminated or had started to degrade, then it would need to be discarded.
If the stock appeared to be still usable, I would then perform a series of tests to determine if it was still functional.

I would conduct a viability assay, such as a colony forming unit (CFU) assay or a growth curve analysis, to determine if the stock was still capable of growing and dividing.

If the stock was still functional, then I would use it for experiments as planned, but with the understanding that it may not perform as well as a freshly prepared batch.
To prevent this situation from happening in the future, I would take steps to label and store my stocks properly and to set reminders for myself to check on their status regularly.

It's always better to be safe than sorry when it comes to important reagents and stocks in the lab.

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Answer:

Those photos are a chemical change

Explanation:

area of triangle is 1÷2 base xheight

\(1 \div 2 \times45 \times 11 \\ = 247.5\)

You may determine the number of moles of solution you need by multiplying the volume in liters (4.00L) by the solution's molar concentration (0.250M), and then by the mass of sodium hydroxide (39.99 g/mol) in molar form. 1L = 39.99g × 4.00L x 0.250 M x 39.99g

The number sodium hydroxide of moles of solute dissolved in one liter of a solution is known as its molarity.

where,

250 mM Molarity =

moles of solute = n

= liquid volume in milliliters = 4L = 4000 ml

Now, using the molarity formula to combine all the values provided, we obtain

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Answer:

Kinetic energy would have to work ten times harder than potential energy.

Explanation:

Let’s say you have a boulder and your asked to push it up the hill it would be difficult right? But lets reverse the situation what if you are asked to roll the boulder down the hill it wouldn’t be much work because the hill is basically doing all the work For you. Hope this Helps:)

Explanation:

Is the loss of electrons, gains of oxygen or loss of hydrogen

Answer:

Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule

Answer:

B

Explanation:

the reaction is endothermic because of the temperature drop and the enthralpy is negative because its an endothermic reaction.

I did some research so I believe this to be correct but if its no I'm sorry