The half-life of cobalt-60 is 5.3 yr. how much of a 1mg sample of cobalt -60 is left after 15.9 yr period?

Explanation:

A. Chemical potential energy.

Answer:

B for sure

Explanation:

Because they all consume

Answer:

C. The potential energy change for a chemical reaction.

Explanation:

The reaction coordinate q illustrates, graphically, the energy changes during exothermic and endothermic reactions. This graphical representation of the energy changes in the course of a chemical reaction is known as reaction coordinates. A reaction coordinate is a graphical sequence of steps by which the reaction progresses from reactants through activated complexes to products. Reaction coordinates explain how far a reaction has proceeded towards the products or from the reactants.

From the images attached below, we can see the reaction coordinates in the reaction profiles.

The pH of the solution prepared by diluting 250.0 mL of 0.045 M Sr(OH)2 to a total volume of 625.0 mL is approximately 12.56.

To calculate the pH of a solution prepared by diluting 250.0 mL of 0.045 M Sr(OH)2 with enough water to make a total volume of 625.0 mL, we need to consider the dissociation of Sr(OH)2 and the resulting concentration of hydroxide ions (OH-). The pH can be determined by taking the negative logarithm (base 10) of the hydroxide ion concentration.

The initial concentration of Sr(OH)2 is 0.045 M, and after dilution, the final volume becomes 625.0 mL. To find the final concentration of hydroxide ions, we can use the fact that Sr(OH)2 dissociates completely in water to produce two hydroxide ions for every mole of Sr(OH)2.

Given that the final volume is 625.0 mL, we can calculate the moles of Sr(OH)2 initially present:

Moles of Sr(OH)2 = initial concentration * initial volume

Moles of Sr(OH)2 = 0.045 M * 0.250 L (converting mL to L) = 0.01125 moles

Since each mole of Sr(OH)2 produces two moles of hydroxide ions, the moles of hydroxide ions in the solution will be twice the moles of Sr(OH)2:

Moles of OH- = 2 * 0.01125 moles = 0.0225 moles

To find the final concentration of hydroxide ions:

Final concentration of OH- = moles of OH- / final volume

Final concentration of OH- = 0.0225 moles / 0.625 L (converting mL to L) = 0.036 M

Finally, we can calculate the pH using the negative logarithm (base 10) of the hydroxide ion concentration:

pOH = -log10(OH- concentration) = -log10(0.036) ≈ 1.44

pH = 14 - pOH = 14 - 1.44 ≈ 12.56

Therefore, the pH of the solution prepared by diluting 250.0 mL of 0.045 M Sr(OH)2 to a total volume of 625.0 mL is approximately 12.56.


To learn more about pH click here: brainly.com/question/2288405

#SPJ11

The resulting pH of the solution formed by adding 200 ml of 0.30 M formic acid to 400 ml of water, with a pKa of 3.75, is approximately 2.3.

To determine the resulting pH of the solution, we need to consider the dissociation of formic acid (HCOOH) in water. Formic acid is a weak acid that partially dissociates into hydrogen ions (H⁺) and formate ions (HCOO⁻). The dissociation constant of formic acid is represented by pKa, which is equal to -log(Ka), where Ka is the acid dissociation constant.

Given the pKa of formic acid as 3.75, we can use the Henderson-Hasselbalch equation to calculate the pH:

pH = pKa + log([A⁻]/[HA])

In this case, [A⁻] represents the concentration of the formate ions and [HA] represents the concentration of the undissociated formic acid. The total volume of the resulting solution is 200 ml + 400 ml = 600 ml.

Using the given concentration of 0.30 M formic acid, we can calculate the concentration of formate ions ([A⁻]) and undissociated formic acid ([HA]):

[HA] = concentration of formic acid = 0.30 M x (200 ml/600 ml) = 0.10 M

[A⁻] = concentration of formate ions = 0.30 M x (400 ml/600 ml) = 0.20 M

Substituting these values into the Henderson-Hasselbalch equation:

pH = 3.75 + log(0.20/0.10) = 2.3 (rounded to one decimal place)

Therefore, the resulting pH of the solution is approximately 2.3 when 200 ml of 0.30 M formic acid is added to 400 ml of water with a pKa of 3.75.

To know more about formic acid refer here:

https://brainly.com/question/30620222#

#SPJ11

Complete Question:

if 200ml of 0.30M formic acid is added to 400 ml of water, what is the resulting PH of the solution? round the answer to one decimal place Pka 3.75

Would required more titrant for butanedioic acid than for benzoic acid if bottle of butanedioic acid which you mistakenly used for the titration instead of benzoic acid.

Butanedioic acid, often known as succinic acid, is diprotic acid. One mole of such an acid needs two moles of base to be entirely neutralised. In the titration of succinic acid against NaOH, phenolphthalein indicator is used as a reaction completion indicator.Aqueous solutions do not entirely ionise succinnic acid because butanedioic acid and hydrologic acid are weak acid and strong acid. It is hesitant to release its protons (H+) as a result.At pH 4.5, the base removes the first proton, and at pH 5.5, the base removes the second proton. As a result, the acid-base reaction does not entirely remove the first proton until the second proton is well along in its removal.

To learn more about titration click here,

https://brainly.com/question/2728613

#SPJ4

Answer:

C. Theories have been confirmed through tests; hypotheses haven't.

Hope this helps!!

Answer:

C: The Cheetah running at a constant speed.

Explanation:

Acceleration can be defined as:

1: A decrease in speed

2: An increase in speed

3: A change in direction.

The cheetah is the only object that does not meet any criteria for acceleration.

The example that is not an example of acceleration is a cheetah running at a constant speed on a hunt. The correct option is option (c).

Acceleration refers to a change in velocity, either in magnitude or direction. In the case of the cheetah running at a constant speed, there is no change in velocity, so there is no acceleration.

The cheetah maintains a steady speed,  there is no change in velocity hence, it is not accelerating.

Therefore, a cheetah runs at a constant speed on a hunt. The correct option is option (c).

To know more about acceleration:

https://brainly.com/question/30499732

#SPJ6

S is a solid at room temperature.

A substance whose particles are arranged in a crystal lattice at room temperature will be a solid.

A solid have a definite shape and volume at room temperature due to the regular arrangement of the particles of the solid.

Solids melt at their melting points. A solid whose melting point is less than room temperature will be a liquid or gas at room temperature.

Room temperature is 25°C

Considering the given table:

Solid S has a melting point above room temperature, therefore S is a solid at room temperature.

In conclusion, solids have definite shapes and volume.

Learn more about solids at: https://brainly.com/question/24943129

#SPJ1

Based on stoichiometry and the ideal gas law, approximately 0.143 L of H₂S gas is needed to make 14.0 g of S.

To determine the volume of H₂S gas needed to produce 14.0 g of S, we need to use stoichiometry and the ideal gas law.

The balanced equation for the reaction between H₂S and SO₂ to produce S is:

H₂S + 2 SO₂ -> 3 S + 2 H₂O

From the balanced equation, we can see that 1 mole of H₂S produces 3 moles of S.

First, we need to calculate the number of moles of S produced from 14.0 g of S:

Molar mass of S = 32.06 g/mol

Number of moles of S = 14.0 g / 32.06 g/mol = 0.436 mol

Since 1 mole of H₂S produces 3 moles of S, we can calculate the number of moles of H₂S needed:

Number of moles of H₂S = 0.436 mol / 3 mol = 0.145 mol

Next, we can use the ideal gas law to find the volume of H₂S gas:

PV = nRT

Where:

P = pressure = 725 torr

V = volume (unknown)

n = number of moles of H₂S = 0.145 mol

R = ideal gas constant = 0.0821 L·atm/(mol·K)

T = temperature = 225 K

Rearranging the equation to solve for V:

V = (nRT) / P

Substituting the values:

V = (0.145 mol * 0.0821 L·atm/(mol·K) * 225 K) / 725 torr

Converting torr to atm (1 atm = 760 torr):

V = (0.145 mol * 0.0821 L·atm/(mol·K) * 225 K) / (725 torr / 760 torr/atm)

Calculating the volume:

V = 0.143 L

Therefore, the volume of H₂S gas needed to produce 14.0 g of S is approximately 0.143 L.

To know more about ideal gas law refer here :    

https://brainly.com/question/33342075#

#SPJ11

As the term "peroxide" is used in Chapter 10 it can refer to RCOOCR structure.

Hydrogen peroxide solutions up to 9% in concentration are often safe when consumed; nonetheless, even a 3% solution is slightly irritating to nasal mucosa and might result in vomiting and diarrhea. Industrial-strength solutions (10%) when consumed induce systemic toxicity and have been linked to deaths.

The fact that oxygen is an anion and hydrochloric acid is a chemical substance is the main distinction between the two peroxides. The specific class of oxygen compounds known as peroxides has distinctive characteristics. Thenard, a French chemist, made the discovery of hydrogen peroxide in 1818.

To know more about peroxide visit:

https://brainly.com/question/29102186

#SPJ4

Transition metals are much stronger and denser than alkali metals and alkaline earth metals and it is located between group 2 and group 3 of the periodic table.

Alkali metals and alkaline earth metals form ions with a +1 charge while the transition metals can form ions with variable charges. The transition metals are much harder, stronger and denser. They have much higher melting points . The transition metals are much less reactive. The alkali metals react with water, oxygen and halogens while the transition metals either react very slowly or do not react at all. A group 1 of the periodic table that is alkali metal will tarnish in the presence of oxygen as a metal oxide is formed. When cut with a knife the shiny appearance of the metal disappears in seconds as it is covered by the dull metal oxide.

To learn more about Transition Metals please visit:

https://brainly.com/question/12843347

#SPJ4

Answer:

A

Explanation:

Answer:

1

Explanation:

A.) A single bond shares 1 pair of electrons between 2 atoms.

B.) A double bond shares 2 pairs of electrons between 2 atoms.

C.) A triple bond shares 3 pairs of electrons between 2 atoms.

Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

Answer:

df

Explanation:

fawfe

Answer:

yes it is

hope it helps you

The most appropriate reagent for this conversion would be chromic acid \((CrO_3/H_2SO_4).\)

To convert the secondary alcohol intermediate to acetophenone, we need to choose appropriate reagents that can facilitate the desired transformation.

One commonly used reagent for this conversion is chromic acid, which is a mixture of chromium trioxide (\(CrO_3\)) and sulfuric acid (\(H_2SO_4\)). The reaction is typically carried out under reflux conditions.

The oxidation of the secondary alcohol to the ketone can be represented by the following equation:

\(\[ \text{Secondary Alcohol} \xrightarrow[\text{Reagents}]{\text{Oxidation}} \text{Acetophenone} \]\)

Therefore, the most appropriate reagent for this conversion would be chromic acid \((CrO_3/H_2SO_4).\)

Please note that other reagents such as Jones reagent \((CrO_3/pyridine)\) or PCC (pyridinium chlorochromate) can also be used for this oxidation reaction.

Therefore, based on the given information, chromic acid is the most commonly used reagent for the conversion of a secondary alcohol intermediate to acetophenone.

To learn more about chromic acid from the given link

https://brainly.com/question/13059491

#SPJ4

When [S] is much greater than KM, the rate of reaction is then independent of the substrate concentration, and is said to be first order in enzyme.

The maximum reaction rate occurs when all enzyme active sites are saturated with substrate. The Michaelis-Menten equation and its plot reveal that reaction rates rely on substrate concentration. When the substrate concentration is relatively small, the reaction rate is proportional to the substrate concentration. The velocity becomes independent of the substrate concentration and approaches a constant maximum value as the substrate concentration becomes more significant.

When [S] is much greater than KM, the rate of reaction is then independent of the substrate concentration, and is said to be first order in enzyme.

A [S] that is much greater than KM can lead to the reaction rate being independent of substrate concentration and thus exhibiting first-order kinetics. The reaction is first order in enzyme and follows the equation

V=Vmax [E]o[S]/Km+[S].

In a nutshell, the reaction rate can be calculated using the Michaelis-Menten equation, which expresses the reaction rate as a function of the concentration of substrate and enzyme.

The substrate concentration and enzyme concentration can be changed to optimize the reaction rate.

To know more about concentration visit:

https://brainly.com/question/22445180

#SPJ11

To calculate the volume of a gas, use the ideal gas law equation, PV = nRT.

Where:

P = pressure of the gas (in units of pressure, such as atm)

V = volume of the gas (in units of volume, such as liters)

n = number of moles of the gas

R = ideal gas constant (0.0821 L·atm/(mol·K) or 8.314 J/(mol·K))

T = temperature of the gas (in units of temperature, such as Kelvin)

It is important to note that the expression to calculate the volume of the gas would depend on the specific conditions (pressure and temperature) under which the balloon is being measured.

To learn more about the ideal gas law equation, follow the link:

https://brainly.com/question/11544185

#SPJ1

Answer:

Definition of Genetic Material

Well, your genetic material known as deoxyribonucleic acid (DNA) is the reason. DNA is the hereditary material found in the nucleus of eukaryotic cells (animal and plant) and the cytoplasm of prokaryotic cells (bacteria) that determines the composition of the organism.

A formula for the sensitivity dR/dM  represents the sensitivity of the body's reaction to the medication. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

To find a formula for the sensitivity, dR/dM, let's differentiate the given function R(M) with respect to M.

Step 1: Start with the function \(R(M) = M^2(C/2 - M/3).\)

Step 2: Apply the power rule of differentiation to differentiate M^2. The power rule states that if

\(f(x) = x^n, then f'(x) = n*x^(n-1). \\\)

n this case, n = 2.

\(dR/dM = 2M^(2-1)*(C/2 - M/3).\)

Simplifying, we have:

\(dR/dM = 2M*(C/2 - M/3).\)

Step 3: Distribute the 2M to each term inside the parentheses:

\(dR/dM = M*C - (2M^2)/3.\)

This formula represents the sensitivity of the body's reaction to the medication, dR/dM. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

Learn more about sensitivity from this link:

https://brainly.com/question/14472410

#SPJ11

the formula for the sensitivity, or the rate of change of the reaction R with respect to the dose M, is

dR/dM = MC - M\(^2^/^3\)

We calculate the derivative of the reaction function R(M) with respect to M.

the reaction function: R(M) = M²(C/2 - M/3)

We will apply  the power rule and the constant multiple rule of differentiation,

dR/dM = d/dM [M²(C/2 - M/3)]

= 2M(C/2 - M/3) + M²(0 - (-1/3))

= 2M(C/2 - M/3) + M\(^2^/^3\)

dR/dM =\(MC - 2M^2^/^3 + M^2^/^3\)

= \(MC - M^2^/^3\)

Learn more about power rule at:

https://brainly.com/question/29288036

#SPJ4

Option C) RbOH, HBr cannot be mixed together to form a buffer solution is Correct. A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.

The ability of a solution to resist changes in pH is determined by the concentrations of the weak acids and bases present in the solution, as well as the concentration of the strong acid or base that is added to the solution. The weak acids and bases present in a buffer solution react with the strong acid or base to form a salt and water. The salt and water react to neutralize the strong acid or base, maintaining the pH of the solution.

In the case of RbOH and HBr, the weak base, RbOH, and the weak acid, HBr, cannot react with each other to form a salt and water. Therefore, they cannot form a buffer solution. The other pairs of solutions can form a buffer solution if the concentrations of the weak acids and bases present in the solutions are appropriate and the strong acid or base is added in the appropriate concentration.

Learn more about buffer solution Visit: brainly.com/question/13076037

#SPJ4

Answer:

\(\large \boxed{\text{0.88 L}}\)

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

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

Data:

\(\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}\)

Calculations:  

\(\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}\)

Answer:

4.is balanced equation

hope it helps.

a. The Lewis structure for SCl₂ is S-Cl-Cl with a lone pair on sulfur. The VSEPR theory predicts a bent or V-shaped molecular geometry.

b. The Lewis structure for PI₃ is P-I-I-I with two lone pairs on the central phosphorus atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

c. The Lewis structure for Cl₂CO is O=C=Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry for Cl2CO.

d. The Lewis structure for NH₂Cl is H-N-Cl with two lone pairs on the nitrogen atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

e. The Lewis structure for SiCl₃Br is Br-Si-Cl-Cl-Cl with no lone pairs. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

f. The Lewis structure for ONCl is O=N-Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry.

To draw the Lewis structure, you need to determine the number of valence electrons for each atom in the molecule and then arrange them to form covalent bonds while fulfilling the octet rule (except for hydrogen, which follows the duet rule). Once the Lewis structure is determined, you can use the VSEPR theory to predict the molecular geometry based on the arrangement of electron pairs around the central atom.

In each case, the molecular geometry is determined by the number of bonding and lone pairs of electrons around the central atom. The VSEPR theory provides a model for predicting the shapes of molecules based on the repulsion between electron pairs.

The molecular geometries predicted by the VSEPR theory are as follows:

a. SCl₂: Bent or V-shaped

b. PI₃: Trigonal pyramidal

c. Cl₂CO: Linear

d. NH₂Cl: Trigonal pyramidal

e. SiCl₃Br: Trigonal pyramidal

f. ONCl: Linear

To learn more about molecular geometry, here

https://brainly.com/question/31984103

#SPJ4

Answer:

B

P

K

Explanation:

K: 203pm

B: 84pm

P: 107pm

There isn't an E on the Periodic Table?!

The correct answer is [a].The percent by mass of sodium chloride in a solution of 14.0 g of sodium chloride in enough water to make 91.0 g of solution is 15.4%.

Solution, in chemistry, homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.

The term solution is commonly applied to liquid state of matter, but solutions of gases and solids are possible. Air, for example, is a solution consisting chiefly of oxygen and nitrogen with the trace amounts of several other gases, and brass is a solution composed of copper and zinc.

Solutions play a significant role in the processes of life. In blood plasma, oxygen from the lungs dissolves and chemically joins with hemoglobin in red blood cells before being delivered to the body's tissues. The byproducts of digestion are also transported to other bodily areas in solution. Many real-world situations can be solved by using liquids' capacity to dissolve other liquids or solids.

Chemists take advantage of differences in the solubility to separate and purify materials and to carry out chemical analysis. Most chemical reactions occur in solution and are influenced by solubilities of the reagents. Materials for chemical manufacturing equipment are selected to resist solvent action of their contents.

Percent by mass= \(\frac{weight of solute}{weight of solution}\)*100= \(\frac{14}{91}*100= 15.4%\)\(%\)%

To know more about sodium chloride visit: brainly.com/question/9811771

#SPJ4

Answer:

10.35= 4 sig figs but change it to 2 since it's 2.3 is the lowest number

10.

hope this helps

have a good day :)

Explanation: