A baby’s car seat sits on top of a bench 2 m tall. The baby and the car seat have a weight of 12 N. Find the energy of the baby and its car seat.

The solution with the lowest solubility of Zn(OH)2 is 1 M Zn(NO3)2 due to the presence of a high concentration of Zn2+ ions causing a common ion effect.

The solubility of Zn(OH)2 would be lowest in a solution with a high concentration of a common ion that can react with the Zn(OH)2 and shift the equilibrium towards the formation of the insoluble compound. Among the given options, the solution with the lowest solubility of Zn(OH)2 would be 1 M Zn(NO3)2.

When Zn(NO3)2 is dissolved in water, it dissociates to form Zn2+ and NO3- ions. The presence of a high concentration of Zn2+ ions in the solution creates a common ion effect, which reduces the solubility of Zn(OH)2. According to Le Chatelier's principle, the equilibrium is shifted in the direction that reduces the concentration of the common ion, in this case, Zn2+ ions. As a result, the solubility of Zn(OH)2 is decreased.

In contrast, solutions such as 1 M HCl, 1 M NaOH, pure water, and 1 M NH3 do not contain a high concentration of Zn2+ ions or any other common ions that can significantly affect the solubility of Zn(OH)2. Therefore, the solubility of Zn(OH)2 would be lowest in 1 M Zn(NO3)2 solution due to the common ion effect.

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As the PMHNP, you decide to order a lithium level that comes back at 2.3mmol/l. The best line of action to take Examine other hypotheses for the cause of his symptoms and give him loperamide for diarrhoea and ropinirole for the tremors.

What do you mean by lithium level?

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The Born -Haber cycle is  used to find out the lattice energy and formation enthalpy of a reaction from its individual steps. The total energy of the cycle is zero.

According to Hess law, we can split a reaction into several steps. each steps involves the phase transitions, ionization of constituent elements.

The energy required form a solid compound from its constituent elements in gaseous state is called the lattice energy of the compound. Here the formation of KBr from gaseous K and Br is given. Thus the enthalpy change is called lattice energy.

The lattice energy plus the formation energy is called the total energy in the reaction. Where, the enthalpy change of the cycle is zero. The Born -Haber cycle of the given reaction include first reaction with the phase transition of each elements and their ionization.

The ionized atoms combine together to form the product, which is written as the overall reaction in the top.

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When the silver carbonate dissolves in the water, the ions are produced are Ag⁺  and CO₃²⁻.

The chemical compound ,silver carbonate with the chemical formula that is Ag₂CO₃ is very poorly soluble in the water. The color of the compound silver carbonate is yellow color. It is the transition metal carbonate that is the reason it will not dissolve properly in the water. The very small amount of the silver carbonate is soluble in the water. The silver carbonate is sparingly dissolves in the water.

Thus, Ag⁺  and CO₃²⁻ ion are are produce if we dissolve the solid silver carbonate in to the water.

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Answer:

Silver (Ag)

Explanation:

The electronic configuration of copper is shown below;

[Kr]4d10 5s1

We can see that there is only one 5s1 electron. Hence Ag^+ tends to display a pseudo noble gas configuration. This pseudo noble gas configuration explains why silver is prevalent in the +1 oxidation state.

The other transition metals have many stable oxidation states found in nature. Chromium is observed both in +3 and +6 oxidation states. Iron is found in +2 and +3 oxidation states and copper is mostly stable in the +2 oxidation state since the +1 oxidation state readily disproportionate.

Hence silver tends to have only a single ionic charge for reasons aptly stated above.

Answer:

kilo seconds

Explanation:

kilo prefix means it is large and . milli as small

Answer:

Proteins have different functions within living beings: Cellular transport. Structure of hair, muscle, nails, cell components and cell membranes. Biological catalysts or enzymes.

Explanation:

I hope this answer has helped you

Answer:

CN- is the molecule which contains a covalent bond in this scenario.

This is the type of bond formed as a result of sharing of electrons between atoms of elements.

It exists in the reaction between compounds between two electronegative elements such as carbon and nitrogen to form cyanide.

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The coefficient of fe(oh)2 in the balanced redox equation is 2.

What is redox reaction?

Any chemical reaction in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction.

\(BrO- + H2O + 2e- > Br- + 2OH-\)

\(Fe(OH)2 + OH- > Fe(OH)3 + e-\)

\(BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3\)

The way of balancing is as follows

Step 1) divide the equations into two half reactions

oxidation half reaction                reduction half reaction

Fe(OH)2  --> Fe(OH)3                   BrO-  --> Br-

Step 2) balance atoms other than oxygen and hydrogen

Fe(OH)2  --> Fe(OH)3                    BrO-  --> Br-

Step 3) add OH- ions ,where the oxygen atoms are deficient, add the H2O molecules in required number to balance H atoms

 Fe(OH)2 + OH- --> Fe(OH)3            BrO-+H2O --> Br- + 2OH-

Step4) now add required number of electrons to balance the charge. don't forget the number of electrons loss in oxidation half reaction= the number of electrons gain in reduction half reaction

\(2Fe(OH)2 +2OH- -- > 2Fe(OH)3+2e-\)

\(BrO- + H2O +2e--- > Br- + 2OH-\)

Step5) now add the both half reactions ,re write

BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3.

Therefore, the coefficient of fe(oh)2 in the balanced redox equation is 2.

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The chemical equations, IUPAC name, and Structural formulas are given below.

i. Chemical equations:

a) Conversion of unsaturated compound B to compound C:

B + HBr → C (Addition of hydrogen bromide to unsaturated B to form bromohexane C)

b) Conversion of compound C to compound D:

C + Na + Ether → D (Reaction of bromohexane C with sodium metal in the presence of ether to form compound D)

ii. IUPAC names:

Compound C: Bromohexane

Compound D: Hexane

iii. Structural formulae of positional isomers of compound C:

Positional isomers of bromohexane can have different bromine atoms attached at different positions along the hexane chain. Here is an example of one positional isomer of bromohexane:

1-Bromohexane:

CH3CH2CH2CH2CH2CH2Br

2-Bromohexane:

CH3CH2CH2CH2CH2CHBr

3-Bromohexane:

CH3CH2CH2CH2CHBrCH3

Therefore, the chemical equations, IUPAC name, and Structural formulas are provided above.

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Answer:

Try everything

1. How many moles of nitrogen gas are in 1.54x10^26 molecules? How many atoms?

2. How many molecules of water are in 3.45 moles of water?

3. How many atoms of C are in 2.00 moles of Cv6Hv12Ov6? (v means the number is below)

Explanation:

Answer:

The molar mass and molecular weight of CCI2F2 is 315.8271.

Explanation:

The person's displacement is 6 meters eastward.The person walks 6 meters eastwards from the starting point (because they walked 12 meters east and then 6 meters west, thus 12-6=6 meters).

Therefore, the person's displacement is 6 meters eastward. This can also be represented by the equation:Displacement = (Final position) - (Initial position)Displacement

= (6 m east) - (0 m)Displacement

= 6 m eastward

In the given scenario, a person walks 12 meters towards the east and then 6 meters towards the west. To calculate the final position, we can subtract the distance traveled towards the west from the distance traveled towards the east.

So, the person's net displacement can be calculated as follows:

12 meters (east) - 6 meters (west) = 6 meters (east)

Therefore, the person ends up 6 meters east from their starting point.

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Answer:

D

Explanation:

Radioactivity means

the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei

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Answer:

≈ 0.70 g/cm³ (answer rounded up to 2 decimal places)

Explanation:

The mass of empty cylinder is 20g

The mass of water filling the cylinder = 30g - 20g = 10g

The mass of unknown liquid filling the cylinder = 27g - 20g = 7g

Density of water = 997 kg/m³

Converting this density to g/cm³ we get;

1kg = 1000g , 1m³ = 1000000cm³

So density = \(\frac{997000}{1000000}\) g/cm³ = 0.997 g/cm³

So the volume of water occupied by 10g is;

10 × 0.997 = 9.97 cm³

This volume is also occupied by 7g of the unknown liquid.

Density = mass/volume

Density of the unknown liquid = 7g ÷ 9.97cm³ = 0.702106319 g/cm³ ≈ 0.70 g/cm³ (answer rounded up to 2 decimal places)

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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The elements Bromine(Br) and Sulphur(S) undergo changes in oxidation number in the given reaction.

Given reaction:

\(2H_2SO_4(aq) + 2NaBr(s) - > Br_2(l) + SO_2(g) + Na_2SO_4(aq) + 2H_2O(l)\)

The elements that undergo changes in oxidation number are:

Bromine (Br):

In NaBr, the oxidation number of Br is -1.

In \(Br_2\), the oxidation number of Br is 0.

Sulfur (S):  

In \(H_2SO_4\), the oxidation number of S is +6.

In \(SO_2\), the oxidation number of S is +4.

All other elements in the reaction (H, O, Na) maintain a consistent oxidation number throughout the reaction.

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ClCH₂COOH is a stronger acid than BrCH₂COOH because the stability of the resulting carboxylate anions is influenced by the electronegativity of the substituent atom.
In general, the strength of an acid is determined by its ability to donate a proton (H+ ion). When comparing two carboxylic acids, ClCH₂COOH and BrCH₂COOH, we can observe that ClCH₂COOH is a stronger acid than BrCH₂COOH.

This is because the stability of the resulting carboxylate anions (ClCH₂COOH- and BrCH₂COOH-) is influenced by the electronegativity of the substituent atom. Chlorine (Cl) is more electronegative than bromine (Br), meaning it has a stronger pull on the shared electrons in the Cl-C or Br-C bond. This leads to a greater degree of electron density being pulled away from the oxygen atom in the carboxylate anion, resulting in a more stable anion.

Due to the greater stability of the carboxylate anion formed by ClCH₂COOH, it is able to more readily donate a proton, making it a stronger acid compared to BrCH₂COOH.

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Answer:

What are the Answer choices

In an equilibrium reaction, the forward and reverse reactions are proceeding at the same rate. option (d) is correct.

A Chemical equilibrium in a system is defined as a system in which the concentration of reactant and the concentration of  products do not change with time, also the system does not display kind of change in its properties.

When the rate of forward and backward reaction is same, the system is said to have reached a dynamic equilibrium. Here, the concentrations of reactants and products become equal.

There are two types of equilibrium: homogenous equilibrium, heterogeneous equilibrium.

In homogeneous equilibrium the reactants and products are in the same phase. Whereas, in heterogeneous equilibrium the reactants and products are in different phases.

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At equilibrium,  [CH₃NH] x [OH-]/[CH₃NH₃] expression equals the base dissociation constant (K) of  CH₃NH₂ .

Option C is correct .

Because CH₃NH₂ is more acidic than aniline due to the delocalization of a lone pair of electrons belonging to nitrogen, which results in resonance structures, CH₃NH₂ has a lower pKb value. As a result, aniline has a higher pKb value than  CH₃NH₂ .

The dissociation constant Kb is used to express the fundamental strength of amines. The base is stronger the higher the Kb value. The most frequent formulation is pKb=log Kb. Hence, the fundamental strength of the amine increases with decreasing pKb values.

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Answer:

A food web is many food chain combined. A food chain is most of the time a straight line unlike a food web.

The formal charge of a nitrogen atom that has no lone pairs and forms two double bonds is +1

The formal charge of an atom is calculated by subtracting the number of lone pair electrons and half the number of bonding electrons from the number of valence electrons.

Nitrogen having atomic number 7 and electronic configuration 1s²2s²2p³ has five valence electrons. If it forms two double bonds, then it is sharing four electrons with each bond, for a total of 8 electrons. This means that nitrogen has lost 3 electrons compared to the neutral atom, due to which it will have a formal charge of +1.

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The percentage of women with hypertension, defined as a diastolic blood pressure level above 90 mmHg, can be calculated using the standard normal distribution table.

To find the percentage, we need to calculate the z-score for a diastolic blood pressure of 90 mmHg using the formula:

z = (x - μ) / σ

where x is the diastolic blood pressure value, μ is the mean, and σ is the standard deviation.

In this case, x = 90 mmHg, μ = 70.2 mmHg, and σ = 10.8 mmHg.

Substituting these values into the formula, we get:

z = (90 - 70.2) / 10.8 = 1.833

Next, we need to find the corresponding area under the standard normal curve for a z-score of 1.833. By referring to the standard normal distribution table or using a calculator, we find that the area to the left of 1.833 is approximately 0.9664.

To determine the percentage of women with hypertension, we subtract this area from 1 and multiply by 100:

Percentage = (1 - 0.9664) × 100 ≈ 3.36%

Therefore, approximately 3.36% of women have hypertension based on the given diastolic blood pressure criteria.

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Answer:

Physical change

Explanation:

while the wax is melting its still wax no chemical change

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Answer:

c

Explanation:

the atomic number is 4 thus beryllium contains 4 protons and 4 electrons