Can I get help on this ASAP please!

Answer:

1.

Mass solution = 28.65 g

Mass percent = 9.14 %

2.

Mass solute = 1.95 g

Mass solution = 48.75 g

3.

Mass solvent = 24.52 g

Mass percent = 6.41 %

4.

Mass solution = 476.8 g

Mass solvent =450.1 g

Explanation:

Hello,

In this case, we define the mass percent as:

[tex]\%m/m=\frac{m_{solute}}{m_{solute}+m_{solution}} *100\%[/tex]

Wherein we use the mass of the solute and the mass of the solvent in order to compute it, thus, for each case we have:

1.

Mass solution: 2.65 g + 26.0 g = 28.65 g

Mass percent: 2.62 g / (2.65 g + 26.0 g) x 100% = 9.14 %

2.

Mass solute: 4.0 % x 46.8 g / (1 - 4.0 %) = 1.95 g

Mass solution: 1.95 g + 46.8 g = 48.75 g

3.

Mass solvent: 26.2 g - 1.68 g = 24.52 g

Mass percent: 1.68 g / (1.68 g + 24.52 g) x 100% = 6.41 %

4.

Mass solution: 26.7 g / 5.6 % = 476.8 g

Mass solvent: 476.8 g - 26.7 g =450.1 g

Best regards.

Answer:

20.9

Explanation:

Answer:

8.90g

Explanation:

2×O=2×16.00=32.00g

mass=0.278×32.00g=8.90g

Answer:

5.5 amps

Explanation:

V = I*R

110 = 20I

I = 5.5

Answer:

See below

Explanation:

The process through which DNA replicates itself in the course of the cell division shall be DNA replication. There was a mistake. A 'Y' shape is generated by the separation of the two individual DNA strands called a 'field' replication. These two different strands act as models for the creation of new DNA strands

Hope this helps.

Answer:

[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]

Explanation:

Hello,

In this case, the described chemical reaction is:

[tex]H_2S+Ga(ClO_3)_3\rightarrow Ga_2S_3+HClO_3[/tex]

After balancing, we must assure the same quantity of atoms of all the elements at both reactants and products:

[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]

Thus, we find two galliums, three sulfurs, six chlorines, six hydrogens and eighteen oxygens at both reactants and products.

Best regards.

Answer:

single replacement reaction

Explanation:

This is a kind of single replacement reaction where you switch either cations or anions. Here you switched Ca for H and produced Cacl2 and H2 gas by itself.

Answer:

It is a displacement reaction

Answer:cathode

Explanation:It is also known as the galvanic cell or electrochemical cell. In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.

Answer:

the structural units are anions and cations bonded together by strong, non-directional ionic bonds

Answer:

C.

Explanation:

In C.) Tyler is not suggesting that one race is better than another he is only suggesting his own non biased opinion on what courses should be taught at his school.

Answer:

Explanation:

C

Answer:

2Fe(s) + O₂(g) + 2H₂O(l) → 2Fe(OH)₂(s)

Explanation:

Balanced equation willl be:

[tex]2Fe(s) + O_2(g) + 2H_2O(l) - > 2Fe(OH)_2[/tex]

A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.

On a separate sheet of paper, make a claim in which you mathematically state the rule of balance - that is, the rule that one must use to determine if two weights placed on opposite sides of the fulcrum will balance each other.

Learn more about Balacing a Chemical Equation here

https://brainly.com/question/26227625

#SPJ2

Answer:

Hexane

Explanation:

These are hydrocarbons from the same group with general formula CnH2n+2.

So, the more molecular mass are (the more number of carbons) the higher boiling point will be.

Hexane has the most number of carbon atoms(6) , so the highest molecular mass and the highest boiling point.

Answer:

What does a particular point on a line of a phase diagram represent ?

Explanation:

The lines on the phase diagram represent combinations of pressures and temperatures at which two phases coexist in equilibrium.

The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.

A phase diagram shows a visual representation of particular chemical-physical states across various pressures and temperatures.

A phase would be an area of space where a molecule's physical characteristics have been all essentially uniform.

The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.

To know more about the phase diagram

https://brainly.com/question/16945664

#SPJ2

Answer:

Here's what I get  

Explanation:

A. Prepare Ca(NO₃)₂ solution

Scoopula  — to transfer the solid to an Erlenmeyer flask

Erlenmeyer flask — to hold the solid for weighing and to prepare the solution

Volumetric flask — to hold the liquid

Funnel — to transfer the solution to the volumetric flask

Wash bottle — to fill the volumetric flask to the mark

B. Weigh K₂SO₄

Scoopula  — to transfer the solid to a weighing bottle

Weighing bottle — to hold the solid for weighing.

C. Add acetic acid to a volumetric flask

Volumetric flask — to hold the acid

Pipet —to measure out the acid and transfer it to the flask

Pipet bulb — safety feature for the pipet and for control of the acid volume.

D. Add NaOH to an acid

Beaker — to hold the NaOH solution

Ring stand — to hold a buret  

Buret clamp — to hold the buret

Funnel — to transfer the solution to a buret

Buret — to hold the NaOH solution for addition to the acid

Answer:

Explanation:

check the image

a)

The workdone on the gas during during the isobaric compression

W = pΔV

= nRΔT

= 2 * 8.314 * (273-110)

=2710J

b) The workdone on the gas during during the isothermal expansion

[tex]W= nRT_fIn(\frac{V_f}{V_i} )\\\\2*8.314*110In\frac{110}{273} \\\\=-1662.6J[/tex]

Answer:

a) The work done during the isobaric compression is 4060.91 J.

b) The work done during the isothermal expansion is 2489.58 J.

Explanation:

a) Here we have two different processes. We calculate the work done during the isobaric compression using the following formula:

[tex] W= -P. (V₂ - V₁) [/tex]

Since the process is isobaric, the pressure is constant. First we need to find this value. In order to do that, we use the ideal gas equation:

[tex] p.V= n.R.T [/tex]

[tex] p= [n.R.T] ÷ V = [3 mol × 0.082 (L.atm÷mol.K) × 273 K] ÷ 3 L [/tex]

p = 22.39 atm

Now, we need to find V₂. We do this using Charles' law:

[tex] V₁/T₁ = V₂/T₂ [/tex]

[tex]  V₂ = V₁/T₁ × T₂ = 3 L ÷ 273 K × 110 K [/tex]

V₂ = 1.21 L

Now we are in condition to calculate the work done during the isobaric compression:

[tex] W= -P. (V₂ - V₁) [/tex]

[tex] W= -22.39 atm. (1.21 - 3) L [/tex]

W= 40. 07 L.atm

We multiply this value by 101.325 to convert it to joules: W= 4060.91 J

b) To calculate the work done during the isothermal expansion, we use the following equation:

[tex] W = n.R.T. ln (V₂/V₁) [/tex]

[tex] W = 3 mol ×0.082 (L.atm/mol.K) × 110 K × ln (3L / 1.21 L) [/tex]

W= 24.57 L.atm

We convert this value to joules: W= 2489.58 J

Answer:

See explaination

Explanation:

please kindly see attachment for the step by step solution of the given problem

Answer:

Explanation:

 [ H⁺] = 3.5 x 10⁻⁶ M .

[ H⁺] [ OH⁻] = 10⁻¹⁴

[ OH⁻] x 3.5 x 10⁻⁶ = 10⁻¹⁴

[ OH⁻] = 2.857 x 10⁻⁹ M .

Answer:

White school glue is liquid because its long polymers can slide over and along one another. It does not flow easily, though; it is quite viscous. The addition of some chemicals—such as a borax solution (or sodium tetraborate decahydrate dissolved in water)—can cause cross-links to form between the polymers.

Explanation:

Answer:

It is a liquid :]

Answer:

A) It indicates the direction in which the reaction occurs.

Explanation:

The reason we don't use equals signs (=) in chemical reactions is because of the Identity Property of Equality (if a = b then b = a), which would allow us to reverse reactions. Reactions can't just be reversed (since some don't even occur); we need to know what is reacting to make what. Thus, we use the arrow, or yields symbol to denote this.

The substances to the left of the sign are the reactants, the ones that are reacting, and the ones on the right are the products, the ones that are being produced from the reactants. The arrow is an excellent way to represent the direction the reaction occurs in as the way it's written clearly demonstrates direction.

Hope this helps!

Answer:

(a)

From surrounding to wax

(b)

Q = 2.62 KJ

(c)

Density of a substance is defined as the no. of particles of the substance, that occur in a unit volume. So, when the substance melts, the inter-molecular attractive forces and bonds between molecules or atoms are weakened. This, increases the distance between the molecules or atoms. Hence, the no. of particles in a unit volume is decreased. As, a result of this, the density of the substance also decreases.

Explanation:

(a)

During the melting process, the solid material or substance requires energy, in order to break the bonds between its molecules or atoms.

Therefore, while the wax is melting, the net flow of thermal energy is from surrounding to the wax.

(b)

The amount of energy required to melt solid paraffin wax is given by the formula:

Q = nC

where,

Q = amount of energy

C = Molar Heat of Fusion = 48.78 KJ/mol

n = No. of Moles = Mass in gram/Molar Mass = (15.2 g)/(282.62 g/mol)

n = 0.0538 mol

Therefore,

Q = (0.0538 mol)(48.78 KJ/mol)

Q = 2.62 KJ

(c)

Density of a substance is defined as the no. of particles of the substance, that occur in a unit volume. So, when the substance melts, the inter-molecular attractive forces and bonds between molecules or atoms are weakened. This, increases the distance between the molecules or atoms. Hence, the no. of particles in a unit volume is decreased. As, a result of this, the density of the substance also decreases.

(a) During the melting of wax, the flow of thermal energy has been from the surroundings to the wax.

(b) The amount of heat requires for the melting of 15.215 grams of solid paraffin has been 2.62 kJ.

(c) The density decreases due to a decrease in the number of molecules per unit volume.

(a) Melting results in the conversion of solid-state to the liquid state. This step requires energy. Thus, the flow of energy has been from the surroundings to the wax.

(b) Amount of heat requires (Q) can be given by:

Q = nC

Where, n = moles of the sample, and C = heat of fusion

Moles of paraffin = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]

Moles of paraffin = [tex]\rm \dfrac{15.215}{286.62}[/tex]

Moles of paraffin = 0.0538 moles

Q = 0.0538 [tex]\times[/tex] 48.78 kJ/mol

Q = 2.62 kJ.

The amount of heat requires for the melting of 15.215 grams of solid paraffin has been 2.62 kJ.

(c) The density has been the mass or number of particles present per unit volume. The melting of wax results in a weaker intermolecular force. The resulting liquid will have fewer molecules present in the unit volume.

Thus, the density decreases due to a decrease in the number of molecules per unit volume.

For more information about the heat of fusion, refer to the link:

https://brainly.com/question/14053504

Answer: The reaction rate will DECREASE.

Explanation:

Chemical reaction occurs through the combination of chemical reactants to form new products. The rate if this reaction is affected by the following factors:

- the chemical nature of the reacting substances,

- the state of subdivision (one large lump versus many small particles) of the reactants,

- the temperature of the reactants,

- the concentration of the reactants, and

- the presence of a catalyst.

When additional liter of pure water is added to the reaction mixture, collision between reactant molecules is reduced The dilution causes the concentration of the reactants to reduce. This in turn affects the rate of chemical reactions as the decreased concentration of reactants leads to a decrease in the reaction rate.

Answer:

One will give you more energy and the other will make you tired!

Explanation:

Answer:

Nitrifying bacterium such as nitrosomonas or nitrobacter, whe applied to the soil, convert free ammonia or nitrogen to nitrates through oxidation. They are a group of aerobic bacteria playing an important role in the nitrogen cycle as producers of energy from inorganic source.

The schematic diagram attached summaries the action of such bacteria.

Answer:

a

Explanation:

the others are rude, and rather support this, while a helps to support the ending of white privlige

Answer:

A. Definitely!

Explanation:

If everyone says that in other country that's worst and let it go, racism will never stop! Saying that people of color are overly sensitive is also racist because everyone can be sensitive. There color of skin change nothing! They are humans like everyone and if they want to defend themself, they have the right! Racism still exist and it needs to stop after all these years of sufferance and pain. White people are not better that people of color. Everyone deserve to be equal. Thank you.

Answer:

A gas sample into a vacuum diffuses faster than a gas sample into an air-filled container.

Explanation:

Diffusion

When a gas is introduced into a closed space, the molecules of the gas move freely and spread throughout the closed space.

The gas molecules tend to move from higher concentration to lower concentration area so that the concentration of gas throughout the closed space comes in equilibrium. This happens because higher concentration spaces have a greater number of gas molecules and vice-versa. In other words, gas molecules move towards the spaces having less concentration, i.e., they have a smaller number of gas molecules, and hence, can accommodate additional gas molecules.

This process of dispersion of gas molecules, as a result of difference in concentration, is called diffusion. The speed of diffusion is affected by the collisions suffered by the gas molecules.

When the molecules of gas disperse in any space, they have a tendency to travel in a straight line. In this process, they hit the molecules of other gases in the same space which causes a decrease in the speed of the molecules of gas hence, slowing the process of dispersion or diffusion.

Diffusion in air-filled container

When a gas is introduced into a closed container which is already filled with air, the molecules of the newly-introduced gas, as per their tendency, tend to move throughout the closed container irrespective of the concentration gradient.

Diffusion in a vacuum container

Whereas, in vacuum, the molecules of the introduced gas do not face any collisions with any molecules of other gas. The molecules of gas move freely until they collide with the sides of the container. The only collision occurring in a vacuum container is when the molecules hit the containers. Hence, gas diffusion takes place faster in a closed container having vacuum than a closed container which is already filled with air.  

Answer:

The correct answer is 0.300 * 10^23 ions.

Explanation:

Based on the given question, there is a need to find the number of chloride ions in the mentioned 6.8 grams of zinc chloride compound.  

The moles of zinc chloride (ZnCl2) is,  

= mass of zinc + 2 mass of chlorine

= 65.38 + 2 (35.45)

=65.38 + 70.90

= 136.28 grams (The molecular mass of zinc is 65.38 and the molecular mass of chlorine is 35.45)

Thus, 136.28 g of ZnCl2 contains 70.90 grams of chlorine

Therefore, 6.8 grams of ZnCl2 will comprise = (70.90/136.28) * 6.8

= 3.537 g of chlorine

70.90 g of Cl comprise 6.022*10^23 chlorine, thus, 3.537 g of Cl will comprise (6.022*10^23/70.90) * 3.537

= 0.300 * 10^23 ions of chlorine.  

Answer: 1) [tex]RCOO^-[/tex]

2) [tex]H_2PO_4^-[/tex]

3) [tex]RNH_2[/tex]

4) [tex]HCO_3^-[/tex]

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

1) [tex]RCOOH\rightarrow RCOO^-+H^+[/tex]

Here, [tex]RCOOH[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]RCOO^-[/tex] which is a conjugate base.

2) [tex]H_3PO_4\rightarrow H_2PO_4^-+H^+[/tex]

Here, [tex]H_3PO_4[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]H_2PO_4^-[/tex] which is a conjugate base.

3) [tex]RNH_3^+\rightarrow RNH_2+H^+[/tex]

Here, [tex]RNH_3^+[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]RNH_2[/tex] which is a conjugate base.

4) [tex]H_2CO_3\rightarrow HCO_3^-+H^+[/tex]

Here, [tex]H_2CO_3[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]HCO_3^-[/tex] which is a conjugate base.

Answer:

120

Explanation:

Because it starts as gas at from A to B, B to C is gas and liquid equilibrium, so in order to go to boiling point (point where it goes from liquid to gas) it happens at 120 because after that you see that steep slope which represents the gas being formed.

The transition from liquid to gas, or the boiling point, occurs at 120 because after that you see that steep slope, which symbolizes the gas being formed. This is because the transition from liquid to gas, or the boiling point, occurs at 120 because it starts as a gas at A to B, B to C is gas and liquid equilibrium.

The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a material. A liquid's boiling point changes according on the atmospheric pressure in the area.

A cooling curve is a line graph that depicts the transition of matter from one phase to another, usually from a liquid or gas to a solid. Time is an independent variable (X-axis), while temperature is a dependent variable (Y-axis).

Thus, the boiling point of the substance is 120° c.

To learn more about boiling point follow the link below;

https://brainly.com/question/2153588

#SPJ2

Answer:

The three parts of the seed are the embryo, endosperm and the seed coat.

Explanation:

The embryo is the young multicellular organism before it emerges from the seed. The endosperm is a source of stored food which consists mostly of starches. The seed coat consists of one or more protective layers that encase the seed.

Hope this helps x

Answer:

a specific amount edta is added to a specific amount of distilled water

Explanation:

Answer:

The pH of the solution is 1.34, being an acidic pH.

Explanation:

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.   The acronym pH stands for hydrogen potential.

The pH scale ranges from 0 to 14. Values ​​less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral. Mathematically, pH is the negative logarithm of the molar concentration of hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺).

pH= - log [H⁺] = - log [H₃O⁺]

In this case, [H⁺]= 4.6*10⁻² M. Replacing:

pH= - log 4.6*10⁻²

Solving:

pH= 1.34

The pH of the solution is 1.34, being an acidic pH.