MgCl2 + 2 NaOH → 2 NaCl + Mg(OH)2

If you want to produce 11.00 moles of MgCl2, how many grams of NaOH are needed for the reaction to take place ?

Answer:

A solute and a solvent mixed together.

Explanation:

A solution is a solute and a solvent mixed together. An example would be salt water. Salt would be the solute (the thing that's getting dissolved) and water would be the solvent (the thing that does the dissolving)

Answer:

4.50 L

Explanation:

First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:

Now, keeping in mind that

we can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:

So we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.

Answer:

2 moles of KOH are required.

Explanation:

Given data:

Moles of MgCl₂ = 1 mol

Number of moles of KOH react with MgCl₂ = ?

Solution:

Chemical equation:

MgCl₂  + KOH  → Mg(OH)₂ + KCl

Balanced chemical equation:

MgCl₂  + 2KOH  → Mg(OH)₂ + 2KCl

From balance chemical equation it can be seen when one mole of MgCl₂ react then 2 moles of KOH are required. It means double quantity of KOH is react with MgCl₂ in order to produced one mole of Mg(OH)₂ and 2 moles of KCl.

The above reaction also completely follow the la of conservation mas mass because there are equal number of atoms of reactant and products on both side of chemical equation.

Answer:

2 moles of KOH

Answer:

Explanation:

Steps mention in question are as follow.

Step 1: 2A <----> B ( fast)

Step 2: B + C ----> D (slow)

Overall: 2A + C ----> D

The slowest step is as follows

2A <----> B

Since the rate law is written as concentrations of reactants raised to power their stoichiometric coefficient multiplied by rate constant. Thus, rate law for this reaction can be written as follow.

Answer:

its sodium hydroxide

Explanation:

The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:

The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.

The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.

The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.

Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

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Answer:

Option D

Explanation:

Parent isotope has 83 protons, daughter isotope has only one more proton (84). Beta particle is very small, atomic mass of 212 stays the same in beta decay.

\(^2^1^2_8_3Bi\;\rightarrow\;^2^1^2_8_4Po\;+\;^0_-1e\) represents a beta decay. Parent isotope has 83 protons, daughter isotope has only one more proton (84). Beta particle is very small, atomic mass of 212 stays the same in beta decay.

In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide.

\(^2^1^2_8_3Bi\;\rightarrow\;^2^1^2_8_4Po\;+\;^0_-1e\)

In beta decay, one of the neutrons in the nucleus suddenly changes into a proton, causing an increase in the atomic number of an element.

Hence, option D is correct.

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The block’s average speed : 0.36 m/s

Distance is the length traveled by an object within a certain of time .  

Average speed = total distance/total amount of time ,

Can be formulated :

\(\tt avg.s(speed)=\dfrac{\Delta D}{\Delta t}\)

ΔD= total distance

Δt= total time

A block is pulled 0.90 m to the right in 2.5 s :

ΔD= total distance = 0.9 m

Δt= total time = 2.5 s

The block’s average speed :

\(\tt avg.s=\dfrac{0.9}{2.5}=0.36~m/s\)

Answer: A

Explanation:

Answer:

1.Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol. For example, the atomic mass of titanium is 47.88 amu or 47.88 g/mol. In 47.88 grams of titanium, there is one mole, or 6.022 x 1023 titanium atoms.

2.Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Let us take an example of H2O i.e. Water. Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams.

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

1. Negative

2. positive alpha

3. Gold

4. deflected

5. center

6. positive

7. positive

8. center

Hope this helps :)

Answer:

1.34 * 10^-7 M

Explanation:

The Ksp of lead II chromate is 1.8 x 10^-14

So, we have that;

PbCrO4(s) -----> Pb^2+(aq) + CrO4^2-(aq)

                             s                  s

Where s = molar concentration of Pb^2+(aq) and  CrO4^2-(aq)

and;

[Pb^2+] = [CrO4^2-]

This implies that Ksp = s^2

s = √Ksp

s = √1.8 x 10^-14

s = 1.34 * 10^-7 M

Answer:

Molality = 0.43 m

Explanation:

Given data:

Mass of barium sulfide = 25.4 g

Mass of water = 349 g (349 g/1000 = 0.349 Kg)

Molality of water = ?

Solution:

Number of moles of barium sulfide:

Number of moles = mass/molar mass

Number of moles = 25.4 g/169.39 g/mol

Number of moles = 0.15 mol

Molality:

Molality = number of moles o f solute/ Kg of solvent

Molality = 0.15 mol / 0.349 Kg

Molality = 0.43 m

The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called chemical kinetics.

What is Energy?

Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.

The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called reaction kinetics. Reaction kinetics is the study of how fast chemical reactions occur and what factors affect the reaction rate. It takes into account factors such as the nature of the reactants, concentration, temperature, surface area, and the presence of a catalyst or inhibitor.

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Answer:

\(yes\)

Explanation:

Iodine is present in salt which makes it salty:)

In the labelling of the circles; reaction A is a chemical reaction while reaction B is a nuclear reaction.

We know that in chemistry, the idea of change is quite central to our discussion. The change that we are talking about could be a chemical change or a physical change.

We have two circles that are in the Venn diagram that we have in the question. Before we can be able to label the two of the circles well we must have to remind ourselves of the differences between a chemical reaction and a nuclear reaction.

A chemical reaction result in the formation of new chemical species while the nuclear reaction would lead to the formation of new elements and the energy that is released in a nuclear reaction is far higher than the energy that is released from a chemical reaction.

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Answer:

heat is mesured in calories and also joules

Explanation:

The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

The amount of nitrogen-13 sample that remained after 60 minutes has been 25mg.

Half-life can be described as the time required by the substance to reduce half of its initial concentration.

The half-life of Nitrogen-13 has been 20 minutes. In 20 minutes, the sample will be reduced to half of its concentration,

The total time has been 60 minutes.

The number of half-life experienced by the sample has:

Number of half life= Total time/half life

Number of half life cycles= 60/20=3

The number of half-life cycles = 3

The sample has been reduced to 50% in the first half-life cycle and reduced to 25% by the end of 2nd half-life cycle.

The sample remained = 25% of the initial concentration.

The sample remained =  25/100.100 mg

The sample remained = 25 mg

Therefore, the amount of nitrogen-13 sample that remained after 60 minutes has been 25mg.

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Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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Answer:

Methyl Alcohol.

Acetate

Heptane

Dioxane

Explanation:

The boiling point of liquids are measure by observing the gas pressure or vapors temperature. There are few liquids whose boiling point is difficult to measure. The gas pressure differs for every liquid. It is important to observe the vapor pressure also to identify the boiling point. The most difficult boiling point identification is for Methyl alcohol as it has ability to absorb different level of pressure.

The liquids are Methyl Alcohol, Acetate, Heptane,Dioxane

Information regarding the liquids:

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Answer:

C3H8 + 502+3CO2 + 4H20

Explanation:

In order to get this answer you would have to would balance out the carbons on the products side by multiplying CO2 by 3. The new equation will be 

C3H8 + 02 ----> 3CO2 + H20

Now, that the carbons are balanced, we will look at the hydrogens. We can multiply the number of waters on the product side by 4, to make 4 H20 molecules. This gives both sides of the equation 8 hydrogens. Next we can check our oxygens. There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. 

Answer:

Volume of bacteria cell into Pico liters = 60.27 Pico liters

Explanation:

Given:

Volume of bacteria cell = 6.027 x 10⁻¹⁰ L

Find:

Volume of bacteria cell into Pico liters

Computation:

1 L = 10¹² Pico liters

So,

Volume of bacteria cell = 6.027 x 10⁻¹⁰ L

Volume of bacteria cell = 6.027 x 10⁻¹⁰ x 10¹² Pico liters

Volume of bacteria cell into Pico liters = 60.27 Pico liters

Answer:

12000 joules

Explanation:

due to enthalpy of fusion

Answer:

626.3K or 353.15°C

Explanation:

We will be using the Combined Gas Law for this problem. The Combined Gas Law (as you guessed it!) combines Boyle's Law, Charles' Law, and Gay-Lussac's Law into a single equation for situations where P, V, and T all vary. It expresses the relationship between pressure, volume, and temperature of a fixed amount of gas. Remember, it allows calculations where only the amount of gas is constant.

Note: When using this law, temperature (T) MUST be in Kelvin Temperature. I can't stress how important it is to convert the temperature value into Kelvin degrees because forgetting to do so will mess up your answer.

Combined Gas Law: \(\frac{ P_{1}*V_{1}}{T_{1}} = \frac{ P_{2}*V_{2}}{T_{2}}\)

In this problem, all of the values for the left side of the equation are given: P1 = 0.5 atm, V1 = 0.50L, and T1 = 40°C + 273.15 = 313.15K. For the right side of the equation, we are given the volume and pressure of the expanded gas and are told to find the new temperature (T2): P2 = 0.10 atm and V2 = 5.0L. Because the pressure and volume for both sides of the equations are provided in the same unit, there is no need for conversions.

Now onto the math - all that is needed to be done is plugging in the values and solving for T2. The work is shown below:

Set up: \(\frac{0.5atm * 0.50L}{313.15K} = \frac{0.10atm * 5.0L}{T_{2}}\)

==> \((\frac{0.5atm * 0.50L}{313.15K} )T_{2}= (0.10atm)(5.0L)\)

==> \(T_{2}= (0.10atm) (5.0L)(\frac{313.15K}{(0.5atm)(0.50L)})\)

==> \(T_{2} = 626.3K\)

At this point, you can leave your answer as 626.3K. However, because the temperature of the original gas was given in Celsius, I would recommend converting it back to that provided unit. So, our final step is: 626.3K - 273.15 = 353.15°C.

\(\rule{100}{3}\)

Multicellular Plants and animals have organs with specific function.

Which structures do eukaryotic cells have for performing functions?

Ans:-

Organelles

\(\rule{100}{3}\)

Which process takes place with in mitochondria?

Ans:-

Cellular Respiration

Answer:

The ribosomes on the rough endoplasmic reticulum (ER) use the RNA to create different types of proteins needed by the body. These proteins are then modified, packaged, and transported by the endomembrane system, which includes organelles such as the Golgi apparatus and lysosomes

Answer:

the method used is physical

Answer:

\(T_{sol}=-15.9\°C\)

Explanation:

Hello,

In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

\(T_{sol}=T_{water}-i*m*Kf\)

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

\(m=\frac{mol_{solute}}{kg\ of\ water}=\frac{45.0g*\frac{1mol}{62g} }{85.0g*\frac{1kg}{1000g} } =8.54m\)

Thus, we obtain:

\(T_{sol}=0\°C+(-8.54m*1.86\frac{\°C}{m} )\\\\T_{sol}=-15.9\°C\)

Best regards.

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

Freezing point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

We will use the definition of molality.

b = mass of solute / molar mass of solute × kg of solvent

b = 45.0 g / 62.07 g/mol × 0.0850 kg = 8.53 m

We will use the following expression, where Kf is the cryoscopic constant of water.

ΔT = Kf × b = 1.86 °C/m × 8.53 m = 15.9 °C

The freezing point of pure water is 0°C.

T = 0°C - 15.9 °C = -15.9 °C

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

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Hydrogen bond is not formed between carbon and hydrogen. That is option B.

Hydrogen bond can be defined as the type of bond that is characterized to be a weak force that forms a special type of dipole-dipole attraction which occurs when a hydrogen atom bonded to a very electronegative atom such as a Nitrogen, Oxygen or Fluorine.

The combination of carbon and hydrogen is through a chemical bond called covalent bond which can occur between carbon and hydrogen atoms that can be found in many organic compounds (these are compounds that are made up of mainly carbon and hydrogen atoms).

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