Oil is
so it will
dissolve in water.

Answer:

0.172 M

Explanation:

The reaction for the first titration is:

First we calculate how many HCl moles reacted, using the given concentration and volume:

As one HCl mol reacts with one NaOH mol, there are 3.704 NaOH mmoles in 25.0 mL of solution. With that in mind we determine the NaOH solution concentration:

As for the second titration:

We determine how many NaOH moles reacted:

Then we convert NaOH moles into H₃PO₄ moles, using the stoichiometric coefficients:

Finally we determine the H₃PO₄ solution concentration:

Nitrous oxide decomposes into nitrogen and oxygen, according to 2 N2O (g) -> 2 N2 (g) + O2 (g). ... In an experiment, a stream of N2O is passed through a tube 25 mm in diameter and 20 cm long. The flow rate of the gas is 0.75 L/min.

Answer:

3.92%

Explanation:

The solution that is formed is of KCl in water. This means that the percent composition by mass is given by the formula:

We now calculate the mass of solution:

Finally we calculate the percent composition:

Answer:

Explanation:

First we convert 134 lb into kg:

Then we convert 275 mg into g:

Now we can calculate the dosage in grams per kilogram of body weight, keeping in mind that two tablets are consumed:

As for the second part, first we convert 31 lb into kg:

Now we calculate how many penicillin grams should be consumed:

We convert 1.27 g of penicilin into mg:

Finally we calculate how many 150 mg tables should be taken:

Solar energy:-

In this way the energy generated through sun light with the help of solar panels and to be used in many works.

Wind energy:-

This is generated by moving turbines with windmills .It is used to create electric energy

Answer:

pH = 3.3

Explanation:

Step 1: Given data

Concentration of hydronium ions in the agricultural product ([H₃O⁺]): 4.7 × 10⁻⁴ M

Step 2: Calculate the pH of the agricultural product

We will use the definition of pH.

pH = -log [H₃O⁺]

pH = -log 4.7 × 10⁻⁴

pH = 3.3

Since the pH < 7, the agricultural product is acidic.

Answer:

yes

Explanation:

cuz is a square and if all angles are equal of a square then it is correct

Answer:

d

Explanation:

Answer:

1. lakes and rivers 2. groundwater 3. watershed 4. pollution

Explanation:

Explanation:

because there is 2 hydrogen atoms in the reactions side of the equation (you can tell because the H has a 2 in the subscript) you have to have 2 hydrogen atoms in the reactants side to help balance out the equation. and since the copper and oxygen atoms are already balanced there is no coefficient needed.

Answer:

solution given:

log k=4-[tex] \frac{200}{t} [/tex]

so,

On comparison

∆S°/R = 4

∆ S° = 4R

mousam brother is correct

hope it helps you have a good day

Answer:

This reaction has infinite ways to be balanced

Explanation:

To balance this equation we can use the algebraic method:

N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)

Where we write each molecule as a letter:

A + B → C + D + E

Then, we write the equations according the number of atoms of each molecule. That is:

Oxygen → 4A + B = C + 2D + 2E (1)

Nitrogen → 2A = C + E (2)

Carbon → B = D (3)

Then, we have to give 1 arbitral number for a letter. For example:

B = 1; D = 1

(1) 4A + 1 = C + 2 + 2E

4A = C + 2E + 1

2A = C + E (2) Twice (2):

4A = 2C + 2E

Subtracting (1) in (2)

C + 2E + 1 = 2C + 2E

C + 1 = 2C

1 = C

Si 1 = C:

4A + 1 = 1 + 2 + 2E

4A = 2 + 2E (1)

y:

2A = 1 + E (2)

Twice:

4A = 2 + 2E

As (1) and (2) are the same equation:

For example:

N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)

Answer:

C

Explanation:

I got this question right on my test.

Answer:A

Explanation:

Answer:

CaCl₂

Explanation:

First we convert the given masses of elements into moles, using their respective molar masses:

Now we divide those numbers of moles by the lowest value among them:

Meaning the empirical formula for the compound is CaCl₂.

Answer:

[tex]28.037\ \text{s}[/tex]

Explanation:

[tex][A]_0[/tex] = Initial concentration = 1.28 M

[tex][A][/tex] = Final concentration = [tex]0.17[A]_0[/tex]

k = Rate constant = 0.0632 s

t = Time taken

For first order reaction we have the relation

[tex]kt=\ln\dfrac{[A]_0}{[A]}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{[A]}}{k}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{0.17[A]_0}}{0.0632}\\\Rightarrow t=28.037\ \text{s}[/tex]

Time taken to reach the required concentration would be [tex]28.037\ \text{s}[/tex].

Answer:

begins in the mouth

Answer:

14x6.02x10^23=8.428x10^23 atoms

Answer:

atoms are in 14 moles of cadmium. Cadmium is present in some foods and is emitted when fossil fuels like as coal and oil is used, smoking cigarettes. It is used in craft glazes, metal batteries, and coatings. We know that 1 mole of Cadmium (Cd contains) 6.023*1023 atoms, which is Avogadro's number

Explanation:

Answer:

[tex]296.05\ \text{K}[/tex]

Explanation:

[tex]m_w[/tex] = Mass of water = 100 g

[tex]c_w[/tex] = Specific heat of water = [tex]4.184\ \text{J/g K}[/tex]

[tex]m_c[/tex] = Mass of copper = 20 g

[tex]c_c[/tex] = Specific heat of copper = [tex]0.385\ \text{J/g K}[/tex]

[tex]\Delta T_w[/tex] = Temperature change in water = [tex](T-295)[/tex]

[tex]\Delta T_c[/tex] = Temperature change in cooper = [tex](353-T)[/tex]

T = Final temperature of the system

The heat balance of the system is given by

[tex]m_wc_w\Delta T_w=m_cc_c\Delta T_c\\\Rightarrow 100\times 4.184\times (T-295)=20\times 0.385\times (353-T)\\\Rightarrow 418400\left(T-295\right)=7700\left(353-T\right)\\\Rightarrow 418400T-123428000=2718100-7700T\\\Rightarrow T=\frac{1261461}{4261}\\\Rightarrow T=296.05\ \text{K}[/tex]

The final temperature of the water is [tex]296.05\ \text{K}[/tex].

The final temperature of the water when placed in a calorimeter is 296.05K

HOW TO CALCULATE FINAL TEMPERATURE:

Where;

Learn more at: https://brainly.com/question/10987564?referrer=searchResults

Answer:

63.7 °C

Explanation:

Step 1: Given and required data

Step 2: Calculate the final temperature of the water (T₂)

We will use the following expression.

Q = c × m × (T₂ - T₁)

T₂ = Q/c × m + T₁

T₂ = 3.85 × 10³ cal/(1 cal/g.°C) × 75.4 g + 12.6 °C = 63.7 °C

The more energy that particles have, the more they move.

Answer:

They demonstrated that carbon-11 decays by positron emission to the stable nuclide 11B [Eq. (1)].

Answer:

4.90 g

Explanation:

Given that:

volume of t-pentyl alcohol = 5 mL

the standard density of t-pentyl alcohol = 0.805 g/mL

Recall that:

density = mass(in wt) /volume

mass = density × volume

mass = 0.805 g/mL × 5 mL

mass = 4.03 g

Volume of HCl used = 12 mL

The reaction for this equation is shown in the image attached below.

From the reaction,

88.15 g of t-pentyl alcohol reacts with concentrated HCl to yield 106.59 g pf t-pentyl chloride.

4.03 g of t-pentyl alcohol forms,

[tex]= \dfrac{106.59 \ g \times 4.03 \ g}{88.15 \ g}[/tex] of t-pentyl chloride.

Therefore,

Theoretical yield of t-pentyl chloride = 4.90 g

Answer:

58.6 g.

Explanation:

Hello there!

In this case, since the molecular formula of lithium thiocyanate is LiCNS and therefore its molar mass is 65.1 g/mol, it possible to perform the calculation of the mass of 0.900 moles of this substance by recalling the following equivalence statement:

1 mol =  65.1 g.

Thereby, we can calculate the required mass as shown below:

[tex]0.900mol*\frac{ 65.1g}{1mol}\\\\58.6 g[/tex]

Best regards!

Answer:

600 mL

Explanation:

From the question given above, the following data were obtained:

Initial concentration (C₁) = 6 M

Initial volume (V₁) = 50 mL

Final concentration (C₂) = 0.5 M

Final volume (V₂) =?

Using the dilution formula (i.e C₁V₁ = C₂V₂) we can obtain the final volume as illustrated below:

C₁V₁ = C₂V₂

6 × 50 = 0.5 × V₂

300 = 0.5 × V₂

Divide both side by 0.5

V₂ = 300 / 0.5

V₂ = 600 mL

Thus, the final volume is 600 mL

Answer:

Static energy is an energy between two charges.

Explanation:

a). A van de Graff generator builds up a positive electric charge on the dome by separating the negative static electric charges from the positive static charge using a quickly moving belt. The positive charge collects on the large metal dome of the generator. When the charge builds up is large enough, a lighting like spark can shoot from the dome to a grounded discharge rod.

             Like electric charges always repel each other, and oppositely electric charges will attract each other. When the aluminum pans are being charged by the van de Graff generator, then each of them attain the same positive polarity similar with the dome. Thus,  positive charge starts to accumulate over the surface of each of the pie pan. Each aluminum pan repels the others. These repulsive forces between the pans are so strong that they succeed in overcoming the gravity force and thus the top of the pan is pushed away from the generator's dome.

b). Static electricity is produced by a concentration of negative and positive electric charges. Like charges pushes away each other while unlike charges pulls each other.

            Objects generally have same numbers of positive charges as well as negative charges. And if there is any small imbalance in numbers of the charges on the object, it is charged.

            Negative charges easily torn away from the materials like the fur or hair. Also, the negative charges are held on other materials like the plastics. If we rub a plastic rod with fur, the negative charges will get transferred from fur to rod. The rod gets negatively charged and the fur is positively charged. As a result, the rabbit fur and the plastic rod were attracted to each other.

c). Coulomb's law stated that :

  [tex]$F=\frac{KQ_1Q_2}{d^2}$[/tex]    .............(i)

where, [tex]$Q_1$[/tex]  and [tex]$Q_2$[/tex] are the charges of two objects d is the distance between two objects.

As from the above equation, we can say that force of electrical attraction between two objects depends on the charges and the distance between objects.

1. The electrical force between two charged object is inversely proportional to the distance of separation between two objects.

Decreasing separation distance (d) between the objects will increase its attraction force.

2. And, increasing the charges of two objects(+ve and -ve) increases the force of attraction between two objects.

Answer: yes they come in different colors.

Explanation:

Most shades of soil is mostly black,brown,red,gray,and white the color of soil and other properties including texture, structure, and consistency are used to distinguish and identify soil.

Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.