Please help!

Fill in the blank

Answer:

Pupa Stage

Explanation:

Silk worm consists of four stages- the adult, the egg, the larva (caterpillar) and the pupa stage.

The type of glass that has been exposed to high temperatures and shatters into tiny pebble-like fragments when it breaks is called tempered glass.

Tempered glass is a type of safety glass that has been treated with heat and chemicals to make it stronger and more durable than regular glass. When it breaks, it shatters into small, rounded fragments that are less likely to cause injury than the sharp shards produced by regular glass. Tempered glass is commonly used in applications where safety is a concern, such as car windows, shower doors, and storefront windows. It is also used in the construction of buildings, furniture, and appliances.

To know more about temperature

https://brainly.com/question/11464844

#SPJ4

Answer: It would be .250

Explanation:

Gases are much more compressible than liquids or solids, gases have relatively low density.

Mass per unit volume is measured using the density unit. Given that it is an intense property, the size of the item has no bearing on the value of the property. Density Physics-related meaning The mass-to-volume ratio of an object is known as its density in physics. Mass per unit volume is a frequent definition. Chemistry's use of density The density of a substance in chemistry is a measurement of how much mass there is per unit volume. It is a physical characteristic that is intense, which means that the size of the object has no bearing on its value.

Which of the following statements correctly describe the properties of gases? select all that apply:

-gases have high viscosities

-gases are much more compressible than liquids or solids

-gases have relatively low densities

-gases mix with other gases only if their molecules are of the same type

Learn more about density here:

https://brainly.com/question/29775886

#SPJ4

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

learn more about contaminated here

https://brainly.com/question/465199

#SPJ11

The standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

What do you mean by standard reaction entropy?

Standard reaction entropy (ΔS°) is a measure of the disorder or randomness of a chemical reaction at a constant temperature and pressure. It is defined as the change in the entropy of the system when a reaction occurs under standard conditions. The standard state for a substance is its pure form at a pressure of 1 bar and a temperature of 25°C (298 K).

The standard reaction entropy (ΔS°) of a reaction can be calculated using the standard molar entropies (S°) of the reactants and products. The formula to calculate the standard reaction entropy is:

ΔS° = ΣS° (products) - ΣS° (reactants)

To calculate the standard reaction entropy for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)

S° (N2) = 191.8 J/K·mol

S° (H2) = 130.6 J/K·mol

S° (NH3) = 192.5 J/K·mol

ΔS° = [2(S° (NH3)) - (S° (N2) + 3(S° (H2))]

ΔS° = [2(192.5) - (191.8 + 3(130.6))] J/K·mol

ΔS° = -196.3 J/K·mol

Hence, the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

To learn more about standard reaction entropy from the given link:

https://brainly.com/question/16795263

#SPJ4

The time (in days) required for the magnesium block to offer cathodic protection of the pipeline is 656 days

First, we shall obtain the charge for 5.35 Kg of magnesium, Mg. Details below:

Mg²⁺ + 2e —> Mg

From the balanced equation above,

24.3 g of magnesium, Mg required 193000 C of electricity

Therefore,

5.35 Kg (i.e 5350 g) of magnesium, Mg will require = (5350 × 193000) / 24.3 = 42491769.55 C of electricity

Now, we shall determine the time required. This can be obtained as follow:

Q = It

42491769.55 = 0.75 × t

Divide both side by 0.75

t = 42491769.55 / 0.75

t = 56655692.73 s

Divide by 86400 to express in days

t = 56655692.73 / 86400

t = 656 days

Thus, the time required is 656 days

Learn more about time:

https://brainly.com/question/24185898

#SPJ1

Given:

Sum of masses of two isotopes = 371.9087 u

Re-185 natural abudance = 37.40%

Re-187 natural abudance = 62.60%

Known:

atomic weight of Re = 186.207 u

Atomic mass of Re-185:

To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.

abundance of Re-185 = 37.40% = 0.3740

(371.9087 - x) = atomic weight of Re-187 in u

To find mass of Re-187:

abundance of Re-187 = 62.60% = 0.6260

Solution:

Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.

Re-185: (0.3740)(x) = 0.3740x

Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x

Step 2. Add the results and set them equal to 186.207.

0.3740x + 232.8148462 - 0.6260x = 186.207

Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.

0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -

232.8148462

0.3740x - 0.6260x = -46.6078462

-0.2520x = -46.6078462

-0.2520x/-0.2520x = -46.6078462/-0.2520

x = 184.9517706 u

Step 4. Atomic weights of Re-185 and Re-187.

x = 185.0 u = the atomic weight of Re-185

(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187

Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.

Answer:

The density is 2.5625g/mL. Hope this helped! :)

Explanation:

M= 8.2g                                                                               D=M/V

V= 28.3-25.1=3.2mL

D=8.2g/3.2mL

D= 2.5625g/mL

Saturated sodium chloride is used in this procedure because it helps to separate the organic layer from the aqueous layer.

What is organic layer?
Organic layer is a type of soil layer that includes organic matter such as leaves, wood, roots, and other plant and animal remains. This type of soil is important for agricultural production and is also beneficial to the environment. Organic layer is also known as top soil or humus. It is the most fertile and nutrient rich soil layer, due to the presence of the decomposing organic matter. Organic layer helps to regulate soil temperature and moisture, improve soil structure and aeration, and provide essential nutrients for plant growth. It also helps to reduce erosion, improve water-holding capacity, and keep soil particles in place. Organic layer also helps to increase the biodiversity of the soil, as it provides a habitat for beneficial microorganisms and other organisms. Organic layer is an important part of any healthy soil system.

The sodium chloride solution has a higher density than water and helps to ensure that the two layers remain distinct. Additionally, the sodium chloride helps to break the surface tension between the two layers, making it easier to separate them.

To learn more about organic layer
https://brainly.com/question/14356327
#SPJ4

Answer:

nonpolar

Explanation:

A nonpolar solvent has the highest solubility with a nonpolar solute.

Answer: contact metamorphism

Explanation:

Contact metamorphism happens when a body of magma intrudes into the upper part of the crust. Heat is important in contact metamorphism, but pressure is not a key factor, so contact metamorphism produces non-foliated metamorphic rocks such as hornfels, marble, and quartzite.

The enthalpy of the reaction is 14 J/mol.

The enthalpy of a reaction (ΔH) is the amount of energy transferred between a system and its surroundings during a chemical reaction at constant pressure, measured in joules per mole (J/mol). This value is important because it can tell us whether a reaction is exothermic or endothermic, as well as give us information about the strength of chemical bonds within the reactants and products.To calculate the enthalpy of a reaction, we need to know the amount of energy released or absorbed (Q) and the number of moles of the compound involved in the reaction (n). We can use the equation:
ΔH = Q/n
Given that 6 moles of a compound produce 84 J of energy, we can calculate the enthalpy of the reaction as follows:
ΔH = Q/n
ΔH = 84 J / 6 mol
ΔH = 14 J/mol
This means that for every mole of the compound involved in the reaction, 14 J of energy is transferred between the system and the surroundings. Since the value is positive, we can conclude that the reaction is endothermic, meaning that it requires an input of energy to occur.It is worth noting that the enthalpy of a reaction can depend on a number of factors, such as temperature, pressure, and the specific conditions under which the reaction occurs. As such, it is important to take these factors into account when calculating or predicting enthalpy values.

for such more questions on enthalpy

https://brainly.com/question/14047927

#SPJ8

Explanation:

employment in the country.

economic boom n latest techonology.

less poverty.

more development.

more jobs for people.

increase in exports which will make large profits n will be utilized in the development of country.

GDP per capita will increase.

high standard of living.

Answer:

94.2 g/mol

Explanation:

Ideal Gases Law can useful to solve this

P . V = n . R . T

We need to make some conversions

740 Torr . 1 atm/ 760 Torr = 0.974 atm

100°C + 273 = 373K

Let's replace the values

0.974 atm . 1 L = n . 0.082 L.atm/ mol.K . 373K

n will determine the number of moles

(0.974 atm . 1 L) / (0.082 L.atm/ mol.K . 373K)

n = 0.032 moles

This amount is the weigh for 3 g of gas. How many grams does 1 mol weighs?

Molecular weight → g/mol → 3 g/0.032 moles = 94.2 g/mol

Answer:

Group 18, noble gases

Explanation:

Noble gases have eight electrons in their outermost shell, except in the case of helium, which has two.

Answer:

halogens

Explanation:

The balanced equation for the reaction is N2(g) + O2(g) → 2NO(g).

The given value for the enthalpy change of the reaction is ΔH = 180.6 kJ. This value represents the heat released per mole of N2 reacted.

To determine the number of moles of NO produced, we need to calculate the moles of N2 reacted. Since the reaction is exothermic, the heat absorbed by the reaction is negative (-2976 kJ). However, it is not physically possible to have a negative number of moles. Therefore, we can conclude that no NO is produced in this case because the heat absorbed is insufficient to drive the reaction.

Using the equation ΔH = -2976 kJ/mol N2, we can set up a proportion:

180.6 kJ/1 mol N2 = -2976 kJ/x mol N2

Solving for x, we find:

x = (-2976 kJ * 1 mol N2) / (180.6 kJ) ≈ -16.46 mol N2

Since the reaction produces 2 moles of NO for every mole of N2, the number of moles of NO produced is twice the number of moles of N2:

Moles of NO = 2 * (-16.46 mol) ≈ -32.92 mol

The given reaction is N2(g) + O2(g) → 2NO(g), and the enthalpy change of the reaction is ΔH = 180.6 kJ. If the reaction absorbs 2976 kJ of heat, the number of moles of NO that can be produced can be calculated. By setting up a proportion, we find that approximately -16.46 moles of N2 are reacted. Since the reaction produces 2 moles of NO for every mole of N2, the calculated moles of NO would be approximately -32.92. However, negative moles are not physically possible, indicating that no NO can be produced in this case due to insufficient heat absorbed by the reaction.

To know mkre about mole, visit;

https://brainly.com/question/30892840

#SPJ11

When 2.5 mol of C reacts, the amount of energy released = 2.5 mol * 94 kcal/mol = 235 kcalb. When 3.0 mol of O2 reacts, the amount of energy released = 3.0 mol * 94 kcal/mol = 282 kcalc.

Correct answer is :a.

Calculate moles of C: Number of moles = mass of substance / molar mass of substance = 25g / 12.01 g/mol = 2.0829 molThe amount of energy released when 25.0 g of C reacts is 2.0829 mol * 94 kcal/mol = 195.76 kcal.

We can use the given equation to determine the amount of energy released during the combustion of coal with oxygen, as follows:C(s) + O2(g) → CO2(g) ΔH = -94 kcal/molFor (a):Amount of energy released when 2.5 mol of C reacts = 2.5 mol * 94 kcal/mol = 235 kcalFor (b):Amount of energy released when 3.0 mol of O2 reacts = 3.0 mol * 94 kcal/mol = 282 kcalFor (c):We can first calculate the number of moles of C:$$\text{Moles of C}=\frac{\text{Mass of C}}{\text{Molar mass of C}}=\frac{25.0\text{ g}}{12.01\text{ g/mol}}=2.0829\text{ mol}$$The amount of energy released when 25.0 g of C reacts is therefore:$$\text{Energy released}=2.0829\text{ mol}\times 94\text{ kcal/mol}=195.76\text{ kcal}$$.

To know more about reacts visit:
https://brainly.com/question/14168723

#SPJ11

The theoretical yield of a reaction is 5.00 moles of potassium permanganate . If the reaction actually produces 616.2 g KMnO₄ ,  the percent yield of the reaction is 78 %.

given that :

the theoretical yield of the reaction = 5 mol

mass of the potassium permanganate = 616.2 g

molar mass of the potassium permanganate = 158 g /mol

moles of the  KMnO₄ = mass / molar mass

                                   = 616.2 / 158

                                   = 3.9 moles

the percent yield = ( experimental yield / theoretical yield ) × 100 %

                              = ( 3.9 / 5 ) ×100 %

                              = 78 %

To learn more about percent yield here

https://brainly.com/question/14380568

#SPJ4

Answer: when gas is heated ,they gain more kinetic energy causing them to move faster.

Explanation: so as they gain kinetic energy they hit the walls of the container with more force thus causing pressure to increase

HOPE THIS HELPSS comment if u need more explanation

Answer:

4.031×\(10^{23}\)

Explanation:

You first need to calculate the number moles of NO2.  To do this use PV=nRT

STP stands for standard temperature and pressure which is 0 degrees C and 1 atm.

due to that:

P = 1 atm

V = 15 L

R = 0.08206 L*atm/mol*K

T = 273 K

n = unknown moles

solve for n to make the equation n=PV/RT

n=(1atm*15L)/(0.08206 Latm/molK*273K)

n=0.6696 mol of NO2

Then to find the number of molecules we use Avogadro's number which tells us the number of molecules per mol of a molecule or atom.

Avogadro's number is  6.02x10^23 molecules/mol

number of molecules = 0.6696mol × 6.02x10^23 molecules/mol

number of molecules = 4.031×10^23 molecules of NO2

Let me know if anything is not clear or if you get something else in the comments so that we can work it out.

I think it's A. air, because that's the one that will never have a confirmed shape because air can be trapped in jars, bags, closed spaces, and our body til we breathe it out.

Answer:

A because its A

Answer:

A is 5.67 x 10x10x10 B is 0.567 x 10x10x10x10

pH of the solution is 4.14.

m(CH₃COONa) = 5.54 g.

n(CH₃COONa) = m(CH₃COONa) ÷ M(CH₃COONa).

n(CH₃COONa) = 5.54 g ÷ 82.034 g/mol.

n(CH₃COONa) = 0.067 mol; amount of sodium acetate.

V(CH₃COONa) = 1.5 L

c(CH₃COONa) = n(CH₃COONa) ÷ V(CH₃COONa).

c(CH₃COONa) = 0.067 mol ÷ 1.5 L.

c(CH₃COONa) = 0.045 M; molarity of sodium acetate in solution.

c(CH₃COOH) = 18.5 M; molarity of pure acetic acid.

V(CH₃COOH) = 15.0 mL = 0.015 L; volume of acetic acid

n(CH₃COOH) = 18.5 M x 0.015 L = 0.2775 mol; amount of pure acetic acid

c(CH₃COOH) = 0.2775 mol / 1.5 L = 0.185 M; concentration of acetic acid in solution

Ka(CH₃COOH) = 1.8·10⁻⁵

pKa = -logKa = 4.75

Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).

pH = 4.75 + log(0.045M / 0.185M)

pH = 4.14; potential of hydrogen

More about sodium acetate: brainly.com/question/24671704

#SPJ4

The products of the reaction are Zinc chloride (ZnCl₂) and Hydrogen gas (H₂)

From the question,

We are to determine the product or products when zinc (Zn) reacts with hydrochloric acid (HCl)

To determine the product or products, we will write the chemical equation for the reaction.

The balanced chemical equation for the reaction is

Zn + 2HCl → ZnCl₂ + H₂

Hence, the products of the reaction are Zinc chloride (ZnCl₂) and Hydrogen gas (H₂)

Learn more here: https://brainly.com/question/17716543

Answer:

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding

Answer:

37.1 calories.

Approximately, 37.1 = 40 calories.

Explanation:

So, without mincing words let's dive straight into the solution to the question above.

We are given the following parameters which are going to help in solving this particular Question.

The mass of broccoli = 86g of broccoli, mass of carbohydrates present = 6g of carbohydrates, the mass of protein present = 2.6g of protein and the mass of fat present = 0.3g of fat.

Therefore, the nutritional energy content (in Calories) = (6 × 4) + (2.6 × 4) + (0.3 × 9) = 10.4 + 24 + 2.7 = 37.1

Hence, the nutritional energy content (in Calories) = 37.1 calories.

Approximately, 37.1 = 40 calories.

Salt in each of the following groups will the solubility depend on pH  is AgF, AgCl, and AgBr

Solubility depends on the pH of salts in the following groups: Group 1: The solubility of carbonates, hydroxides, and sulfates is a function of pH. Group 2: The solubility of sulfides, hydroxides, and sulfites is a function of pH.Group 3: The solubility of sulfides, carbonates, and hydroxides is a function of pH.Group 4: The solubility of sulfides, hydroxides, and sulfites is a function of pH.Group 5: The solubility of sulfides, hydroxides, and sulfites is a function of pH.Group 6: The solubility of sulfides, carbonates, and hydroxides is a function of pH.

A salt is formed from the reaction of an acid and a base. Salts can be made up of a variety of ions, which can affect their solubility in water. Salts containing anions that can act as weak bases are usually more soluble in acidic solutions than in basic solutions. Salts with anions that can act as strong bases are usually more soluble in basic solutions than in acidic solutions. AgF, AgCl, and AgBr are the salts in each of the groups mentioned above that will have solubility dependent on pH. They contain halide ions, which can act as weak bases. The solubility of these salts in water is thus determined by the pH of the solution.

Learn more about Solubility  at  brainly.com/question/29661360

#SPJ11