why is soaking necessary for seed germination

Answer:

CaCO3 (calcium carbonate)

Explanation:

When adding water, CaCl2 (calcium chloride) is soluble, whereas calcium carbonate is not.

This means the calcium chloride will dissolve in the water but the calcium carbonate will not.

When it is filtered, the dissolved calcium chloride will pass straight through the filter paper with the water, whereas the calcium carbonate will be left as a residue as it is insoluble.

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Answer: 4

Explanation: because the zero doesn't count

The balanced chemical equation for the reaction between hydrobromic acid and sodium hydroxide is: The maximum mass of water that can be produced in this reaction is 0.495 g.

HBr + NaOH → NaBr + H2O

According to the equation, 1 mole of hydrobromic acid reacts with 1 mole of sodium hydroxide to produce 1 mole of water. The molar mass of HBr is 80 g/mol, while the molar mass of NaOH is 40 g/mol. Therefore, the number of moles of HBr and NaOH can be calculated as follows:

moles of HBr = 5.66 g / 80 g/mol = 0.07075 mol

moles of NaOH = 1.1 g / 40 g/mol = 0.0275 mol

Since the reaction between HBr and NaOH is a one-to-one ratio, the limiting reagent is NaOH because it produces fewer moles of product. Therefore, the number of moles of water produced can be calculated as follows:

moles of H2O = 0.0275 mol

The mass of water produced can be calculated using its molar mass, which is 18 g/mol:

mass of H2O = 0.0275 mol × 18 g/mol = 0.495 g

Therefore, the maximum mass of water that can be produced in this reaction is 0.495 g.

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Answer:

1.8 J/g·°C (2 sig.figs. per ΔT)

Explanation:

Given:

mass (m) = 78.9 grams

specific heat (c) = ?

Temp. Change (ΔT) = 109°C - 18°C = 91°C

Heat flow (q) = 13,240 Joules

q = m·c·ΔT => c = q/m·ΔT

∴c = 13,240J / 78.9g·91°C = 1.844 J/g·°C ≅ 1.8 J/g·°C (2 sig.figs. per ΔT)

Crystals form when magma cools because the solution is super-saturated with certain minerals. Because the crystals do not have much time to form if the magma cools quickly, they are very small. The crystals have enough time to grow and become large if the magma cools slowly.

When the solution becomes supersaturated, which means there is too much salt dissolved in the water, crystals form. Crystals form from the extra salt (or other material). To obtain a supersaturated solution, either cool the solution or allow some of the water to evaporate.

The size of the crystals is affected by the solubility of the compound in the solvent used for recrystallization, the number of nucleation sites, mechanical agitation of the system, and time during crystal growth.

Thus, the crystals do not have much time to form if the magma cools quickly, they are very small.

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Answer:

A

Explanation:

If Hydrogen is H₂  There will be two silver

and is Carbon is C There will only be one gray

and if Oxygen is O₃ There will be three red

Answer:

a liquid

Explanation:

Based on the mass of sodium carbonate reacting,

The equation of the reaction of sodium carbonate reacting with calcium hydroxide is given below:

Na₂CO₃ + Ca(OH)₂ ----> 2 NaOH + CaCO₃

Moles of sodium carbonate reacting = mass /molar mass

The molar mass of sodium carbonate = 106 g/mol

Moles of sodium carbonate reacting = 56/106

Moles of sodium carbonate reacting =0.528 moles

Moles of CaCO₃ produced = 0.528 moles

Mass of CaCO₃ produced = 0.528 * 100 g

Mass of CaCO₃ produced = 52.8 g

Moles of sodium hydroxide produced = 2 * 0.528

Mass of sodium hydroxide produced = 2 * 0.528 * 40 g

Mass of sodium hydroxide produced =42.24 g

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Answer:

2d

Explanation:

2d nije moguće. moguće je samo 3d do 7d. provjeri periodni sustav!

ako ne razumiješ, obrati mi pažnju

Answer:

1.B

2.A

3. B

Explanation:

1. A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing

2. so 2 is electrons of one atom are transferred permanently to another atom.meaning the answer is A

3. is When atoms combine by forming covalent bonds, the resulting collection of atoms is called a molecule. We can therefore say that a molecule is the simplest unit of a covalent compound.

A chemical bond is an attraction between two atoms.

A ionic bond is A bond formed when atoms transfer electrons.

The volume of the tank is approximately 130.75 m³.

To solve this problem, we need to use the concept of air and water vapor mixture. The given data includes the mass of dry air and water vapor, temperature, and total pressure. We can calculate the specific humidity, relative humidity, and volume of the tank using the following steps:

(a) Specific humidity:

The specific humidity (ω) is defined as the ratio of the mass of water vapor (m_w) to the total mass of the air-water vapor mixture (m_t):

ω = m_w / m_t

Given that the mass of water vapor is 0.17 kg and the total mass of the mixture is 15 kg + 0.17 kg = 15.17 kg, we can calculate the specific humidity:

ω = 0.17 kg / 15.17 kg ≈ 0.0112

So, the specific humidity is approximately 0.0112.

(b) Relative humidity:

Relative humidity (RH) is the ratio of the partial pressure of water vapor (P_w) to the saturation vapor pressure of water (P_ws) at the given temperature, multiplied by 100:

RH = (P_w / P_ws) * 100

To find the relative humidity, we need to determine the saturation vapor pressure at 30°C. Using a vapor pressure table or equation, we can find that the saturation vapor pressure at 30°C is approximately 4.246 kPa.

Given that the total pressure is 100 kPa, the partial pressure of water vapor is 0.17 kg / 15.17 kg * 100 kPa = 1.119 kPa.

Now we can calculate the relative humidity:

RH = (1.119 kPa / 4.246 kPa) * 100 ≈ 26.34%

So, the relative humidity is approximately 26.34%.

(c) Volume of the tank:

To find the volume of the tank, we can use the ideal gas law equation:

PV = nRT

Where P is the total pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to calculate the number of moles of dry air and water vapor in the tank. The number of moles (n) can be obtained using the equation:

n = m / M

Where m is the mass and M is the molar mass.

The molar mass of dry air is approximately 28.97 g/mol, and the molar mass of water vapor is approximately 18.015 g/mol.

For dry air:

n_air = 15 kg / 0.02897 kg/mol ≈ 517.82 mol

For water vapor:

n_water = 0.17 kg / 0.018015 kg/mol ≈ 9.43 mol

Now we can calculate the volume using the ideal gas law:

V = (n_air + n_water) * R * T / P

Given that R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin (30°C + 273.15 = 303.15 K), and P is the total pressure (100 kPa), we can calculate the volume:

V = (517.82 mol + 9.43 Mol) * 8.314 J/(mol·K) * 303.15 K / (100,000 Pa) ≈ 130.75 m³

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STEP-BY-STEP EXPLANATION

Sodium chloride (NaCl) exists in a solid state cause it possesses a high melting point. NaCl has a strong force attraction between sodium ion and chloride ion and this invole the transferring of electrons from sodium to chloride. Therefore, sodium chloride exists in the solid state.

Answer:

10 electrons

Explanation:

Answer:

\( \huge{\boxed{3.08 \: L}} \)

Explanation:

The volume of the heated balloon can be found by using the Charles' law formula which is;

\( \bold{\frac{V_1}{T_1} = \frac{V_2}{T_2}} \\ \)

where

T1 is the initial temperature

T2 is the final temperature

V1 is the initial volume

V2 is the final volume

From the question

T1 = 323K

T2 = 398K

V1 = 2.5 L V2 = ?

\( V_2 = \frac{V_1 \times T_2}{T_1} \\ \)

\( V_2 = \frac{2.5 \times 398}{323} = \frac{995}{323} \\ = 3.0804 \)

We have the final answer as

The sublimation is not percent yield of the filtrate does not similar to the calculated one for all these components. The detachment will not be complete if all the ammonium chloride is sublimed.

Sublimation is the type of physical change of solids to alter them directly to gaseous state. It needs much energy to direct the transition of solid to gas. Heating the solid substance at higher temperature will sublime the solid.

The mixture and sand, sodium chloride and ammonium chloride can be distinguished by heating the mixture to sublime the ammonium chloride. The leftover mixture of salt and sand is interacted in water. From which sand can be separated.

Thus,The incomplete separation of sand and NaCl. Percent yield of each will be reduced.

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Answer:

the mass is 24

Explanation:

The atomic number is defined as the totall number of electons in the atom in its non bonded state.

Thus the number of electron is 1w, atomic number is also 12.

Mass number is defined as the number of protons + neutrons in the nucleus of an atom.

Answer:

SATURATED: Saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds.

UNSATURATED: Unsaturated fats are loosely packed. They tend to be liquid at room temperature.

There are two main types of unsaturated fat:

Monounsaturated

Polyunsaturated

Metamorphic rock formation involves the transformation of existing rocks under heat and pressure. They form without melting and can appear foliated or non-foliated.

Metamorphic rocks are formed from the transformation of existing rock types in a process called metamorphism, which means 'change in form'. The appropriate phrases that describe metamorphic rock formation are: 'form from existing rocks', 'form without melting', 'appear foliated or non-foliated', and 'require heat and pressure to form'. These rocks are subject to conditions of heat and pressure that cause them to change physically and/or chemically, resulting in a new type of rock. They can either be foliated (layered) or non-foliated. Importantly, metamorphic rock formation does not include a liquid state, meaning they do not 'form from liquid rock' or 'form from deposition'.

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Answer:

It is balanced

Explanation:

There is 1 Carbon, 2 Hydrogen, and 1 Oxygen on the right and 1 Carbon, 1 Oxygen and 2 Hydrogen on the left. This equation is balanced.

Answer:

See Explanation

Explanation:

Given

(a) to (d)

Required

Determine whether the given parameters can calculate the required parameter

To calculate either Density, Mass or Volume, we have

\(Density = \frac{Mass}{Volume}\)

\(Mass = Density * Volume\)

\(Volume = \frac{Mass}{Density}\)

(a) 432 g of table salt occupies 20.0 cm^3 of space

Here, we have:

\(Mass = 432g\)

\(Volume = 20.0cm^3\)

The above can be used to calculate Density as follows;

\(Density = \frac{Mass}{Volume}\)

\(Density = \frac{432g}{20.0cm^3}\)

\(Density = 21.6g/cm^3\)

(b) 5.00 g of balsa wood, density of balsa wood : 0.16 g/cm^3

Here, we have:

\(Mass = 5.00g\)

\(Density = 0.16g/cm^3\)

This can be used to solve for Volume as follows:

\(Volume = \frac{Mass}{Density}\)

\(Volume = \frac{5.00g}{0.16g/cm^3}\)

\(Volume = 31.25cm^3\)

(c) 32 cm^3 sample of gold density of 19.3 g/cm^3

Here, we have:

\(Volume = 32cm^3\)

\(Density = 19.3g/cm^3\)

This can be used to calculate Mass as follows:

\(Mass = Density * Volume\)

\(Mass = 32cm^3 * 19.3g/cm^3\)

\(Mass = 617.6g\)

(d) 150 g of iron, density of Iron = 79.0 g/cm^3

Here, we have

\(Mass = 150g\)

\(Density = 79.0g/cm^3\)

This can be used to calculate volume as follows:

\(Volume = \frac{Mass}{Density}\)

\(Volume = \frac{150g}{79.0g/cm^3}\)

\(Volume = 1.90 cm^3\) Approximated

ionic  

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We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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Answer:

Answer choise D => Be - Cl

Explanation:

A quick way to define whether or not a bond is ionic or covalent is to look at the positions of the elements on the periodic table. The elements that have the greater positional distance between them will be the more ionic and the elements that are close together will be more covalent.

The positional distance between Be and Cl is greater than any of the other choses and therefore more ionic in nature.

Answer: kg= 0.37

Explanation:

Use the molality formula.

M= m/kg

James Ensor's Christ's Entry into Brussels (1889) was painted as a sarcastic response to Rodin's "Burghers of Calais." Therefore, the correct answer is Rodin's "Burghers of Calais."

"Burghers of Calais" is a sculpture by Auguste Rodin that depicts six burghers of Calais, a city in France, who offered their lives to save their fellow citizens during the Hundred Years' War.

The sculpture is a representation of heroism, sacrifice, and patriotism. James Ensor, however, was critical of this type of heroic representation and sought to challenge it through his own art.

In "Christ's Entry into Brussels," Ensor depicts a grotesque and chaotic scene of Christ's triumphant entry into the city. The painting is a satirical commentary on the hypocrisy of organized religion and the political corruption in Brussels at the time. It can be seen as a direct response to the heroism and idealism of Rodin's "Burghers of Calais."

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Because oil lacks a charge and is not drawn to the polar water molecules, it is a nonpolar material.

The more prevalent soluble contaminants are organic matter, sodium chloride, sodium sulphate, sodium carbonate, magnesium chloride, calcium chloride, calcium sulphate, and calcium bicarbonate. Sand, clay, and organic materials are some common examples of insoluble impurities.

Solids that may create a solution when combined with the appropriate liquid are said to be soluble (or soluable) solids. Because of this, the soluble substances in the liquid (such as water, oil, kerosene, etc.) dissolve. such as sugar and water or salt and water. Solids that do not dissolve in water are known as insoluble solids.

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Answer:

4.963x 10²

7.8761x 10³

8.9 x 10⁻²

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

for example the number 6324.4 in scientific notation will be written as = 6.3244 × 10³

a) 496.3 x 10²

4.963x 10²

b) 7876.1 x 10⁻⁷

7.8761x 10³

c) 0.089 x 10⁻⁹

8.9 x 10⁻²