5.00×10−3 mol of hbr are dissolved in water to make 12.0 l of solution. what is the concentration of hydroxide ions, [oh−] , in this solution?

Answer:

The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.

Explanation:

In an endothermic reaction,the energy found in the reactants remains in the system, and the reactants also take energy from the surroundings. The enthalpy change of an endothermic reaction is positive.

The reaction in which  heat energy is absorbed by the reactants is called an endothermic reaction. The enthalpy change in an endothermic reaction is positive.

The reaction in which heat is evolved from the system to the  surroundings is called an exothermic reaction in which the enthalpy change is negative.

By absorbing heat energy, reactants becomes energetic enough to overcome the barrier potential of the reaction. Therefore, the potential energy diagram of an endothermic reaction will show less energy for reactants than that of products.

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The mass of anhydrous magnesium sulfate that will remain is 11.7 g.

When a hydrated salt such as MgSO₄⋅7H₂O is heated thoroughly so it becomes anhydrous, all the moles of water of crystallization are driven off.

The mass of anhydrous magnesium sulfate will remain if 24.0 g of MgSO₄⋅7H₂O is thoroughly heated is calculated as follows:

Molar mass of MgSO₄⋅7H₂O = 24 + 32 + 16 * 4 + 7 * 18

Molar mass of MgSO₄⋅7H₂O = 246 g/mol

Percentage mass of anhydrous magnesium sulfate will be:

mass of MgSO₄ = 24 + 32 + 16 * 4

mass of MgSO₄ = 120 g

Percentage mass of anhydrous magnesium sulfate = 120/246 * 100%

Mass of anhydrous magnesium sulfate that will remain = 120/246 * 100 * 24

Mass of anhydrous magnesium sulfate that will remain = 11.7 g

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Answer:

To summarise, a parent cell divides by mitosis (doubling the DNA then splitting) and then divides again to have 4 daughter cells with all different DNA in and all with only half the amount of DNA as a normal body cell. This stage is meiosis. They make sperams and eggs which fuse together in fertilisation and once fertilised the cell will divide by mitosis to create embryos and further to grow into a fetus.

Free fatty acids do not typically form bilayers because they possess a single long hydrocarbon chain with a carboxylic acid group (-COOH) at one end. The carboxylic acid group is polar and hydrophilic (water-loving), while the hydrocarbon chain is nonpolar and hydrophobic (water-repellent).

Carboxylic acids are a class of organic compounds that consist of a carboxyl group (-COOH) attached to a hydrocarbon chain. They are considered one of the most important and versatile functional groups in organic chemistry. The carboxyl group is composed of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom.

Carboxylic acids are typically acidic due to the presence of the carboxyl group, which can donate a proton (H+) to a base. They exhibit several characteristic chemical properties, including the ability to form salts, esters, amides, and anhydrides. The length and structure of the hydrocarbon chain attached to the carboxyl group can vary, resulting in a wide range of carboxylic acids with different physical and chemical properties.

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Answer:

large, released

Explanation:

As we know, fireworks contain l o t s of energy, even before the burst of colors release. So i think choice 3 is the answer.

i hope this helps :)

Answer:

Colloids are defined as a mixture where particles are dispersed in another substance.

Explanation:

eg.) dust in the air, milk, smoke, hairspray

Answer:

(2) Ammonia I hope you good luck

(1) aluminum

Let's look at all the options first:

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According to ideal gas equation, 0.5186 moles of gas are required to occupy 210 L at a pressure of 5.4 atmospheres and a temperature of 263 K.

The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

Substituting the given values in the given equation, n= 5.4×210/8.314×263=0.5186 moles

Thus there are 0.5186 moles occupying  210 L at a pressure of 5.4 atmospheres and a temperature of 263 K.

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The term mole concept is used here to determine the number of grams of sucrose. The mole concept is a convenient method to express the amount of the substance. The grams of sucrose is  1509.5 g.

One mole of a substance is that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon 12. The equation used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

1. Mass = 4.41 × 342.3 = 1509.5 g

2. Moles = 350 / 105.98 = 3.302

3. Mass = 7.38 × 36.45 = 269.001 g

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Answer:Releasing insulin to decrease blood sugar and releasing glucagon to increase blood sugar

Explanation: homoestasis is the process by which the body keep it's internal environment constant, regardless of change in the external environment. The human body has a normal range in which it's system operates and it uses homoestasis to keep these at constant.

Homeostasis could be positive or negative. It usually involves a sensor which detects the changes in the body and passes the information to the control center, a control center which receive information from the sensor and sends signals to the effectors and the effector which acts on the information sent by the control center to effect normalcy.

In this case, when a person eats food,he gets glucose. Blood sugar most be kept at constant so the endocrine system release the hormone insulin. Insulin helps to convert glucose to glycogen, which is the form it can be stored in the liver

When the blood sugar levels is low, the brain which is the control center causes glucagon to be released . This hormone converts glycogen to glucose

Answer:

Answer:Releasing insulin to decrease blood sugar and releasing glucagon to increase blood sugar

Explanation:

Answer:

A. Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. ... Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.

B. The explanation becomes a scientific theory. In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time.

The volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

The volume of a gas can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

0.0345 × V = 0.55 × 0.0821 × 295

0.0345V = 13.32

V = 386L

Therefore, the volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

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Answer:

The answer is 34.2 L.

Explanation:

Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)

Plug in the known values into the Ideal Gas Law equation:

3.5 kPa * V = 0.55 moles * 8.31 J/mol*K * 295 K

Finally, solve for V:

V = (0.55 moles * 8.31 J/mol*K * 295 K) / 3.5 kPa

= 34.2 L

The two main methods used to increase CO2 levels in beer after fermentation are natural carbonation and forced carbonation.

Natural carbonation involves adding a small amount of sugar to the beer before bottling or kegging. The residual yeast in the beer will consume the sugar, producing CO2 as a byproduct, which will dissolve into the beer, naturally carbonating it. This process can take anywhere from a few days to a few weeks, depending on the beer style and temperature.

Forced carbonation, on the other hand, involves using a CO2 tank to directly inject carbon dioxide into the beer. The beer is placed in a closed vessel and pressurized with CO2 until the desired level of carbonation is reached. This method is much quicker and more precise than natural carbonation, but it requires specialized equipment and can be more expensive.

Both methods have their advantages and disadvantages, and many breweries use a combination of both to achieve the desired level of carbonation for their beers. The level of carbonation can greatly affect the taste and mouthfeel of the beer, so it is an important consideration for brewers to get right.

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Explanation:

According to Charles law : V/T=k (constant).

the volume temperature relationship will be

V/T = 117.5/25 = 4.7

hope this helps you.

Answer:

4Fe + 3O₂ → 2Fe₂O₃

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define

RxN:   Fe + O₂ → Fe₂O₃

Step 2: Balance

We need to balance both Fe and O.

LCM of 2 and 3 is 6:

Fe + 3O₂ → 2Fe₂O₃

We now need the same amount of Fe on both sides:

4Fe + 3O₂ → 2Fe₂O₃

Answer:

Explanation:

Number of Nitrogen atoms : 1 atom

Number of Hydrogen atoms : 1(4) + 1 = 4 + 1 = 5 atoms

Number of Oxygen atoms : 1 atom

Total atoms

Calculate atoms of each element

Total atoms

The whole number that comes before a compound is called a coefficient and it is used to balance the compound in a chemical equation.

Chemical compounds is defined as those substances which are made up of two or more elements that are chemically combined together.

The combination of two compounds that reacts are called the reactants while the compounds that are formed are called the products.

The reaction that leads to the formation of products needs to be balanced using whole numbers in front of the chemical compounds.

For example,

\(H_{2}\) +\(O_{2}\) --->\(H_{2} O\)

To balance the above equation, the whole number 2 is inserted infront of  hydrogen and the water molecule that is formed. That is,

\(2H_{2} +O_{2} --- > 2H_{2} O\)

Therefore, the whole number that comes before a compound is called a coefficient and it is used to balance the compound in a chemical equation.

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Answer:

Each column is called a group.

The elements in each group have the same number of electrons in the outer orbital

Explanation:

Answer: All of the elements in the same collumn (group) have the same amount of valence electrons.

The molarity of the glucose solution is 8.30 mol/L.

To solve this problem, we need to use the freezing point depression equation:

ΔT = Kf * m

Where ΔT is the change in freezing point, Kf is the freezing point depression constant for the solvent (in this case, water), and m is the molality of the solute (in this case, glucose).

We know that the freezing point depression is 0 - (-10.3) = 10.3°C. The freezing point depression constant for water is 1.86 °C/m, so we can plug in these values to solve for the molality:

10.3°C = 1.86°C/m * m

m = 5.53 mol/kg

Now we need to convert molality to molarity. We know that the density of the solution is 1.50 g/ml, which means that 1 L of solution has a mass of 1500 g. Since the molar mass of glucose is 180.16 g/mol, we can calculate the number of moles of glucose in 1 L of solution:

5.53 mol/kg * 1.50 kg/L = 8.30 mol/L

Therefore, the molarity of the glucose solution is 8.30 M.

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Answer:

Flatworms (Platyhelminthes) are acoelomates i.e. they lack a coelom. Molluscs and insects (Arthropoda) are coelomates as they have a true coelom derived from the germ layer mesoderm. Roundworms (Aschelminthes) are pseudocoelomates as the coelom is not derived from the mesoderm.

Earthworm is an invertebrate belongs to phylum Annelid. so it does not belongs to phylum aschelminthes​.

Phylum Aschelminthes is called as roundworms, their bodies appear circular,  approximately 15000 different types of roundworms are present.

These are pseudocoelomate, bilaterally symmetrical, triploblastic,  vermiform organisms having complete digestive system, commonly seen in soil, feed on bacteria.

These are also found in the human intestine, cause a disease called ascariasis, do not have a respiratory or circulatory system.

Some of the unique features are presence of Syncytial epidermis, Muscle layer of body wall, Pseudonym, complete digestive tract, unisexual in nature.

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The inhibition of DHFR will have an immediate impact on the production of deoxythymidine monophosphate (dTMP) (dihydrofolate reductase).

Dihydrofolate reductase (DHFR) is an enzyme that catalyses the transformation of dihydrofolate (DHF) to tetrahydrofolate (THF), a vital co-factor necessary for the manufacture of purines and thymidine, which are fundamental components for DNA synthesis. The inhibition of DHFR will have a direct impact on the production of deoxythymidine monophosphate (dTMP), the precursor of the thymine nucleotide in DNA. This is because DHFR is a crucial enzyme in the thymidine synthesis pathway since it converts DHF to THF, which is required for the formation of dTMP through a series of enzymatic processes.

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Answer:

80. Sorry if I am wrong.

Explanation:

Explanation:

, Calculate Frequency

Example #11: What is the frequency of radiation with a wavelength of 5.00 x 10¯8 m? In what region of the electromagnetic spectrum is this radiation?

Solution:

1) Use λν = c to determine the frequency:

(5.00 x 10¯8 m) (x) = 3.00 x 108 m/s

x = 6.00 x 1015 s¯1

2) Determine the electromagnetic spectrum region:

Consult a convenient reference source.

This frequency is right in the middle of the ultraviolet region of the spectrum.

Problem #12: What is the wavelength of sound waves having a frequency of 256.0 sec¯1 at 20 °C? Speed of sound = 340.0 m/s. (The problem is about sound, but this does not change the basic idea of the equation "wavelength times frequency = speed."

Solution:

a) Use λν = speed:

(x) (256.0 s¯1) = 340.0 m/s

The answer, to four sig figs, is 1.328 m.

Just for kicks: in centimeters, 132.8 cm, and in Ångströms, 1.328 x 1010 Å

Probs 13, 14, 15 here soon

Given Frequency, Calculate Wavelength

Problem #16: Calculate the wavelength of radiation emitted from radioactive cobalt with a frequency of 2.80 x 1020 s¯1. What region of the eletromagnetic spectrum does this lie in?

Solution:

1) Calculate the wavelength:

λν = c

(x) (2.80 x 1020 s¯1) = 3.00 x 108 m/s

x = 1.07 x 10¯12 m

2) Determine the region of the EM spectrum:

Consult a convenient reference source.

Gamma rays.

Problem #17: 1.50 x 1013 Hz? Does this radiation have a longer or shorter wavelength than red light?

Comment: there are a number of ways to answer this question. I'll do two.

Solution #1:

Calculate the frequency of 7000 Å (the longest wavelength of red light):

7000 Å = 7000 x 10¯8 cm = 7.00 x 10¯5 cm (three sig figs is a reasonable assumption)

λν = c

(7.00 x 10¯5 cm) (x) = 3.00 x 1010 cm/s

x = 4.28 x 10¯14 s¯1

A lower frequency (like the value given in the problem) means a longer wavelength. The radiation in the problem has a longer wavelength than the red light I used.

Beyond red on the EM spectrum is infrared.

Solution #2:

Consult a convenient reference source.

Compare 1.50 x 1013 Hz to the various values in the frequency column of the above web site.

Determine that the frequency given in the problem lies in the infrared, a region that has a longer wavelength than red light does.

Problem #18: What color is light whose frequency is 7.39 x 1014 Hertz?

Solution:

The usual manner to solve this problem is to determine the wavelength, then compare the wavelength to a color chart of the electromagnetic spectrum. Here is an example of a color chart. You can find many more on the Internet.

1) Determine wavelength:

λν = c

(x) (7.39 x 1014 s¯1) = 3.00 x 108 m/s

x = 4.065 x 10¯7 m

2) EM color charts usually express the wavelength in nm:

4.065 x 10¯7 m times (109 nm / 1 m)= 406.5 nm

3) When you examine a color chart, you see that the given wavelength is in the violet region.

An alternate method would be to find a color chart which associates frequency values with the colors of the visible spectrum. This type of chart is not as common as a wavelength-based chart, but they can be found. Here is an example.

Using that chart will require that you convert Hz to THz (terahertz).

7.39 x 1014 Hz times ( 1 THz / 1012 Hz) = 739 THz

Problem #19: Calculate the frequency of radiation with a wavelength of 4.92 cm.

Comment: since the wavelength is already in cm, we can use c = 3.00 x 1010 cm s¯1 and not have to do any conversions at all.

Solution:

(4.92 cm) (x) = 3.00 x 1010 cm s¯1

x = 6.10 x 109 s¯1

Problem #20: Calculate the frequency of radiation with a wavelength of 8973 Å.

Comment: since 1 Å = 10¯8 cm, therefore 8973 Å = 8973 x 10¯8 cm. Converting to scientific notation gives 8.973 x 10¯5 cm. This is another place where the cm s¯1 value for c can be used, since Å converts to cm very easily.

Solution:

(8.973 x 10¯5 cm) (x) = 3.00 x 1010 cm s¯1

x = 3.34 x 1014 s¯1

The frequency of the radiation is 6.0 × 10¹⁵ s⁻¹

The radiation is in the Ultra-violet region of the electromagnetic spectrum

From the question,

We are to determine the frequency of radiation with a wavelength of 5.00 × 10⁻⁸ m

From the formula

\(c = \nu \lambda\)

We can write that

\(\nu = \frac{c}{\lambda}\)

Where \(\nu\) is the frequency

\(c\) is the speed of light (\(c = 3.0 \times 10^{8} \ m/s\))

and \(\lambda\) is wavelength

From the given information

\(\lambda = 5.00 \times 10^{-8} \ m\)

∴ \(\nu = \frac{3.0 \times 10^{8} }{5.00 \times 10^{-8} }\)

\(\nu = 6.0 \times 10^{15} \ s^{-1}\)

Hence, the frequency of the radiation is 6.0 × 10¹⁵ s⁻¹

The radiation is in the Ultra-violet region of the electromagnetic spectrum

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Answer:

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.

a-  With ions shown as spheres and solvent molecules omitted for clarity, AgCLof the following best represents the resulting mixture.b- If each sphere represents 5.5*10^-3 mol of ions,  the total concentration of dissolved (separated) ions 0.11 M (molar) and total mass of solid is 32,.61.

a) The resulting mixture of AgCl, CuCl2, and MgCl2 would be a homogeneous solution. All three of these compounds are ionic compounds and when dissolved in water, they will dissociate into their respective cations (Ag+, Cu2+, and Mg2+) and anions (Cl-). These ions will be surrounded by solvent molecules (water) and will be evenly distributed throughout the solution, resulting in a homogeneous mixture.

b) The total concentration of dissolved ions in the solution can be calculated by using the formula:concentration (mol/L) = moles of solute / liters of solvent. If each sphere represents 5.5*10^-3 mol of ions, and the final volume of the solution is 50.0 mL, we can convert the volume to liters and calculate the concentration of ions as follows: 50.0 mL = 0.05 L. Concentration = (5.5*10^-3 mol) / 0.05 L = 0.11 M (molar)

c) To find the total mass of the solid, we need to know the molar mass of each component. AgCl: Ag = 107.87g/mol, Cl = 35.45g/mol, AgCl = 143.32g/mol

CuCl2: Cu = 63.55g/mol, Cl = 35.45g/mol, CuCl2 = 99.00g/mol

MgCl2: Mg = 24.30g/mol, Cl = 35.45g/mol, MgCl2 = 59.75g/mol. Let's assume we have 0.1 mol of AgCl, 0.1 mol of CuCl2 and 0.1 mol of MgCl2, the total mass of the solid would be:

143.32g/mol * 0.1mol + 99.00g/mol * 0.1mol + 59.75g/mol * 0.1mol = 16.73 + 9.90 + 5.98 = 32.61g

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Explanation:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

The density of copper having a molar volume of 7.09 cm³/mol at 25℃ is 8.96 g·cm⁻³.

The density of copper is the ratio of its mass to volume. That is, we need to calculate the mass of 1 cm³ of copper, which is equal to the density of copper. We can use the molar mass of copper to find out the mass of 1 mole of copper.

Molar mass of copper (Cu) = 63.5 g·mol⁻¹

We know that 1 mole of copper has a volume of 7.09 cm³. We can use this information to find the mass of 1 cm³ of copper.

Mass of 1 cm³ of copper = Mass of 1 mole of copper ÷ Volume of 1 mole of copper = 63.5 g ÷ 7.09 cm³ = 8.96 g/cm³

Therefore, the density of copper at 25℃ is 8.96 g·cm⁻³.

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Answer:

10. Embryology is the branch of biology and medicine concerned with the study of embryos and their development.

11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).

12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).

13.  Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.

14. Two ways we know that Maiacetus was a whale re:

1) Their skeletons have all been found among fossils of sea-creatures which suggests they lived in the sea.

2) Their hip bones were strong enough to walk on land, but their short legs combined with long flat fingers and toes suggest they would have had difficulty walking.

15. The name Maiacetus means Mother Whale. Maiacetus is significant because of how well the skeletons were preserved.

Hope this helps! :D

Answer:

NITRATE ION

Explanation: