chemical element that has atomic number less than 58 and atomic mass greater than 135.6

26.62 grams of HBr would be present in 355 mL of a 7.5% m/v HBr solution.

Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.

There are various methods of expressing the concentration of a solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.

Given,

HBr = 7.5% m/ v

This means 7.5g of HBr in 100 ml of the solution.

1 ml of the solution has 0.075g

355 ml of the solution will have = 0.075 × 355 = 26.62g of HBr

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Rough ER is connected to the nuclear membrane and is responsible for the synthesis and processing of proteins.

The rough endoplasmic reticulum (ER) is a network of membrane-bound sacs and tubules that is studded with ribosomes on its surface. These ribosomes are responsible for protein synthesis. The rough ER is connected to the nuclear membrane because it receives instructions for protein synthesis from the DNA in the nucleus. This connection allows for the efficient transfer of genetic information from the nucleus to the rough ER.

Once the ribosomes on the rough ER synthesize proteins, the rough ER is also involved in the processing and modification of these proteins. It helps in folding the newly synthesized proteins into their functional three-dimensional shapes and also adds various modifications such as glycosylation (the addition of sugar molecules) or signal sequences that target the proteins to specific locations within or outside the cell.

After processing, the proteins may be transported to other parts of the cell or exported to the cell membrane or extracellular space. The connection between the rough ER and the nuclear membrane ensures a coordinated flow of genetic information and protein synthesis, allowing the cell to efficiently carry out its functions.

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Answer:

join the provisonal IRA and help free and unite ireland

Explanation:

fight aganst the english oppressors and free ireland

erinn go braugh

The final temperature of the 120 mL water, given that the water was initially at 18.44 °C is 21.19 °C

To obtain the final temperature of the water, we must obtain the equilibrium temperature of the stainless steel and water mixture. This is shown below::

Heat loss = Heat gain

MC(T - Tₑ) = MᵥᵥC(Tₑ - Tᵥᵥ)

Inputting the various parameters, we have:

30.14 × 0.474 (117.82 - Tₑ) = 120 × 4.184(Tₑ - 18.44)

14.28636(117.82 - Tₑ) = 502.08(Tₑ - 18.44)

Clear bracket

1683.219 - 14.28636Tₑ = 502.08Tₑ - 9258.3552

Collect like terms

1683.219 + 9258.3552 = 502.08Tₑ + 14.28636Tₑ

10941.5742 = 516.36636Tₑ

Divide both side by 516.36636

Tₑ = 10941.5742 / 516.36636

Tₑ = 21.19 °C

Thus, from the above calculation, the equilibrium temperature obtained is 21.19 °C.

Therefore, we can conclude that the final temperature of water is 21.19 °C

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Answer:

Sodium Sulfide

Explanation:

I looked it up

Answer:

cells are a basic unit of structure and function all things

Answer:

SO₂

Here you go :)

Have a wonderful day :D

You would need to take 5 mL of the 12 M acid and then make up to the 2000 mL mark.

The dilution formula is a mathematical expression used to calculate the new concentration of a solution . The dilution formula can be used to calculate the volume of a solution required in dilution. To use the formula, you must ensure that the units of concentration and volume are consistent

The final concentration of the solution is = Antilog (-1.5) = 0.03 M

Then;

12 * V = 2 * 0.03

Where V is the initial volume of the acid.

V = 0.005 L or 5 mL

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Answer:

I cant see it clearly

Explanation:

:(

Answer:

electron pair geometry - octahedral

molecular geometry - square pyramidal

bond angle - < 90 degrees

Explanation:

According to Valence Shell Electron Pair Repulsion Theory (VSEPR), The shapes of molecules depend on the number of electron pairs on the outermost shell of the central atom in the molecule. Recall that electron pairs are always positioned as far apart in space as possible to minimize repulsion.

For a molecule in sp3d2 hybridization, the expected electron domain geometry is octahedral. However, the presence of a lone pair in the molecule distorts the electron pair geometry away from the expected octahedral shape giving a molecular geometry of  square pyramidal and decreases the bond angle less than the expected 90 degrees.

The concentration in weight percent is 40%

The following data were obtained from the question:

Concentration in weight percent = (mass of sugar / total mass) × 100

Concentration in weight percent = (6.000 / 15.000) × 100

Concentration in weight percent = 0.4 × 100

Concentration in weight percent = 40%

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Answer: 3 qualitative: the word pharmacology is written in blue, the stairs are gray, the tile on the first floor is yellow. 3 quantitative: there are four people wearing yellow, there are Four pink boxes, there are two floors.

Inference: there are many people performing experiments so it’s a lab.

Explanation:

Answer:

Qualitive - The bars are yellow, The floor is green, and the floor has pharmacology on it.

Quantitative - There are 8 support bars, There is 3 gray coats, and there is 27 pills that I can see on that picture.

Inference - There are many people doing experiments because the word pharmacology is on the floor.

Explanation:

This picture tells you that pharmacology is a form of study of medicine and drugs.

Answer:

uhhh not really i don't even know what that is LOL

Answer:

I can say that knowledge of separating mixtures can help us in daily life and within society in the following ways:

1. Purification of water: Separation techniques are used to purify water for drinking and industrial purposes. It is essential to remove impurities from water to prevent diseases.

2. Recycling: Separation techniques are used to separate materials for recycling. This helps reduce the amount of waste in landfills and helps conserve resources.

3. Food industry: Separation techniques are used in the food industry to separate unwanted particles from food products. This helps ensure that the food we eat is safe and free from contaminants.

4. Medicine: Separation techniques are used in the pharmaceutical industry to separate and purify chemicals for use in medicine. This helps ensure that medicines are safe and effective.

5. Environmental protection: Separation techniques are used to remove pollutants from the environment. This helps protect our natural resources and prevent pollution-related health problems.

6. Oil and gas industry: Separation techniques are used to separate crude oil and natural gas into their various components. This helps in the production of energy and other useful products.

In summary, knowledge of separating mixtures is essential in our daily lives and within society. It helps ensure that we have access to safe and clean water, food, medicine, and energy, and also helps protect the environment.

Explanation:

The initial pressure exerted on the balloon was 8 atmospheres.

To find the initial pressure exerted on the balloon, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when temperature is constant. The formula for Boyle's Law is P1V1 = P2V2, where P1 and V1 represent the initial pressure and volume, and P2 and V2 represent the final pressure and volume.

In this case, we are given that the initial volume (V1) is 14 L and the final volume (V2) is double the initial volume (2 x V1). We are also given that the final pressure (P2) is 4 atmospheres. We need to find the initial pressure (P1).

Using the formula P1V1 = P2V2 and plugging in the given values, we have:

P1 * 14 = 4 * (2 * 14)

P1 * 14 = 4 * 28

P1 * 14 = 112

To isolate P1, we divide both sides of the equation by 14:

P1 = 112 / 14

P1 = 8

It's important to note that the unit of pressure in this case is atmospheres, as stated in the question. If the pressure unit had been different, appropriate unit conversions would have been necessary.

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Answer: 79420J or 79.420 Kj

Explanation:

q=mc(t2-t1)

250g x 4.18J/g K x (98C-22C)= 79420J

Answer: 1. Oxygen is the the limiting reactant.

2. 7.52%

Explanation:

The balanced chemical equation is:

\(2H_2(g)+O_2(g)\rightarrow 2H_2O(g)\)  

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} H_2=\frac{30.0g}{2g/mol}=15.0moles\)

\(\text{Moles of} O_2=\frac{5.29g}{32g/mol}=0.165moles\)

According to stoichiometry :

1 mole of \(O_2\) require  = 2 moles of \(H_2\)

Thus 0.165 moles of \(O_2\) will require=\(\frac{2}{1}\times 0.165=0.331moles\)  of \(NH_3\)

Thus \(O_2\) is the limiting reagent as it limits the formation of product and \(H_2\) is the excess reagent.

2.  \(\text{Moles of} H_2=\frac{9.93g}{2g/mol}=4.96moles\)

\(\text{Moles of} H_2O=\frac{6.72g}{18g/mol}=0.373moles\)

As 2 moles of \(H_2\) give = 2 moles of \(H_2O\)

Thus 4.96 moles of \(H_2\) give =\(\frac{2}{2}\times 4.96=4.96moles\)  of \(H_2O\)

percentage yield = \(\frac{\text {actual yield}}{\text {theoretical yield}}=\frac{0.373}{4.96}\times 100=7.52\%\)

Thus the percent yield for the reaction is 7.52%

Answer:

1.96 ×10²⁴ formula units AgNO3

Explanation:

3.25mol AgNO3 × (6.02 × 10²³ formula units) = 1.96 ×10²⁴ formula units AgNO3

There are 1.957 × 10²⁴ formula units of AgNO3 in 3.25 mol of AgNO3. Details about formula units is found below.

Formula units of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number. That is;

Formula units = 6.02 × 10²³ × no of moles

According to this question, there are 3.25mol of AgNO3. The formula unit of AgNO3 is calculated as follows:

Formula units = 3.25 × 6.02 × 10²³

Formula units = 19.57 × 10²³

Formula units = 1.957 × 10²⁴

Therefore, there are 1.957 × 10²⁴ formula units of AgNO3 in 3.25 mol of AgNO3.

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31). 1.088 L of oxygen gas will react with sodium to produce 3.87g of magnesium oxide.

32.) 4.93 grams of magnesium is produced when 3.96 grams of sodium reacts with magnesium chloride.

33). 9.52 grams of potassium chloride is produced when 4.7 L of chlorine reacts with 8.7g of potassium.

34). 90.35 grams of HCl is produced from the reaction of 47.3 L of chlorine with 2.50 g of hydrogen (H₂) as the limiting reactant.

31.) To determine the volume of oxygen gas (O₂) that will react with sodium to produce 3.87g of magnesium oxide (MgO), we first need to balance the chemical equation:

4Na + O₂ → 2Na₂O

From the balanced equation, we can see that the molar ratio between O₂ and MgO is 1:2. The molar mass of MgO is 40.31 g/mol. Using these values, we can calculate the number of moles of MgO produced:

moles of MgO = (3.87 g MgO) / (40.31 g/mol MgO) = 0.096 mol MgO

Since the molar ratio between O₂ and MgO is 1:2, we know that 0.096 mol of MgO requires 0.048 mol of O₂.

Now, we can use the ideal gas law to find the volume of O₂ at standard temperature and pressure (STP) conditions (0°C and 1 atm):

PV = nRT

V = (nRT) / P

= [(0.048 mol)(0.0821 L·atm/(mol·K))(273 K)] / (1 atm)

= 1.088 L

32). To determine the mass of magnesium (Mg) produced when 3.96 grams of sodium reacts with magnesium chloride (MgCl₂) to produce sodium chloride (NaCl), we need to balance the chemical equation:

2Na + MgCl₂ → Mg + 2NaCl

From the balanced equation, we can see that the molar ratio between sodium (Na) and magnesium (Mg) is 2:1. The molar mass of Mg is 24.31 g/mol. Using these values, we can calculate the number of moles of Mg:

moles of Mg = (3.96 g Na) / (22.99 g/mol Na) * (1 mol Mg / 2 mol Na) * (24.31 g/mol Mg)

= 4.93 g Mg

33). In the reaction where 4.7 L of chlorine (Cl₂) reacts with 8.7g of potassium (K), the balanced equation is:

2K + Cl₂ → 2KCl

From the balanced equation, we can see that the molar ratio between potassium (K) and potassium chloride (KCl) is 2:2 or 1:1. The molar mass of KCl is 74.55 g/mol. Using these values, we can calculate the number of moles of KCl produced:

moles of KCl = (8.7 g K) / (39.10 g/mol K) * (1 mol KCl / 2 mol K) * (74.55 g/mol KCl)

= 9.52 g KCl

34. To determine the limiting reactant and the mass of HCl produced, we need to compare the amount of HCl that can be formed from each reactant and identify the reactant that produces the lesser amount of HCl.

The balanced equation for the reaction is:

H₂ + Cl₂ → 2HCl

From the balanced equation, we can see that the molar ratio between H₂ and HCl is 1:2. This means that 1 mole of H₂ produces 2 moles of HCl.

First, let's calculate the number of moles of HCl that can be produced from 47.3 L of Cl₂ using the ideal gas law at STP conditions:

PV = nRT

n = (PV) / RT

= (1 atm)(47.3 L) / (0.0821 L·atm/(mol·K))(273 K)

= 2.10 mol Cl₂

Since the molar ratio between Cl₂ and HCl is 1:2, we know that 2.10 moles of Cl₂ can produce 2.10 * 2 = 4.20 moles of HCl.

Next, let's calculate the number of moles of HCl that can be produced from 2.50 g of H₂:

moles of H₂ = (2.50 g H₂) / (2.02 g/mol H₂)

= 1.24 mol H₂

Since the molar ratio between H₂ and HCl is 1:2, we know that 1.24 moles of H₂ can produce 1.24 * 2 = 2.48 moles of HCl.

Mass of HCl produced from 2.50 g of H₂:

mass of HCl = (2.48 mol HCl) * (36.46 g/mol HCl)

= 90.35 g HCl

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Answer:

K2CO3 is the salt

Explanation:

K2CO3 is the salt

since, H2O is a liquid

so, it's lefting K2CO3 a salt.

A container with a volume of nitrogen gas is filled to 1.50 atm of pressure and 23°C of temperature. Compute the amount of gas in moles led with as at 2.91 moles is 18.87 liters.

The three gas laws that make up the combined gas law, also known as a general gas equation, are Charle's law, Boyle's law, and Gay-Lussac law. The law shows the link between temperature, volume, and pressure for a given amount of gas.

PR/T=V

V= 2.91×150/23

V=18.87liters

According to Boyle's Law, gas volume increases as pressure lowers. Charles' Law states that a gas expands as its temperature rises. Also, according to Avogadro's Law, a gas's volume increases as its concentration does.

Either the total amount of gaseous substance or the number of gas moles.

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According to the question the reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.

Enthalpy is a thermodynamic property of a system that measures the total energy content of a system. It is a state function that is expressed in terms of internal energy, pressure, and volume of a system. Enthalpy represents the amount of energy that is associated with a chemical reaction or physical change.

The reaction is exothermic, meaning that heat is released during the reaction. The amount of heat released can be calculated with the equation q = mcΔT, where q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature of the solution. Using the given data, the amount of heat released by the reaction can be calculated as q = (250 g)(4.184 J/g-K)(11.1 K) = 10610 J. The enthalpy change for the reaction can then be calculated by dividing the heat released by the number of moles of NaOH, which is 11.1 g / 40.00 g/mol = 0.278 moles. The reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.

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Best example of a new substance being formed is the reaction between hydrogen gas and oxygen gas to form water.

In this reaction, two hydrogen molecules (H₂) react with one oxygen molecule (O₂) to form two water molecules (H₂O). The resulting substance, water, has entirely different properties from its constituent elements. For example, water is a liquid at room temperature, while both hydrogen and oxygen are gases.

Water also has different chemical and physical properties, such as boiling point, melting point, density, and solubility. These changes in properties indicate that a new substance with a different chemical composition has been formed. The process of hydrogen and oxygen reacting to form water is an example of a chemical reaction, which involves the breaking and forming of chemical bonds between atoms to create new substances.

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The highlighted apparatus are;

1) stirring rod

2) crucible

The term chemical reaction refers to the process by which two or more substances are combined to form a product. The product may look like or different from the reactants that were combined to produce it.

Now we can see the set up that was used as shown for the reaction of  dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate.

The highlighted apparatus are;

1) stirring rod

2) crucible

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Answer:

There are 3.011 × 10^23 oxygen atoms

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Answer:

b is the answer.

Explanation:

Answer:

moles of water in 1 ml = 1/18 mol.

take 1 ml and calculate it by 30

1 ml x 30= 30 ml

Explanation:

The molarity of the solution is 1.112 M. To calculate the molarity of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters).

The number of moles per litre of solution is how it is defined. It is employed to calculate the gramme equivalent in respect to the entire solution volume. It is employed for calculating the mole ratio in the solution's overall volume. Normality is measured in N or eq L-1 units.

First, you need to convert the given mass of NaCl into moles. The molar mass of NaCl is 58.44 g/mol.

Number of moles of NaCl = 65 g / 58.44 g/mol = 1.112 mol

Now, you can calculate the molarity of the solution using the formula:

Molarity = Number of moles of solute / Volume of solution in liters

Molarity = 1.112 mol / 1 L

Molarity = 1.112 M

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The pH of the solutions are as follows:

a. pH = 4.4

b. pH = 0.2

The pH of a solution is a measure of the acidity or basicity of a solution.

The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

pH = -log [H⁺]

where [H⁺] is the hydrogen ion concentration

The pH of the solutions are as follows:

a.  150.0 ml of a 3.5 x 10⁻⁵ M HNO3.

pH = -log (3.5 x 10⁻⁵)

pH = 4.4

b. 250.0 ml of a 0.63 M solution of HNO2

pH = -log (0.63)

pH = 0.2

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