A 50. 0 gram substance absorbs 968 J of energy and increases in temperature from 30. 1°C to 40. 2°C. Calculate the specific heat

The mass (in grams) of water, H₂O that would theoretically be produced is 25.70 g

We'll begin by writing the balanced equation for the reaction of NH₄Cl to produce water. This given below:

NH₄Cl + NaOH -> NH₃ + NaCl + H₂O

From the balanced equation above,

53.5 g of NH₄Cl reacted to produce 18 g H₂O

Now, we shall determine the mass of water, H₂O produced from the reaction of 76.4 g of NH₄Cl. Details below:

From the balanced equation above,

53.5 g of NH₄Cl reacted to produce 18 g H₂O

Therefore,

76.4 g of NH₄Cl will react to produce = (76.4 × 18) / 53.5 = 25.70 g of H₂O

Thus, the mass of water, H₂O produced is 25.70 g

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When calcium reacts with water to form calcium hydroxide and hydrogen in the balanced equation for this reaction, then the coefficient of hydrogen will be 1.

Calcium is a chemical element having symbol Ca and its atomic number will be 20. As an alkaline earth metal, calcium is a very reactive metal that forms a dark oxide-nitride layer when it is exposed to air. Its physical as well as chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminum.

The balanced chemical equation for the reaction of calcium with water to form calcium hydroxide and hydrogen is:

Ca + 2H₂O → Ca(OH)₂ + H₂

In this equation, the coefficient of hydrogen (H₂) is 1.

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Final chloride ion concentration is 1.03 mol / Cl- L when 34. g of zncl2 have been dissolved in 696. ml of water.

First we need to convert  zncl2 to moles:

34 g zncl2 x 1 mole zncl2/ 136.3 g = 0.24 mol zncl2

Given the molecular formula, we have three chlorine atoms for every mole of zncl2

0.24 mol zncl2 x 3 mole Cl-/ 1 mole  zncl2 =  0.72 mol Cl-

Now we will divide this by the volume of the solution as liters

696 ml x 1 L/ 1000 mL =  0.696 L

Concentration =  0.72 mol Cl- / 0.696 L = 1.03 mol / Cl- L

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The Montreal Protocol, London Protocol, and Beijing Protocol are international agreements aimed at reducing stratospheric chlorine emissions and protecting the ozone layer. Among these protocols, the least aggressive in terms of decreasing stratospheric chlorine emissions is the Montreal Protocol.

The Montreal Protocol, adopted in 1987, is a global treaty that regulates the production and consumption of ozone-depleting substances (ODS). It has been successful in phasing out the production of major ODS such as chlorofluorocarbons (CFCs) and halons. By reducing the use of these substances, the Montreal Protocol has effectively decreased stratospheric chlorine emissions and helped in the recovery of the ozone layer.

The London Protocol, adopted in 1990, is an amendment to the original Montreal Protocol. It focuses on the elimination of chemicals known as ozone-depleting substances (ODS). Although it has contributed to the reduction of stratospheric chlorine emissions, the London Protocol is not as aggressive as the Montreal Protocol in terms of its targets and timelines for phase-out.

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Hot water stays on the top of cold water and doesn't mix. This is because of difference in DENSITY of water at different temperatures.

When we heat water, then the atoms gain energy from the heat and start moving away from each other. Now, when the atoms move away from each other than the (mass per unit volume) i.e. the density decreases. This makes water lighter.

When the temperature is less i.e. cold water then the atoms are more compactly packed and therefore the density of water is more at lower temperatures.

Since, hot water is lighter than cold water that is why it stays on top of the cold water.

The concentration of hydronium ions in the solution is approximately 1.41 × 10⁻⁶ M.

The concentration of ions in a solution depends on the specific ions present and their stoichiometry. In a salt solution, the concentration of ions can be determined based on the dissociation of the salt.

For example, if we have a salt NaCl, it dissociates in water to form Na+ and Cl- ions. The concentration of Na+ ions and Cl- ions would be equal and can be calculated based on the molar concentration of the salt solution.

If we have a 1 M NaCl solution, the concentration of Na+ ions and Cl- ions would also be 1 M.

In general, the concentration of ions in a solution can be determined by knowing the concentration of the compound that dissociates into those ions and considering the stoichiometry of the dissociation reaction.

The pH of a solution is a measure of the concentration of hydronium ions [\(\rm H_3O^+\)] . The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral, pH below 7 is acidic, and pH above 7 is basic.

To determine the concentration of hydronium ions in a solution from its pH, we can use the equation:

[\(\rm H_3O^+\)] = \(10^{(-pH)\)

Given that the pH of the salt solution is 5.89, we can calculate the concentration of hydronium ions:

[\(\rm H_3O^+\)] = \(10^{-5.89}\)

[\(\rm H_3O^+\)] ≈ 1.41 × 10⁻⁶

Therefore, the concentration of hydronium ions in the solution is approximately 1.41 × 10⁻⁶ M.

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The carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.

The term resonance structures are those structures that can be used to explain the bonding in a molecule. Sometimes, a single structure is insufficient in explaining the structure of a compound.

Now looking at the two sturctures, Z is better because there are mo formal charges which make the molecle less stable unlike in X. In the CO2 molecule, the carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.

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Answer:

a = 13 m/s²

Explanation:

Given data:

Mass of object = 200 Kg

Applied force = 2600 N

Acceleration  = ?

Solution:

Definition:

The acceleration is rate of change of velocity of an object with respect to time.

Formula:

a = Δv/Δt

a = acceleration

Δv = change in velocity

Δt = change in time

Units:

The unit of acceleration is m.s⁻².

Acceleration can also be determine through following formula,

F = m × a

a = F/m  (N = kgm/s²)

a = 2600 kgm/s² / 200 Kg

a = 13 m/s²

The precipitate is barium chromate.

The term precipitate refers to a solid that separates out in an aqueous phase reaction. In this case, we have two reactants in aqueous phase which is potassium dichromate and barium ions. We know that this reactions must produce a solid product. This solid product is what we call a precipitate.

The precipitate in this case is a pure white solid that is completely insoluble in water but could dissolve slightly in an acidic solution. We have to remember also that in this case, the barium ions could be sequestrated from the system by the addition of the dichromate solution.

Let us consider the reaction equation; \(K_{2} CrO_{4} (aq) + Ba^{2+} (aq) ----- > BaCrO_{4} (s)+ 2K^{+} (aq)\). From here it is obvious that a precipitate is formed and that is barium chromate.

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Answer:

opposites attract, the same repel each other

Explanation:

Answer:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.

Explanation:

Answer:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.

Explanation:

Answer:

Coductivity

Explanation:

Because heat conducts to them!

According to the illustration, the factors that influence the gravitational attraction between two objects would be mass and distance. Option A.

The gravitational attraction between two objects is determined by two factors: their masses and the distance between them.

This is due to the inverse square law, which states that the force between two objects is proportional to the inverse square of the distance between them.

Therefore, the correct answer is mass and distance.

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Answer:it is A

Explanation:

The correct answer to the addition of the given number will be D. 5,610.3 based on the rules for addition with significant figures.

We have to find the addition of:

35.7 + 432.33 + 5,142.312 = 5,610.342

However, according to the rule for significant figures, if the addend with the fewest decimal places is 1, the final consequent will also have one decimal place. If the lowest addend is 2, the final consequent will have two decimal places, and so on.

Because significant numbers are established in the form of digits, they are also known as significant digits. The number of significant digits can be determined by counting all of the values beginning with the first non-zero digit on the left. These numbers are dependable and required to represent the quantity of a length, volume, mass, measurement, and so on.

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Answer:

B. Digestive System

Explanation:

The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts. The first part is called the duodenum.

Answer:

B- Digestive

Explanation:

If you look at the diagram of the digestive system, you'll notice that the food is taken through the mouth which then goes through a pipe which is esophagus and enters the stomach. Which hence comes under the digestive system.

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Answer:

309.38 g

Explanation:

To determine the mass of calcium nitride that forms when 81.9 g of calcium and 40.0 g of nitrogen gas undergo a reaction with an 80.0% yield,  use the mass of the reactants and the chemical formula for calcium nitride to determine the theoretical yield of the reaction.

The first step

Determine the number of moles of calcium and nitrogen present in the reactants.  Do this by dividing the mass of each element by its atomic mass ( found on the periodic table).

calcium, the atomic mass is 40.08 g/mol, so the number of moles of calcium present is

81.9 g / 40.08 g/mol = 2.05 moles.

nitrogen, the atomic mass is 14.01 g/mol, so the number of moles of nitrogen present is

40.0 g / 14.01 g/mol = 2.86 moles.

The second step

use the chemical formula for calcium nitride (Ca3N2) to determine the mole ratio between the reactants and the product. In this case, for every 3 moles of calcium, 2 moles of nitrogen are needed to form calcium nitride.

Therefore

Use this mole ratio to determine the number of moles of calcium nitride that would be produced by the reaction if the yield were 100%. To do this, divide the number of moles of each reactant by the mole ratio to determine the number of moles of calcium nitride produced.

For calcium,

we have 2.05 moles / 3 moles/mol of Ca3N2 = 0.68 moles of Ca3N2.

For nitrogen,

we have 2.86 moles / 2 moles/mol of Ca3N2 = 1.43 moles of Ca3N2.

Since the yield of the reaction is 80%,  multiply the theoretical yield (which is the amount of calcium nitride that would be produced if the yield were 100%) by the yield to determine the actual amount of calcium nitride that is produced.

In this case, the theoretical yield of the reaction is 0.68 moles + 1.43 moles = 2.11 moles of Ca3N2.

The actual yield of the reaction is 2.11 moles * 80% = 1.69 moles of Ca3N2.

Finally,

convert the number of moles of calcium nitride to grams by multiplying the number of moles by the molar mass of calcium nitride (which is 183.02 g/mol).

The mass of calcium nitride produced is 1.69 moles * 183.02 g/mol = 309.38 g .

therefore, if 81.9 g of calcium and 40.0 g of nitrogen gas  react forming a reaction that has an 80.0% yield,  309.38 g of calcium nitride will form.#SPJ4

Answer:

true.

Explanation:

Answer:

Chemical because water + metal = rust.

Explanation:

A new substance was formed.

Meika's position is best defended by the experimental work will consist mostly of careful observation, recorded concisely and accurately. Thus, option b is correct.

Systematic error is an error that occurs because of a constant offset from the actual value due to a flaw in the procedure or equipment.

By carefully timing each part of the experiment, you eliminate the possibility of systematic errors due to variations in timekeeping.

Therefore, Maika's position would best be defended by the experimental work will consist mostly of careful observation, recorded concisely and accurately." Although this option is a good defense for the experiment, it directly addresses Meika's position.

This statement implies that the error associated with the experiment could be related to the way the observations were made, recorded, or interpreted, which suggests a possible systematic error.

Thus, option b is correct.

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Answer:

Cone Cell

Explanation:

There are about six to seven million cones in a human eye and are most concentrated towards the macula. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.

Answer:

Thus, the element containing the greatest number of atoms is 12 g He. Thus, the correct option is (4) 12 g He. Note: The number of atoms of a compound is Avogadro's number for 1 mole of compound. The number 6.022×1023 is known as Avogadro's number.

Explanation:

(4)✔️ 12 g He

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Answer:

120gram I think so this is the answer if the answer is correct plz mark me as brainliest.

Answer:

Explanation:

Density of a substance can be found by using the formula

\(Density(\rho) = \frac{mass}{volume} \)

From the question

Density = 2.5 g/mL

volume = 20 mL

To find the mass substitute the values into the above formula and solve for the mass

That's

Making mass the subject we have

mass = Density × volume

mass = 2.5 × 20

We have the final answer as

Hope this helps you

Answer:

mass=?,volume=20,density=2.5.

density=mass/volume.

which will be 2.5=mass/20

which is mass=2.5×20=50kg

Answer:

Explanation:

Although tRNAs participate in the essential function of protein translation in the cytoplasm, tRNA transcription and numerous processing steps occur in the nucleus.

Transfer RNA carries amino acids to the ribosome and adds them to the growing protein, copies the coded message from the DNA in the nucleus and carries the message to the ribosome in the cytoplasm.

Answer:

D is the answer because I think it is right plus I know they don't use two off them

Answer:Emerald is a gemstone that might be found in a necklace.

Explanation:Trust me i just got it right and i get all my other questions right.