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

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:

Coductivity

Explanation:

Because heat conducts to them!

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

please follow me.

Answer:

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

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

Learn more about mass produced:

https://brainly.com/question/9526265

#SPJ1

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.

223.13 grams of iron is required to react with 16.0 grams of sulfur.

Chemical equation: 8 Fe + Sg → 8 FeS

Molar mass of iron (Fe) = 55.85 g/mol

Molar mass of sulfur (Sg) = 32.07 g/mol

To determine the mass of iron required to react with 16.0 grams of sulfur, we follow these steps:

Step 1: Calculate the number of moles of sulfur (Sg):

Number of moles of Sg = Mass of Sg / Molar mass of Sg

Number of moles of Sg = 16.0 g / 32.07 g/mol

Number of moles of Sg = 0.499 moles

Step 2: Calculate the number of moles of iron (Fe) required to react with sulfur:

Number of moles of Fe = Number of moles of Sg × (8 moles of Fe / 1 mole of Sg)

Number of moles of Fe = 0.499 mol × (8 mol / 1 mol)

Number of moles of Fe = 3.99 moles

Step 3: Calculate the mass of iron needed:

Mass of iron = Number of moles of Fe × Molar mass of Fe

Mass of iron = 3.99 mol × 55.85 g/mol

Mass of iron = 223.13 g

Therefore, 223.13 grams of iron is required to react with 16.0 grams of sulfur.

Learn more about sulfur

https://brainly.com/question/1478186

#SPJ11

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.

Learn kire about hydridization of atoms: https://brainly.com/question/5637463

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

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

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.

More on gravitational attraction can be found here: https://brainly.com/question/29009418

#SPJ1

Answer:it is A

Explanation:

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.

To know more about chlorine emissions visit:-

https://brainly.com/question/31560014

#SPJ11

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.

hope it helps :))

Answer:

The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. For example, all the elements of group 1 i.e. alkali metals have a similar outer electronic configuration, ns1. Here n refers to the Principal Quantum Number of the outermost shell.

Explanation:

Answer:

Part A

pH ≈ 2.273

Part B

ΔpH ≈ -4.726

Part C

pH ≈ 1.973

Part D

ΔpH ≈ -0.301

Explanation:

Part A

The pH of a solution is given by the negative concentration of hydrogen ions in the solution

2.0 mL = 0.002 L

The number of moles of HCl in 2.0 mL of 4.0 M HCl is given as follows;

1 Liter of 4.0 M HCl contains 4.0 moles of HCl

2.0 mL = 0.002 L 4.0 M HCl contains 0.002 L/(1 L) × 4.0 M = 0.008 moles of HCl

The concentration of 0.008 moles in 1.50 L is given as follows;

Concentration = The number of moles/(The volume in liters)

∴ The concentration of 0.008 moles in 1.50 L, C = 0.008 moles/(1.5 L + 0.002 L)

∴ The concentration of 0.008 moles in 1.50 L, C ≈ 0.00533 moles/liter = 0.00533 M HCl

Given that HCl is a strong acid, we have that HCl dissociates completely to give equal number of H⁺ and Cl⁻ ions;

The number of moles of [H⁺] in the solution = 0.00533 moles

The pH of the solution = -log[H⁺]

∴ pH = -log[5.33 × 10⁻³] ≈ 2.273

The pH of the 1.5 L of pure water will be approximately 2.273

Part B

The pH of the pure water has changed from neutral (pH = 7) tp pH = 2.273

The change in pH is ΔpH = 2.274 - 7 = -4.726

ΔpH ≈ -4.726

Part C

When 2.0 mL of the 4.0 M HCl is added, the solution above, we have;

C = (0.008 + 0.008)/(1.5 + 0.002 + 0.002) ≈ 1.06383 × 10⁻²

The concentration of the solution becomes, C ≈ 1.06383 × 10⁻² mole/liter

The pH becomes, pH = -log(1.06383 × 10⁻²) ≈ 1.973

Part D

The amount by which the pH has changed, ΔpH ≈ 1.973 - 2.274 = -0.301.

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.

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:

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.

To know more about  calcium here

https://brainly.com/question/4023397

#SPJ4

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.

To know more about concentration of ions, refer here:

https://brainly.com/question/29737756

#SPJ4

Answer:

opposites attract, the same repel each other

Explanation:

Answer:

Kinetic energy to mechanical energy, and mechanical energy to electrical energy.

Explanation:

From the Law of conservation of Energy, which state that energy can neither be created nor destroyed but can be transformed from one form to another. Energy transformation is essential in science and technology, in the process of generating electricity from dams and nuclear power plants

some of the energy transformations are the same, the energy transformations occur in both dams and nuclear power plants is Kinetic energy to mechanical energy, and mechanical energy to electrical energy. Kinectic energy is the energy in motion which means the dams is a running water and posses a Kinectic energy then it's is been convert to mechanical energy (which is the macroscopic energy) then to electrical energy by producing light.

Answer:

Explanation:

Kinetic energy to mechanical and mechanical to electrical

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.