CHEMISTRY HIGH SCHOOL

What did alchemists contribute to the development of chemistry?

Answers

Answer 1
Answer: The alchemists were the first chemists, but they were also mixing chemicals, they believed that magic would help with their experiments.but it didn't. but their experiments of the science of chemistry did.
Answer 2
Answer:

Final answer:

Alchemy made contributions to the development of chemistry through advancements in manipulating matter, discovering the law of conservation of matter, and contributing to the understanding of atoms and the periodic table.

Explanation:

Alchemy made some contributions to the development of chemistry. Although it was not scientific by modern standards, alchemists made progress in manipulating matter and exploring the properties of substances. One example of an alchemist's contribution is the discovery of the law of conservation of matter by Antoine Lavoisier, often regarded as the father of modern chemistry. Lavoisier's work with gases also changed chemistry from a qualitative to a quantitative science and laid the groundwork for further study. Additionally, alchemists played a role in developing the concept of atoms and the periodic table, which are fundamental in chemistry.

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A gas has experienced a small increase in volume but has maintained the same pressure and number of moles. According to the ideal gas law, how has the temperature of the gas changed?

Answers

temperature has increased

Ideal Gas Law:

pressure * volume = (number of moles of gas) * (0.08206) * (temperature)

or short-hand:
PV = nRT

this equation can be transformed to solve for temperature as:
T = PV / nR

given there is no change in pressure and the volume of the container has increased, we know the temperature increases because volume is in the numerator--a larger number on top reflects an overall greater number.

B) It has increased slightly

Which of the following shows the correct setup in converting 234 kilopascals to torr?

Answers

1 Pascal is equal to 0.008 Torr. So if you have 234 kilopascals, then

234 kilopascals ( 1000 Pascals/ 1 kilopascals) (0.008 Torr / 1 Pascal) = 1,872 Torr

1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus, a. the strong nuclear force is much greater than the electric force.
b. the electric force is much greater than the strong nuclear force.
c. the strong nuclear force equals the electric force.
d. the strong nuclear force and the electric force are both attractive.
9. Uranium-238 undergoes alpha decay. Therefore, uranium-238 will
a. remain stable.
b. change into a different element altogether.
c. emit neutral particles and no energy.
d. none of the above

Answers

1. Answer;

a. the strong nuclear force is much greater than the electric force.

Explanation;

  • For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently.
  • Therefore, an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.
  • Small atoms are stable; this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together.

9. Answer;

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will  change into a different element altogether.

Explanation;

  • Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
  • Uranium-238 is an example of such atom, which may undergo decay to achieve stability.
  • Alpha decay is one of the types of decays, others being beta decay and gamma decay. In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.
  • Therefore, Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234.
1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus,

a. the strong nuclear force is much greater than the electric force.


9. Uranium-238 undergoes alpha decay. Therefore, uranium-238 will


b. change into a different element altogether.

Hope these answer the questions. Have a nice day.

What are cumulative pollutant examples?

Answers

a very fatal disese that causes you to poop blood 

A 0.0489 mol sample of a nutrient substance, with a formula weight of 114 g/mol, is burned in a bomb calorimeter containing 6.56 × 10² g h2o. given that the fuel value is 2.04 × 10⁻¹ in nutritional cal when the temperature of the water is increased by 1.73°c, calculate the fuel value in kj.

Answers

To calculate the fuel value in kJ, we need to convert the nutritional calories to kilojoules.

1 nutritional calorie (cal) = 4.184 kilojoules (kJ)

First, let's calculate the energy released by burning the 0.0489 mol sample of the nutrient substance in calories:

Energy released = moles of nutrient substance * formula weight * fuel value

Energy released = 0.0489 mol * 114 g/mol * 2.04 × 10⁻¹ cal

Next, let's convert the energy released from calories to kilojoules:

Energy released (kJ) = Energy released (cal) * 4.184 kJ/cal

Now, let's substitute the given values into the equations:

Energy released = 0.0489 mol * 114 g/mol * 2.04 × 10⁻¹ cal
Energy released ≈ 0.11185 cal

Energy released (kJ) = 0.11185 cal * 4.184 kJ/cal
Energy released (kJ) ≈ 0.467 kJ

Therefore, the fuel value of the nutrient substance is approximately 0.467 kJ.

Final answer:

To calculate the fuel value in kJ, convert nutritional calories to joules and then to kilojoules.

Explanation:

To calculate the fuel value in kJ, we need to convert the nutritional calories to joules and then to kilojoules. We can use the equation: fuel value (in kJ) = fuel value (in cal) x 4.184 / 1000. Given that the fuel value is 2.04 × 10⁻¹ nutritional cal, we can substitute it into the equation to get the fuel value in kJ.


fuel value (in kJ) = 2.04 × 10⁻¹ x 4.184 / 1000 =8.5288 x 10⁻³ kJ

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How does the VSPER theory explain molecular shapeA. Electron pair attractions pull atoms together
B. Electron pairs repelling each other push atoms apart
C. Valence electrons modify core electron orbitals
D. Intermolecular forces distort electron bonds

Answers

Answer:

B. Electron pairs repelling each other push atoms apart

Explanation:

The VESPR theory explains molecular shape by suggesting that electron pairs repelling each other push atoms apart.

If an atom is bonded to two or more other kinds of atoms as in many covalent molecules and ions, the shape of the system is determined by the geometry of the bonds around the central atom.

  • The variations in the bond angles of such molecules is explained by the valence shell electron pair repulsion theory.
  • All the electrons will orient themselves in such a way to minimize the electrostatic repulsion between them.
  • The repulsions determines the geometry of the covalent bonds around the central atom.
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