CHEMISTRY HIGH SCHOOL

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

Answers

Answer 1
Answer:

Physical change.

Explanation:

  • This is a physical change.
  • The reason for escaping pops is the water caught internal parts it's bit.
  • Inside the event that the bit is warmed to a tall satisfactory temperature, this water will modify into steam. Due to the troublesome and for the preeminent parcel nonporous shell, the steam has no put to go, coming nearly in a buildup of weight internal parts the bit.
  • Once the weight gets tall satisfactory and the temperature comes to around 180 degrees Celsius (355 degrees Fahrenheit), the pops escape from the skillet or bursts and the popcorn is turned internal parts out.

Related Questions

Which of the following is most likely to be amorphous?-glass -solid sulfur -solid calcium -gold
An evaporation-crystallization process is used to obtain solid potassium sulfate from an aqueous solution of this salt. The fresh feed to the process contains 19.6 wt% K₂SO₄. The wet filter cake consists of solid K₂SO₄ crystals and a 40.0 wt% K₂SO₄ solution, in a ratio 10.0 kg crystal/kg solution. The filtrate, also a 40.0 wt% K₂SO₄ solution, is recycled to join the fresh feed. Of the water fed to the evaporator, 45.0% by weight is evaporated. The evaporator has a maximum capacity of 175. kg water evaporated/s. a) Assume the process is operating at maximum capacity. Draw and label a flowchart and do the degreeof-freedom analysis for the overall system, the recycle-fresh feed mixing point, the evaporator, and the crystallizer. b) Calculate the maximum production rate of solid K₂SO₄, the rate at which fresh feed must be supplied to achieve this production rate, and the recycle ratio kg/h recycled stream to kg/h fresh feed stream.
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What is the most common salt found in ocean water?
Ground water has some minerals dissolved in it. If you heat this water, collect the vapor in another container, and then cool it, you will get pure, or distilled, water. What makes this process a physical change?It forms a new substance (minerals), which is a physical change. It forms a new substance (water vapor), which is a physical change. It changes the color of water, which is a physical change. It changes the molecular structure of water, which is a physical change. It separates dissolved substances, which is a physical change.

Can someone show me a step by step with the answer?

Answers

Answer:

6 mols HCl

Explanation:

(I'm an AP chemistry student but not perfect at this stuff)

you can use the Molarity=Moles/L equation here:

(6M)=(moles HCl)/(1L)

divide by 1 on both sides to isolate the moles of HCl

this gets you 6 moles HCl.

Again I'm just a student so my answer might be wrong, but this question should just require the M=mols/L equation :).

Why does vinegar dissolve in water but oil does not? A. Vinegar is nonpolar like water, but oil is polar. B. Vinegar is a pure substance, but oil is already a mixture. C. Vinegar is polar like water, but oil is nonpolar. D. Vinegar is a mixture, but oil is a pure substance like water.

Answers

The answer is C. Vinegar is polar like water, but oil is nonpolar this is due to the fact that if it dissolves in water it is mostly polar so the third choise represented above is definitely correct one.

Vinegar dissolve in water but oil does not because vinegar is polar like water, but oil is nonpolar and the correct option is option C.

The dissolving process depends on the polarity of the substances involved. Water is a polar molecule, meaning it has a positive and negative end, while vinegar contains acetic acid, which is also polar. Since both water and vinegar are polar, they can mix and dissolve in each other easily.

On the other hand, oil is nonpolar, meaning it lacks a positive and negative end. Because of this, oil cannot dissolve in water, which is polar. Instead, oil and water will separate into distinct layers. This phenomenon is due to the "like dissolves like" rule, where polar substances dissolve best in polar solvents and nonpolar substances dissolve best in nonpolar solvents.

Thus, the ideal selection is option C.

Learn more about Polar and nonpolar substances, here:

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which equation listed matches the following word equation? when lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are formed.

Answers

When lithium hydroxide pellets are added to a solution ofsulfuric acid, lithium sulfate and water are formed. The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.

What is balanced chemical reaction ?

A chemical equation is said to be balanced if the quantity of each kind of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Following the rule of conservation of mass requires that a chemical equation be balanced. The balance of a chemical equation is disregarded by the rule of conservation of mass. The law states that a chemical process cannot produce or destroy matter.

When lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are produced.

Thus, The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.

To learn more about the balancedchemical reaction, follow the link;

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LiOH + H2SO4 → Li2SO4 + H2O

Balance the equation:

Reactants:
Li = 1 • 2
O = 1 • 2 + 4
H = 1 • 2+ 2
S = 1

Products:
Li = 2
O = 4 + 1 • 2
H = 2 • 2
S = 1

Balanced Equation:

2LiOH + H2SO4 → Li2SO4 + 2H2O

Which statement describes a physical change?a. A carton of milk souring
b. A piece of silver flatware tarnishing
c. Dry ice subliming into carbon dioxide
d. Two clear solutions forming a precipitate when mixed

Answers

The correct answer C. Dry ice subliming to carbon dioxide is an example of a physical change. This type of change is when only the appearance changed but the substance is still the same. It is the opposite of a chemical change where a new substance is formed from this change.

What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?

Answers

Answer;

From highest to lowest is Li>Na>K>Rb.

Explanation;

- Ionization energy is the energy that is required to dislodge or remove an electron from the outer most energy level or energy shell. The first ionization energy is the energy required to remove the first electrons from the outermost energy shell.

- Lithium will have the highest first ionization energy, as the outer electron is closer to the pull of the nucleus and not shielded by full shells. This means that rubidium will be the lowest.

Answer;

From highest to lowest is Li>Na>K>Rb.

Explanation;

- Ionization energy is the energy that is required to dislodge or remove an electron from the outer most energy level or energy shell. The first ionization energy is the energy required to remove the first electrons from the outermost energy shell.

- Lithium will have the highest first ionization energy, as the outer electron is closer to the pull of the nucleus and not shielded by full shells. This means that rubidium will be the lowest.
The first ionization energy is the energy that the atom lost its first electrons. The energy decrease and the atom is more reactive. So from highest to lowest is Li>Na>K>Rb.

1. An unknown compound was found to have a percent composition of: 47.0%potassium, 14.5% carbon, and 38.5 % oxygen. What is its empirical formula? If
the true molar mass of the compound is 166.22 g/mol, what is its molecular
formula?

Answers

Answer:The empirical formula is KCO2

Explanation:
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