CHEMISTRY HIGH SCHOOL

When a substance changes from one phase to another, which of the following occurs?

Answers

Answer 1
Answer:

The answer is that the substance loses or gains heat.
Answer 2
Answer:

Answer:

The heat of the substance changes.

Explanation:

Substances can be made to change phases by fluctuating the temperature, the pressure, or both.

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Is glucose an pure substance or mixture?

Answers

a pure substance hope this helped
yes glucose is a pure substance

Describe the sequence of events in the formation of an evaporite

Answers

- Water enter from creeks, bringing whatever material it has dissolved in its way

- The materials is being build up throughout time in the lake or sea, causing its salinity to increase

- when this saline solution is evaporated, the ions in the water precipitate, forming an evaporite

Sediments are buried, pressure increases, volume of sediment decreases, sandstone compresses, saline solution becomes evaporated,and thenforms an evaporite.

What is an evaporite?

An evaporite can be defined as a mineral deposit containing saline substances that are produced due to the evaporation of a water body.

In this context, the sequence of events in the formation of an evaporite are listed as follows:

  1. Sediments are buried.
  2. Increase pressure pushes the grains closer together.
  3. Decrease in the volume of sediment, which cause fluids between the grains to be squeezed out.
  4. Sandstone are left tightly compressed together.
  5. The saline solution becomes evaporated, and then the ions contained in the water precipitates, forming an evaporite.

Read more on evaporite here: brainly.com/question/506772

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The mass of a proton is approximately equal to(1) 1 atomic mass unit
(2) 12 atomic mass units
(3) the mass of one mole of carbon atoms
(4) the mass of 12 moles of carbon atoms

Answers

The correct answer is option 1. The mass of a proton is approximately equal to 1 atomic mass unit. They almost have the same mass with a neutron while the electron is about 2000 times lighter than the two. The three mentioned particles are the subatomic particles found in an atom.

Final answer:

The mass of a proton is approximately equal to 1 atomic mass unit (AMU), which is much lighter than the weight of a mole of carbon atoms or 12 moles of carbon atoms.

Explanation:

The mass of a proton is approximately equal to 1 atomic mass unit (AMU). This measurement is a standardized unit of mass that physicists and chemists use to express the atomic and molecular weights of elements.

The proton, along with the neutron, makes up the nucleus of an atom, and both have approximately the same mass, which is about 1 AMU. This is substantially lighter than the weight of one mole of carbon atoms (approximately 12 grams), and even more so compared to the mass of 12 moles of carbon atoms.

Learn more about Proton Mass here:

brainly.com/question/36611410

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Consider the following equation: 0.0136 g + 2.70 × 10-4 g - 4.21 × 10-3 g = ? How many digits to the right of the decimal point should be used to report the result?

Answers

Answer:

It should be used 2 digits to the right of the decimal point to report the result

Explanation:

When adding or subtracting two decimal numbers, the number of digits to the right of the decimal point in the result is equal to the amount with the least number of decimal places.

In this case we have 4 decimal places in 0.0136 g, 2 decimal places in 2.70 × 10-4 g and 2 decimal places in 4.21 × 10-3 g, so, the least number of decimal places is 2 and that should be the number of digits to the right of the decimal point in the result.

Then the result of the sum should be 9.66 × 10-3 g

I got 2.......................

The hormone thyroxine is secreted by the thyroid gland and has the formula: C15H17NO4I4. How many milligrams of Iodine can be extracted from 15.0 grams of thryoxine?

Answers

Answer : The mass of iodine extracted can be 9796.7 mg

Explanation : Given,

Mass of thryoxine = 15.0 g

Molar mass of thryoxine = 776.86 g/mole

The molecular formula of thryoxine is, C_(15)H_(11)NO_4I_4

In C_(15)H_(11)NO_4I_4 compound, there are 15 moles of carbon, 11 moles of hydrogen, 1 mole of nitrogen, 4 moles of oxygen and 4 moles of iodine.

First we have to determine the moles of thryoxine.

\text{Moles of thryoxine}=\frac{\text{Mass of thryoxine}}{\text{Molar mass of thryoxine}}=(15.0g)/(776.86g/mole)=0.0193moles

Now we have to determine the moles of iodine.

As, 1 mole of thryoxine has 4 moles of iodine

So, 0.0193 mole of thryoxine has 4* 0.0193=0.0772 moles of iodine

Now we have to determine the mass of iodine.

\text{Mass of iodine}=\text{Moles of iodine}* \text{Molar mass of iodine}

\text{Mass of iodine}=(0.0772mole)* (126.9g/mole)=9.7967g=9796.7mg

conversion used : (1 g = 1000 mg)

Therefore, the mass of iodine extracted can be 9796.7 mg
I'm pretty sure it's 9726 milligrams of iodine. Hope this helps.

What color is potassium iodide and lead nitrate ? (is) because it is mixed and it is all one as a compound or a chemical formula or equation .

Answers

Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate!
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