How do we know that caramelizing sugar is a chemical change ?

Answers

Answer 1
Answer: Chemical transformation: it's all transformation changes the composition of matter, i.e. that matter produces a new substance with different initial properties burning sugar to make caramel, we cannot retrieve the initial sugar.

hope this helps!

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Which is denser, isopropyll alcohol( rubbing alchohol) or water?

Answers

Isopropyll is less dense than water.

If you were to get a gallon of water and a gallon of Isopropyll alcohol and weigh it, the alcohol would be lighted. Another way is to pour water and the alcohol in a cup and you will see that the alcohol is above the water(floating) because its lighter and less dense. Isopropyll alcohol is used for a lot of things, including cleaning certain components of computers:D

So based on this, water is more dense

Answer:

water is denser

Explanation:

if you were to fill 2 55 gallon barrels of each product the water would weigh more because water is more dense

Which are functions of nucleic acids?Choose all answers that are correct.

A.
to defend against infection

B.
to provide structural support

C.
to carry genetic information

D.
to process information

Answers

i would go with b and c if you can choose both

As the temperature of a substance decreases the average kinetic energy of its particles?

Answers

The average kinetic energy also decreases

Final answer:

When the temperature of a substance decreases, the average kinetic energy of its particles also decreases. This is because the temperature of a substance is proportional to the average kinetic energy of its particles. The slower the particles move, the lower the kinetic energy.

Explanation:

The question refers to the relationship between the temperature of a substance and the average kinetic energy of its particles. According to the kinetic-molecular theory, the temperature of a substance is proportional to the average kinetic energy of its particles. When the temperature of a substance rises, the particles vibrate more in solids or move more rapidly in liquids and gases, indicating an increase in kinetic energy. Conversely, if the temperature decreases, the kinetic energy also decreases, and the particles move more slowly.

For instance, when the temperature of a gas increases, its average kinetic energy increases, more molecules have higher speeds and fewer molecules have lower speeds. The distribution shifts towards higher speeds overall. If the temperature decreases, the opposite happens: the average kinetic energy decreases, more molecules have lower speeds and fewer molecules have higher speeds. The distribution shifts towards lower speeds overall.

Learn more about Kinetic Energy and Temperature

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As the pressure on the surface of a liquid decreases, the temperature at which the liquid will boil(1) decreases
(2) increases
(3) remains the same

Answers

Answer: option (1) decreases.


Explanation:


May be you have experienced that: when you go to the beach, where the atmposhpere pressure is greater than the atmosphere pressure in places that are at higher altitudes, the water takes longer to boil. That is because the boiling temperature is greater, and you need more total heat (more time) to permit the liquid to reach that temperature.


The reason why that happens is because substances boil when the vapor pressure (the pressure of the particles of vapor over the liquid) equals the atmosphere pressure. So, when the atmposhere pressure increases, the temperature at which the vapor pressure reaches the atmosphere pressure also increases, and when the atmosphere pressure decreases, the temperature at which the vapor pressure reaches the atmosphere pressure decreases.



As the pressure on the surface of a liquid decreases, the temperature at which the liquid will boil(1) decrease.

what mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide? working on stoichiometry and need help!

Answers

CI2 + 2Nal ---> 2NalCI + I2
Nal = 149.9 g/mol.
NaCI = 58.5 g/mol
2 mol Nal makes 2 mol NaCI
0.29 g Nal x ( 1 mol / 149.9 g) = 0.0019 mol NaCI
00.19 mol NaCI x ( 58.5 g / 1 mol ) 0.11 g NaCI ( 2 sig figs)

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.