19. Chemical properties can be used to
(1) differentiate between two compounds
(2) determine the temperature of a substance
(3) determine the density of a substance
(4) differentiate between two neutrons

The addition iodine to cornstarch solution and produce a new, blue substance is a chemical change.

Chemical changes can be defined as a change of material when two different substance combine to form a new substance with different properties and one or more than one new substance can be formed.

There are basically five type of chemical reactions.

Thus, the addition iodine to cornstarch solution and produce a new, blue substance is a chemical change.

To learn more about  chemical change, refer to the link below:

https://brainly.com/question/2591189

#SPJ1

Answer

b. It produces carbon dioxide when burned in pure oxygen.

Explanation

The reaction between diamond and oxygen, producing carbon dioxide is not a physical property of diamond, it is a chemical property because breaking and synthesis of chemical bonds occur.

3 H₂    +    N₂   →   2 NH₃

   ↓            ↓

4 mol       3 mol

Since the moles of N₂ is the smaller of the two reactants, then N₂ is the limiting factor (the reactant that will decide how much ammonia is produced since it has the smaller amount of moles). ∴ we have to use it in calculating the number of moles of ammonia

The mole ratio of N₂ to NH₃ based on the balanced equation is 1 to 2.

∴ the moles of NH₃ = moles of N₂ × 2

                                =  3 moles × 2

                                = 6 moles

The full sentences about curved arrow pushing mechanism  following michael (conjugate) addition reaction is given below:

A conjugate addition with a carbanion as the nucleophile is described as  as the Michael reaction. For the mechanism of this type of process, look at the Michael addition of a simple enolate.

During a Michael reaction the enolate functions as  as a nucleophilic donor and the α, β-unsaturated carbonyl does the job as the electrophilic acceptor.

In conclusion, the mechanism is described as a mixture of an alpha-substitution for the enolate and a conjugate addition for the α, β-unsaturated carbonyl.

Learn more about Michael reaction at:

https://brainly.com/question/29768817

#SPJ1

Answer:

(A) chlorine is an oxidizing agent in this reaction so it oxidize iodine and it itself is reduced

Explanation:

Cl2 oxi no. = 0 became Cl- oxi no. = -1

so it is reduced

I- oxi no. = -1 became I2 oxi no. = 0

so it oxidized

In the given case, where there are degeneracies in the energy spectrum, some of these degeneracies can be explained by simple symmetry. If states A and B are degenerate due to this symmetry, it implies that there is a relationship between them.

The relationship between the degenerate states A and B can be understood through the concept of symmetry operations. Symmetry operations are transformations that leave the physical properties of a system unchanged. These operations include rotations, translations, and reflections. If states A and B degenerate because of a specific symmetry operation, it means that this operation can transform state A into state B without changing the energy of the system. In other words, the symmetry operation connects the two degenerate states.

The specific relationship between states A and B depends on the nature of the symmetry operation involved. It could be a rotational symmetry, where the states are related by rotation. It could also be a translational symmetry, where the states are related by a translation. Alternatively, it could be a reflection symmetry, where the states are related by a reflection. In summary, if states A and B degenerate due to a symmetry operation, between them is established through that symmetry operation, which can be a rotation, translation, or reflection.

To know more about the energy spectrum please refer:

https://brainly.com/question/29061745

#SPJ11

Polysaccharide is a type of carbohydrate (such as glycogen, cellulose, or starch) whose molecules are made up of many sugar molecules bound together.

What purpose does the polysaccharide serve?

In general, polysaccharides serve one of two purposes: they either store energy or sustain structural integrity. Highly compact polymers like starch and glycogen are employed to store energy. In plants and animals, cellulose and chitin, two linear polymers, provide structural support.

What is plant polysaccharide?

More than half of the carbs we consume come from starch, which is the most significant source of carbohydrates in the human diet. Granules of it can be found in plants. Amylose and amylopectin, two polymers, are combined to form starch. 10%–30% amylose and 70%–90% amylopectin make up natural starches.

Learn more about the Polysaccharides with the help of the given link:

https://brainly.com/question/780562

#SPJ4

The statement is false. A catalyst does not react with the product. It increases the rate by lowering activation energy.

The assertion is bogus. An impetus doesn't respond with the result of a compound response. All things being equal, it builds the pace of the response by bringing down the initiation energy expected for the response to happen. This is accomplished by giving an elective response pathway that has a lower enactment energy. Accordingly, more reactants can beat the energy obstruction and respond to frame items, and the harmony is accomplished all the more rapidly. Since the impetus isn't consumed in the response, it doesn't influence the place of harmony, nor does it shift the balance to the right or left. Impetuses are fundamental in numerous modern cycles, as they can speed up the pace of the response and save time and assets.

To learn more about catalyst, refer:

https://brainly.com/question/30651967

#SPJ4

The two atoms that are of elements in the same group in the Periodic Table are atoms 1 and atom 4.

The correct option is B.

Atoms in the same group in the periodic table share some common characteristics. Here are a few generalizations:

The elements in the same group of the periodic table share some common properties due to their similar electronic configurations.

Leearn more about the periodic table at: https://brainly.com/question/25916838

#SPJ1

Depending on the chemical, these longer-term health effects might include:

Answer:

A) oxidizing agent is SO2

B) NaClO is the oxidizing agent

Explanation:

A) This is a redox reaction in which oxidation and reduction occur simultaneously.

Thus, in 2H2S(g) + SO2(g) -> 2H2O(l) + 3S(s);

H2S is reduced as follows;

H2S → S + 2H+ + 2e−

We can see that SO2 has been reduced while H2S gets oxidized since it has changed state from - 2 to 0 . Thus sulphur dioxide is the oxidizing agent.

B) SO2(g) + H2O(l) + NaClO(aq) -> NaCl(aq) + H2SO4(aq)

In this, SO2 undergoes oxidation and NaClO is the oxidizing agent

Answer:

Balanced Equation for reaction between Magnesium and Oxygen:

2Mg + O₂ --> 2MgO

Molar Mass of MgO is the atomic masses listed on the periodic table for the two elements Magnesium and Oxygen. Magnesium's molar mass is 24g/mol, and Oxygen's molar mass is 16g/mol. So MgO's molar mass would be 24 + 16 = 40g/mol.

The equation to find moles is:

\(moles \ = \ \frac{mass}{molar \ mass}\)

So if we rearrange this equation to find for mass:

\(mass = moles \ * \ molar \ mass\)

So you have to multiply 0.300 moles by 40, which gives you 12g

Meaning the mass of Magnesium Oxide is 12g.  

Answer:

C.) 4.85 x 10⁻¹⁹ J

Explanation:

To find the energy, you need to use the following equation:

E = hc / w

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> w = wavelength (m)

Once you have converted nanometers to meters, you can plug the given values into the equation and solve.

410 nm                1 m
-------------  x  ----------------------  =  4.10 x 10⁻⁷ m
                        1 x 10⁹ nm

E = hc / w

E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)

E = 4.85 x 10⁻¹⁹ J

C. the denser the plants the better.

Answer:

C

Answer: Plants with higher density of the bacteria on their roots have increased rates of survival reproduction

Explanation:

Answer:

6 neutrons

Explanation:

6 neutrons

Boron having an atomic number of 5 means that it will have 5 protons. 11 atomic mass units in total. Neutrons also have a atomic mass unit of 1. So there are 6 neutrons

The article "Treatment of early-stage erythematotelangiectatic rosacea with a Q-switched 595-nm Nd:YAG laser" by Goo BL, Kang JS, Cho SB (2015) focuses on the use of a specific laser, the Q-switched 595-nm Nd:YAG laser, for treating early-stage erythematotelangiectatic rosacea.

The study is published in the Journal of Cosmetic and Laser Therapy, volume 17, issue 3, pages 139-142. The mentioned article investigates the effectiveness of using a Q-switched 595-nm Nd:YAG laser in the treatment of early-stage erythematotelangiectatic rosacea, a common skin condition characterized by facial redness and visible blood vessels. The study aims to evaluate the outcomes of this laser treatment modality.

The Q-switched 595-nm Nd:YAG laser is a specific type of laser that emits light at a wavelength of 595 nanometers (nm). This particular wavelength is targeted at the blood vessels and redness associated with rosacea, aiming to reduce the visible signs and symptoms.

The authors likely conducted a clinical study involving patients with early-stage erythematotelangiectatic rosacea and assessed the efficacy of the laser treatment. The article may include details on the treatment protocol, the number of sessions, the outcomes observed, and any side effects or complications reported.

Overall, this study contributes to the understanding of the use of the Q-switched 595-nm Nd:YAG laser as a potential treatment option for early-stage erythematotelangiectatic rosacea, providing insights into its effectiveness and potential benefits for patients with this condition.

To learn more about rosacea, here

https://brainly.com/question/31631139

#SPJ4

The number of atoms of Oxygen (O) in 7. 23 moles of Ca(NO₃)₂ = 2.61 × 10²⁵ atoms.

To determine the number of atoms of O in 7.23 moles of Ca(NO₃)₂, we need to use the formula for the number of atoms, which is:
Number of atoms = Number of moles × Avogadro's number × Number of atoms in one molecule
Avogadro's number is 6.022 × 10²³ atoms/mole.
In one molecule of Ca(NO₃)₂, there are 6 atoms of O.
So, the number of atoms of O in 7.23 moles of Ca(NO₃)₂ is:
Number of atoms of O = 7.23 moles × 6.022 × 10²³ atoms/mole × 6 atoms/molecule

= 2.61 × 10²⁵ atoms of O
Therefore, there are 2.61 × 10²⁵ atoms of O in 7.23 moles of Ca(NO₃)₂.

Learn more about atomic number here: https://brainly.com/question/29749207

#SPJ11

Answer:

Sodium fluoride is a colorless crystalline solid or white powder, or the solid dissolved in a liquid. It is soluble in water. It is noncombustible.(I got this answer from g o o g l e)

Explanation:

Answer:

i) increase

ii) decrease

iii) remain the same

iv) No, because it dissociates completely.

Explanation:

On a 10-fold dilution of a weak acid, the pH will increase because the concentration of hydrogen ions will decrease thereby increasing the pH to close to that of water.

On a 10-fold dilution of a weak base, the pH will decrease due to the removal of hydroxide ions from the solution. This results in the solution having a H closer to that of water.

If one adds a very small amount of strong base to a buffered solution, the pH will remain constant because a buffer solution acts to withstand any change to its pH on the addition of small quantities of either an acid or a base.

A buffer solution cannot be made with a strong acid because thy undergo complete dissociation. Therefore, any small addition of base or acid will result in very large changes in the pH of the solution. A buffer solution is made with a weak acid and its conjugate base or a weak base and its conjugate acid.

Answer:

It will be : (in simple terms)

Condensation of hot steam or hot vapor on the cooler skin releases the water's latent heat of vaporization, rapidly raising the temperature of the skin which will result in steam burns.

Hope it helped

All the best!!

Answer:

Depends how your flirting

Explanation:

Answer:

yes, because if you love someone you wont want anyone else. therefore if you flirt your giving someone else the attention your significant other is suppose to get from you.

Explanation:

Answer:

exactly 25 g​

Explanation:

The mass of an object is universally the same every where. Even in outer space.

This is because, mass is the amount of matter contained in a substance. Since there is no loss in the amount of matter, the mass of the body stays the same.

Mass accounts for every individual matter present in a substance.

When they remain the same, mass does not change. Only a change in the amount of matter in a body can cause variation in mass.

Therefore, at the bottom of the ocean, a body will have the same mass as on top and even at sea level.

Answer:

c. exactly 25 g                

Explanation:

The daily decay rate of the substance is approximately 0.793 (rounded to 3 decimal places).

The half-life of the material = 3 days To calculate:

The daily decay rate of the substance Formula used:

1/2^(t/h), where t = time elapsed and h = half-life of the substance Solution:

The formula for calculating the daily decay rate of the substance is given by:

1/2^(t/h)Where t is the time elapsed and h is the half-life of the substance.

The daily decay rate of the substance is calculated as follows:1/2^(1/3) ≈ 0.793.

To know more about decay rate please refer to:

https://brainly.com/question/30068164

#SPJ11

Answer: Because hydrogen is a gas.

Explanation: If children were running around with balloons filled with hydrogen gas, then they would catch fire. So the answer to your question is, its simply dangerous.

The amount of energy that must be transferred as heat for a reversible isothermal expansion of an ideal gas is equal to the change in entropy multiplied by the temperature of the gas. Therefore, for the reversible isothermal expansion of an ideal gas at 99°C, the energy that must be transferred as heat is 25.6 J/K x 99°C = 2532.4 J.

Here, correct answer will be

This energy is necessary for the expansion to occur reversibly, meaning that the temperature of the gas remains constant and the entropy increases.

This energy is used to overcome the intermolecular forces that would normally resist the expansion of the gas, allowing it to expand reversibly and increase its entropy.

Know more about isothermal expansion here

https://brainly.com/question/4674503#

#SPJ11

Answer:

The mass remains same after and before the reaction

Explanation:

This is because of law of conservation of mass

Which states that

Answer:

2-Methylhexane

Because Ethylexane does not have hydrogen molecules neither,also it only has 2 options but they're just repeated

Answer:

wala ako alam sagot sorry