yo, i need help. 25 points and brainliest. :|

Answer:

2

Nobody is able to foresee the solubility of a product. There are some experimental rules, but they all have exceptions, that nobody is able to explain.

Just have a look on the Calcium salts made with the halogens (F, Cl, Br, I). There is a nice analogy among Cl, Br and I, but not F. Look ! The Calcium chloride CaCl2, bromide CaBr2 and iodide CaI2 are all extremely soluble in water. They are all soluble in less than their weight of water. But calcium fluoride CaF2 is among the least soluble product on Earth. The principal mineral for Fluoride is CaF2, and it can be found everywhere at the surface of the Earth. If this mineral would have been at least a little soluble in water, the rains would have washed away this mineral in the geological times. Why is there such a huge difference between calcium fluoride and the other halogenides ? Nobody knows !

Another example. Potassium perchlorate is the only potassium salt which is very weakly soluble in water. By comparison, Sodium perchlorate is extremely soluble in water. Why? Another example: the number of Silver compounds which are soluble in water is limited. In organic solvents, it is even worse. But the Handbook of Chemistry and Physics says that Silver perchlorate is soluble in toluene. Why? Nobody knows.

From time to time there are articles published in journals like the Journal of Chemical Education. The author is proud of displaying a theory filled with new parameters, for explaining the solubility of quite a lot of chemicals. But there are always exceptions, that he regrets not to be able to explain.

Answer:

ummmm

Explanation:

Answer:

B is correct

Explanation:

pls Brainliest

Answer:

Eddie reeling in a fish that he has caught

Explanation:

Answer:

The kind of ion is X2+ ( where the ion is formed as a result of the loss of two valence electrons)

Explanation:

The ratio of ions of the element X to the phosphate ions is 3 to 2

So what we have as formula of these will be;

X3(PO4)2

Generally we have the phosphate ion formula as; PO4^3-

So for this formula above to be possible then the element x will have a formula of its ion X2+

Answer:

The heart

Hand

Explanation:

The part of the human body that has the same role as the power source in a computer is the heart. A power source in a computer provides energy that powers the whole system.

Also, keyboard and mouse are input devices. They are used to give instruction and perform certain tasks on the computer system.

pH of solution = 9.661

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

pOH=-log[OH⁻]

[tex]\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339[/tex]

pH+pOH=pKw

[tex]\tt pH=14-4.339\\\\pH=9.661[/tex]

Answer:

Simple distillation

Answer:

[tex]\boxed {\boxed {\sf B. \ 22 \ grams}}[/tex]

Explanation:

We need to use the formula for heat of vaporization.

[tex]Q=H_{vap}*m[/tex]

Identify the variables.

[tex]H_{vap}=2260 \ J/g\\Q=50,000 \ J \\[/tex]

Substitute the values into the formula.

[tex]50,000 \ J=2260 \ J/g*m[/tex]

We want to find the mass. We must isolate the variable, m.

m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.

[tex]\frac{50,000 \ J}{2260 \ J/g} =\frac{2260 \ J/g*m}{2260 \ J/g}[/tex]

[tex]\frac{50,000 \ J}{2260 \ J/g} =m[/tex]

Divide. Note that the Joules (J) will cancel each other out.

[tex]\frac{50,000 \ }{2260 \ g} =m[/tex]

[tex]22.1238938 \ g =m[/tex]

Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.

[tex]22 \ g \approx m[/tex]

The mass is about 22 grams, so choice B is correct.

Answer:

Acids are named based on their anion — the ion attached to the hydrogen. In simple binary acids, one ion is attached to hydrogen. Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them.

Answer:

Manganese(II) sulfide

Explanation:

is a chemical compound of manganese and sulfur. It occurs in nature as the mineral alabandite (isometric), rambergite (hexagonal), and recently found browneite (isometric, with sphalerite-type structure, extremely rare, known only from a meteorite).

The chemical name for MnS₂ is manganese sulfide.

Ionic compounds are formed when ions with opposing negative and positive charges form ionic bonds and form compounds, which are compounds made of ions.

Ionic compounds are named by stating the cation first, followed by the anion. When a neutral atom loses one or more electrons, it acquires a positive charge and is called a cation and when an atom gains one or more electrons, it becomes an anion and acquires a negative charge.

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Answer: a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)

Explanation:

Thermal energy is the energy possessed by an object by virtue of its temperature. The hotter the substance, the more its molecules vibrate, and therefore the higher its thermal energy.

Thermal energy refers to the sum of kinetic, potential, vibrational ,electronic and rotational energies of the object.

For bodies at same temperature, the body with more molecules will have more thermal energy due to more collisions.

Answer:

n = 11.45 mol

Explanation:

Given data:

Number of moles = ?

Volume of gas = 98 L

Pressure = 2.8 atm

temperature = 292 K

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

2.8 atm × 98 L = n × 0.0821 atm.L/ mol.K   × 292 K

274.4 atm.L = n ×  23.97atm.L/ mol

n = 274.4 atm.L /23.97atm.L/ mol

n = 11.45 mol

Answer:

2.

Explanation:

When you put the paper in a solution, it will turn blue if it is basic, or red if it is acidic. If it does not change color, it is fairly neutral.

Answer:

im pretty sure its: homogeneous mixture

Explanation:

Answer:

In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.

Explanation:

Phoebus Aaron Theodor Levene was born in Sagor in Russia. He grew up in St. Petersburg and studied medicine at the Imperial Military Medical Academy. As a student he worked in the laboratory of his organic chemistry professor where he likely developed an interest in biochemistry.

In 1891, because of growing anti-Semitism in Russia, Levene and his family emigrated to the U.S. They arrived on the symbolic day of July 4. Levene went back to Russia almost immediately to finish his medical degree, but by 1892, he was in New York and practicing medicine on the Lower East Side.

Levene did not give up research. He enrolled as a special student at Columbia University and he split his time between his medical practice and research in the department of physiology. By 1894, he began publishing papers on the chemical structure of sugars. Two years later, Levene received his first appointment as an Associate in the Pathological Institute of the New York State Hospitals. Unfortunately, around this time, Levene contracted tuberculosis and was forced to take time off to recuperate.

Levene used the time between 1896 and 1905 to regain his health and to work with a number of well-known chemists, including Albrecht Kossel and Emil Fischer, the nucleic acid and protein experts of the time. In 1905, Levene was hired by the newly established Rockefeller Institute of Medical Research to head the biochemical laboratory. Levene did most of his nucleic acid work at the Rockefeller and stayed there until his death.

Levene was a cultured man, an art lover and a collector. The walls of his house were lined with either prints and paintings or overflowing bookshelves. Levene was extremely well-read and was fluent in Russian, English, French and German. He also spoke passable Spanish and Italian. His experience, knowledge and his generosity made him a favorite with colleagues and friends. He was also said to be a great teacher, enthusiastic and supportive.

Although mostly remembered now for his incorrect tetranucleotide theory of DNA, Levene published over 700 original papers and articles on the chemical structures of many biochemicals. Levene died in 1940, before the true significance of DNA became clear.

Explanation:

Answer

ice wedging .................

Answer:

ice wedging

Explanation:

Answer:

An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element. For example, K+1 is called the potassium ion, just as K is called the potassium atom.

Answer:

D

Explanation:

cracks from temperature changes is a type of physical weathering often known as freezing and thawing

Answer:

protons, neutrons, electrons

Explanation:

the three main subatomic particles that form an atom protons,neutrons and electrons. the center of the atom is called the nucleus.

Answer:

[tex]{\boxed {\sf Protons: +1, Nucleus}}[/tex]

[tex]\boxed {\sf Neutrons: 0, Nucleus}}[/tex]

[tex]\boxed {\sf Electrons: -1, Surrounding \ the \ Nucleus}}[/tex]

Explanation:

There are 3 subatomic particles: protons, neutrons, and electrons.

Protons

Charge

Location

Neutrons

Charge

Location

Electrons

Charge

Location

Answer:

the formation and evolution of stars and galaxies

Explanation:

One of the topic an astronomer will most likely study is the formation and evolution of stars and galaxies.

Astronomers are scientists that studies the universe, its components and how it works.

Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

Pls brainliest! :)

Answer:

The blades of the fan are spinning

An air flow is felt

The fan warms up

Explanation:

I've never seen sparks on a fan and there is no light produced. Don't over think the question.

Answer: chill google dat junk sis lol but i thought i could help i just dont wanna get u da wrong answer su

Explanation:

Answer:

200 grams

Explanation:

If the exact same amount is placed on the scale the weight won't change due to the law of conservation of matter.

After the orange has been peeled, the total mass of the orange and peeling will still be 200 grams.

Mass is a physical property of matter which measures the amount of substance in an object. It is measured in grams (g) or kilograms (kg).

According to the law of conservation of mass, when the orange is weighed with the peeling on, the mass of the peeling is included in the measurement.

However, when the orange is peeled, and both the peeling and orange are weighed the mass of the orange and peeling will remain same as 200 grams.

Therefore, the total mass of the orange and peeling after the orange has been peeled is 200 grams.

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Answer:

The element hydrogen has the simplest atoms, each with just one proton and one electron. The proton forms the nucleus, while the electron orbits around it.

Explanation:

Answer:

A.) It cannot be quickly replaced.

Explanation:

Aluminum is extremely useful to humans but is semi-difficult to produce. Because of this, your answer will be numero uno. (Or A.)

Answer:

Electrons occupy the regions around the nucleus(energy levels) while protons and neutrons are found in the nucleus

Answer:

Assuming pressure is held constant,the question reduces to a ratio and proportion type of question where;

At constant pressure,

21.0ft³-55.0°F

11.0fy³=11.0ft³/21.0ft³×55°F

The temperature is 28.809°F≈29°F

29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.

Temperature expresses hotness and coldness or a measure of the average kinetic energy of the atoms or molecules in the system.

Assuming pressure is held constant, the question reduces to a ratio and proportion type of question where;

At constant pressure,

21.0ft³- 55.0°F

11.0fy³ = 11.0ft³ ÷ 21.0ft³ × 55°F

The temperature is 28.809°F ≈ 29°F

Hence, 29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.

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