CHEMISTRY HIGH SCHOOL

Which of the following materials is likely to be the best insulator?-silver
-phosphorus
-silicon
-calcium

Answers

Answer 1
Answer:

Answer: Option (b) is the correct answer.

Explanation:

Insulator are the substances which do not conduct electricity. It is known that metals are good conductors of electricity. Whereas non-metals do not conduct electricity.

Out of the given options, silver, and calcium is a metal that means they are good conductors of electricity and are not insulators.

On the other hand, silicon is a metalloid, that is, it shows properties of both metals and non-metals. Hence, it will also show conductivity.

Phosphorus is a non-metal and therefore, it does not conduct electricity. As a result, out f the given options it will act as the best insulator.

Answer 2
Answer: The element most likely to be the best insulator is the worst conductor among the four when you test for their conductivity. The answer among the four options given is 'phosphorus'. I hope this helps you on your assignment. 

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Which of the following is the smallest volume? (2 points) 2500 mL 250 cm3
2.5 x 10-2 L
25 m3

Answers

So to put them all in the same units we have 
2500 mL 
250 mL 
25mL 
2,500,000,000mL 

So the third one is the smallest
The third is the answer becuase you multiply

What gives orange juice its acidic qualities ?

Answers

More than half of children between the ages of four and 18 are suffering some degree of tooth erosion, according to the British Dental Association. And fruit juices - particularly orange juice, with its high sugar and acid content - could be a major culprit.But orange juice is still one of the best sources of vitamin C, for both children and adults alike. So what should we do?Nutritionist Sarah Schenker, from the British Nutrition Foundation, says: 'Children are drinking less milk than they used to, and more soft drinks. Although orange juice has a role in a healthy balanced diet, its sugar and acid content lowers the pH of the mouth and makes the teeth more vulnerable to dental plaque.'If you are worried about the effect on teeth, dilute it with water or drink it with food and avoid between meals.' As a guide, there are three types of sugar to look out for in orange juice products.Although all are potentially harmful to the teeth, dentists suggest the safest are the sugars naturally present in the fruit, while juices boosted with artificial sweeteners and added sugars are not as healthy.
Hope it helps but you are not 99 years old
To not give an entire explanation of what befalls kids, in short orange juice has citric acid contained in it which is what gives it its acidic qualities

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.

Enter the symbol of a sodium ion, Na+, followed by the formula of a sulfate ion, SO42−. Separate the ions with a comma only—spaces are not allowed.

Answers

Answer: Na⁺, SO₄ ²⁻.


Justification:


This is just a part of a bigger question.


But the instructions are complete to construct the ions.


The first ion requested is the sodium ion.


The symbol of sodium is Na.


When an electron is removed from the neutral atom, the atom wil result with an excess of protons, which translates onto an excess of positive charge.


Then, to show the new particle you must add a positve sign (+) in the form of superscript.


That is why you write Na⁺. By the way, a positive ion is named cation.


Regarding sulfate ion, it comes from the sulfuric acid, when you remove the two hydrogen atoms, each with a positive charge, then the sulfate ion will stand with a negative charge of 2.


The charge is told to belong to the entire ion, not a particular atom, soy you wirte it with the 2- symbol as a superscript for the entire species:


SO₄ ²⁻. A negative ions is called anion.


The answer, then, is: Na⁺, SO₄ ²⁻.

Writing the ion: Na⁺,SO₄²⁻

Further explanation

Ionic compounds consisting of cations (ions +) and anions (ions -)

The naming is preceded by the cation then the anion with the -ide suffix added

Generally for this ion compound consists of metal elements as cations and non-metals as anions

Metal: cation, positively charged.

Nonmetal: negative anion.

The anion cation's charge is crossed

Example:

Fe₂S₃

Fe charge = 3+

S charge = 2-

The writing of the ionic charge is placed as a superscript behind the molecule/ atom, and the number is written before the positive or negative sign. For a single charge, there is no need to write the number

Example

Cl⁻ (single charge)

Mg²⁺ not Mg⁺²

For the element Na symbol which is group 1A and releases one electron, the symbol writing would be: Na⁺(single charge)

For polyatomic ions, the superscript charge is written after the subscript on the polyatomic element, so it becomes SO₄²⁻

These two ions when combined and bind to Na₂SO₄ (The anion cation's charge is crossed)

if written separately as Na⁺, SO₄²⁻

Learn more

the chemical formula for each ionic compound.

brainly.com/question/11545331

two functional groups that contain ionic charges

brainly.com/question/1687047

Binary ionic compounds

brainly.com/question/2099598

Keywords: chemical compound, the naming of chemical compounds

Calculate the pH of the aqueous solution of 0.0243 M HNO3(aq).

Answers

pH= -log [H^(+)]
    = 1.61

Find the [H+] in an acetic acid solution that has a pH of 5.12

Answers

Data:
pH = 5.2
[H+] = ?

Knowing that: (Equation to find the pH of a solution)
pH = -log[H+]

Solving:
pH = -log[H+]
5.2 = - log [H+]
Knowing that the exponential is the opposite operation of the logarithm, then we have:
[H+] = 10^(-5.2)
\boxed{\boxed{[H+] = 6.30*10^(-6)}}\end{array}}\qquad\quad\checkmark
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