Identify the isotope that has atoms with 28 neutrons, 23 protons, and 23 electrons

A. ^28 Ni
B. ^23 V
C. ^23 Mn
D. ^51 Sb
E. ^51 V

Answer:

By adding, a few drops of AgNO3

Dilute HCl reacts with silver nitrate to give a white precipitate of silver chloride.

On the other hand there is no reaction observed when dilute Nitric acid is treated with silver nitrate solution. That is obvious

Reactions :-

HCl(aq) + AgNO3(aq) >>> AgCl(s) + HNO3(aq)

HNO3(aq) + AgNO3(aq) >>> No reaction + No precipitate

Answer: The bones block the x-ray particles to pass through it, and a study of the bones is possible using this technology.

Explanation:

PbO2 (s) + 4 HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O (l)

This is an oxidation-reduction (redox) reaction:

PbIV + 2 e- → PbII

(reduction)

2 Cl-I - 2 e- → 2 Cl0

(oxidation)

PbO2 is an oxidizing agent, HCl is a reducing agent.

Answer:

C

Explanation:

Answer:

3.2 x 10²¹molecules

Explanation:

Given parameters:

Volume of nitrogen gas = 120cm³

Unknown:

Mass of nitrogen gas = ?

Number of molecules  = ?

Solution:

To solve this problem, note that;

   1 mole of gas occupies a volume of 22.4L at STP

  Now;

   convert 120cm³ to L ;

           1000cm³  = 1L

           120cm³ gives 0.12L

    Since;

            22.4L of gas has 1 mole at STP

            0.12L of gas will have [tex]\frac{0.12}{22.4}[/tex]   = 0.0054mole at STP

So;

    Mass of N₂  = number of moles x molar mass

 Molar mass of N₂  = 2(14) = 28g/mol

    Mass of N₂  = 0.0054 x 28  = 0.15g

Now;

        1 mole of a gas will have 6.02  x  10²³ molecules

      0.0054 mole of N₂ will contain   0.0054 x  6.02  x  10²³ =

                          3.2 x 10²¹molecules

Answer:

D

Explanation:

The order of abundance from greatest to least in gases found in Earth's

atmosphere is nitrogen, oxygen, carbon dioxide.

There are various gases present in the atmosphere such as nitrogen,

oxygen, carbon dioxide etc. Each of them have their important functions in

ensuring the ecosystem is balance and for survival of the organisms present.

The most abundant element is Nitrogen which accounts for about 78

percent of air. Oxygen is the second most abundant with 21 percent present

in air. Others such as carbon dioxide and inert gases represent the

remaining percentage present in air.

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Answer:

8 metal are there in modern periodic table

Answer:

initial height, speed

Explanation:

Answer:

The variables for this experiment include the height of the track and the speed of the car. Use the drop-down menus to complete the sentences and identify the independent and dependent variables.

The independent variable, or the one that is intentionally manipulated, is  

✔ initial height

The dependent variable, or the one the response is measured in, is  

✔ speed

Explanation:

These were correct on edge.

Hope this helped!

Answer:

A. 0.00420 J/(gi°C)

Explanation:

i got it rigt

Answer:

When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause universal indicator to change from green toward purple.

Explanation:

The universal indicator turns the solution in red color then the solution must be strongly acidic. Therefore, option (B) is correct.

A universal indicator can be described as a pH indicator made of a solution of various compounds that exhibits many smooth color changes over a wide range of pH values to indicate the acidity or basicity of the solution.

The chemical indicator is a substance that indicates the color change, or the presence/ absence of a threshold amount of a chemical species, such as an acid or base in a solution.

There are many kinds of indicators such as Universal indicator, methyl orange, litmus, phenolphthalein, and bromothymol blue. They are utilized to tell the acidity and basicity of the solution by color change.

In an acidic medium, the universal indicator will show colors such as red, orange, yellow, orangish-yellow, etc. In the basic medium, the universal indicator will change its color to blue-violet or purple. In a neutral medium, it will show green color.

Therefore, the given color is red so the solution is strongly acidic as it has a very low pH value.

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Answer:

636.86 K

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T1) = 333 K

Initial pressure (P1) = 4 atm

Final pressure (P2) = 7.65 atm

Final temperature (T2) =?

NOTE: The volume is constant.

Since the volume is constant, we can obtain the new temperature the gas by using the following formula as illustrated below:

P1 /T1 = P2 /T2

4/333 = 7.65/T2

Cross multiply

4 × T2 = 333 × 7.65

4 × T2 = 2547.45

Divide both side by 4

T2 = 2547.45 / 4

T2 = 636.86 K

Therefore, the new temperature of the gas is 636.86 K

Answer:

It's 637 <3

Explanation:

Round 636.86 to get 637, proven on CK12

Answer:

B

Explanation:

None of the other responses doesn't seem right. A is to broad someone can be a scientist and might not be highly educated. C not every scientist studies this field so no. Same goes for D

Answer:

B

Explanation:

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

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

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol  × 0.0821 atm.L/ mol.K   ×298 K

P = 8.61 atm.L /  1.75 L

P = 4.92 atm

Answer:

Explanation:

2KClO₃ = 2KCl + 3O₂

2 moles of potassium chlorate gives 3 moles of oxygen gas

20 moles of potassium chlorate will give 30  moles of oxygen gas .

30 moles of oxygen = 30 x 6.02 x 10²³ molecules of oxygen .

= 180.6 x 10²³ molecules of O₂ .

Answer:

A

Explanation:

Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. ... The insulator serves as a handle for moving the conductor around on top of a lab table

Answer:

1. Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.

2. Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.

3. Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.

4. Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:

One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.

A positively charged cloud comes near a negatively charged cloud.

A cloud with either a positive charge or a negative charge comes near the earth.

Answer:

Answers are below:

Explanation:

There are 18 groups and 7 periods in the modern periodic table. The atomic size and metallic character of elements increase down a group. Also, the atomic size and metallic character of elements decrease from left to right in a period.

Have a good night!

Answer:

22g

Explanation:

Given parameters:

Mass of element A = 18g

Mass of element B  = 4g

Unknown:

Mass of compound formed = ?

Solution:

 The reaction equation is given as;

          A   +   B   →  AB

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".

Simply mas is conserved and the mass of the reactants is the same as the mass of the product that forms.

  Mass of reactants  = mass of A + mass of B = 18g + 4g  = 22g

 So;

  Mass of product AB = 22g

Answer: C. There is more plate movement in California.

Explanation:

Answer:

When the magma reaches it boiling point and it starts to rise

Explanation:

Answer:

Mexico

Explanation:

external migration means move to a different country

Answer:

42.4m

Explanation:

Given parameters:

Speed of the fish = 0.8m/s

Distance  = 34m

Unknown:

Time taken for the fish to swim = ?

Solution:

Speed is the distance divided by the time taken;

     Speed  = [tex]\frac{distance}{time}[/tex]  

       Time  = [tex]\frac{distance}{speed}[/tex]  

Now, insert the parameters and solve;

        Time  = [tex]\frac{34}{0.8}[/tex]    = 42.4s

Gallium Nitrite your welcome

A binary III/V direct bandgap semiconductor called gallium nitride is ideally suited for high-power transistors that can function at high temperatures. It has been widely utilized in light-emitting diodes (LED) since the 1990s. Its chemical formula is Ga(NO₂)₃.

Blu-ray discs are read using a blue light that gallium nitride emits. Gallium nitride is also utilized in lasers, photonics, RF components, and semiconductor power devices. GaN will be used in sensor technology in the future.

Gallium nitride power amplifiers are perfect for microwave and terahertz (ThZ) devices, such as imaging and sensing, the aforementioned future market, due to their capacity to operate at significantly higher temperatures and voltages than gallium arsenide (GaAs) transistors.

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