Help me on this question esplain

Answer:

True

Explanation:

Answer:

4.15 M

Explanation:

In order to find the molarity of a stock solution of Z, we use the formula;

Co = 10pd/M

where;

p = percentage by mass of Z

d = density of Z

M= molar mass of Z

Substituting values;

Co= 10 * 35 * 1.4/118

C0= 4.15 M

Answer:

Avogadro's number is 6.022×1023 molecules. With Avogadro's number, scientists can discuss and compare very large numbers, which is useful because substances in everyday quantities contain very large numbers of atoms and molecules.

please mark Brainliest if it helps!

Answer:

0.04 moles

Explanation:

Given data:

Mass of Fe = 2.30 g

Moles of FeCl₃ produced = ?

Solution:

Chemical equation:

2Fe + 3Cl₂         →     2FeCl₃

Number of moles Fe:

Number of moles = mass/molar mass

Number of moles = 2.30 g/ 55.85 g/mol

Number of moles = 0.04 mol

now we will compare the moles of iron and iron chloride.

             Fe            :           FeCl₃

              2            :              2

            0.04        :           0.04

Thus, 0.04 moles of iron chloride are produced.

The number of moles that could be produced is 0.04 moles

Chemical equation:

2Fe + 3Cl₂         →     2FeCl₃

Number of moles Fe:

It should be

[tex]= mass\div molar mass\\ = 2.30 g\div 55.85 g/mol [/tex]

= 0.04 mol

Learn more: https://brainly.com/question/2514933?referrer=searchResults

Answer:

Covalent compounds have low forces of attraction between their molecules (i.e. one H2O molecule isn't as attracted to another H2O molecule than the oppositely charges ions are in an ionic compound). Little energy is needed to break their bonds, therefore they have low meting points. Hope this is what you are looking for!

Explanation:

Brainliest please?

Answer: the answer would be A

Explanation:

Answer:

A

Explanation:

Answer:

the first oneeeee

Explanation:

this i because it impacts as in change

Answer: When converting from Scientific Notation to a standard or normal notation, use the value of the exponent to determine the number of places to move the decimal point. Move the decimal place to the right if the exponent is positive and move the decimal place to the left if the exponent is negative.

Explanation: I got this from a website but I still hope it helps!

Answer: if i were to convert a Scientific notation and it was 5.1³ then i would move the decimal point 3 times making it 5100 but if it were some thing like 5.123² you'd move the decimal 2 pts. making 512.3

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.67 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 9.418604...[/tex]

We have the final answer as

Hope this helps you

Answer:

P = 1361.17 KPa

Explanation:

Given data:

Mass of sample = 3.0 mol

Pressure of sample = ?

Volume of gas = 5.0 L

Temperature of gas = 0°C

Solution:

Pressure of gas:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 8.31 KPa.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

0+273 = 273 K

by putting values,

P × 5.0 L = 3.0 mol × 8.31 KPa.L/ mol.K  × 273 K

P = 6805.89 KPa.L/ 5.0 L

P = 1361.17 KPa

Answer:

Explanation:

The effect of azeotrope system is that , a positive azeotrope system boils at lower temperature than the other liquid constituents. It is also refer to as minimum temperature.

A negative azeotrope system boils at high temperature than other liquid constituents.

A azeotrope mixure refer to mixture of liquid with constant boiling point.

Answer:

the emission or transmission of energy in the form of waves or particles through space or through a material medium.

Answer:

NCl₃ + 2 H₂O = HNO₂ + 3 HCl

Explanation:

Let's consider the unbalanced equation showing the reaction between nitrogen trichloride and water to form nitrous acid and hydrochloric acid.

NCl₃ + H₂O = HNO₂ + HCl

We start balancing Cl atoms by multiplying HCl by 3.

NCl₃ + H₂O = HNO₂ + 3 HCl

Then, we balance O atoms by multiplying H₂O by 2.

NCl₃ + 2 H₂O = HNO₂ + 3 HCl

The equation is now balanced.

Answer:

Perrous magnets

Explanation:

Explanation:

Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.

Answer:

1.5 g

Explanation:

Step 1: Given data

Step 2: Calculate the required moles (n) of NaCl

We will use the following expression.

n = C × V

n = 0.10 mol/L × 0.25000 L

n = 0.025 mol

Step 3: Calculate the mass (m) corresponding to 0.025 moles of NaCl

We will use the following expression.

m = n × M

m = 0.025 mol ×58.44 g/mol

m = 1.5 g

Answer:

C and D

Explanation:

IF CORRECT PLEASE GIVE ME BRAINLLEST!!!!!!!!!!

IF NOT PLEASE TELL ME, AND IF YOU KNOW, WHY!!!!!!

THANKS!!!!!!!!!!!

◑﹏◐:-)O_o(○’ω’○)∩﹏∩↖(^ω^)↗o_O(ToT)^O^囧rzB-)

Answer:

The above answer is right C and D

Explanation:

its not A becuase half the earht is dark at night

its bot b because the poles are cold and light is not directly shning on them

it IS c because the light is on and close to the equator and not the pole.

it IS D because a pole is a high altitude that gets less sunlight

Answer: it ISNT occurs in substances that have discrete molecular structure

Explanation:

I took the test

The characteristics that can be written only in space B is they occur in substances that have at least one non-metal. The correct option is A.

Ionic bonds are formed when two electrically charged elements shred their charged ions.  Covalent bonds are formed when there is a mutual sharing of electrons between the atoms.

One condition that is similar in both is both bonds needed one non-metal to form the bond.

Thus, the correct option is A, which occurs in substances that have at least one non-metal.

Learn more about the ionic and covalent bonds, here:

https://brainly.com/question/12663276

#SPJ2

Answer:

t

Explanation:

Answer:

a. 3.79e5 J

b. Decrease.

Explanation:

Hello!

a. In this case, since the heat involved during a compression-expansion isothermal process is computed via:

[tex]Q=nRTln(\frac{V_2}{V_1} )[/tex]

Now, since the final volume is one third of the initial one:

[tex]V_2=\frac{V_1}{3}[/tex]

So we can plug in now:

[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{\frac{V_1}{3} }{V_1} )\\\\Q=-3.79x10^5J[/tex]

b. In this case, the relationship between initial and final volume is:

[tex]V_2=2.2V_1[/tex]

So the heat interaction is now:

[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{2.2V_1 }{V_1} )\\\\Q=2.72x10^5J[/tex]

It means that the heat interaction decrease on the contrary process, it means that in a. heat was released by 3.79e5 J and in b heat is absorbed by 2.72e5 J.

Best regards!

Answer:

c. N, P, and As can sometimes share more than 8 e-

Explanation:

Lewis structures are diagrams that show the valence electrons of atoms within a molecule. Valence electrons play a major role while drawing Lewis structures as only valence electrons can be shared with another molecule to form a bond.

N, P, and As can not share more than 8 e- because they have less valence electrons in their outer shell. N has only one valence electron, P and As has only 5 valence electrons so they can not share more than their valence electrons.

Hence, the correct answer is "c. N, P, and As can sometimes share more than 8 e-".

Answer:

1st box:4

2nd box:2

3rd box:3

4th box:1

Explanation:

I am not 100% sure on this, but i am pretty confident that this is the answer! BUT If this is somehow wrong, please tell me so i can comment a better answer! :)

Due to property of conduction, conductor allows electrons and electric current to move easily,insulators prevent electric current from moving, electric current is the  flow of an electrical charge in a circuit and electric circuit provides a path for electrons to flow​.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

Learn more about conduction,here:

https://brainly.com/question/12136944

#SPJ5

Answer:

47 is your correct ans, which is b

Answer:

Electrical

Explanation: