Options are:
1. 4
2. 8
3. 2
4. 1

Answer:

a. 53.5 g/mol

b. 80.06 g/mol

c. 133.33 g/mol

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

a. NH₄Cl

b. NH₄NO₃

c. AlCl₃

Step 2: Find masses

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Al - 26.98 g/mol

Molar Mass of Cl - 35.45 g/mol

Step 3: Calculate compound masses

Molar Mass of NH₄Cl - 14.01 g/mol + 4(1.01 g/mol) + 35.45 g/mol = 53.5 g/mol

Molar Mass of NH₄NO₃ - 2(14.01 g/mol) + 4(1.01 g/mol) + 3(16.00 g/mol) = 80.06 g/mol

Molar Mass of AlCl₃ - 26.98 g/mol + 3(35.45 g/mol) = 133.33 g/mol

Explanation:

A = Golgi body

B = Vacuole

C = Mitochondrion

D = Nucleus

E = Cell membrane

Answer:

A = Golgi body

B = Vacuole

C = Mitochondrion

D = Nucleus

E = Cell membrane

Explanation:

give credit to the other person they helped me

too have a good day :)

Answer:

2. Hold it further from the ground

Explanation:

If I want to increase the potential energy of the tennis ball I am holding, it is best advised to hold the ball further from the ground.

Potential energy is the energy at rest in a body. It is dependent on the mass, gravity and height of body.

  Potential energy  = mass x gravity x height

Height is directly proportional to potential energy.

Answer:

There are required 6162J to raise the temperature of the piece of granite from 82°C to 212°C

Explanation:

By using the equation:

Q = m×C×ΔT

Where Q is heat in J, our incognite

m is mass of the substance, 0.0600kg = 60.0g

C is specific heat, 0.790J/g°C

And ΔT is change in temperature, 212°C - 82°C = 130°C

Replacing:

Q = m×C×ΔT

Q = 60.0g×0.790J/g°C×130°C

Q = 6162J

Answer:

hfjdjdjdjdjdjdjd

Explanation:

rjeiejejejeje

Answer:

b-acting as a standard unit of measure

Explanation:

Julie uses the mark for initially acting as a standard unit of measure. The correct option is b.

Recognizing and writing down an occurrence or fact is the process of observation, which frequently entails measuring it with tools. Utilizing tools for measurement is frequently required when recognizing and documenting an occurrence or fact. Written observations taken during or right after fieldwork are referred to as field notes.

They are essential for comprehending occurrences observed in the field. Scratch notes, diaries, and notebooks are common formats for field notes. The process of observation is essential in science. Snails are the molluscan. It comes under zoological study.

Therefore, the correct option is b. acting as a standard unit of measure

To learn more about observation, refer to the link:

https://brainly.com/question/2516642

#SPJ6

Answer:

6.941 moles

Explanation:

Answer:

25.9 g

Explanation:

Given that,

No of moles of calcium phosphate, [tex]n=9.3\times 10^{-2}[/tex]

We need to find how many grams of calcium phosphate has this much of no of moles.

Mass divided by molar mass is equal to the no of moles on a molecule.

The molar mass of calcium phosphate is 310.18 g/mol

Using the concept of no of moles as follows :

[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=9.3\times 10^{-2}\times 310.18\\\\m=28.84\ g[/tex]

Out of given options, option (a) i.e. 25.9 g is the correct answer.

Answer:Crystalline solids have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points. In contrast, amorphous solids have irregular or curved surfaces, do not give well-resolved x-ray diffraction patterns, and melt over a wide range of temperatures.

Explanation:

Answer:

:-::-::

Explanation:

Answer:

False

Explanation:

if this were true then water would not be available on earth other than in the atmosphere because of evaporation

Answer:

eek um A.The substance(s) to the left of the arrow in a chemical equation are called reactants.  The substance(s) to the right of the arrow is called products.

Explanation:

Answer:

pH = 2.75

Explanation:

Methanoic acid, HCOOH, is in acidic equilibrium:

HCOOH ⇄ HCOO⁻ + H⁺

And Ka is defined as:

Ka = 1.6x10⁻⁴ = [HCOO⁻] [H⁺] / [HCOOH]

As both HCOO⁻ and H⁺ ions comes from the same equilibrium, we can solve these concentrations assuming the HCOOH produce X of both HCOO⁻ and H⁺ ions:

1.6x10⁻⁴ = [HCOO⁻] [H⁺] / [HCOOH]

1.6x10⁻⁴ = [X] [X] / [0.02M]

3.2x10⁻⁶ = X²

X = 1.79x10⁻³M = [H⁺]

As pH = -log [H⁺]

The pH of the 0.02 M methanoic acid is 2.75 acid when the dissociation constant is [tex]1.6 \times 10^{-4} \rm \ M.[/tex]

At equilibrium, the dissociation of Methanoic acid,  

HCOOH ⇄ HCOO⁻ + H⁺

In the reaction, Methanoic acid dissociates to form HCOO⁻ and H⁺. So, the concentration of both products will be equal.

pH can be calculated by using Ka,

[tex]\bold{Ka = \dfrac {[HCOO^-] [H^+] }{[HCOOH]}}[/tex]

Where,

Ka - dissociation constant = 1.6x10⁻⁴

[HCOOH ] - concentration of Methanoic acid = 0.02 M

[tex]\bold{1.6 \times 10^{-4} M.= \dfrac {[HCOO^-] [H^+] }{[HCOOH]}}[/tex]

Let the concentration of each product is [tex]x[/tex]

So,

[tex]\bold{1.6 \times 10^{-4} \ M}= \dfrac {[x] [x] }{[0.02]}}\\x^2 = 3.2\times 10^{-6}\\x = 1.79\times 10^{-3}\rm \ M[/tex]

Put the value in the pH formula,

[tex]\bold {pH = - log [H^+]}\\\\\bold {pH =- log \ 1.79\times 10^{-3}\rm \ M}\\\\\bold {pH = 2.75 }[/tex]

Therefore, The pH of the 0.02 M methanoic acid is 2.75 acid when the dissociation constant is [tex]1.6 \times 10^{-4} \rm \ M.[/tex]

Learn more about dissociation constant:

https://brainly.com/question/7145687

Answer:

675 K

Explanation:

[tex]\dfrac{P_1V_1}{T_1}=0.03\ \text{atm L/K}[/tex]

Presión del sistema 2 = [tex]P_2=4.5\ \text{atm}[/tex]

Volumen del sistema 2 = [tex]V_2=4500\ \text{mL}=4.5\ \text{L}[/tex]

De la ley de los gases ideales tenemos la relación

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow 0.03=\dfrac{4.5\times 4.5}{T_2}\\\Rightarrow T_2=\dfrac{4.5\times 4.5}{0.03}\\\Rightarrow T_2=675\ \text{K}[/tex]

La temperatura del sistema para el segundo sistema es 675 K.

Answer:

1. Combine iron and copper (II) sulfate solution.  (Hint: Iron will form the iron (III) ion)

Fe + CuSO4 → FeSO4 + Cu

2. Combine lead (II) nitrate and potassium iodide solutions.

Pb(NO3)2+ Kl →  Pbl2 + 2KNO3

3. Combine magnesium metal and hydrochloric acid solution.

Mg + HCl → MgCl2 + H2

4. Electrolysis (splitting) of water.  

H2O → 2H2 + O2

5. Burning magnesium.

Mg + O2 → Mg2+O2-

Explanation:

Answer:

B = A/DH – C

Explanation:

From the question given above, we obtained:

A = D • H(B + C)

Thus, we can obtain B in terms of D, H, A and C by doing the following:

A = D • H(B + C)

A = DH(B + C)

Divide both side by DH

A/DH = B + C

Subtract C from both side

A/DH – C = B + C – C

A/DH – C = B

B = A/DH – C

Answer:

That would be a physical change

Explanation:

A physical change is when you are changing the physical properties of something but not changing its overall identity and a chemical change is when yo are changing the physical properties and changing its identity .

Ex. Ripping a dollar bill- Physical change

     Burning a dollar bill- chemical change

Answer:

first one is physical , second one is chemical

Explanation:

Answer:

Mass = 27.2 g

Explanation:

Given data:

Volume of gas = 22.7 L

Pressure of gas = 200.0 KPa (200/101=1.97 atm)

Temperature = 50.0°C

Mass of 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.

50+273 = 323K

1.97 atm ×22.7 L = n × 0.0821 atm.L/ mol.K  × 323K

44.72 atm.L = n × 26.52 atm.L/ mol

n =  44.72 atm.L / 26.52 atm.L/ mol

n = 1.7 mol

Mass of CH₄:

Mass =  number of moles × molar mass

Mass = 1.7 mol × 16 g/mol

Mass = 27.2 g

Answer:

B: Maintaining Homostasis

Explanation:

Answer:a and d

Explanation:

The properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.

Ionic solids are made up of ions joined together by ionic bonds. "Ionic bonding" is a type of chemical bond between a positive and a negatively charged ion where the transfer of electrons occurs.

They are too hard, and the ionic solids’ melting point is usually too high due to powerful forces between the anions and cations.

They are known as electrical insulators when they are in a solid-state. Apart from this, the molten salts do behave with electricity since the ions are not closed in the lattice.

Therefore, the properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.

Learn more about Ionic solids, here:

https://brainly.com/question/15241125

#SPJ2

Answer:

(2) never to be so irresponsible again

Explanation: hope this help!

Answer:

never to be so irresponsible again. is it right.

Answer:

This one here shows the proper use of parentheses>>>Ca(NO3)2

Answer:

Explanation:

The element CARBON enters the body in two NATURAL ways.

First is through eating and drinking. Almost all food that we eat contain the element carbon. As the ingested food reaches the digestive system, food is broken down into smaller pieces up until the molecular level. Some molecules are taken into the circulation, while others are excreted down as feces.

Second is by breathing. Certain air molecules contain carbon. One major air molecule is CARBON DIOXIDE. Some molecules are inhaled, but usually, CARBON DIOXIDE should be excreted from the body.

Unnatural ways when CARBON could enter the body is by medical intervention, as in intravenous injections, surgery, etc

Answer:

Sodium and chlorine combine to make salt

Explanation:

Answer:

vinegar and soda

Explanation:

:)

Answer:

I dont think so. If you continue to heat them up they will shrink and dissapper r become ashes. Thats a very interesting question btw. :) hope this helps!

Explanation:

Answer:

Al + 3NaOH  = Al(OH)₃ +3Na

Explanation:

The reaction is given as:

            Al + NaOH  = Al(OH)₃ + Na

This reaction is called a single displacement reaction in which one specie displaces another from a solution.

 To balance the equation:

                aAl + bNaOH  = cAl(OH)₃ + dNa

a, b, c and d are the coefficient that will balance the equation:

     Conserving Al;

                 a = c

     Conserving Na;

                b  = d

     Conserving O;

                 b  = 3c

     Conserving H;

                b = 3c

Let a  = 1, c = 1, b = 3 and d = 3

             Al + 3NaOH  = Al(OH)₃ +3Na

Answer:

2 ;)

Explanation: