In a undisturbed layer, how do we know which layer was deposited first ?

Answer:

A can-shaped component that moves smoothly up and down and is the main moving part

Explanation:

I chose the other answer that other person listed but got it wrong. This instead is the correct answer

Answer:

C.  A can-shaped component that moves smoothly up and down and is the main

moving part

Explanation:

The piston is a can-shaped component that can move smoothly up and down inside the cylinder; it moves up to compress the air-and-fuel mixture and is pushed down when the spark plug ignites the mixture, which causes an explosion.

Answer:

From left to right

Neutral

Acid

Base

Explanation:

So using HSAB theory hard and soft (Lewis) acids and bases.

OH - Is a Hard Base

H+ Strong Acid

Answer:

Which of the following are not examples of matter, well clouds are matter, gasoline is matter, ice is matter, so it would be light.

Answer:

A. H2P04

Explanation:

=molar mass( CaS )

= 40.08+32.07

=72.15 g mol-1

Answer:

72.143 g/mol

Explanation:

Answer:

1.65×10^-3 L or 1.65 mL

Explanation:

Number of moles of magnesium in the excess reagent= mass of excess reagent/ molar mass of magnesium

Mass of excess magnesium= 0.1594 g

Molar mass of magnesium= 24 gmol-1

Number of moles of magnesium= 0.1594/24 = 6.6×10^-3 moles

From the reaction equation;

1 mole of magnesium reacted with 2 moles of HCl

6.6×10^-3 moles of magnesium will react with 6.6×10^-3 moles × 2= 13.2×10^-3 moles of HCl

But we know that;

Number of moles of HCl= concentration of HCl × volume of HCl

Volume of HCl= number of moles of HCl/ concentration of HCl

Since concentration of HCl= 8.00M

Volume of HCl= 13.2×10^-3/8.00= 1.65×10^-3 L or 1.65 mL

Answer:

Explanation:

Calcium chloride reacts with NaOH to produce the Calcium hydroxide

CaCl2 + 2NaOH   ----> 2NaCl + Ca(OH)2

Answer:

Fractional distillation

Explanation:

Heat the mixture upto 700°C

The compuond with low boiling point will evaporate first and the compound with higher boiling point will evaporate last.

Answer: A)  0.20 L

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock [tex]H_2SO_4[/tex] solution = 10.0 M

[tex]V_1[/tex] = volume of stock [tex]H_2SO_4[/tex]   solution = ?

[tex]M_2[/tex] = molarity of dilute [tex]H_2SO_4[/tex]  solution = 0.50 M

[tex]V_2[/tex] = volume of dilute [tex]H_2SO_4[/tex]  solution = 4.0 L

[tex]10.0\times V_1=0.50\times 4.0[/tex]

[tex]V_1=0.20L[/tex]

Therefore, the volume of 10.0 M [tex]H_2SO_4[/tex] solution needed to prepare 4.0 L of 0.50 M [tex]H_2SO_4[/tex] is 0.20 L

Answer:

D. Weight

Explanation:

Answer:

Weight

Explanation:

Answer via Educere/ Founder's Education

Answer:

10.41 mL of concentrated 12 M HCl (aq) is needed to prepare a 250mL of 0.5 M HCl solution

Explanation:

Dilution is the procedure to prepare a less concentrated solution from a more concentrated one. The amount of solute does not vary, but the volume of the solvent varies. More solvent is added and the concentration of the solute decreases, as the volume of the solution increases.

In this case it is fulfilled:

Vi * Ci = Vf * Cf

Vi = initial volume

Ci = initial concentration

Vf = final volume

Cf = final concentration

Being:

Replacing:

Vi*12 M= 0.250 L* 0.5 M

Solving:

[tex]Vi=\frac{0.250 L*0.5 M}{12 M}[/tex]

Vi= 0.01041 L= 10.41 mL

10.41 mL of concentrated 12 M HCl (aq) is needed to prepare a 250mL of 0.5 M HCl solution

Answer:

Balance the equation

Fe3O4 + 4H2---> 3Fe +4H2O

Molar mass H2=(2*1)=2g/mol

Mass of H2=54.29grams

mole of H2= 54.29/2=27.15mol

4 mol of H2 = 1 mol Fe3O4

27.15mol of H2= 6.79mol of Fe3O4

Moles of Fe3O4 =6.79mol

Molar mass of Fe3O4= (56×3)+(16×4)

=168+64=232g/mol

Grams of Fe3O4 required to react with 54.29 grams of H2 is 232g/mol× 6.79mol

=1575.28g

Answer: 1 mole of any gas has a volume of 22.4 L at STP

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1 atm (at STP)

V = Volume of gas = ?

n = number of moles = 1

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]273K[/tex]  (at STP)

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{1mol\times 0.0820 L atm/K mol\times 273K}{1atm}=22.4L[/tex]

Thus 1 mole of every gas occupies 22.4 L at STP

Answer:

1 mole of any gas has a volume of 22.4 L at STP

Explanation:

ap3xx

Answer:

the answer is convection

convection

Answer:

Not sure what the answer is

Explanation:

I did this a while ago and dont remember sorry

Answer:

Solid, Liquid, and Gas

Explanation:

There are constantly these three phases of matter around us every day. The water you drink is a liquid, the chair you sit on is a solid, and the air you breathe is a gas.

Answer:

Base

Explanation:

Acid + Base ⇒ Salt + Water (Neutralization Reaction)

So the substances forming salt and water must be acid and base.

Since HCl is acid so the Metal Oxide would be the base.

Answer:

4.38 Grams of C

Explanation:

How many grams of C are required to react with 52.6grams of Fe2O2?

Fe2O2 + C = 2Fe + CO2

Ratio 1:1

Fe2O2 = 144 Molar Mass

Fe2O2 52.6/144 = 0.365Moles of Fe2O2

Fe =56grams/mole =  Charge 2+, 3+

O = 16grams/mole = Charge 2-

C = 12grams/mole = Charge 4+

So Ratio is 1:1 so we only need 0.365Moles of C so 4.38grams

Answer:

N = -3

H = +1

O = -2

Cl = +1

Explanation:

The balanced Equation of the reaction above is:

NH3 + 3HOCl ----> NCl3 + 3H2O

Where NH3 is ammonia;

HOCl is Oxochlorate (I) acid

NCl3 is nitrogen trichloride

H2O is water

Nitrogen in both Ammonia and Nitrogen trichloride has an oxidation state of -3. It shares three electrons with each of the three atoms of hydrogen and chlorine

Hydrogen in both Oxochlorate (I) acid and in water has an oxidation state of +1. Each atom shares an election with oxyen in both compounds.

Oxygen in both Oxochlorate (I) acid and water has an oxidation state of -2. Each atom shares two electrons with neighboring atoms; in HOCl, it shares with chlorine and hydrogen, while in H2O, it shares with two atoms of hydrogen.

Chlorine in both Oxochlorate (i) acid and Nitrogen trichloride has an oxidation state of +1. It shares an electron with each of it's neighboring bonded atoms.

Answer:

Explanation:

write down the formulas, use the expressions and formulas to convert

Answer:

c) An element is made up of all the same type of atom

Explanation:

Atoms are the smallest unit of an element that consists of protons, electrons and neutrons in its structure. An element is the smallest part of a chemical substance that cannot be disintegrated i.e. it cannot be broken down further.

Atoms and elements are different in many ways but they are connected in the sense that an element contains only one type of atoms. For example, aluminum element is made up of only aluminum atoms. Different atoms form a molecule but same atoms form an element.

The difference of the element and iron should be option c) An element is made up of all the same type of atom.

The atom represents the smallest unit that comprises of protons, electrons, etc.

While on the other hand, the element represents the small part of the chemical substance that should not be disintegrated. Also, it cannot be split. They both should be interlinked.

Therefore, the option c is correct.

Learn more about an atom here: https://brainly.com/question/15893771

Answer:

[tex]\large \boxed{\text{528.7 g} }[/tex]

Explanation:

It often helps to write the heat as if it were a reactant or a product in the thermochemical equation.

Then you can consider it to be 11018 "moles" of "kJ"  

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

M_r:                      32.00

              2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 8H₂O + 11 018 kJ

n/mol:                                                                  7280

1. Moles of O₂

The molar ratio is 25 mol O₂:11 018 kJ

[tex]\text{Moles of O}_{2} = \text{7280 kJ} \times \dfrac{\text{25 mol O}_{2}}{\text{11 018 kJ}} = \text{16.52 mol O}_{2}[/tex]

2. Mass of O₂

[tex]\text{Mass of C$_{8}$H}_{18} = \text{16.52 mol O}_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \textbf{528.6 g O}_{2}\\\text{The reaction requires $\large \boxed{\textbf{528.67 g O}_{2}}$}[/tex]

Answer:

180 p

Explanation:

Energy refers to the capacity of doing work.

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

[tex]500W=\frac{500}{1000}kW=0.5\,kW[/tex]

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = [tex]15\times 0.5=7.5\,p[/tex]

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = [tex]7.5\times 24=180\,p[/tex]

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

[tex]500W=\frac{500}{1000}kW=0.5\,kW[/tex]

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = [tex]15\times 0.5=7.5\,p[/tex]

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = [tex]7.5\times 24=180\,p[/tex]

Answer:

Salt (NaCl) is an ionic bond that consists of Sodium (Na) which is a metal with positive charge combines with Chlorine (Cl), a nonmetal with a negative charge.

Explanation: