The atomic mass of iron is 55.85, and oxygen is 16.0. What is the mass of 6.02 × 1023 molecules of Fe2O3?

Answer:

The first one has 5 valence electrons, and the second has 7. (This can be counted by counting the amount of black dots on the biggest circle). Since 7 > 5, it would be easier for the second one to gain one (so that it completes it's valence shell) so the answer is the second one.

Answer:

1.20 L = 1200 mL

Explanation:

P1V1/T1 = P2V2/T2

V2 = P1*V1*T2/(T1*P2)

V1 = 700ml =0.700 L

P1 = 106.6 kPa

T1 = 7+273.15 = 280.15 K

T2 = 27 + 273.15 = 300.15 K

P2 = 66.6 kPa

V2 = 106.6*0.700*300.15/(280.15*66.6)= 1.20 L=1200 mL

Answer:

[tex]T_i~=163.1[/tex] ºC

Explanation:

We have to start with the variables of the problem:

Mass of water = 60 g

Mass of gold = 13.5 g

Initial temperature of water= 19 ºC

Final temperature of water= 20 ºC

Initial temperature of gold= Unknow

Final temperature of gold= 20 ºC

Specific heat of gold = 0.13J/gºC

Specific heat of water = 4.186 J/g°C

Now if we remember the heat equation:

[tex]Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT[/tex]

[tex]Q_A_u=m_A_u*Cp_A_u*deltaT[/tex]

We can relate these equations if we take into account that all heat of gold is transfer to the water, so:

[tex]m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT[/tex]

Now we can put the values into the equation:

[tex]60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)[/tex]

Now we can solve for the initial temperature of gold, so:

[tex]T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20[/tex]

[tex]T_i~=163.1[/tex] ºC

I hope it helps!

Taking into account the definition of calorimetry,  the initial temperature of the gold metal sample is 163.36 °C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For gold: Qgold= 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)

For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qgold = + Qwater

- 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)

Solving:

- 1.755 [tex]\frac{J}{C}[/tex]× (20 C - Initial temperature of gold)= 251.16 J

- 1.755 [tex]\frac{J}{C}[/tex]× 20 C - (- 1.755 [tex]\frac{J}{C}[/tex])× Initial temperature of gold= 251.16 J

- 35.1 J +1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J

1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J + 35.1 J

1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold=286.7 J

Initial temperature of gold=286.7 J÷ 1.755 [tex]\frac{J}{C}[/tex]

Initial temperature of gold= 163.36 °C

Finally, the initial temperature of the gold metal sample is 163.36 °C.

Learn more:

Answer: C. 3

Explanation: 3 is the lowest energy level that contains d orbitals.

Answer

let the oxidation of sulphur is x

2(+1)+x+4(-2)=0

+2+x-8=0

+2-8+x=0

-6+x=0

x=6

Explanation:

i hope this will help you:)

Answer:

20L

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 10L

Initial Temperature (T1) = stp = 273K

Final temperature (T2) = 546K

Final volume (V2) =..?

The new volume of the gas can be obtained by using the Charles' law equation as shown below:

V1/T1 = V2/T2

10/273 = V2/546

Cross multiply to express in linear form

273 x V2 = 10 x 546

Divide both side by 273

V2 = (10 x 546) / 273

V2 = 20L

Therefore, the new volume of the gas is 20L.

Answer:

Lots of bad things would happen

Explanation:

People would lose their jobs

People would fall out of contact (no phones)

It would be pretty dark (no streetlights)

You would have to learn everything by book or asking someone

ect.

Answer: My life would change drastically.

Explanation:

This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.

The  source of chemical energy from wood can be renewed as wood can constantly obtain chemical energy from the sun as it is a renewable source of energy.

Energy which is stored in the chemical bonds of chemical compounds is called chemical energy.Chemical energy is released during the occurrence of chemical reaction.Reactions wherein energy is given out in the form of heat is called exothermic reactions.

Chemical energy can be converted to other forms of energy like electrical energy during the process of electrolysis and to thermal energy as in the case of thermal engines.

It can also be converted to kinetic energy during explosions . It is stored in batteries, coal, biomass, food, vehicle air bags,etc.Chemical energy of plants is utilizes during the process of photosynthesis.

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Answer:

It is..  To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.

They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.

Explanation:

The paragraph that indicates the relationship between public support and the enforcement of environmental policies are:

C. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.

D. They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.

Environmental policies are the policies made by the government to save the environment and animals from hunters, and predators. Environmental policies include preventive areas and rules for humans to behave in natural resources.

Thus, the correct options are C and D.

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Answer:

487 moles of CO2 is needed

Explanation:

What we need to use here is the ideal gas equation.

Mathematically;

PV = nRT

Since we are calculating the number of moles, we can rewrite the equation to be;

n = PV/RT

from the question, we identify the following;

P is the pressure at 150 atm

V is the volume at 80L

T is the temperature which is 27+273 = 300K

R is the molar gas constant which is 0.0821 L atm K^-1 mol^-1

Substituting these values, we have;

n = (150 * 80)/(0.0821 * 300) = 487.2 which is approximately 487 moles

Answer:

A. 8

Explanation:

8 valence electrons means you have a full shell.

Answer:

0.74M

Explanation:

Step 1 :

Data obtained from the question.

Initial concentration (C1) = 3M

Initial volume (V2) = 185mL

Final volume (V2) = 750mL

Final concentration (C2) =..?

Step 2:

Determination of the new concentration of the solution.

The new concentration of the solution can be obtained by using the dilution formula as shown below:

C1V1 = C2V2

3 x 185 = C2 x 750

Divide both side by 750

C2 = 3 x 185 / 750

C2 = 0.74M

Therefore, the new concentration of the solution is 0.74M

Explanation:

47.0g is the mass of ammonia

Answer:

this is an answer to your question in explanation

Explanation:

Weather is the atmospheric conditions, including the temperature, wind, snow, rain, or anything else happening outside

season is one of the four division in a calendar year

Climate is the longstanding average weather of an area.

Weather, state of the atmosphere at a particular place during a short period of time.

A season is a division of the year marked by changes in weather, ecology, and the amount of daylight.

Climate is defined as an area's long-term weather patterns.

Explanation:

When the water evaporates from your clothes, it will "hang around" around it. If there is little or no air movement, this means that the air surrounding the fabric is saturated with moisture, which means it will not evaporate more. The breeze will move the moisture-saturated air away from the fabric, until more water evaporates.

Answer:

Option A. 4mol/0.800Kg

Explanation:

Data obtained from the question include:

Mole of solute = 4 moles

Mass of water = 0.800Kg

Molality =.?

Molality of a solution is simply defined as the mole of solute per unit kilogram of solvent. Mathematically, it is expressed as:

Molarity = mole of solute / Kg of solvent

With the above formula, we can obtain the molality of KCl solution as follow:

Molality = 4mol/0.800Kg

Answer: A

Explanation:

Answer: Free energy combined enthalpy and entropy into a single value. Gibbs’s free energy is the energy associated with a chemical reaction that can do useful work. It equals the enthalpy minus the product of temperature and entropy of the system.

Explanation:

Answer: Sodium Hydroxide (NaOH)

Explanation: Sodium Hydroxide also known as Cautious Soda is a compound comprising of Sodium cations and Hydroxide anions.

It is white and in form of opaque crystals.

It is anhydrous and completely soluble in water.

It is also a Hygroscopic compound which explains its absorption of water from the air.

Sodium Hydroxide is also formed by a chlor alkali process which is an industrial processes used for the electrolysis of sodium chloride solutions.

This process produces sodium hydroxide and chlorine.

See simple equation below;

2NaCl + H2O ---> 2NaOH + Cl2

Answer:

Organic compounds

Explanation:

I just did this question and apparently it’s that. (:

The correct answer is organic compounds.

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Explanation:

A neutralization is a type of double replacement reaction. a salt is the product of an acid-base reaction and is a much broader term then common table salt.

Example:-

(i) HCl + NaOH ---> NaCl + HOH

(ii) H2SO4 + 2NH4OH ---> (NH4)2SO4 + 2HOH.

A neutralization reaction is a type of reaction where the water and the salt are produced from the reaction of the base and the acid, and two examples are the hydrochloric acid and sodium hydroxide combination and the reaction of nitric acid and calcium hydroxide.

It is significant because it is very useful in the determination of the concentration of an acid or base in a solution and is also important in industrial applications and biological processes, such as the production of fertilizers and the digestion of food in the stomach.

Hence, a neutralization reaction is a type of reaction where the water and the salt are produced from the reaction of the base and the acid, and two examples are the hydrochloric acid and sodium hydroxide combination and the reaction of nitric acid and calcium hydroxide.

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Answer:

Pressure initially is 760 torr.

Temperature is at 273.15

Temperature is increased to 298.15

Pressure increases by a factor of 298.15 / 273.15 = 1.0915248032

760 * 1.0915248032  = 829.558850432  torr

Explanation:

Which element would you expect to behave the most like carbon ( C ) ?

● A. Germanium (Ge) ✔

O B. Phosphorus (P)

O C. Nitrogen (N)

O D. Oxygen (0)

The statement for the element would expect to behave the most like carbon (C) is "Germanium (Ge)."

An element is a substance that cannot be divided into smaller components through normal chemical processes. All matter is composed of elements, which are the basic building blocks.

Carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (F) are the six chemical elements that make up Group 14 (IVa) of the periodic table (Fl). That is, germanium and carbon belong to the same family.

Therefore, Germanium (Ge) element expect to behave the most like carbon (C).

Hence the correct answer is A.

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Answer:

Na (Sodium)

Explanation:

Sodium is a metal, and when combined with Chlorine (which is a non-metal) it creates an ionic compound

Option C is correct. The Sodium combined with Chlorine to form an ionic compound.

Ionic Compound:

These are the compounds that are made up of two ions, one positive and one negative. In the solution, they conduct electricity. They formed when a metal interacts with a non-metal.

For example- NaCl

Therefore, the Sodium combined with Chlorine to form a an ionic compound.

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Answer:

The answer is Diffusion.

Explanation:

Diffusion is a movement of molecules(substances) from a region of high concentration to a region of low concentration down a concentration gradient.

Answer:

Active

Explanation:

During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy.

Answer:

element and compound.

Explanation:

reason

an element is a pure substance that cannot be broken down into simpler substances by any ordinary physical or chemical process.

and compound is a pure substance that consists of two or more elements held together in fixed proportions by natural forces called chemical bonds.

homogeneos and heterogenous mixtures are considered impure substances because they dont have a definite composition.

In chemistry, pure substances have been defined by matter that has characteristic properties. An element and compound are pure substances. Thus, options 1, and 2 are correct.

Pure substances have been the matter that is characterized by the presence of a fixed chemical composition that cannot be physically separated by the processes like filtration, evaporation, etc.

Elements and compounds are pure substances as elements are not broken physically or chemically to form simple -small substances like zinc. Furthermore, compounds are formed by the combination of pure substances like water.

Homogeneous mixtures and heterogeneous mixtures are not pure substances as they lack fixed ratios and proportions that cannot be said to have definite composition.

Therefore, options 1 and 2. are elements and compounds are pure substances.

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Answer:

Forumula

XOH + HY = XY + H2O

Explanation:

Salt formed from: Salt Solution

Strong acid + Strong base Neutral

Strong acid + Weak base Acidic

Weak acid + Strong base Basic

Neutral solution example

NaCl = Sodium chloride

HCl = H+ and Cl-

NaOH = Na+ and OH-

OH- = Strong Base

H+ = Strong Acid

Sodium chloride, formed from neutralization of HCl by NaOH.

NaOH + HCl = NaCl + H2O

NaCl in water is not acidic or basic, since it's ions cannot hydrolyze.

So formula would be XOH + YH = XY + H2O

Answer:

0.040M

Explanation:

The following data were obtained from the question:

Volume of acid (Va) = 150mL

Volume of base (Vb) = 60mL

Molarity of base (Mb) = 0.1M

Molarity of acid (Ma) =..?

Next, the balanced equation for the reaction. This is given below:

HCl + NaOH —> NaCl + H2O

From the balanced equation above,

The mole ratio of the acid (nA) = 1

The mole ratio of the base (nB) = 1

Finally, we shall determine the concentration of the acid, HCl as follow:

MaVa / MbVb = nA/nB

Ma x 150 / 0.1 x 60 = 1/1

Cross multiply to express in linear form

Ma x 150 = 0.1 x 60

Divide both side by 150

Ma = 0.1 x 60 / 150

Ma = 0.04M

Therefore, the concentration of the acid is 0.04M

Answer:

0.040M

Explanation:

just took the review