Help please science questions
It’s for 20 points

Answer:

The reaction will proceed to the right and produce more products.

Explanation:

The reaction produces heat, so it is exothermic. If you remove heat, the reaction counters that by producing more products and replacing the heat that was lost.

Answer:

Iron Oxide (Fe2O3) also known as rust is also an ionic bond, it has metallic compound Iron (Fe) which contains positively charged cations and it has nonmetallic compound Oxygen (O) which contains negatively charged anions.

Explanation:

i hope it help

Answer:

-252.5 kJ/mol = ΔH H2O(g)

Explanation:

ΔH Fe2O3 = -825.5kJ/mol

ΔH H2 = 0kJ/mol

ΔH Fe = 0kJ/mol

Based on Hess's law, ΔH of a reaction is the sum of ΔH of products - ΔH of reactants. For the reaction:

Fe2O3(s) + 3 H2(g) →2Fe(s) + 3 H2O(g)

ΔHr = 67.9kJ/mol = 3*ΔH H2O + 2*ΔHFe - (ΔH Fe2O3 + 3*Δ H2)

67.9kJ/mol = 3*ΔH H2O + 2*0kJ/mol - (ΔH -825.5kJ/mol + 3*Δ H2)

67.9 = 3*ΔH H2O(g) + 825.5kJ/mol

-757.6kJ/mol = 3*ΔH H2O(g)

Answer:

When the metal reacts with hot, concentrated sulphuric acid, the products of the reaction are copper (II) sulphate, sulphur dioxide and water. Cu + 2H2SO4 = CuSO4 + SO2 + 2H2O. This is a typical redox reaction in which the acid is reduced to SO2, but no hydrogen is produced here

Answer:

the percent error is -13.5%  

Explanation:

Given the data in the question;

Exact atomic weight = 65.38 g/mol

For approx

increased mass = 0.3681 g

moles = 6.514 x 10⁻³

we know that; moles = mass / (Atomic mass )

so

Atomic mass_[tex]_{approx[/tex] = mass / moles

Atomic mass_[tex]_{approx[/tex]  = 0.3681 / 6.514 x 10⁻³

Atomic mass_[tex]_{approx[/tex]  = 56.509

so approx atomic weight = 56.51 g/mol

we know that;

% error = ( [approx - exact] / exact ) × 100

we substitute

% error = ( [56.51 - 65.38]  / 65.38 ) × 100

% error = (-8.87 / 65.38 ) × 100

% error = ( -0.1356684 ) × 100  

% error = -13.5%  

Therefore, the percent error is -13.5%  

Answer:

ΔH°r = -114.40 kJ

Explanation:

Let's consider the following balanced equation.

4 HCl(g) + O₂(g) ⇒ 2 H₂O(g) + 2 Cl₂(g)

We can calculate the standard enthalpy change of the reaction (ΔH°r) using the following expression.

ΔH°r = ∑np × ΔH°f(p) - ∑nr × ΔH°f(r)

where

ΔH°r = 2 mol × ΔH°f(H₂O(g)) + 2 mol × ΔH°f(Cl₂(g)) - 4 mol × ΔH°f(HCl(g)) - 1 mol × ΔH°f(O₂(g))

ΔH°r = 2 mol × (-241.82 kJ/mol) + 2 mol × 0 kJ/mol - 4 mol × (-92.31 kJ/mol) - 1 mol × 0 kJ/mol

ΔH°r = -114.40 kJ

Answer:

0.668 atm

Explanation:

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

Initial pressure (P₁) = 0.715 atm

Initial temperature (T₁) = 30 °C

Final temperature (T₂) = 10 °C

Volume = constant

Final pressure (P₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 30 °C

Initial temperature (T₁) = 30 °C + 273

Initial temperature (T₁) = 303 K

Final temperature (T₂) = 10 °C

Final temperature (T₂) = 10 °C + 273

Final temperature (T₂) = 283 K

Finally, we shall determine the final. This can be obtained as follow:

Initial pressure (P₁) = 0.715 atm

Initial temperature (T₁) = 303 K

Final temperature (T₂) = 283 K

Final pressure (P₂) =?

P₁ / T₁ = P₂ / T₂

0.715 / 303 = P₂ / 283

Cross multiply

303 × P₂ = 0.715 × 283

303 × P₂ = 202.345

Divide both side by 303

P₂ = 202.345 / 303

P₂ = 0.668 atm

Thus, the final pressure of the hot air balloon is 0.668 atm

Answer:

[Sr(OH)₂] = 0.699 M  in Sr(OH)₂ sol'n  (1 sig. fig)  

Explanation:

Concentrated-1 Sr(OH)₂ = M₁ = unknown  Concentration-2 HCl = M₂ = 0.350M          

Volume of Concentrate = V₁ = 15ml           Volume of Diluted = V₂ = 29.8ml

Using the Dilution Equation

Molarity  x  Volume of Concnt'd Soln = Molarity x Volume of Diluted Soln

From definition of molarity (M) = moles solute / volume of solution in Liters

=> moles solute = Molarity x Volume in liters*

*Note: if volume units are the same on both sides of the dilution equation then one may retain the volume in ml.

M₁ x V₁ = M₂ x V₂      

=> 15ml ·  [Sr(OH)₂] = 30ml X 0.350M HCl soln  

=>  [Sr(OH)₂] = 29.8ml X 0.350M / 15ml = 0.695333... (calculator answer)

=> [Sr(OH)₂] = 0.7 M  in Sr(OH)₂ sol'n  (1 sig. fig)  

__________________________________

work check:

M₁ x V₁ = M₂ x V₂

0.6953M x 15ml = 0.35M x 29.8ml

10.43 moles = 10.43 moles                    QED

Answer:

[Ar] 4s2

Explanation:

The noble gas that comes before Ca is Ar, so that's what you'll use for the noble-gas shorthand part of it. Ca has two additional electrons in the 4s orbital, hence the 4s2.

The ground state electronic configuration of calcium using noble gas short hand notation is [Ar]4s².

Noble gas short hand notation comprises of the symbol of the last noble gas which is prior to the concerned atom which is followed by the configuration of the electrons which remains.

This notation helps in shortening of electronic configuration which is otherwise huge for elements with high atomic numbers.This is possible cause it uses the preceding noble gas configuration which accounts for that many electrons and the remaining electrons are filled in the next higher sub shell.

For calcium, preceding noble gas is argon which accounts for 18 electrons and for remaining two electrons they are placed in 4s sub shell thus making the total count of electrons to 20.

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Answer:

It is the closest sir.

Have an amazing day and enjoy. P.S Good luck!

Explanation:

Let's chek the orders where mercury and rest planets present

Mercury is closest to sun so gravitational force is most

Explanation:

Hope the picture with the working out helps :)

Answer:

whatttttttttttttttt do you meam

Answer: a) [tex]Ba(NO_3)_2(aq)+(NH_4)_2SO_4(aq)\rightarrow BaSO_4(s)+2NH_4NO_3(aq)[/tex]

b) [tex]CoCl_3(aq)+3NaOH(aq)\rightarrow Co(OH)_3(s)+3NaCl(aq)[/tex]

c) [tex]2FeCl_3(aq)+3(NH_4)_2S(aq)\rightarrow Fe_2S_3(s)+6NH_4Cl(aq)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.

The balanced chemical equations are:

a) [tex]Ba(NO_3)_2(aq)+(NH_4)_2SO_4(aq)\rightarrow BaSO_4(s)+2NH_4NO_3(aq)[/tex]

b) [tex]CoCl_3(aq)+3NaOH(aq)\rightarrow Co(OH)_3(s)+3NaCl(aq)[/tex]

c) [tex]2FeCl_3(aq)+3(NH_4)_2S(aq)\rightarrow Fe_2S_3(s)+6NH_4Cl(aq)[/tex]

Answer:

liquid (s), gas (m)

Explanation:

In gas chromatography, the phase of stationary would be made of great molecular weight that have non-volatile coated on the packed i.e. inside a column also the mobile phase represent the inert gas that carries the components that should be volatilized.

Now the physical form and the mobile phase is the liquid and the gas

The same would be relevant and considered too

Answer:

To tell if a chemical reaction has occurred look at its color change, temperature change, Precipitate formation, gas production, and light emission.

Answer:

The entropy increases!!!

Explanation:

a pex

The entropy increases in the reaction.

The entropy increases in the reaction if the total number of product molecules are greater than the total number of reactant molecules.

2C3H6(g) + 9O2(g) → 6C02(g) + 6H2O (g)

In the above reaction, the product molecules are greater than the reactant molecules. Hence, entropy increases.

Hence, we can conclude that option A is the answer.

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Answer:

c

Explanation:

Involuntary muscles, like skeletal muscles, help move the bones

Answer:

the second and last one is correct

since bones protect our internal organs like heart, pancreas,etc and give the body its shape

Explanation:

second point it is true that in our body there are more than 600 muscles and the bones are about 206 I think

Answer: 0.056

Explanation:

The molarity of the solution is the ratio of the number moles of solute to the volume of solution. Hence, the molarity of the given solution is 0.056 M. Thus, option D is correct.

Molarity is a common term used to express the concentration of a solution . It is the ratio of the number of moles of solute to the volume of solution in liters.

Given that,

volume of HCl solution  = 9 L

no. of moles of HCl = 0.50 moles.

Then,

molarity = no.of moles/volume in L

M = 0.50 Moles/9 L

   = 0.056 M.

Therefore, the molarity of the solution is 0.056 M.

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Answer:

29.47 g of AlCl₃.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2Al + 3Cl₂ —> 2AlCl₃

Next, we shall determine the mass of Al that reacted and the mass of AlCl₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of Al = 27 g/mol

Mass of Al from the balanced equation = 2 × 27 = 54 g

Molar mass of AlCl₃ = 27 + (35.5× 3)

= 27 + 106.5

= 133.5 g/mol

Mass of AlCl₃ from the balanced equation = 2 × 133.5 = 267 g

SUMMARY:

From the balanced equation above,

54 g of Al reacted to produce 267 g of AlCl₃.

Finally, we shall determine the mass of AlCl₃ produced by the reaction of 5.96 g of Al. This can be obtained as follow:

From the balanced equation above,

54 g of Al reacted to produce 267 g of AlCl₃.

Therefore, 5.96 g of Al will react to produce = (5.96 × 267)/54 = 29.47 g of AlCl₃.

Thus, 29.47 g of AlCl₃ were obtained from the reaction.

Answer: If [tex]\Delta G[/tex] for a reaction equals zero, the reaction is at equilibrium.

Explanation:

When a thermodynamic closed system tends to do the maximum amount of non-expansion work then the energy used to do this work is called Gibb's free energy.

The expression for [tex]\Delta G[/tex] can be written as follows.

[tex]\Delta G = \Delta H - T \Delta S[/tex]

where,

[tex]\Delta H[/tex] = enthalpy change

T = temperature

[tex]\Delta S[/tex] = entropy change

This means that [tex]\Delta G[/tex] is the difference between heat released in a process and the amount of heat released in a reversible manner for the same process. So, when the value of of [tex]\Delta G[/tex] comes out to be equal to zero then it means no heat is released or absorbed.

Hence, the reaction is stable or at equilibrium.

Thus, we can conclude that the value of [tex]\Delta G[/tex] = 0 then it means that the reaction is at equilibrium.

Answer:

26.0 mL

Explanation:

The reaction that takes place is:

First we calculate the molar concentration of the diluted sulfuric acid solution, using the C₁V₁=C₂V₂ formula:

Now we calculate how many H₂SO₄ moles would there be in 10.00 mL of this diluted solution, using the definition of molarity:

Then we convert 3.25 mmoles of H₂SO₄ into mmoles of NaOH, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate the required volume of the NaOH solution, using the definition of molarity:

Answer:

Upwelling is the natural process which brings cold, nutrient-rich water to the surface. A huge upwelling regularly occurs off the coast of Peru, which enjoys a large fishing industry as a result. Upwelling is a process in which currents bring deep, cold water to the surface of the ocean.

Explanation:

good luck

Answer:

Pb(NO3)2

Cd(NO3)2

Na2SO4

Explanation:

In the first part, addition of HCl leads to the formation of PbCl2 which is poorly soluble in water. This is the first precipitate that is filtered off.

When the pH is adjusted to 1 and H2S is bubbled in, CdS is formed. This is the second precipitate that is filtered off.

After this precipitate has been filtered off and the pH is adjusted to 8, addition of H2S and (NH4)2HPO4 does not lead to the formation of any other precipitate.

The yellow flame colour indicates the presence of Na^+ which must come from the presence of Na2SO4.

Answer:

Friston to energy

Explanation:

Friction to Energy as its a energy stooping the object form moving

Answer:

Epipelagic (sunlight)

Explanation:

Examples of organisms living in this zone are plankton, floating seaweed, jellyfish, tuna, many sharks, and dolphins.

Answer:

63.25 grams of CO₂

Explanation:

To convert from liters to grams, we first need to convert from liters to moles. To do this, we divide the liters by 22.4, the amount of liters of a gas per mole.

32.2 / 22.4

= 1.4375 moles of CO₂

Now we want to convert from moles to grams. To do this, we multiply the moles by the molar mass of CO₂. The total molar mass can be found on the periodic table by adding up the molar mass of carbon (12) and two oxygen (32).

12 + 32 = 44

Now we want to multiply the moles by the molar mass.

1.4375 • 44

= 63.25 grams of CO₂

This is your answer.

Hope this helps!

Answer:

By walking and stuff, duh.

Explanation:

We walk, motion.

We drive, motion.

We eat, motion.

We talk, motion.

Answer:

The correct answer is -

3-methoxypentanoic acid, and

4-chlorobenzoic acid

Explanation:

1. condensed formula of the molecule is -

CH3CH2CH(OCH3)CH2COOH and the number of the carbons would be count from the end of carboxylic acid. So, the counting as given in the image, it shows there are 5 carbon so it is Penta and has methyl group on fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid

2. similarly for the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C1 and chlorine is in C4 so the name would be 4-chlorobenzoic acid.

The International Union of Pure and Applied Chemistry (commonly abbreviated to IUPAC) recommends a systematic approach for the nomenclature of organic compounds, which is referred to as the IUPAC nomenclature of organic compounds. Here the IUPAC names are 4-methyl pentanoic acid and 4-chlorobenzoic acid.

In essence, the condensed structural formula is a system for writing organic compounds in a single line of text.

1. CH₃CH₂CH(OCH₃)CH₂COOH and the number of the carbons would be counted from the end of carboxylic acid. So, the counting as given in the image shows there are 5 carbon so it is Penta and has methyl group on the fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid

2. Similarly the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C-1 and chlorine is in C-4 so the name would be 4-chlorobenzoic acid.

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