2.
Given the following reaction2Na2S2O3 + AgBr
NaBr + Naz[Ag(S203)2]
a. How many moles of Na2S2O3 are needed to react completely with 42.7 g of AgBr?

Answer:

The number of mole is 0.04167mole

Explanation:

To convert gram to mole, we need to calculate the molecular weight of the compound

C6H12O6

C - 12

H - 1

O - 16

Molecular weight = 6 * 12 + 1 *12 + 6 * 16

= 72 + 12 + 96

= 180g/mol

To covert gram to mole

Therefore,

= 7.50g/ 180g/mol

= 0.04167 mole of glucose

Final answer:

The vampire squid's lights are powered by bacteria called Vibrio fischeri.

Explanation:

The vampire squid possesses bioluminescent organs called photophores that enable it to produce light. These photophores are powered by bacteria called Vibrio fischeri which live symbiotically within the squid's light organs. The bacteria produce an enzyme called luciferase that acts on a substrate called luciferin, resulting in the emission of light.

Answer:

D - chemical and physical

Explanation:

Only chemical and physical changes can reach the level of dynamic equilibrium. Nuclear reactions cannot reach dynamic equilibrium.

Answer:

The answer is-2168kj/mol

Explanation:

Formula is product-reactant

Product is B2O3+3H2O

B2O3=-1274kj/mol

3H2O=3(-286)=-858kj/mol

Reactant is B2H6

B2H6=36kj/mol

Product-reactant=-858-1274-36

=-2168kj/mol

Answer:

first you subtract then you divide the equation an the you get your ansewe

Explanation:

Hey there!

CH₄ + 2O₂ → CO₂ + 2H₂O

carbon dioxide: product

methane: reactant

oxygen: reactant

water: product

Methane and oxygen are reactants because they are the substances we start with. They are on the side of the equation that the arrow is pointing away from.

Carbon dioxide and water are products because they are the new substances  that are the yields of the equation. They are on the side of the equation that the arrow is pointing towards.

Hope this helps!

Answer:

carbon dioxide: product

methane: reactant

oxygen: reactant

water: product

Explanation:

correct on edg

Answer:

Option C. 3.85g

Explanation:

2NH3 <=> N2 + 3H2

Molar Mass of NH3 = 14.0067+ (3x1.0078) = 14.0067 + 3.02352 = 17.03022g/mol

Mass of NH3 from the balanced equation = 2 x 17.03022 = 34.06044g

Molar Mass of H2 = 2x1.00784 = 2.01568g/mol

Mass of H2 from the balanced equation = 3 x 2.01568 = 6.04704g

From the equation,

34.06044g of NH3 produced 6.04704g of H2

Therefore, 21.7 of NH3 will produce = (21.7 x 6.04704)/34.06044 = 3.85g of H2

Answer:

12 is the length with accuracy and correct degree of precision.

Explanation:

Answer:

12 cm

That's your answer!!

The pressure of the gas would increase.

Explanation:

Using the ideal gas formulae we can evaluate this fact;

P₁V₁/T₁ = P₂V₂/T₂

We can assume that the volume is reduced by half (the T₁ and T₂ will cancel out because they remain constant);

P₁V₁ = P₂ * 0.5V₁

P₁V₁/0.5V₁ = P₂

P₁/0.5 = P₂

You can observe that the pressure will also increase – diving a number by a fraction or decimal number increases the resultant value. In this case, the pressure will increase by 2 fold

It's all three of the answers

Answer:

All of these will be correct, so check-box all of them.

Explanation:

Can i please have brainliest?

Answer:

0.67mol/Kg

Explanation:

The following were obtained from the question:

Mole of solute = 0.50mol

Mass of solvent = 750g = 750/1000 = 0.75Kg

Molality =?

Molality = mole of solute /mass of solvent

Molality = 0.5/0.75

Molality = 0.67mol/Kg

The absolute pressure inside the ball is 1.25atm.

Explanation:

Given-

Volume, V = 5..27L

Temperature, T = 27°C

Gauge Pressure, Pg = 0.25 atm

Atmospheric pressure, Patm = 1 atm

Absolute pressure, Pabs = ?

We know,

[tex]Pabs = Pg + Patm\\\\\\Pabs = 0.25 + 1 atm\\\\Pabs = 1.25atm[/tex]

Therefore, absolute pressure inside the ball is 1.25atm.

Answer:

The absolute pressure inside the ball is 1.25 atmospheres.

The ball contains 0.267 mole of air.

Explanation:

im typing this to trick the algorithm but yeah that's right lol

Answer:

density is defined as the ratio of mass to volume of a object

Answer:

The term density can be defined as the mass per unit volume of a substance.

Explanation:

The term density can be defined as the mass per unit volume of a substance.

The mathematical expression for density;

[tex]{Density P}=\frac{\text{Mass M}}{\text{Volume V}}[/tex]

The symbol for density is P, pronounced as "rho".

Also, the SI unit for measuring density is kg/m³.

The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases.

Answer:

well, through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP

Answer:

Oxygen is mixed with certain chemicals in a plant to make Carbon Dioxide and then the plant uses that to eat. So even if humans disappeared plants could still survive.

Explanation:

Answer:Jelly Beans are a mixture

Explanation:

you cannot separate them

Answer:

B. The atoms of the reactants have combined to form a new substance.

Explanation:

When hydrogen and oxygen gas combined they form hydrogen peroxide. This is happen through chemical reaction so a new substance is formed. The state of reactant is also different, reactants are present in gaseous form while product is present in liquid form. So option b is correct.

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> H2O2  (l)

Explanation: The chemical reaction has combined the atoms of hydrogen gas and the atoms of oxygen gas to form a new substance. Since hydrogen peroxide is a different substance, it has different chemical and physical properties. All chemical reactions produce new substances with different chemical and physical properties than the reactants.

Answer:

A reaction will occur when CaCl2 is combined with F2.

Explanation:

Let us know the terms at first.

Ca- Calcium

Cl2- Chloride, therefore CaCl2 is Ca+ Cl2 and that is calcium chloride.

Now, F2 is fluorine which is a yellow compressed gas.

When CaCl2 combines with F2, it gives out products like CaF2 or calcium fluoride, which is a white crystalline solid in powder form, and Cl or chlorine, which appears as a greenish-yellow compressed liquid gas with a pungent smell.

Here is the equation,

CaCl2+ F2= CaF2+ Cl.

Final answer:

A reaction occurs when CaCl2 is combined with F2, resulting from fluorine's higher reactivity which allows it to displace chlorine in a single-replacement reaction.

Explanation:

A reaction will occur when CaCl2 is combined with F2. This is due to the fact that in the context of a single-replacement reaction, a more reactive halogen (in this case, fluorine) can displace a less reactive halogen (like chlorine in CaCl2) from its compound. The example provided in the supporting information illustrates a similar scenario where the reactivity of fluorine above bromine on the periodic table allows for the replacement to occur, yielding products such as CaF2 and Br2. Therefore, fluorine (F2) is the correct answer.

Answer:

103.8 g

Explanation:

When the hot piece of copper is placed in the water at lower temperature, the piece of copper gives off thermal energy to the water; as a result, the temperature of the copper decreases while the temperature of the water increases, until they both reach the equilibrium temperature.

The heat given off by the piece of copper is equal to the heat absorbed by the water, so we can write:

[tex]Q_c=Q_w[/tex]

where:

[tex]Q_w=m_w C_w \Delta T_w[/tex] is the heat absorbed by the water, where

[tex]m_w = 96.2 g[/tex] is the mass of water

[tex]C_w=4.186 J/gC[/tex] is the specific heat of water

[tex]\Delta T_w=5.1C[/tex] is the rise in temperature of the water

Solving,

[tex]Q_w=(96.2)(4.186)(5.1)=2053.7 J[/tex]

[tex]Q_c=m_c C_c (T_c-T)[/tex] is the heat released by the copper, where

[tex]m_c[/tex] is the mass of copper

[tex]C_c=0.385 J/gC[/tex] is the specific heat of copper

[tex]T_c=73.6C[/tex] is the initial temperature of copper

[tex]T=17.1C+5.1C=22.2 C[/tex] is the equilibrium temperature

Solving for the mass,

[tex]m_c=\frac{Q_c}{C_c(T_c-T)}=\frac{2053.7}{(0.385)(73.6-22.2)}=103.8 g[/tex]

The correct answer is the mass of the copper piece is approximately 16.3 grams.

To solve this problem, we can use the principle of conservation of energy, which states that the heat lost by the copper will be equal to the heat gained by the water.

The heat transfer can be calculated using the formula:

[tex]\[ q = mc\Delta T \][/tex]

For the copper piece, the heat lost is given by:

[tex]\[ q_{copper} = m_{copper}c_{copper}(T_{final} - T_{initial,copper}) \][/tex]

For the water, the heat gained is given by:

[tex]\[ q_{water} = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]

Since the heat lost by the copper is equal to the heat gained by the water, we can set the two equations equal to each other:

[tex]\[ m_{copper}c_{copper}(T_{final} - T_{initial,copper}) = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]

Given that [tex]\( T_{final} \)[/tex] is the temperature of the water after the copper is added plus the temperature rise:

[tex](17.1C + 5.1C = 22.2C), \( T_{initial,copper} \) is 73.6C, and \( T_{initial,water} \) is 17.1C,[/tex]we can plug in the values:

[tex]\[ m_{copper}(0.385)(22.2 - 73.6) = (96.2)(4.184)(22.2 - 17.1) \][/tex]

Now, we solve for [tex]\( m_{copper} \)[/tex]:

[tex]\[ m_{copper} = \frac{(96.2)(4.184)(22.2 - 17.1)}{(0.385)(22.2 - 73.6)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} \approx \frac{(96.2)(4.184)(5.1)}{(-20.163)} \] \[ m_{copper} \approx -16.3 \text{ grams} \][/tex]

Since mass cannot be negative, the negative sign indicates a direction in heat transfer (the copper loses heat), but the magnitude of the mass is what we're interested in.

Therefore, the mass of the copper piece is approximately 16.3 grams.

14.292 grams of Fe2O3 is formed when 10 gram of iron metal is burned.

Explanation:

The balanced equation for the reaction is to be known so that number of moles taking part can be known.

The balanced chemical equation is

4Fe + 3[tex]O_{2}[/tex]⇒ 2 [tex]Fe{2}[/tex][tex]O{3}[/tex]

From the given weight of iron to be used for the production of [tex]Fe{2}[/tex][tex]O{3}[/tex], number of moles of Fe taking part in the reaction can be known by the formula:

Number of moles= mass ÷ Atomic mass of one mole of the element.

(Atomic weight of Fe is 55.845 gm/mole)

  Putting the values in equation  

Number of moles =  10 gm  ÷ 55.845 gm/mole

                               =  0.179 moles

Applying the stoichiometry concept

4 moles of Fe gives 2 Moles of Fe2O3

0.179 moles will produce x moles of Fe2O3

 So,  2÷ 4 = x ÷ 0.179

     2/4 = x/ 0.179

    2 × 0.179 = 4x

     2 × 0.179 / 4 = x

  x = 0.0895 moles

So from 10 grams of iron metal 0.0895 moles of Fe2O3 is formed.

Now the formula used above will give the weight of Fe2O3

weight = atomic weight × number of moles

            =  159.69 grams ×  0.0895

             = 14.292 grams of Fe2O3 formed.

When 10.00 g of iron metal is burned in the presence of excess O2, 14.30 g of Fe2O3 will form.

When iron metal reacts with oxygen in the presence of excess oxygen, it forms iron(III) oxide (Fe2O3). The balanced equation for this reaction is:

4Fe + 3O2 → 2Fe2O3

Using the molar mass of iron, we can calculate the number of moles of iron in 10.00 g:

10.00 g Fe ÷ (55.85 g/mol Fe) = 0.1787 mol Fe

Since the reaction ratio is 4:2, we can calculate the number of moles of Fe2O3 formed:

0.1787 mol Fe × (2 mol Fe2O3 ÷ 4 mol Fe) = 0.0894 mol Fe2O3

Finally, we can convert the number of moles of Fe2O3 to grams:

0.0894 mol Fe2O3 × (159.69 g/mol Fe2O3) = 14.30 g Fe2O3

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Answer:

box a is warmer than box b, so the molecules are moving around a lot more

Answer:

A symmetry element is a line, a plane or a point in or through an object, about which a rotation or reflection leaves the object in an orientation indistinguishable from the original.

Explanation:

Symmetry in chemistry is a mathematical concept applied to molecular and crystalline structures, assisting in classifying molecules, predicting vibrational spectra, and understanding bonding.

Symmetry in chemistry refers to the balance and proportion found in molecular structures and crystals. Though it stems from mathematical concepts, symmetry and group theory serve as fundamental tools in understanding various aspects of chemical behavior.

Chemists leverage these concepts to classify molecular structures, predict vibrational spectra, and assess chemical bonding.

C. Phosphate is the non renewable resource found in the state of Florida.

Explanation:

There are so many things made from the non renewable resource, phosphate found in the state of Florida.

It is used in the large scale preparation of fertilizers, that is supplied to the world wide farmers and small amount of the phosphate is  utilized to manufacture some of the supplements like soft drinks, tooth paste and vitamins.

Both gas and oil are  also non-renewable, since it takes an ample amount of time  to regenerate.

Answer:

3.16g

Explanation:

Data obtained from the question include:

I = 4A

t = 40mins = 40 x 60 = 2400secs

Q =?

Q = It

Q = 4 x 2400

Q = 9600C

Now let us generate a balanced half equation to determine the number faraday needed to deposit metallic Cu. This is illustrated:

Cu^2+ + 2e —> Cu

From the equation,

2 faraday is needed to deposit metallic cu

1 faraday = 96500C

Therefore 2 faraday = 2 x 96500 = 193000C

Molar Mass of Cu = 63.5g/mol

193000C deposited 63.5g of Cu

Therefore, 9600C will deposit = (9600 x 63.5)/193000 = 3.16g of Cu

Explanation:

Answer:

Algebra is an area in mathematics that uses variables, in the forms of letters and symbols, to act as numbers or quantities in equations and formulas. Geometry is an area in mathematics that studies points, lines, varied-dimensional objects and shapes, surfaces, and solids.

Explanation:

It is your own opinion on which is more difficult. In my opinion, Geometry is more difficult.

Answer: I believe they want you to know the variables; and Newton described what? Force, action, mass.

I think you should read the Laws, and see how the variables, those important pieces, are shown in an equation. That will be of real help to you. Get the very basics down in your head (and on paper), and it will be much easier!

Explanation:

(0.48 gram) x (1mole / 4.0 gram) = 0.48/4.0 = 0.12 mole

Mole measure the number of elementary entities of a given substance that are present in a given sample. The mole of helium gas is 0.115 mole.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to the molar mass of a substance and directly proportional to the given mass of that substance.

Mathematically,

mole of helium gas =given mass of helium ÷ molar mass of helium gas

Molar mass of helium=4 g/mol

Mass of helium =  0.46g

Substituting the values in above formula we get

Mole of helium gas  =  0.46g÷ 4 g/mol

Mole of helium gas  = 0.115 mole

Therefore, the mole of helium gas is 0.115 mole.

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Final answer:

To initiate the precipitation of CaSO4, enough Na2SO4 solution must be added to increase the sulfate ion concentration just above 9.86 × 10-5 M in the presence of 0.50 M Ca2+ ions.

Explanation:

To determine how much Na2SO4 solution is needed to initiate the precipitation of CaSO4, we must consider the solubility product constant (Ksp) of calcium sulfate and the concept of reaction quotient (Q). Calcium sulfate will precipitate when the product of the concentrations of its ions in the solution exceeds its Ksp value. For calcium sulfate, this value is 4.93 × 10-5. The formula to calculate Q for calcium sulfate is Q = [Ca2+][SO42-]. Given that the concentration of Ca2+ ions is 0.50 M, we can rearrange the inequality for [SO42-] to determine the maximum concentration before precipitation occurs:

[0.50 M] [SO42-] < 4.93 × 10-5
[SO42-] < ¹⁹.86 × 10-5 M

To initiate precipitation, we need to add enough Na2SO4 solution to the Ca(NO3)2 solution to increase the sulfate ion concentration just above 9.86 × 10-5 M.

Answer: Depending on the state of change it can be a physical change. Example: Evaporation is the physical change of a liquid turned into a gas.

That said, I'm pretty sure the answer is (True)

Note: Hope this is correct and it helps. Good luck :)

Answer:

Mass, gravitational force and height

Explanation:

Potential energy of body is the energy at rest in a body and it depends on the mass, acceleration due to gravity and height of a body;

  Potential energy = mass x gravity x height  = mgh

The more the mass, gravity and height of a body, the higher the potential energy a body will posses. This is why a stone at a height has more potential energy than one on the ground.