How can you tell for sure that a redox reaction has happened?

Answers

Answer 1

Answer:

Determine the value of the oxidation numbers of atoms or ions on the reactant side and the product side.

Explanation:

A redox reaction involves some ions, and atoms losing electrons and other gaining them in the same reaction. When oxidation occurs, there is loss of electrons by an element thus its oxidation number increases; becomes more positive. When reduction occurs an element gains electrons and the oxidation  number becomes more negative; reduces.

If an element (s) behaves in this manner in the whole reaction, then be sure to deduce that a redox reaction has occurred.

Answer 2

Answer:

If oxidation state changes, it is a redox reaction

Explanation:


Related Questions

Why resolution power in TEM microscope is higher than SEM microscope

Answers

Answer:

Here's what I get.

Explanation:

Two factors:

1. Higher accelerating voltages

Both types use a beam of accelerated electrons as a source of illumination.

Resolution depends on the wavelength of the electron beam. The shorter the wavelength, the smaller the objects you can "see."

SEMs usually use acceleration voltages up to 30 kV, while TEMs can set them as high 300 kV. Thus, the electron wavelengths in TEMs are shorter by a factor of 10.

2. Less spherical aberration

Spherical aberration degrades the quality of the image. It decreases as wavelength decreases, so you can push the magnification higher with a TEM without losing image quality.

Answer:

idfk

Explanation:

Chlorine gas react with potassium bromide. Predict the products of this reaction and their states.
Give an explanation for you answer.​
can someone please explain how I get to an answer please

Answers

Answer:

See below.

Explanation:

Chlorine gas replaces the bromine in  potassium bromide to form potassium chloride and bromine liquid is released.

The equation for the reaction is:

Cl2 (g) + 2KBr (s) = KCl  (s) + Br2 (l).

This reaction occurs because chlorine is more reactive then bromine.

Determine the volume in liters of a 1.00 ounce bottle. (1.06 qt. = 1 L; 32 ounces= 1 qt)

Answers

Final answer:

A 1.00-ounce bottle holds approximately 0.0295 liters of liquid, by converting ounces to quarts (1.00 ounce / 32 ounces), and then quarts to liters (the resulting number of quarts / 1.06).

Explanation:

Given that there are 32 ounces in 1 quart and 1.06 quarts in 1 liter, we can first convert ounces to quarts, and then quarts to liters. So, if we have 1.00 ounce, we simply divide this number by 32 to get the equivalent in quarts. The answer is about 0.03125 quarts. Then, we convert quarts to liters by dividing the number of quarts obtained by 1.06, yielding approximately 0.0295 liters.

Thus, a 1.00-ounce bottle would hold about 0.0295 liters of liquid.

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Can someone plz explain ionic and covalent bonding plzzzz!!!

Answers

Answer:

Ionic Bonding: The formation of an Ionic bond is the result of the transfer of one or more electrons from a metal onto a non-metal.

Covalent Bonding: Bonding between non-metals consists of two electrons shared between two atoms.

Explanation:

if you supply 3600 kJ of heat, how many grams of ice at 0°C can be melted, heated to its boiling point? (Make M your X in equations) (figure out which q you need)

Answers

Answer:

=1.36kg

Explanation:

First heat is absorbed to melt the ice- latent heat of fusion of ice then heat is absorbed to raise the temperature to 373K

The specific heat capacity of water is 4.187kJ/kg/K while  the latent heat of fusion of ice is 2230kJ/kg/K.

Letting the mass of the ice to be =x

x×2230kJ/kg/K + x×4.187kJ/kg/K×100K= 3600kJ

2230x+418.7x=3600

2647.8x=3600

x=1.36 kg

A scientist wants to use a model to help present the results of his detailed scientific investigation.

Why would a model be useful?

because the model makes the concepts easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it

Answers

Because the model makes the concepts easier to understand.

Answer:

A. because the model makes the concepts easier to understand

Edge.2023

Explanation:

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In what zone of the ocean are thermal vents found? How are they related to organisms in this zone?

Answers

the very bottom of the ocean and they are relevant by most of the animals feed off of the animals that come out of he vents

Explain how to convert a mass of compound A to a mass of compound D in words with no equations using the following reaction 2A + 4B -> C + 3D​

Answers

Answer:

Explanation:

The given reaction equation is:

                2A + 4B → C + 3D

We know the mass of compound A in the reaction above. We are to find the mass of compound D.

We simply work from the known mass to calculate the mass of the unkown compound D

Using the mole concept, we can find the unknown mass.

Procedures

We first find the molar mass of the compound A from the atomic units of the constituent elements. We then use the molar mass of A to calculate its number of moles using the expression below:  

            Number of moles of A = [tex]\frac{mass of A}{molar mass of A}[/tex]

Using the known number of moles of A, we can work out the number of moles of D.

           From the balanced equation of the reaction, it is shown that:

         2 moles of compound A was used up to produced 3 moles of D

  Then [tex]\frac{3}{2}[/tex] x number of moles of A would give the number of moles of D

Now that we know the number of moles of D, we can find its mass using the expression below:

             Mass of D = number of moles of D x molar mass of D

At 40.0°C, the pressure inside a nitrogen-filled tennis ball with a volume of 148
cm is 235 kPa. How many moles of nitrogen (N2) are in the tennis ball?
A 13.4 mol
B 4.22 * 102 mol
C 1.34 x 10-2 mol
OD 0.105 mol

Answers

Answer:

the answer is

n = 0.01336 mol

Explanation:

To determine the number of moles of a gas, we need to have an expression that relates the pressure, temperature and volume of the system. For simplification, we assume that this gas is ideal so we use the equation PV=nRT. We calculate as follows:

PV=nRT

n = PV / RT

n = 235000(1.48x10^-4) / (8.314)(40+273.15)

n = 0.01336 mol

Answer : The correct option is, (B) [tex]1.34\times 10^2mol[/tex]

Explanation :

To calculate the moles of nitrogen gas we are using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = pressure of nitrogen gas = 235 kPa = 2.319 atm

Conversion used : (1 atm = 101.325 kPa)

V = volume of nitrogen gas = [tex]148cm^3=148mL=0.148L[/tex]

Conversion used : (1 L= 1000 mL)

T = temperature of nitrogen gas = [tex]40.0^oC=273+40.0=313K[/tex]

R = gas constant = 0.0821 L.atm/mole.K

n = moles of nitrogen gas = ?

Now put all the given values in the ideal gas equation, we get:

[tex](2.319atm)\times (0.148L)=n\times (0.0821L.atm/mole.K)\times (313K)[/tex]

[tex]n=0.0134mol=1.34\times 10^2mol[/tex]

Therefore, the number of moles of nitrogen gas are, [tex]1.34\times 10^2mol[/tex]

Which of the following is true for the equilibrium constant of a reaction?

It is a ratio of coefficients of reactants to products.
It has a different value at different temperatures.
It is represented by the symbol H.
Its value is always less than 1.

Answers

Answer:

It has a different value at different temperatures.

Explanation:

For any system in equilibrium, the molar concentration of all the species on the right hand side are related to the molar concentrations of those at the left side by a constant known as the equilibrium constant.

The equilibrium is a constant at a given temperature as it is temperature dependent.

A change in temperature of an equilibrium system shifts the system to a new equilibrium point. A rise in temperature actually shifts equilibrium position to the direction that absorbs heat and vice versa.

The shift in equilibrium as a result of temperature change is actually a change in the value of the equilibrium constant. Equilibrium constant is represented as [tex]K_{eq}[/tex]

The derivation of the equilibrium constant is based on the Law of Mass Action which states: the rate of a chemical reaction is proportional to the product of the concentrations of the reacting substances.

Answer:

It has a different value at different temperatures.

Explanation:

I took the test, and this answer was correct

how many molecules of carbon dioxide are in 3.2 moles of carbon dioxide

Answers

Answer:

   1.93 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles of CO₂ = 3.2 moles

To find the number of molecules of CO₂ in 3.2 moles, we simply use the expression below :

       Number of particles = number of moles x 6.02 x 10²³

The above equation relates the number of particles such as molecules, atoms, protons, electrons to the number of moles.

A mole can be defined as the amount of substance contained in the avogadro's number of particles(6.02 x 10²³)

Number of particles = 3.2 x 6.02 x 10²³ = 19.264 x 10²³ =

                                         1.93 x 10²⁴molecules

In 3.2 moles of CO₂, there are approximately 1.92624 × 10²⁴ molecules.

The number of molecules of carbon dioxide in 3.2 moles can be calculated by using Avogadro's number. Avogadro's number is 6.022 × 10²³ molecules per mole.

Therefore, in 3.2 moles of CO₂, there are 3.2 x 6.022 × 10²³ = 1.92624 × 10²⁴ molecules of CO₂.

Which type of fire should never be put out with water?
paper fire
clothing fire
wood fire
grease fire

Answers

Answer:

grease fire. The others are solids that will easily be put out with water.

Answer:

grease fire

Explanation:

DOING THAT WILL JUST MAKE IT WORSE

hope it helps

when 45 g of an alloy, at 25°C, are dropped into 100.0g of water, the alloy absorbs 956J of heat. If the temperature of the alloy is 37°C, what is its specific heat?

A. 0.423 cal/g°C
B. 1.77 cal/g°C
C. 9.88 cal/g°C
D. 48.8 cal/g°C

Please try and explain with step by step or show work, thank you!!

Answers

You can use this formula to help:

[tex]c = \frac{q}{m \: \times \: change \: in \: t} [/tex]

Where:

C = specific heat

q = heat

m = mass

t = temperature

What we know:

C = unknown

q = 956 J

m = 45 g

change in t = 12°C because 37°C - 25°C = 12°C

Plug known values into the formula:

C = 956 J / (45 g) (12°C) and we are left with a specific heat of 1.77J/g°C

Now, convert Joules to calories and then you get:

Answer: A. 0.423 cal/g°C

If the temperature of the alloy is 37°C, 0.423 cal/g°C.  is its specific heat. The correct answer is A.

To find the specific heat of the alloy, we can use the formula:

Q = mcΔT

where:

Q = heat absorbed (in joules)

m = mass of the alloy (in grams)

c = specific heat of the alloy (in cal/g°C)

ΔT = change in temperature (in °C)

We are given Q = 956 J, m = 45 g, ΔT = (37°C - 25°C) = 12°C. Now, we need to convert the heat and temperature from joules to calories:

1 cal = 4.184 J

Q = 956 J * (1 cal / 4.184 J) = 228.74 cal

Now, we can rearrange the formula to solve for c:

c = Q / (m * ΔT) = 228.74 cal / (45 g * 12°C) ≈ 0.423 cal/g°C

Therefore, the correct answer is A. 0.423 cal/g°C.

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Which chemical equation is balanced? This is timed, please help!

Answers

Answer: It's the first one,

which of the following natural resources does not contribute to global warming

coal

natural gas

nuclear power

oil​

Answers

Answer:

The right choice is "nuclear power "

Explanation:

Human activities like burning coal for warming or for using in industries, heat our homes with oil, or switching on our natural gas stoves for cooking produce carbon dioxide gas and other gases (i.e. greenhouse gas) responsible for global warming .

while, nuclear power doesn't contribute to the universe with any of this greenhouse gas

So, the right choice is "nuclear power "

_______________ reactions transfer energy to the surroundings, usually as heat. A) Decomposition B) Endothermic C) Exothermic D) Synthesis

Answers

Answer: C EXOTHERMIC

Explanation:

Answer: C

Explanation:

which of these energy
resource is non rewnable?

Answers

Nonrenewable resources are those found inside the earth, and they took millions of years to form. These include the fossil fuels, oil, natural gas, and coal and nuclear energy

Need help on this ASAP !!!!

Answers

Answer:

2.5 moles of O₂

Explanation:

2RbNO₃⇒2RbNO₂+O₂-------------The equation is balanced

Mole ratio for the equation

2RbNO₃⇒2RbNO₂+O₂

2                2              1

RbNO₃:O

2:1---------------------------------------For every mole of oxygen produced ,two moles of RbNO₃ are required

Given

5 moles of RbNO₃  will produce ? moles of oxygen

2 moles of RbNO₃=1 mole of oxygen

5 moles of RbNO₃=?

=(5×1)/2 = 2.5 moles

A temperature change in a reaction indicates_____.

Answers

A temperature change in a reaction indicates a chemical change

Answer:

A temperature change in a reaction indicates occurrence of chemical change.

Explanation:

In chemistry, two types of reaction are always witnessed. One is physical reaction whereas the other is chemical reaction. In a chemical reaction, there is an adjustment in the organization of the substances whereas in a physical change there is a distinction in the appearance, smell, or straightforward showcase of an example of issue without an adjustment in structure.

At the point when bonds are broken and new ones are shaped, a compound change happens. The following happenings indicate the chemical change:

Change in Temperature  Change in Color  Recognizable Odor  Development of a Precipitate or bubbles

What volume in mt, of 0.5a M1HCI solution is needed to neutralize 77 ml of 1.54 M NaOH solution?

Answers

Answer:

237.2 mL.

Explanation:

We have the rule: at neutralization, the no. of millimoles of acid is equal to the no. of millimoles of the base.

(XMV) acid = (XMV) base.

where, X is the no. of (H) or (OH) reproducible in acid or base, respectively.

M is the molarity of the acid or base.

V is the volume of the acid or base.

(XMV) HCl = (XMV) NaOH.

For HCl; X = 1, M = 0.5 M, V = ??? mL.

For NaOH, X = 1, M = 1.54 M, V = 77.0 mL.

∴ V of HCl = (XMV) NaOH / (XV) HCl = (1)(1.54 M)(77.0 mL) / (1)(0.5 M) = 237.2 mL.

Which substance is an Arrhenius acid?
a. H2
b.HCI
c. KCI
d, NH,3​

Answers

Answer:

Hcl

Explanation:

Arrhenius acid - produce H+

Arrhenius base - produce oh -

we can see here in the option B give us H+ which is arrhenius acid

HCl  is an Arrhenius acid. Hence, option B is correct.

What is an Arrhenius acid?

According to Arrhenius's theory, acid is a substance that gives[tex]H^+[/tex] ion on dissolving in the aqueous solution.

It increases the concentration of [tex]H^+[/tex] ions in the solution.

The base is a substance that ionizes[tex]OH^-[/tex] ions by dissolving in the aqueous solution.

Arrhenius acid - produce [tex]H^+[/tex]

Arrhenius base - produce [tex]OH^-[/tex]

Hence, option B is correct.

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Under what conditions will a gas be least likely to exhibit the ideal gas properties predicted by the ideal gas law?

Answers

Final answer:

A gas deviates most from the ideal gas law at low temperatures and high pressures due to the increased significance of molecule volume and intermolecular attractions.

Explanation:

A gas will be least likely to exhibit the ideal gas properties predicted by the ideal gas law under conditions of low temperatures and very high pressures. At high pressures, gas molecules are forced closer together, which means they occupy a more significant volume relative to the space they are in, challenging the assumption that their volume is negligible. At low temperatures, the decreased kinetic energy of the gas particles means that intermolecular attractions become more significant, further deviating from ideal behavior.


The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

A. Argon
B. Xenon
C. Helium
D. Krypton

The gases used in different types of welding would include

A. oxygen and hydrogen
B. oxygen, hydrogen, acetylene and nitrogen
C. oxygen, acetylene and argon
D. oxygen and acetylene

The property of a substance to absorb moisture from the air on exposure is called

A. osmosis
B. deliquescence
C. efflorescence
D. desiccation

In which of the following activities silicon carbide is used?

A. Making cement and glass
B. Disinfecting water of ponds
C. cutting very hard substances
D. Making casts for statues

The average salinity of sea water is

A. 3%
B. 3.5%
C. 2.5%
D. 2%

Answers

Answer:

1.  C. helium

2.  D. oxygen and acetylene

3.  B.  deliquescence

4.  C.  cutting very hard surfaces

5.  B.  3.5%

Explanation:

Engineers increase output in crop production by combining the strengths of
two plants. This can be done by using one plant to pollinate a different plant
so that their strengths are combined into a new plant. What is this technique
called?

Answers

Answer:

Cross-pollination

Explanation:

This technique is used to create new varieties, usually with stronger characteristics than the two original varieties. When the pollen of one variety is placed to a different plant's stigma, the resulting seeds create a new variety. This cross-pollination is used in plants of the same species.  

Answer:

Crossbreeding

Explanation:

apex

Which is not a strong electrolyte?

Some bases

Water

Some acids

Salts

Answers

Answer:

Water

Explanation:

Strong electrolytes will completely ionize in water, and water cannot do that to itself.

which is not a strong electrolyte?

water

If a reaction has a ΔG of -136kJ at 110 ºC, will it be spontaneous at this temperature (110 ºC)?

Answers

Answer:

The reaction will be spontaneous.

Explanation:

The change in free energy (ΔG) is the difference between the heat released during a process and the heat released for the same process occurring in a reversible manner.

The sign of ΔG gives an indication for the spontaneity of the reaction:

If ΔG is negative, the reaction is spontaneous.  

If ΔG = zero, the reaction is at equilibrium.

If ΔG is positive, the reaction is non-spontaneous.

Answer: The Answer is Yes! at least on odyssey ware

Explanation: I Know this is right because I was right and got a solid 100% on it. So there is the answer for yall legends!

What’s the charge of cu3PO4

Answers

Answer:No charge

Explanation:

Cu3PO4 is an ionic compound which my definition has no charge (or a charge of 0). But if you are referring to the ions themselves that make up the compound, PO4 is a polyatomic ion so you can look up its charge in a polyatomic ion chart (it is 3-). Thus since there are 3 Cu's per PO4^3-, each Cu must have a charge of 1+.

Final answer:

The charge of Cu3PO4 is neutral, and each Cu ion in the molecule carries a +1 charge to balance the -3 charge from the phosphate ion.

Explanation:

The compound Cu3PO4 is made up of Cu (Copper) and PO4 (Phosphate) ions. When these ions bind to form an ionic compound such as Cu3PO4, the total charge of the compound should be neutral.

The charge of Cu3(PO4)2 is +2.

In this case, phosphate has a charge of -3, and for the molecule to be neutral, the total charge from the 3 Copper ions must be +3, making the charge of each Cu (Copper) ion as +1.

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(Multiple choice) Which actions are part of the dissolution process of an ionic solute in water?

The ions are pushed together to form molecules.

Each ion is surrounded by water molecules.

The water molecules attract some ions and repel others.

The ions in the solute separate from each other.

The water molecules break apart into ions.

Answers

Answer: Each ion is surrounded by water molecules

Explanation: The ions are surround by the water molecules which act as a barrier around the ions and prevent the recombination of ions. The ions are said to be hydrated.

Answer:

Each ion is surrounded by water molecules.

Explanation:

During dissolution of ionic solute in water the following process occur

a) Breaking of molecule into separate ions (need lattice energy)

b) hydration of each ion by water molecules (hydration energy is released)

c) due to hydration the ions of solutes further become far from each other.

There is no breaking of water molecule or the ions do not combine to form molecule.

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?
The modern model is not as widely accepted by scientists as Dalton’s model.
The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
The modern model recognizes particles in the atom, whereas Dalton’s model does not.
The modern model does not explain emission spectra, whereas Dalton’s model does.

Answers

Answer:

The modern model recognizes particles in the atom, whereas Dalton’s model does not.

Explanation:

The modern model considers the atom to consist of electrons, protons, and neutrons.

A is wrong. The modern model of the atom is widely accepted.

B is wrong. Dalton assumed that all atoms are identical. The modern model recognizes that there are isotopes of atoms.

D is wrong. The modern model explains emission spectra. Dalton's model does not.

Answer:

C. The modern model recognizes particles in the atom, whereas Dalton’s model does not.

Explanation:

IM JUST HIM

Which is capable of housing while they conduct research

A rover

A satellite

A space station

A space observation

Answers

Answer:

A space station

Explanation:

A space station provides an avenue for scientist to orbit the space and carryout scientific findings. Most space stations are usually controlled under agreement between different countries. The international space station is one such example.

A rover is usually a robotic device that has been pre-programmed and equipped with state of the art devices to carryout explorations on their own.

Most space observations are usually powerful telescopes on the earth surface that monitors events in space.

A satellite is a body that orbits another.

Answer:

space station

Explanation:

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