Someone please help!!
Balances these redox equations

Cr2O7^2-(aq)+ I-(aq)-> Cr^3+(aq)+ I2(s)

Answer:

Chain reaction

Explanation:

Answer:

im not sure what answer you're looking for here, their called valence electrons if thats what you're looking for.

Explanation:

Answer:

Coal is formed when dead plant matter submerged in swamp environments is subjected to the geological forces of heat and pressure over hundreds of millions of years. Over time, the plant matter transforms from moist, low-carbon peat, to coal, an energy- and carbon-dense black or brownish-black sedimentary rock.

Answer:

It does not contain free mobile ions

Explanation:

Solid sodium chloride does not conduct electricity because it does not contain free mobile ions.

In solid state ions are arranged into crystal lattice and will not conduct a current of electricity.

Answer:

1. Empirical formula => CH2O2

2. Molecular formula => C2H4O4

Explanation:

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

Carbon (C) = 26.4 %

Hydrogen (H) = 3.3 %

Oxygen (O) = 70.3 %

Molar mass of compound = 91.0 g/mol

Empirical formula =..?

Molecular formula =..?

1. Determination of the empirical formula of the compound.

C = 26.4 %

H = 3.3 %

O = 70.3 %

Divide by their molar mass

C = 26.4 /12 = 2.2

H = 3.3 /1 = 3.3

O = 70.3 /16 = 4.39

Divide by the smallest

C = 2.2 /2.2 = 1

H = 3.3 /2.2 = 2

O = 4.39 /2.2 = 2

Empirical formula => CH2O2

2. Determination of the molecular formula of the compound.

Molar mass of compound = 91.0 g/mol

Empirical formula => CH2O2

Molecular formula => [CH2O2]n

We shall determine the value of n as follow:

[CH2O2]n = 91

[12 + (2×1) + (2×16)]n = 91

[12 + 2 + 32]n = 91

46n = 91

Divide both side by 46

n = 91/46

n = 2

Molecular formula => [CH2O2]n

Molecular formula => C2H4O4

In the given case where 26.4 % Carbon , 3.3 % Hydrogen , 70.3 % Oxygen , and Molar Mass: 91.0 g/mol the:

Given:

Carbon (C) = 26.4 %  

Hydrogen (H) = 3.3 %  

Oxygen (O) = 70.3 %  

Molar mass of compound = 91.0 g/mol  

Determination of the empirical formula of the compound:-

The ratio is CHO = 1 : 1.5 : 2

multiply with 2 to find correct and complete number ratio

C = 1 × 2 = 2

H = 1.5 × 2 = 3

O = 2 × 2 = 4

Thus,  the Empirical formula => [tex]C_2H_3O_4[/tex]

Mass × n = molar mass

12 × 2 + 1 × 3 + 16 × 4 = 91

24 + 3 + 64 = 91

91 = 91

Thus moles are 1 which means

molecular formula =  ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]

Thus, here in the given data:

Molecular Formula: ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]

Learn more:

https://brainly.com/question/15960587

Answer:

adding 3 tbsp. of salt should be about enough to make the egg float.

Explanation:

The density of the average egg will be slightly greater than that of water, so it will sink. To make the egg float, we have to make the water more dense by adding salt. For 1 cup of water.

Answer:

Potassium (K)

Explanation:

Out of the four options, Potassium is the only one to fill a total of 4 energy levels.

Both Cesium (Cs) and Rubidium (Rb) fill more than three energy levels, with Cesium filling 6 and Rubidium filling 5.

Sodium (Na) only fills 3 energy levels.

Thus, that leaves Potassium (K), which has 4 energy levels.

Hope this helped ^-^

Answer: fault-block mountain

Explanation:

I got it right on edgen 2020

Answer:

d fault-block mountain

Explanation:

Answer:

Cloud condensation nuclei or CCNs are small particles typically 0.2 µm, or 1/100 the size of a cloud droplet on which water vapor condenses. Water requires a non-gaseous surface to make the transition from a vapour to a liquid; this process is called condensation.

Answer:The units of molarity are M or mol/L. A 1 M solution is said to be “one molar.”

Explanation:

Answer:

mol/L

Explanation:

Cell Membrane. Has multiple proteins between it that allow certain things in and out. I think.

Answer:

1.10 × 10⁻¹² m

General Formulas and Concepts:

Chemistry - Atomic Structure

Speed of Light = Wavelength times Frequency

Explanation:

Step 1: Define

ν  = 2.73 × 10²⁰ Hz

Step 2: Find wavelength

3.0 × 10⁸ m/s = λ(2.73 × 10²⁰ Hz)

λ = 1.0989 × 10⁻¹² m

Step 3: Check

We are given 3 sig figs. Follow sig fig rules.

1.0989 × 10⁻¹² m ≈ 1.10 × 10⁻¹² m

Answer:

its definitely A

Explanation:

hope this helps

Answer:

CO2 + 2H2O

Explanation:

left side of the equation is the products side, right side is the reactant side

Answer:

Carbon Dioxide(CO2) and Water (H2O)

Explanation:

Whatever is on the right side of the equation is the products, the left side is the reactants.

Answer: They are chemically stable gases

Explanation:

Group 18 is also called the noble gases - because they have full valence shells it means they are stable and won't chemically react.

Answer:

backward, opposite, retrograde

Explanation:

why, i just got it right when i put that.

Answer:

here they are

Explanation:

Venus's rotation is backward compared to Earth's.

Venus's rotation is the opposite compared to Earth's.

Venus's rotation is retrograde compared to Earth's.

The Molarity of volumetric flask 1 : 1.26 M

The Molarity of volumetric flask 2 : 0.06 M

Dilution is a process of decreasing the concentration of a solution by adding a number of solvents

Can be formulated

M₁V₁=M₂V₂

M₁ = Initial Molarity

V₁ = Initial volume

M₂ = Final Molarity (after dilution)

V₂ = Final volume (after dilution)

Volume of volumetric flask = 500 ml

[tex]\tt M_1.V_1=M_2V_2\\\\9\times 0.07=M_2.0.5\rightarrow M_2=1.26[/tex]

[tex]\tt M_1.V_1=M_2V_2\\\\1.26\times 0.023=M_2\times 0.5\rightarrow M_2=0.06[/tex]

Answer:

B. Rabbits

For photosynthesis you need chlorophyll but rabbits don't have it.

pH=4.625

The classification of this sample of saliva : acid

The water equilibrium constant (Kw) is the product of concentration

the ions:

Kw = [H₃O⁺] [OH⁻]

Kw value at 25° C = 10⁻¹⁴

It is known [OH-] =  4.22 x 10⁻¹⁰ M

then the concentration of H₃O⁺:

[tex]\tt 10^{-14}=4.22\times 10^{-10}\times [H_3O^+]\\\\(H_3O^+]=\dfrac{10^{-14}}{4.22\times 10^{-10}}=2.37\times 10^{-5}[/tex]

pH=-log[H₃O⁺][tex]\tt pH=5-log~2.37=4.625[/tex]

Saliva⇒acid(pH<7)

Answer:

(A) A-(S) ; B-(R) ; C-(Q) ; D-(P).

Explanation:

(A)-S_ The male part of a flower.

(B)-R _The stalk of an anther.

(C)-Q_ The female structure of a flower.

(D)-P _The portion of the pistil recieving the pollen.

Answer: Fluorine has the highest ionization enthalpy.

Explanation: This is because the ionization energy decreases from top to bottom and increases from left to right. Also, ionization enthalpy is the amount of energy required by an isolated gaseous atom to lose an electron in its ground state.

Since fluorine needs just one atom to attain noble gas configuration so it will not want to lose any electron and hence a high amount of energy will be required to remove an electron from it.

Answer:

The answer is true.