40 Points Need help ASAP

Step 1: Separate the whole reaction into two half-reactions

HCOOH → CO2 MnO4- → Mn2+

Step 2: Balance the non-hydrogen and non-oxygen elements first

HCOOH → CO2 MnO4- → Mn2+

(C is balanced) (Mn is balanced)

Step 3: Balance oxygen by adding H2O(l) to the side that needs oxygen (1 O : 1 H2O)

HCOOH → CO2 MnO4- → Mn2+ + 4H2O

Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)

HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O

Step 5: Balance the charges: add electrons to the more positive side (or less negative side)

HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O

Reactants Products Reactants Products

HCOOH = 0 2H+ = +2 8H+ =+8 Mn2+ =+2

__MnO4- = -1________________________

Overall = 0 +2 +7 overall = +2

+2e- +5e-

0 +2

Step 6: Balance electrons on the two half-reactions

5[HCOOH → CO2 + 2H+ +2e-]

2[5e- + 8H+ + MnO4- → Mn2+ + 4H2O]

5HCOOH → 5CO2 + 10H+ + 10e-

10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O

Step 7: Get the overall reaction by adding the two reaction.

5HCOOH → 5CO2 + 10H+ + 10e-

10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O

5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2

Balanced Redox Reaction:

5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2

Answer:

Open ended question

Explanation:

Built different :]

Answer:

if an OPEN end question is too challenging respondents will abandon the surevy

Explanation:

Answer:

True

Explanation:

Noble gases already have the maximum number of valence electrons they can hold so they are the only stable group

Answer:

D

Explanation:

magnesium always lose 2 electrons

Answer:

7.3 x 10¹⁴Hz

Explanation:

Given parameters:

Wavelength  = 4.105 x 10⁻⁷m

Unknown:

Frequency of the light  =?

Solution:

The frequency, wavelength and speed of a wave are related using the expression below;

           C = f λ

C is the speed of light = 3 x 10⁸

f is the frequency

λ is the wavelength

      3 x 10⁸ = f x 4.105 x 10⁻⁷

              f  = [tex]\frac{3 x 10^{8} }{4.105 x 10^{-7} }[/tex]   = 7.3 x 10¹⁴Hz

Answer:

7.3 x 10¹⁴Hz

Explanation:

Answer:

The body-centred cubic (bcc) structure is the most stable form for sodium metal at 298 K (25°C). Under normal conditions, all of the Group 1 (alakali metals) elements are based upon the bcc structure. The closest Na-Na separation is 372 pm implying a sodium metallic radius of 186 pm.

Explanation:

Answer:

Ethanol + Potassium Permanganate + Sulfuric Acid = Acetic Acid + Manganese(II) Sulfate + Water + Potassium Sulfate

Explanation:

Answer:

the 4s subshell is lower in energy than the 3d subshell

Explanation:

In the element number 24 which is chromium

the electronic configuration should be according to Aufbau principle

will be  = [tex]1s^22s^22p^63s^23p^64s^23d^4[/tex]

but in reality it is = [tex]1s^22s^22p^63s^23p^64s^13d^5[/tex]

The 6 electrons in the outermost shell will be divided as 5 in 3d subshell and 1 in 4s shell, because half filled orbital [tex]4s^13d^5[/tex] will be more stable than [tex]4s^23d^4[/tex].

Answer:

2.13 atm

Explanation:

Answer:

A :metallic

B :conducts electricity as a solid

C :covalent

D :does not conduct electricity

Explanation:

Answer:

A = ✔ metallic

B = ✔ conducts electricity as a solid

C = ✔ covalent

D = ✔ does not conduct electricity

Explanation:

edge 2023

Explanation:

Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.

Answer:

Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.

Answer:

9146

Explanation:

Answer:

9146

Explanation:

9146

Answer:

11. physical

19. chemical

10. chemical

12. physical

18. chemical

Explanation:

that should be right, I'm not exactly sure though

Answer:

Explanation:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Answer:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Explanation:

Answer:

λ =  521nm

Explanation:

To convert wavelength to frequency we need to use the equation:

ν = c / λ

Where ν is frequency: 5.76x10¹⁴s⁻¹;

c is speed of light: 3x10⁸ms⁻¹;

And λ is wavelength in m:

Wavelength is:

λ = c / ν

λ = 3x10⁸ms⁻¹ / 5.76x10¹⁴s⁻¹

λ = 5.21x10⁻⁷m

= 521nm

The wavelength of a photon of green light that has a frequency (v) of 5.76x10¹⁴ s-¹ is 5.21 × 10-⁷m

HOW TO CALCULATE WAVELENGTH:

λ = v/f

Where;

λ = 3 × 10⁸ ÷ 5.76 x 10¹⁴

λ = 3/5.76 × 10⁸-¹⁴

λ = 0.521 × 10-⁶

λ = 5.21 × 10-⁷m

Learn more at: https://brainly.com/question/19601903?referrer=searchResults

Answer:

b

Explanation:

it i b ur welcome

Answer: um sure so 2+4= 24 then 9+7=97

Explanation: bc if you have 2 and you have 4 and if you smash that together you get 24 and 9 and 4 smash that together and you get 94 see so easy

Answer:

As electrons are added to the valence shell, an extra proton (i.e fundamental, positively charged nuclear particle) is added to the element's nucleus. As electrons add and Z the atomic number increases 1 by 1, nuclear charge WINS, and electronic radii contract.

Explanation:

Hope this helps you

Crown me as brainliest:)

Answer: fluprine

Hope this help

Answer/Explanation:

Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:

Fluorine (F)

Chlorine (Cl)

Bromine (Br)

Iodine (I)

Astatine (At)

Tennessine (Ts)

Hydrogen (H) is a nonmetal

Oxygen (O) is a nonmetal

Lithium (Li) is an alkaline metal.

Answer/Explanation:

Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:

Fluorine (F)

Chlorine (Cl)

Bromine (Br)

Iodine (I)

Astatine (At)

Tennessine (Ts)

Hydrogen (H) is a nonmetal

Oxygen (O) is a nonmetal

Lithium (Li) is an alkaline metal.

Answer:

0.03g

Explanation:

Given parameters:

Number of moles of Na = 0.00125mole

Unknown:

Mass in grams of Na = ?

Solution:

To find the mass of this substance, we simply multiply the number of moles with the given molar mass of Na.

 Mass of Na  = number of moles x molar mass

 Mass of Na  = 0.00125 x 23   = 0.03g

Answer: a mixture

Explanation:

Answer:

B: nuclear energy.

Explanation:

It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.

Hope that helps!

Answer:

mars

Explanation:

just googled it

In addition to Earth, mars  planet has evidence of water on the surface.

Evidence proves that financing results  works Our strong evidence based on the  proves that more lives and real can be changed through access to affordable inventing  for water and sanitation.

Evidence of finding water on Mars first to be known  in 2000, with the appearance of gullies that suggested us about  a liquid origin. Their formation has been hotly in  debated over the ensuing years.

Therefore, addition to Earth, mars  planet has evidence of water on the surface.

Learn more about  evidence of water, here:

https://brainly.com/question/3406927

#SPJ6

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{140}{6} = \frac{70}{3} \\ = 23.3333...[/tex]

We have the final answer as

Hope this helps you

Answer:

0.625mol/L

Explanation:

Given parameters:

Number of moles of solute = 5moles

Volume of solvent = 8L

Unknown:

Molarity = ?

Solution:

Molarity is the number of moles of solute per unit volume of solution. It is mathematically expressed as

  Molarity  = [tex]\frac{number of moles }{Volume}[/tex]  

  Molarity  = [tex]\frac{5}{8}[/tex]   = 0.625mol/L

Answer:

Explanation:

NaClO3

Atomic masses:

Na =23

Cl=35.5

O=16

Molar mass=(23)+(35.5)+(3×16) =106.5g/mol

Answer: 116.15 g/mol