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3 years ago

How to find density with radius, height, and mass.

1 answer:

4 0

The mass density ρ of an object may be found by dividing its mass M by its volume V. Sphere: V = (4/3) π R3 where R is the radius of the sphere. Cylinder: V = π R2L where R is the radius of its base and L the length of it.

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How will the addition of a catalyst affect the reaction rate of the chemical reaction?

Rina8888 [55]

Answer:

It will cause the reaction rate to increase.

3 0

3 years ago

Read 2 more answers

The following steps are unbalanced half-reactions involved in the nitrogen cycle. Balance each half-reaction to show the number

Vadim26 [7]

This is an oxidation reaction. The balanced equation is as follows:

6H₂O + N₂ → 2NO₃⁻+ 12H⁺ + 6e⁻

Rules to balance redox reaction in acidic medium

Write the given equation in ionic form
Identify elements undergoing oxidation ( charge increase, O.N inc) and reduction (charge dec, O.N dec)
Break the equation into two halfs
Balance the half equations

A. Balance all other atoms except Oxygen and hydrogen

B. Balance oxygen by adding H2O to the side deficient in oxygen

C. Balance hydrogen by adding H+ ions

D. Balance charge by adding electrons

5. Add the two half such that electrons gets cancelled

Oxidation number of N in N2 is 0 while in NO₃⁻, it is +5. Thus there is an increase in oxidation number, thus oxidation is taking place.

N₂(g) → NO₃⁻(aq)

balance N.

N₂ → 2NO₃⁻

balance O by adding H2O

6H₂O + N₂ → 2NO₃⁻

Now balance Hydrogen

6H₂O + N₂ → 2NO₃⁻+ 12H⁺

balance charge. 0 charge on left, -6 and + 12 on right. add 6e⁻ on right to balance.

6H₂O + N₂ → 2NO₃⁻+ 12H⁺ + 6e⁻

Thus we can conclude that since there is increase in oxidation number, oxidation is taking place.

learn more about balancing redox reactions at brainly.com/question/10203480

#SPJ4

3 0

1 year ago

You are asked to determine the identity of an unknown liquid and can measure only one physical property. You see the liquid and

Julli [10]

The physical property you measured is the boiling point of the liquid.

Therfore, if the liquid has a boiling point of 100°C, it turns from liquid state to vapor when you heat it up to 100°C.

To conclude, The liquid should be pure water. Because only pure water has a boiling point of 100°C, using this physical property, we can test whatever liquid ans see if it's pure water or not, this test is called the boiling point test.

5 0

2 years ago

Which of the following could be the rate equation for a first order reaction? please help this is timed

wel

Rate = k[A] = first order reaction

<h3>Further explanation</h3>

Given

Rate law

Required

A first-order reaction

Solution

The rate law : equation for the rate of chemical reaction

For reaction

aA + bB ⇒ C

The rate : r = k[A]ᵃ[B]ᵇ

The sum of exponents(a+b) is the reaction order

From the choice :

a. a+b = 2, second order reaction

b. a+b = 3, third order reaction

c. a+b = 4, fourth order reaction

d a+0 = 1, first order reaction

7 0

3 years ago

Si te comes un banano de 125 g, asumiendo que este es 100% potasio, calcula lo siguiente: Determina la cantidad de Kilocalorías

Bond [772]

Answer:

0.0179254 kilocalorías(0,0179254 kilocalorías.)

Explanation:

Paso 1

Encontramos la Energía Calórica del Plátano

Se nos dice que el plátano es 100% potasio, por lo tanto

Fórmula de energía térmica = MCΔT

Dónde

M = Masa de sustancia (gramos)

C = Calor específico (j / g ° c)

ΔT = Cambio de temperatura (Temperatura final - Temperatura inicial) (° C)

Masa de (plátano) potasio = 125g

Calor específico de potasio = 0,75j / g ° C

ΔT = Cambio de temperatura

= 37,3 ° C - 36,5 ° C

= 0,8 ° C

Calor específico del banano

Q = 125 g × 0,75j / g ° C × 0,8 ° C

Q = 75 julios

Por lo tanto, 125 gramos de potasio (plátano) contienen 75 julios de energía.

Paso 2

Convertimos Julios de energía en kilocalorías

1 julio = 0.000239006 kilocalorías

75 julios =

Cruz multiplicar

75 julios × 0.000239006 kilocalorías / 1 julio

= 0.0179254 kilocalorías.

Por tanto, 125 g de plátano contienen 0,0179254 kilocalorías.

3 0

2 years ago