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2 years ago

Adding vinegar to baking soda will cause a chemical reaction. Which of these will speed up the reaction?

1 answer:

7 0

When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.

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The decomposition of HBr(g) into elemental species is found to have a rate constant of 4.2 ×10−3atm s−1. If 2.00 atm of HBr are

Dennis_Churaev [7]

Answer:

7,94 minutes

Explanation:

If the descomposition of HBr(gr) into elemental species have a rate constant, then this reaction belongs to a zero-order reaction kinetics, where the reaction rate does not depend on the concentration of the reactants.

For the zero-order reactions, concentration-time equation can be written as follows:

[A] = - Kt + [Ao]

where:

[A]: concentration of the reactant A at the t time,
[A]o: initial concentration of the reactant A,
K: rate constant,
t: elapsed time of the reaction

To solve the problem, we just replace our data in the concentration-time equation, and we clear the value of t.

Data:

K = 4.2 ×10−3atm/s,

[A]o=[HBr]o= 2 atm,

[A]=[HBr]=0 atm (all HBr(g) is gone)

We clear the incognita :

[A] = - Kt + [Ao]............. Kt = [Ao] - [A]

t = ([Ao] - [A])/K

We replace the numerical values:

t = (2 atm - 0 atm)/4.2 ×10−3atm/s = 476,19 s = 7,94 minutes

So, we need 7,94 minutes to achieve complete conversion into elements ([HBr]=0).

6 0

3 years ago

What approximate percentage of the Earth’s freshwater is groundwater?

grigory [225]

the answer is c.) 30%

4 0

3 years ago

Read 2 more answers

Y = 57.15 − 0.5 X If Y equals 5 , what is X ? Then is Y=3, what is X?

Fiesta28 [93]

When y equals 5, x is 104.3

When y equals 3 then x is 108.3

Solution:

Given expression is:

$y = 57.15 - 0.5x$

<h3>If y equals 5 what is x ?</h3>

Substitute y = 5 in given expression

5 = 57.15 - 0.5(x)

5 = 57.15 - 0.5x

0.5x = 57.15 - 5

0.5x = 52.15

Divide both sides by 0.5

x = 104.3

Thus when y equals 5, x is 104.3

Substitute y = 3 in given expression

3 = 57.15 - 0.5(x)

3 = 57.15 - 0.5x

0.5x = 57.15 - 3

0.5x = 54.15

Divide both sides by 0.5

x = 108.3

Thus when y equals 3 then x is 108.3

7 0

3 years ago

Calcula la densidad de un cuerpo que tiene la masa de 12g y un volumen de 3cm^3 dar el resultado en unidades del SI

kvv77 [185]

The density is 4 g/cm³ or 4000 kg/m³.

Density = mass/volume = 12 g/3 cm³ = 4 g/cm³

The measurement of 4 g/cm³ is already in SI units.

In SI base units,

Density = (4 g/1 cm³) × (1 kg/1000 g) × (100 cm/1 m)³ = 4000 kg/m³

3 0

3 years ago

PLEASE ANSWER FAST

Elis [28]

First we need to calculate the number of moles of FeS $_{2}$ :

number of moles = mass (grams) / molecular mass (g/mol)

number of moles of FeS $_{2}$ = 198.2/120 = 1.65 moles

From the chemical reaction we deduce that:

if 4 moles of FeS $_{2}$ produces 8 moles of SO $_{2}$

then 1.65 moles of FeS $_{2}$ produces X moles of SO $_{2}$

X = (1.65×8)/4 = 3.3 moles of SO $_{2}$

Now we can calculate the mass of SO $_{2}$ :

mass (grams) = number of moles × molecular mass (grams/mole)

mass of SO $_{2}$ = 3.3×64 = 211.2 g

7 0

3 years ago