TES PENGETAHUAN: LAJU REAKSI

Perubahan konsentrasi reaktan atau produk per satuan waktu adalah...

• mol

• molalitas

• laju reaksi

• konsentrasi

Answer explanation

The rate of reaction is the change in concentration of reactants or products per unit time.

Banyaknya mol zat terlarut per satuan waktu adalah...

• mol

• molaritas

• fraksi mol

• volume molar

Answer explanation

The rate at which moles of solute are dissolved per unit time is called molar concentration. In this case, molaritas is the correct choice as it represents the concentration of a solute in a solution.

Sebanyak 10 gram NaOH (Mr = 40) dilarutkan dalam 2 liter akuades. Molaritas NaOH adalah.... M

• 0,010

• 0,125

• 0,150

• 0,250

Answer explanation

The molarity of NaOH is calculated by dividing the number of moles of NaOH by the volume of the solution in liters. In this case, we have 10 grams of NaOH and a volume of 2 liters. The molar mass of NaOH is 40 g/mol. Therefore, the number of moles of NaOH is 10/40 = 0.25 moles. Dividing this by the volume of the solution, we get a molarity of 0.125 M. Therefore, the correct answer is 0.125.

16,9 gram H₂SO₄ pekat dilarutkan dalam 200 ml akuades. Jika massa jenis H₂SO₄= 1,225 g/ml dan Mr H₂SO₄=98 g/mol maka konsentrasi larutan H₂SO₄ adalah... M

• 0,15

• 0,25

• 1,06

• 1,25

Answer explanation

The concentration of the H2SO4 solution is 1.06 M. This is calculated by dividing the mass of H2SO4 by its molar mass and volume of the solution.

Reaksi yang berlangsung paling cepat terjadi pada proses....

• pembusukan sampah

• pematangan buah

• pembentukan fosil menjadi minyak bumi

• terbakarnya kembang api

Answer explanation

The fastest reaction occurs during the burning of fireworks.

Orde reaksi total untuk reaksi tersebut adalah...

• 1

• 2

• 3

• 4

Answer explanation

The total reaction order for the given reaction is 2, as indicated by the correct answer choice.

Diketahui reaksi: 2NO + O₂ --> NO₂ sehingga rumus laju reaksi pda percobaan tersebut adalah v=k.[NO]².[O2]. Jika harga k=125, [NO]= 2.10^-3 M dan [O₂]= 3.10^-3 M, maka laju reaksi untuk persamaan tersebut adalah.... M/detik

• 15.10^-6

• 3.10^-6

• 2.10^-6

• 1.10^-6

Answer explanation

The rate of reaction for the given equation is 15.10^-6 M/s. This is calculated using the given values of k, [NO], and [O2] in the rate equation.

Rumus laju reaksi untuk percobaan tersebut adalah....

• v= k. [H₂] [NO]

• v= k. [H₂]² [NO]

• v= k. [H₂] [NO]²

• v= k. [H₂]² [NO]²

Answer explanation

The reaction rate formula for the given experiment is v = k. [H2] [NO]^2. This formula indicates that the rate of reaction is directly proportional to the concentration of H2 and the square of the concentration of NO. Therefore, the correct choice is v = k. [H2] [NO]^2.

Harga X pada eksperimen tersebut adalah....

• 20

• 24

• 36

• 42

Answer explanation

The correct answer is 24 because it is the only choice that matches the given information.

Answer explanation

The reaction rate decreases by a factor of 16 when the concentration of A decreases by 1/4, indicating that the correct choice is (3/16)k.