All categories

3 years ago

In what kind of reaction do two or more substances combine to form a new compound

Chemistry

1 answer:

Misha Larkins [42]3 years ago

4 0

Answer:

Combination or synthesis

Explanation:

In combination or synthesis, there is formation of a single product from two or more reactants e.g:

H₂ + I₂ → 2HI

Here a compound forms from the association of the consituent elements.

Other kinds of chemical reactions we have are:

Decomposition or cracking
Single replacement or single displacement
Double replacement or double decomposition or metathesis.

You might be interested in

The longer the bond, the smaller the bond enthalpy. the longer the bond, the smaller the bond enthalpy. false true

Temka [501]

True

As the shorter the bond, the stronger it is hence more energy will be required to overcome this bond

5 0

3 years ago

The rate constant k for a certain reaction is measured at two different temperatures temperature 376.0 °c 4.8 x 108 280.0 °C 2.3

9966 [12]

Answer:

The activation energy for this reaction = 23 kJ/mol.

Explanation:

Using the expression,

$\ln \dfrac{k_{1}}{k_{2}} =-\dfrac{E_{a}}{R} \left (\dfrac{1}{T_1}-\dfrac{1}{T_2} \right )$

Where,

$k_1\ is\ the\ rate\ constant\ at\ T_1$

$k_2\ is\ the\ rate\ constant\ at\ T_2$

$E_a$ is the activation energy

R is Gas constant having value = 8.314×10⁻³ kJ / K mol

$k_2=2.3\times 10^8$

$T_2=280\ ^0C$

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T = (280 + 273.15) K = 553.15 K

$T_2=553.15\ K$

$k_1=4.8\times 10^8$

$T_1=376\ ^0C$

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T = (376 + 273.15) K = 649.15 K

$T_1=649.15\ K$

So,

$\left(\ln \left(\:\frac{4.8\times \:\:\:10^8}{2.3\times \:\:\:10^8}\right)\right)\:=-\frac{E_a}{8.314\times \:10^{-3}\ kJ/mol.K}\times \:\left(\frac{1}{649.15\ K}-\frac{1}{553.15\ K}\right)$

$E_a=-\frac{10^{-3}\times \:8.314\ln \left(\frac{10^8\times \:4.8}{10^8\times \:2.3}\right)}{-\frac{96}{359077.3225}}\ kJ/mol$

$E_a=-\frac{\frac{8.314\ln \left(\frac{4.8}{2.3}\right)}{1000}}{-\frac{96}{359077.3225}}\ kJ/mol$

$E_a=22.87\ kJ/mol$

<u>The activation energy for this reaction = 23 kJ/mol.</u>

6 0

2 years ago

Which of these activities performed by a chemist is primarily based on an understanding of physics?

Ilia_Sergeevich [38]

<span>predicting the boiling point of a liquid, given its pressure</span>

8 0

3 years ago

What is the oxidation number of s in na2s4o6?

Novosadov [1.4K]

Answer:

+2.5

Explanation:

So the oxidation number of S in Na2S4O6is +2.5.

7 0

3 years ago

Read 2 more answers

Under standard conditions, which of the following is the net reaction that occurs in the cell? Cd | Cd2+ | | Cu2+ | Cu

dlinn [17]

Answer:

Cd + Cu2+ -----> Cu + Cd2+

Explanation:

6 0

2 years ago