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3 years ago

Can covalent compounds usually dissolve in water? *

Chemistry

1 answer:

geniusboy [140]3 years ago

8 0

Answer:

Explanation:

Covalent Compounds in Water. When covalent compounds dissolve in water they break apart into molecules, but not individual atoms. Water is a polar solvent, but covalent compounds are usually nonpolar. This means covalent compounds typically don't dissolve in water, instead making a separate layer on the water's surface

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The decomposition of hydrogen peroxide, H2O2, has been used to provide thrust in the control jets of various space vehicles. Usi

lesantik [10]

Answer:

$\Delta H^0 _{reaction} = - 54.04 \ kJ/mol$

Explanation:

The given equation for the chemical reaction can be expressed as;

$2H_2O_{(l)} \to 2H_2O_{(g)} + O_{2(g)}$

Using Hess Law to determine how much heat is produced by the decomposition of exactly 1 mole of H2O2 under standard conditions; we have the expression showing the Hess Law as follows:

$\Delta H^0 _{reaction} = \sum n* \Delta H^0 _{products} - \sum n* \Delta H^0 _{reactants}$

At standard conditions;

the molar enthalpies of the given equation are as follows:

$\Delta H_2O_{(g)} =-241.82\ kJ/mol$

$\Delta H_ O_{2(g)} = 0 \ kJ/mol$

$\Delta H _{H_2O_{(l)}}= -187.78 \ kJ/mol$

Replacing them into above formula; we have:

$\Delta H^0 _{reaction} = (2*(-241.82\ kJ/mol) + 0 \ kJ/mol + (2 *(-187.78 \ kJ/mol))$

$\Delta H^0 _{reaction} =-108.08 \ kJ/mol$

The above is the amount of heat of formation for two moles of hydrogen peroxide; thus for 1 mole hydrogen peroxide ; we have :

$\Delta H^0 _{reaction} = \dfrac{-108.08 \ kJ/mol}{2}$

$\Delta H^0 _{reaction} = - 54.04 \ kJ/mol$

Hence; the heat produced after the decomposition of 1 mole of hydrogen peroxide is -54.04 kJ/mol

6 0

4 years ago

Q2. Name, constituent of petroleum (Petrochemicals) which is used for following purposes.

finlep [7]

The constituents of petroleum that are used for the following purposes are as follows:

To make candles ----- Paraffin wax
A solvent for dry cleaning ----- Petrol
For surfacing roads ----- Bitumen
Jet engine fuel ----- Kerosene
For lubrication ----- Lubricating oil.

<h3>What are the constituents of petroleum?</h3>

The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.

Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.

To learn more about constituents of petroleum, refer to the link:

brainly.com/question/17023299

#SPJ1

7 0

2 years ago

How many significant figures are in the measurement 81,140 grams

GrogVix [38]

Answer:

Explanation:

In order to be able to say how many sig figs are used for the measurement 811.40 g, you need to know that

non-zero digits are always significanta trailing zero that follows a decimal point and a non-zero digit is always significant

In your case, the measurement

811.40

has four non-zero digits and one significant trailing zero.

8,1,1,4→ non-zero digits8,1,1,0→ significant trailing zero

Therefore, you can say that this measurement has five significant figures

811.40→ five significant figures

8 0

3 years ago

How many sulfur atoms are there in 5.52 mol of sulfur

PSYCHO15rus [73]

Moles * Avogadro constant = 5.52 * 6.022 x 10^23

6 0

3 years ago

Read 2 more answers

What is the right answer?

valkas [14]

SORRY BUT ITS BLUR:) HUHU

5 0

3 years ago