All categories

3 years ago

10. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by

Chemistry

2 answers:

damaskus [11]3 years ago

8 0

Answer:

it would be an element because its an element

Explanation:

vfiekz [6]3 years ago

7 0

It’s element it’s correct

You might be interested in

The following reaction can be written as the sum of two reactions, one of which relates to ionization energy and one of which re

Karo-lina-s [1.5K]

A)
First ionization energy of Li:
Li(g) + 520 kJ/mol → Li⁺(g) + e⁻

B)
Electron affinity of Fluorine:
F(g) + e⁻ → F⁻(g) + 328 kJ/mol

8 0

3 years ago

Kemmi Major does some experimental work on the combustion of sucrose: C12H22O11(s) 12 O2(g) → 12 CO2(g) 11 H2O(g) She burns a 0.

Pavlova-9 [17]

Answer: $5.81\times 10^6J/mol$

Explanation:

Heat of combustion is the amount of heat released when 1 mole of the compound is completely burnt in the presence of oxygen.

$C_{12}H_{22}O_{11}(s)+12O_2\rightarrow 12CO_2(g)+11H_2O(g)$

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{0.05392g}{342g/mol}=1.577\times 10^{-4}moles$

Thus $1.577\times 10^{-4}moles$ of sucrose releases = 916.6 J of heat

1 mole of sucrose releases = $\frac{916.6}{1.577\times 10^{-4}}\times 1=5.81\times 10^6J$ of heat

Thus ∆H value for the combustion reaction is $5.81\times 10^6J/mol$

6 0

4 years ago

Hydroboration can occur when alkenes react with borane. Borane is highly unstable so it exists as diborane or is stabilized with

weeeeeb [17]

Hydroboration addition of borane to a compound across the double bond.

<h3>What is hydroboration?</h3>

The reaction that is called hydroboration could be carried out with an alkene or an alkyne as the case maybe. In each case, the reaction involves the addition of borane to a compound across the double bond. The reaction could further proceed to produce an alkanol.

Let us restate that like most of the organic reactions, this reaction occurs in a sequence of steps and each step of the reaction has a way of bringing us closer to the end product of the entire steps of the reaction take in proper order

As shown in the image attached to this answer, the reaction was carried out in DMS in order to stabilize the borane. We have shown the borane to be a reactant as it adds across the double bond to yield the product.

Learn more about hydroboration:brainly.com/question/11655454

#SPJ1

6 0

2 years ago

What is the difference between metals and non metals on the periodic table

Vilka [71]

Answer:

On the periodic table, metals are separated from nonmetals by a zig-zag line stepping through carbon, phosphorus, selenium, iodine, and radon. ... Elements just to the left of the line may be termed metalloids or semimetals and have properties intermediate between those of the metals and nonmetals.

Explanation:

3 0

3 years ago

How would you convert 2930 kcal to kJ?

andrezito [222]

It is quite easy:

1 cal = 4,1868 J

Solution is:

2930 kcal = 4,1868 * 2930 [kJ] = 12267,324 [kJ]

8 0

3 years ago