What is a firedamp? A. a blanket-like object used to extinguish fires B. the remnants of a fire after it has been extinguished C. a fire extinguisher that uses water to extinguish a fire D. a buildup of mostly methane gas, which is potentially explosive

Answers

Answer 1

Answer:

Answer: D. A buildup of mostly methane gas, which is pontentially explosive.

Explanation:

Firedamp refers to a gas mixture, largely methane, that appear in underground coal mines. It is explosive at concentrations between 5 and 10% in the air.

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Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe): 2H2O2(aq) ---> 2H2O(l) + O2(g)What volume of pure O2(g), collected at 27C and 746 torr, would be generated by decomposition of 125 g of a 50.0% by mass hydrogen peroxide solution?

Answers

Answer:

23.0733 L

Explanation:

The mass of hydrogen peroxide present in 125 g of 50% of hydrogen peroxide solution:

$Mass=\frac {50}{100}* 125\ g$

Mass = 62.5 g

Molar mass of $H_2O_2$ = 34 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

Thus, moles are:

$moles= (62.5\ g)/(34\ g/mol)$

$moles= 1.8382\ mol$

Consider the given reaction as:

$2H_2O_2_((aq))\rightarrow2H_2O_((l))+O_2_((g))$

2 moles of hydrogen peroxide decomposes to give 1 mole of oxygen gas.

Also,

1 mole of hydrogen peroxide decomposes to give 1/2 mole of oxygen gas.

So,

1.8382 moles of hydrogen peroxide decomposes to give $\frac {1}{2}* 1.8382 mole of oxygen gas. Moles of oxygen gas produced = 0.9191 molGiven: Pressure = 746 torrThe conversion of P(torr) to P(atm) is shown below:[tex]P(torr)=\frac {1}{760}* P(atm)$

So,

Pressure = 746 / 760 atm = 0.9816 atm

Temperature = 27 °C

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

T(K) = T( °C) + 273.15

So,

T₁ = (27 + 273.15) K = 300.15 K

Using ideal gas equation as:

PV=nRT

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

0.9816 atm × V = 0.9191 mol × 0.0821 L.atm/K.mol × 300.15 K

⇒V = 23.0733 L

The tendency of an element to react is closely related toa. its atomic mass.
b. attractions between its atoms.
c. the number of valence electrons in atoms of the element.
d. the ratio of protons to neutrons in atoms of the element

Answers

The tendency of an element to react is closely related to the number of valence electrons in atoms of the element (answer C).

Explanation

Valence electrons are outer shell electrons of an atom.They govern the bonding behavior of an element.

when element react to form compound, valence electron are involved.

Valence electrons are involved in a reaction either by sharing among atoms or may be transferred from one atom to another.

For example in formation of NaCl bond there is transfer of valence electron between Na and Cl. Na donate 1 valence electron while Cl accept 1 electron to form NaCl

Answer: c. the number of valence electrons in atoms of the element

The valence electrons determine how it would bond and if it would react.

Which type of heat transfer can cause the butter to melt?A. Convection
B. Conduction
C. Radiation
D. Heat

Answers

Answer:

radiation

LOL but also heat

Explanation:

hope this helps

Igneous rocks with an andesitic composition ________.

Answers

are found along volcanic island arcs

Which statement is NOT TRUE about elements in group 16?a. They need two electrons to complete their octet.
b. They have an oxidation number of 2-
c. They have an oxidation number of 2+
d. The have six valence electrons.

Answers

All the statement is true about the elements of group 16.

What is Groups and Periods in Periodic table ?

In periodic table 18 vertical column are present which is called groups which are arranged from left to right in the periodic table.

In periodic table 7 horizontal rows are present which is called periods.

Now lets check all options one by one.

Option (A): They need two electrons to complete their octet.

In periodic table Group sixteen have 6 elements in its valence shell. Group 16 elements needed two electrons to complete the octet valency. The valency of group 16 elements is 2. So it is true about the group 16 elements.

Hence, it is incorrect option.

Option (B): They have an oxidation number of 2-

Group 16 show variable oxidation state that is -2, +2, +4 and +6. So the statement is true.

Hence it is incorrect option.

Option (C): They have an oxidation number of 2+.

Group 16 show variable oxidation state that is -2, +2, +4 and +6. So the statement is true.

Hence it is incorrect option.

Option (D): They have six valence electrons

Group 16 elements are called Chalcogens. They have 6 valence electron so they achieve noble gas configuration. So it is true statement.

Hence, it is incorrect option.

Thus, from the above conclusion we can say that all the statement is true about the elements of group 16.

Learn more about the Group 16 elements here: brainly.com/question/19965333
#SPJ2

The most suitable answer is C becuase they would gain two elctrons to atain that stable OCTET thus becoming a anion with a charge of -2 and by virtue oxidation states of -2. There is however an exception with oxygen in two cases. But I still remain that the best answer would be C

How many grams of oxygen are required to react with 10.0 grams of octane

Answers

are their any choice ?

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Atoms A and X are fictional atoms. Suppose that the standard potential for the reduction of X^2+ is +0.51 V, and the standard potential for the reduction of A^2+ is -0.33. Find the standard potential for an electrochemical cell with the cell reaction that follows.

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