The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements? A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons

Answers

Answer 1

Answer:

The correct answer is option B: Mg with 14 neutrons

The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.

Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.

The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.

The isotopes of magnesium are; 24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and 26Mg which has 14 neutrons.

Hence, the peak at 26amu represents 26Mg which has 14 neutrons.

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Answer 2

Answer:

Answer:

The answer is B

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Convert 338 L at 3.0 atm to its new volume at standard pressure. 1,014L

Answers

Answer:

1014 L

Explanation:

From the question,

Applying

PV = P'V'.................... Equation 1

Where P = initial pressure, P' = Final pressure, V = Initial volume, V' = Final volume

make V' the subject of the equation

V' = PV/P'........... Euqation 2

Given: P = 3 atm, V = 338L, P' = 1 atm (Standard pressure)

Substitute into equation 2

V' = (3×338)/1

V' = 1014 L

Hence the new volume is 1014 L

How many dots are shown in the electron dot diagram for calcium, element number 20?

Answers

2 dots are shown for drawing it. because it has two valence electrons

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?

Answers

Specific heat capacity is the required amount of heat per unit of mass in order to raise teh temperature by one degree Celsius. It can be calculated from this equation: H = mCΔT where the H is heat required, m is mass of the substance, ΔT is the change in temperature, and C is the specific heat capacity.

H = mCΔT
2501.0 = 0.158 (C) (61.0 - 32.0)

C = 545.8 J/kg·°C

f chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?

Answers

If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. The kind ofreaction that took place is decomposition reaction. Because sodium iodide is broken down into sodium and iodide atoms.

Why would an electrician use parallel circuits to wire the lights in each room of a house instead of using a series circuit?A.
When electricians get their license, they are only licensed to install parallel circuits. Most electricians aren't certified to install series circuits.

B.
Parallel circuits prevent electrons from flowing if part of the circuit is broken and therefore prevent fires. Series circuits cause more fires because electrons still flow.

C.
Electrons continue to flow in a parallel circuit even if part of the circuit is broken. In a series circuit, a break such as a burned out lightbulb would cause the current to stop in the whole room.

D.
Parallel circuits are much easier to wire and are required by the electrical code for housing construction in most communities. Series circuits are sometimes used with special approval.

Answers

C: Electrons continue to flow in a parallel circuit even if part of the circuit is broken. In a series circuit, a break such as a burned out lightbulb would cause the current to stop in the whole room!

2Mg + O2 --> 2MgO Magnesium is the oxidizing agent and is reduced oxidizing agent and is oxidized reducing agent and is reduced reducing agent and is oxidized