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A-Level Chemistry > Module 2 chapter 2- Foundations In Chemistry > Flashcards

Module 2 chapter 2- Foundations In Chemistry Flashcards

1
Q

Explain what is meant by the term relative atomic mass of an element

A

The weighted mean mass of an atom compared with 1/12th the mass of one atom of carbon-12

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2
Q

Which statement is not correct for Group 2 metals?
A. An unpaired electrons is present in an s orbital
B. Chemical reactivity increases with increasing atomic number
C. the first ionisation energy decreases with increasing atomic number
D. Atomic radius increases with increasing atomic number

A

A

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3
Q

What is meant by the term isotopes?

A

Atoms of an element with different number of neutrons and same number of protons

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4
Q

Different isotopes of antimony have the same chemical properties.
Explain Why

A

They have the same number of electrons in the outer shell

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5
Q

How to work out protons, electrons and neutrons

A 
Protons = Atomic Number 
Electrons = Atomic Number 
Neutrons = Mass Number - Atomic Number
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6
Q

State the similarities and differences between the atomic structure of isotopes of the same element.

A

similarities - same number of protons and electrons

differences - different number of neutrons

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7
Q

Explain why a small proportion of molecules in water have a relative molecular mass of 20

A

Different O/H isotopes are present

D2O

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8
Q

Most elements contain different isotopes

State 2 differences between isotopes of the same element

A

Different physical properties

Different number of neutrons

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9
Q

How does a mass spectroscopy work?

A

sample is vaporised - gas form
Stage 1 - ionisation , an electron gun is used
Stage 2 - Acceleration - ion is excited/accelerated
Stage 3 - Deflection - the ion with more charge and less mass will deflect more
Stage 4 - Detection - Reaches the detector to produce a mass/charge ratio and produces a graph

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10
Q

What is the x and y axis for a mass spectrometer

A

Y axis - % Abundance

X axis - Mass to charge ratio

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11
Q

Describe the function of a mass spectrometer

A

It identify molecules and shows isotopes

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12
Q

What is the formula for ammonium

A

NH4 +1

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13
Q

What is the formula for hydroxide

A

OH-

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14
Q

What is the formula for Nitrate

A

NO3-

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15
Q

What is the formula for Nitrite

A

NO2-

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16
Q

What is the formula for hydrogen carbonate

A

HCO3-

17
Q

What is the formula for Manganate(VII)

A

MnO4

18
Q

What is the formula for carbonate

A

CO3 2-

19
Q

What is the formula for sulfate

A

SO4 2-

20
Q

What is the formula for sulfite

A

SO3 2-

21
Q

What is the formula for dichromate

A

Cr2O7 2-

22
Q

What is the formula for phosphate

A

PO4 3-

23
Q

What is relative isotopic mass

A

The mass of an isotope relative to 1/12th of the mass of an atom of carbon 12

A-Level Chemistry (23 decks)

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