闪卡自测
What is the mass and charge of a proton?
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闪卡 1
问题
What is the mass and charge of a proton?
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答案
A proton has a relative mass of 1 and a charge of +1.
闪卡 2
问题
True or False? All atoms of the same element have the same number of protons.
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答案
True. All atoms of the same element have the same number of protons.
闪卡 3
问题
What is the mass and charge of an electron?
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答案
An electron has a negligible mass and a charge of -1.
闪卡 4
问题
Define atomic number.
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答案
Atomic number is the number of protons in the nucleus of an atom.
闪卡 5
问题
What information does the mass number give?
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答案
The mass number is the total number of protons and neutrons in the nucleus of an atom.
闪卡 6
问题
What is an isotope?
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答案
An isotope is an atom of the same element with:
闪卡 7
问题
Which subatomic particles are in the nucleus of an atom?
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答案
The subatomic particles in the nucleus of an atom are protons and neutrons.
闪卡 8
问题
How do you calculate the number of neutrons in an atom?
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答案
To calculate the number of neutrons in an atom:
闪卡 9
问题
What is a molecule?
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答案
A molecule is a group of two or more atoms held together by chemical bonds.
闪卡 10
问题
True or False? Atoms are made of subatomic particles.
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答案
True. Atoms are made of subatomic particles including protons, neutrons, and electrons.
闪卡 11
问题
Define relative atomic mass.
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答案
Relative atomic mass is:
闪卡 12
问题
Which subatomic particle has a mass of 1 and a charge of 0?
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答案
The subatomic particle with a mass of 1 and a charge of 0 is the neutron.
闪卡 13
问题
How do you determine the number of electrons in an atom?
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答案
The number of electrons in an atom is the same as the number of protons / the atomic number.
闪卡 14
问题
Calculate the number of protons, neutrons and electrons in an atom of .
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答案
The number of protons, neutrons and electrons in an atom of are:
闪卡 15
问题
State two pieces of information required to calculate the relative atomic mass of an element.
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答案
Two pieces of information required to calculate the relative atomic mass of an element are:
闪卡 16
问题
State the equation for Ar in terms of the percentage abundance and mass of isotopes A and B.
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答案
The equation for calculating relative atomic mass in terms of the percentage abundance and mass of isotopes A and B is:
闪卡 17
问题
True or False? The relative atomic mass of an element can be calculated using the atomic numbers and relative abundances of all its isotopes.
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答案
False. The relative atomic mass of an element is calculated using the mass numbers and relative abundances of all its isotopes.
闪卡 18
问题
In terms of isotopes, what is abundance?
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答案
In terms of isotopes, abundance is the amount of each isotope present in a sample of an element.
闪卡 19
问题
Which of the following are isotopes?
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答案
The isotopes are and . is not an isotope because it is a different element (nitrogen not carbon).
闪卡 20
问题
True or False? Relative atomic mass is calculated by adding the mass numbers of all isotopes.
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答案
False. Relative atomic mass is calculated by:
闪卡 21
问题
How can you recognise isotopes from their chemical symbol?
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答案
Isotopes have the same symbol and same atomic numbers but different mass numbers.
闪卡 22
问题
After calculating the Ar, how would you identify an element?
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答案
After calculating the Ar, you would identify an element by looking for the value on the Periodic Table. For example, Ar = 23. On the Periodic Table, the element with an Ar of 23 is sodium.
闪卡 23
问题
Calculate the relative atomic mass of an element using this information about its isotopes:
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答案
The relative atomic mass of the element is: = 69.8 or 70