WorksheetsChemistry B - 10.1: The Nucleus Quiz
Total questions: 25
Worksheet time: 13mins
What do nuclear reactions involve?
Energy from sound
Changes in the nucleus of atoms
Movement of molecules
Electron transfers only
What is the atomic number?
Mass number
Number of protons in a nucleus
Number of electrons
Number of neutrons
What is the mass number?
Number of neutrons
Sum of protons and neutrons
Atomic number only
Number of electrons
How many neutrons does H-3 have?
1
0
2
3
How many protons does C-14 have?
6
8
14
12
What are isotopes?
Different elements
Atoms with the same number of protons but different numbers of neutrons
Unstable molecules
Ions
What does H-1 represent?
Hydrogen with 1 neutron
Hydrogen with 1 proton and 0 neutrons
How is an isotope usually written?
Mass number only
Element name or symbol followed by mass number
Electron count and name
Atomic number first
What is the nucleus compared to the size of the electron cloud?
10 times smaller
About 10,000 times smaller
Larger than cloud
Same size
What is a neutron star?
A star of gas and plasma
A dense star composed only of neutrons
A type of galaxy
A black hole
Why are neutron stars so dense?
Made of iron
No electron clouds, only neutrons
Too many electrons
They have large volume
What force holds the nucleus together?
Weak nuclear force
Strong nuclear force
Gravity
Electromagnetic force
Which force explains electricity and magnetism?
Weak nuclear force
Electromagnetic force
Gravitational force
Strong nuclear force
Which force is responsible for nuclear decay?
Strong force
Weak nuclear force
What does E=mc represent?
Weight equation
Energy released from mass
Newton's law
Electric charge law
What is 'c' in E=mc?
Current
Charge
Speed of light squared
Mass in grams
What happens in nuclear changes compared to chemical changes?
Only electrons change
Nucleus changes and often forms new isotopes
Molecules ionize
Atoms evaporate
What type of energy does the Sun mainly produce?
Chemical energy
Nuclear energy
Gravitational energy
Mechanical energy
Why can't the Sun's energy come from chemical reactions?
They are not hot enough
Wouldn't produce enough energy for that long
They are too slow
They only occur in water
What trend is seen in stable isotopes?
No neutrons in large atoms
Larger atoms need more neutrons than protons
Equal protons and neutrons only
Fewer protons for all
How many stable isotopes exist?
1000
250
What makes an atom stable?
It glows
It rotates faster
It can't change without large energy input
It has no electrons
What does it mean if an atom is radioactive?
It becomes stable
It dissolves
It spontaneously emits energy or particles from the nucleus
It reacts with light
What is the significance of Po-84 to Og-294?
They are noble gases
They are light elements
They are stable metals
They are unstable in all forms
Why are isotopes important in nuclear chemistry?
They control color
They define how the nucleus changes in reactions
They help with bonding
They explain electron orbits
