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Question 1

A)The element radium has a mass number of 226 and an atomic number of 88. How many neutrons does an atom of radium have?(1 point)
Responses

226
226

314
314

138
138

88
88
Question 2
A)Which phrase describes transmutation?(1 point)
Responses

the conversion of energy to matter through chemical changes
the conversion of energy to matter through chemical changes

the conversion of protons to neutrons through nuclear changes
the conversion of protons to neutrons through nuclear changes

the conversion of one substance to another through chemical changes
the conversion of one substance to another through chemical changes

the conversion of an atom of one element into a different element through nuclear changes
the conversion of an atom of one element into a different element through nuclear changes
Question 3
A)Which statement about the balanced equations for nuclear and chemical changes is correct? (1 point)
Responses

Both are balanced according to the number of atoms of each element before and after the change.
Both are balanced according to the number of atoms of each element before and after the change.

Both are balanced according to the total mass before and after the change.
Both are balanced according to the total mass before and after the change.

A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.
A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.

A chemical equation is balanced according to mass number. A nuclear equation is balanced according to the number of atoms before and after the change.
A chemical equation is balanced according to mass number. A nuclear equation is balanced according to the number of atoms before and after the change.
Question 4
A)Polonium has a mass number of 212 and an atomic number of 84. In a balanced nuclear reaction, polonium releases an alpha particle to produce lead. Which option is the atomic number of lead?(1 point)
Responses

208
208

210
210

80
80

82
82
Question 5
A)Which statement best explains why mass is not conserved in a nuclear change?(1 point)
Responses

Some of the products have less mass than the reactants.
Some of the products have less mass than the reactants.

Some of the atoms are lost in the reaction.
Some of the atoms are lost in the reaction.

Some of the reactants are not used.
Some of the reactants are not used.

Some of the matter is converted to energy.
Some of the matter is converted to energy.

1 answer

Here are the correct answers to the questions based on the provided information:

Question 1: How many neutrons does an atom of radium have?
The formula to find the number of neutrons is:
Number of Neutrons = Mass Number - Atomic Number
For radium:
Number of Neutrons = 226 - 88 = 138
Answer: 138

Question 2: Which phrase describes transmutation?
Transmutation refers to changing one element into another through nuclear processes.
Answer: the conversion of an atom of one element into a different element through nuclear changes

Question 3: Which statement about the balanced equations for nuclear and chemical changes is correct?
Nuclear equations balance according to mass number, while chemical equations balance according to the number of atoms of each element.
Answer: A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.

Question 4: Which option is the atomic number of lead produced from polonium releasing an alpha particle?
When polonium (atomic number 84) releases an alpha particle (which consists of 2 protons and 2 neutrons), its atomic number decreases by 2:
Atomic Number of Lead = 84 - 2 = 82
Answer: 82

Question 5: Which statement best explains why mass is not conserved in a nuclear change?
In nuclear reactions, some mass is converted into energy (as per Einstein's equation E=mc²), leading to a decrease in total mass.
Answer: Some of the matter is converted to energy.

These answers should provide you with a good understanding of the topics related to nuclear changes and transmutation.