Ask a New Question
Menu

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 314 314 226 226 138 138 88 88 Question 2 A)Which phrase describes transmutation?(1 point) Responses 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 the conversion of one substance to another through chemical changes the conversion of one substance to another through chemical changes 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 Question 3 A)Which statement about the balanced equations for nuclear and chemical changes is correct? (1 point) Responses A chemical equation is balanced according to mass number. A nuclear equation is balanced according to the total mass before and after the change. A chemical equation is balanced according to mass number. A nuclear equation is balanced according to the total mass 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. Both are balanced according to the mass number of each element before and after the change. Both are balanced according to the mass number of each element before and after the change. A nuclear equation is balanced according to mass number. A chemical equation is 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 total mass 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 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 products have less mass than the reactants. Some of the products have less mass than the reactants. Some of the matter is converted to energy. Some of the matter is converted to energy.

1 answer

Here are the correct answers to each question based on the provided information:

Question 1 A) How many neutrons does an atom of radium have?

  • The number of neutrons can be calculated using the formula: Neutrons = Mass number - Atomic number Neutrons = 226 - 88 = 138

Question 2 A) Which phrase describes transmutation?

  • The correct phrase is: 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?

  • The correct statement is: Both are balanced according to the total mass before and after the change.

Question 4 A) In a balanced nuclear reaction, polonium releases an alpha particle to produce lead. Which option is the atomic number of lead?

  • Polonium has an atomic number of 84. When it releases an alpha particle (which consists of 2 protons and 2 neutrons), its atomic number decreases by 2: 84 - 2 = 82.

Question 5 A) Which statement best explains why mass is not conserved in a nuclear change?

  • The best explanation is: Some of the matter is converted to energy.

If you need further clarification on any of these answers, feel free to ask!