Radioactive Decay and Isotopes Quiz

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Questions and Answers

Explain the difference between an isotope and a radioisotope.

An isotope is a variation of an element that has the same number of protons but a different number of neutrons. A radioisotope is an isotope that is radioactive, meaning it decays and emits radiation.

Calculation the value of a 100g sample of a radioactive substance has a half-life of 5 years. How much of the substance remains radioactive after 15 years? Answer: 12.5g

12.5g

What is Alpha Decay? A type of radioactive decay where an alpha particle is emitted, reducing the atomic number by 2 and mass number by 4.

Alpha decay is a type of radioactive decay where an alpha particle, which is composed of two protons and two neutrons, is emitted from the nucleus of a radioactive atom.

After 2 trials in the M&M lab, 25 M&M's remain. If each trial represents one half-life, how many M&M's would be present after 5 half-lives?

1.5625 M&M’s Signup and view all the answers

Based on the graph estimate the half-life of Mercury 203.

4.2 years Signup and view all the answers

If each trial represents 4.2 years, what is the half-life of the red M&M’s?

4.2 years Signup and view all the answers

Suppose you start with 100 grams of red M&M’s. How much remains after 12.6 years? Answer: 5 grams.

5 grams Signup and view all the answers

Describe the relationship between the parent material and the daughter material over time. Answer: As the parent material decreases due to radioactive decay, the daughter material increases proportionally.

As the parent material decreases due to radioactive decay, the daughter material increases proportionally. Signup and view all the answers

The half-life of radium-222 is 38 seconds. If you have a 12-gram sample, how much remains after 114 seconds? Answer: 1.5 grams.

1.5 grams Signup and view all the answers

Matter cannot be created or destroyed in a chemical reaction. Therefore, the number of each type of atom must be the same on both sides of a chemical equation.

True (A) Signup and view all the answers

What are reactants and products? Substances on the left side of the equation are reactants, and those on the right side are products.

Reactants are the starting materials in a chemical reaction, while products are the substances formed as a result of the reaction. Signup and view all the answers

What are coefficients? Numbers placed before compounds to balance the equation.

Coefficients are numbers placed in front of chemical formulas in a balanced chemical equation to ensure that the number of atoms of each element is the same on both sides of the equation. Signup and view all the answers

What are diatomic molecules? Elements that exist as two atoms bonded together in their natural form (e.g., H2, O2, N2).

Diatomic molecules are molecules composed of two atoms of the same element bonded together. These molecules are stable in their natural state, commonly found as gases. Signup and view all the answers

What are binary compounds? Compounds composed of two different elements (e.g., NaCl, H2O).

Binary compounds are chemical compounds formed by the combination of two different elements. Signup and view all the answers

Flashcards

Half-life

The time it takes for half of a radioactive sample to decay.

Parent Material

The original radioactive material before decay.

Daughter Material

The stable material formed after radioactive decay.

Alpha Decay

A type of radioactive decay where an alpha particle (consisting of two protons and two neutrons) is emitted, reducing the atomic number by 2 and the mass number by 4.