Radioactivity — Unit test

Question 1

Which lists only metalloids?

Revolt · Accepted Answer

boron (B), germanium (Ge), and tellurium (Te)

Question 2

Which properties are characteristic of metalloids?

Revolt · Accepted Answer

intermediate conductivity and a high melting point

Question 3

What was Antoine Henri Becquerel studying when he discovered radioactivity?

Revolt · Accepted Answer

phosphorescence

Question 4

The equation for photosynthesis is 6H2O (water) + 6CO2 (carbon dioxide) + Light Energy → C6H12O6 (glucose) + 6O2 (oxygen). When first discovered, scientists were trying to decide if the oxygen in the product came from carbon dioxide or water. Which statement describes how scientists traced the path of oxygen?

Revolt · Accepted Answer

They used a radioactive isotope and tracked it with a Geiger counter.

Question 5

Which best describes a radioactive isotope?

Revolt · Accepted Answer

An atom is unstable.

Question 6

Atom A and Atom B have the same number of protons, but they do not have the same number of neutrons.Which statement describes these atoms?

Revolt · Accepted Answer

Atom A and Atom B are isotopes of the same element.

Question 7

Which property do metalloids share with nonmetals?

Revolt · Accepted Answer

Both are brittle.

Question 8

Which lists the elements in order from most conductive to least conductive?

Revolt · Accepted Answer

potassium (K), germanium (Ge), selenium (Se)

Question 9

This chart show the amount of radioactivity measured from three unknown isotopes.Which statement describes each of the isotopes?

Revolt · Accepted Answer

Isotope A was measured at day 24, Isotope B was measured at day 6, and Isotope C was measured at day 10.

Question 10

Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?

Revolt · Accepted Answer

Antoine Lavoisier

Radioactivity — Unit test Answers

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