McGraw Hill - Chemistry - Chapter 2 Test

Front

What happens to the mass of popcorn when it is popped?

Back

The mass of the popped popcorn is less than the unpopped popcorn due to the loss of steam, but mass is not destroyed.

Front

What are the four classical elements according to Greek philosophers?

Back

Earth, air, fire, and water.

Front

What is the atomic number of an isotope of carbon with 6 protons?

Back

6.

Front

What is NOT evidence for energy levels in atoms?

Back

Atoms can lose or gain electrons.

Front

Which metal has the electron dot structure that corresponds to aluminum?

Back

Aluminum.

Front

What is the principle of conservation of mass in chemistry?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

Define an isotope.

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic number?

Back

The atomic number determines the identity of an element and is equal to the number of protons in the nucleus.

Front

How do you determine the number of neutrons in an isotope?

Back

Subtract the atomic number from the mass number.

Front

What is an electron dot structure?

Back

An electron dot structure represents the valence electrons of an atom as dots around the element's symbol.