Chemistry Concepts

Front

The attraction between the hydrogen atom in one water molecule and the oxygen molecule in another is an example of a(n) __________ bond.

Back

Hydrogen bond

Front

What determines the atomic number of an atom?

Back

Number of protons in the atomic nucleus

Front

Which four elements make up approximately 96% of living matter?

Back

Carbon, hydrogen, nitrogen, oxygen

Front

An atom with an atomic number of 110 contains how many protons?

Back

110 protons

Front

Carbon-14 is used for carbon dating to determine the age of items.

Back

Carbon-14 contains six protons and eight neutrons.

Front

During carbon-14 decay, one neutron becomes a proton and an electron is emitted.

Back

The resulting atom is now a different element because the number of protons has changed.

Front

Fluorine isotope is used in PET scans.

Back

The non-isotope form of fluorine has 9 electrons, 9 protons, and 10 neutrons.

Front

Fluorine isotope in PET scans has 9 neutrons.

Back

The isotope form has only 8 electrons.

Front

Water helps in homeostasis by not changing temperature easily.

Back

Water is polar and forms hydrogen bonds that help molecules stick together.

Front

Water makes up approximately 70% of all living things.

Back

Water is an important participant/product in many chemical reactions.