Chemistry of Life

Biomolecules are...

• molecules that are alive

• those molecules that are unique to living cells

• molecules from plants and animals

• molecules made of chloroplast

What does the atomic number represent?

• number of electron shells

• number of protons

• number of electrons

• number of elements

An element is a..

• has distinctive physical properties

• cannot be broken down into other substances

• has distinctive chemical properties

• pure substance

Select the INCORRECT PAIRING option

• Proton has a positive charge

• Neutron has a small negative charge

• Electrons have a negative charge

Negatively charged electrons. move around the nucleus in ....

• Electron Shells

• Electron Chains

• Electron Portals

• Chemical Bonds

Isotopes of an element have the same number of protons and electrons but differ in the....

• number of electrons

• number of electron shells

• number of available protons

• number of neutrons

How do atom s with unfilled outermost shells achieve stability?

• sharing electrons

• sharing protons

• sharing neutrons

• going to therapy

What are molecules?

• individual atoms

• Two or more atoms that share electrons

• Have a covalent bond

• clumps of protons

When does an atom become a positively charged ion?

• when it loses one or more neutron

• when it loses one or more proton

• when it loses one or more electron

An atom becomes a negatively charged ion when it

• gains one or more electrons

• gains one or more neutrons

• gains one or more protons

• gains one or more molecules