CHEMISTRY EXAM

Which one is not a property

• Mass

• Density

• Melting Point

• Solubility

What is the difference between a physical and chemical change?

• Physical just changes what it looks like chemical changes how the atoms bond

• Physical and chemical changes are the same

• Physical is the action of what you do and chemical is what you see the stuff doing

• Physical and chemical changes are not related to each other

Balance this equation

• 6P + O₂ -------> 3P₂O₅

• P₄ + O₂ ------> 2P₂O₅

• 2P + 2O₂ ------> P₂O₅

• 4P + 5O₂ ------> 2P₂O₅

what is an atom

• smallest part of the universe

• smallest part of a substance

• smallest part of anything

• smallest part of water

Tags

NGSS.MS-PS1-1

protons

• negative charge, nucleus

• positive charge, shells

• positive charge , nucleus

• neutral charge, nucleus

electrons

• no charge, nucleus

• positive charge, nucleus

• negative charge, shells

• negative charge, nucleus

atomic number

• number of protons/stands for an element

• number of neutrons

• number of electrons

• number of protons and neutrons

mass number

• number of protons

• number of electrons

• number of protons and electrons

• number of protons and neutrons

Tags

NGSS.HS-PS1-8

same number of protons, different number of neutrons

• atomic number

• mass number

• isotope

• ion

How many neutron are in the atom "K"?

• 7

• 2

• 39

• 12