Chemistry Review

Salt water, plastic, and helium are all made of

• mixtures

• electrons

• atoms

• compounds

Tags

NGSS.MS-PS1-1

Neutral atoms have an equal number of

• protons and electrons

• electrons and neutrons

• protons and neutrons

• prions, neutrons, and electrons

The atomic number of an atom tells the number of ____

• atoms in a reaction

• protons in an atom

• electrons in an atom

• the atomic mass of a atom

Elements on the Periodic Table of the Elements are classified into categories such as

• mixtures and compounds

• metals and nonmetals

• rocks and minerals

• molecules and atoms

Which statement best describes the organization of the periodic table of the elements?

• all gases are grouped together

• elements within a period have the same number of electrons

• gases easily form compounds with other elements

• elements within a group have similar properties

Elements are organized on the periodic table according to

• atomic number

• atomic mass

• electronegativity values

• the number of neutrons

Tags

NGSS.HS-PS1-1

Elements found in group 18 are called noble gases and helium, neon, argon, etc are grouped together because

• they have excess electrons to share

• they are lighter than air

• they have full outer electron shells

• they easily react with other elements

When _____ are combined and interact they form _____.

• atoms, reactants

• reactants, atoms

• products, reactants

• reactants, products

Tags

NGSS.MS-PS1-2

In a solution, the substance that is being dissolved is the ______

• solute

• solvent

• liquid

• mixture

In a solution, the substance that does the dissolving is the ____

• solute

• solvent

• mixture

• liquid