Chemical Reactions

Atoms that gain or lose electrons are called...

• isotopes

• ions

• metals

The ionic compound made of calcium and chlorine is named...

• calcium chlorine

• calcium chloride

• calcium dichloride

This changes the way that atoms are arranged by breaking bonds and forming new substances

• Temperature

• Physical reaction

• Chemical Reaction

• Catalyst

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A reaction that combines simpler reactants to form a new compound is called a

• combustion

• decomposition

• concentration

• synthesis

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which statement reflects the law of conservation of mass

• Mass CAN be created but not destroyed

• Mass CAN be destroyed but not created

• Mass CAN NOT be created or destroyed

• Mass CAN be created and destroyed

Tags

NGSS.MS-PS1-5

The energy needed to break reactants apart or combine them into new products is known as

• bond energy

• exothermic energy

• heat energy

• endothermic energy

Tags

NGSS.HS-PS1-4

The color change that occurs when iron rusts is evidence of a(n)

• Physical change

• Increase in concentration

• Temperature change

• Chemical reaction

Tags

NGSS.MS-PS1-2

An exothermic reaction is typically shown by a(n)

• decrease in concentration

• increase in temperature

• increase in elements

• decrease in catalysts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The substances at the beginning of a chemical reaction are called

• catalysts

• precipitates

• products

• reactants

Tags

NGSS.MS-PS1-1

In a chemical reaction, the mass of the products is always

• less than the mass of the reactants

• equal to the mass of the reactants

• more than the mass of the reactants

• twice as much as the reactants

Tags

NGSS.MS-PS1-5