Chemical Reactions and Mass Conservation

identify the following chemical reaction

HBr + 1 Al(OH)3------->3 H2O + 1 AlBr3

• decomposition

• synthesis (or combination)

• single displacement

• double displacement

Answer explanation

double displacement is a a type of chemical reaction where two compounds sawp parts to form two new compounds !

what reaction has the following general formula

A + CD---> C+ AD

• double replacement

• decomposition

• synthesis

• single rplacement

• combustion

Answer explanation

single replacement is the type of chemical reaction where one element replaces another in a compound !

at the end of chemical reactions, what is the total mass of the reations compared to the total mass of the products?

• the mass is the same

• the product is half the mass of the reactants

• the product is doubled

• the mass changes depending on the reaction

Answer explanation

the mass is the same because matter cannot be created or destroyed in a chemical reaction !

Tags

NGSS.MS-PS1-5

in a chemical reaction everything to the right of the arrow is called __________

• recatants

• products

• yields

• molecules

Answer explanation

everything to the RIGHT is always called the PRODUCTS and everything to the LEFT is always called the REACTANTS !

which type of chemical reaction has two or more reactants to make one product?

• synthesis

• combustion

• single displacement

• double displacement

• decomposition

what reaction has the following general formula

A + B---> AB

• double replacement

• decomposition

• combustion

• single replacement

• synthesis

what reaction has the following general formula

AB + CD--> CB + AD

• double replacement

• decomposition

• combustion

• synthesis

• single replacement

identify the following chemical reation

Pb + FeSO4---> PbSO4 + Fe

• doule displacement

• decomposition

• synthesis (or combination)

• single displacement

which phrase describes what happens to atoms in a chemical reaction?

• sometimes lost, gained, or rearranged

• lost or gained, never rearranged

• never lost or gained, just rearranged

• sometimes lost, never rearranged

Answer explanation

atoms are never lost or gained in a chemical reaction because matter can only be transformed !

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

what reaction has the follwing general formula

AB--> A + B

• combustion

• single replacement

• decomposition

• synthesis

• double replacement

Answer explanation

decomosition is the breaking down of two or more reactions !