Chemical Equations Practice

All the following are clues that a chemical reaction has taken place except:

• color change

• a solid forms

• a solid melts

• bubbles form

• heat is given off

Tags

NGSS.MS-PS1-2

Each substance to the right of the arrow in a chemical equation is a(n) ___.

• catalyst

• reactant

• inhibitor

• product

Which of the following is a balanced chemical equation?

• AgNO₃ + NaCl → AgCl + 2NaNO₃

• 2AgNO₃ + 2NaCl → 3AgCl + 2NaNO₃

• AgNO₃ + NaCl → AgCl + NaNO₃

• AgNO₃ + 2NaCl → AgCl + 3NaNO₃

Tags

NGSS.HS-PS1-7

Which of the following could represent a decomposition reaction?

• compound → element + element

• compound + compound → compound + compound

• element + compound → element + compound

• element + element → compound

A(n) ____ chemical equation has the same number of atoms of each element on each side of the equation.

• balanced

• complex

• simple

• unbalanced

Tags

NGSS.HS-PS1-7

Numbers that are before symbols and formulas in a chemical equation are ____.

• catalysts

• coefficients

• superscripts

• subscripts

In a chemical equation, the symbol that means dissolved in water is ____.

• (aq)

• (s)

• (dw)

• (l)

A chemical reaction in which two or more substances combine to form another substance is called a ____.

• synthesis reaction

• decomposition reaction

• product

• reactant

Tags

NGSS.MS-PS1-5

Pb(N03)2 + 2KI --> PbI2 + 2KNO3

Which of these is a product?

• Pb(NO₃)₂

• PbI₂

• Pb

• KI

When one element replaces another element in a compound, the reaction is a ____ reaction.

• decomposition

• double-displacement

• single-displacement

• synthesis