Chemical Reaction Test Review I

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.MS-PS1-5

The energy required to break the original bonds is less than the energy release when new bonds form in a(n) _______ reaction.

• endothermic

• exothermic

• combustion

• exergonic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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

• catalyst

• reactant

• product

• inhibitor

Tags

NGSS.MS-PS1-5

The burning of wood in a campfire that produces heat and light would be an ____ reaction.

• exothermic

• exoplasmic

• endothermic

• endorgonic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

All chemical reactions release or absorb energy. What is the source of this energy?

• precipitates

• compounds

• products

• chemical bonds

Tags

NGSS.HS-PS1-4

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

• (s)

• (aq)

• (dw)

• (I)

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

• catalysts

• subscripts

• coefficients

• superscripts

Tags

NGSS.MS-PS1-5

Each substance on the left side of the arrow in a chemical equation is a ____.

• product

• catalyst

• reactant

• coefficient

Tags

NGSS.MS-PS1-5

If heat must be added to a chemical reaction for the reaction to take place, the reaction is ____.

• endothermic

• balanced

• reactant

• exothermic

Tags

NGSS.HS-PS1-4

According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?

• 2

• 4

• 0

• 1

Tags

NGSS.MS-PS1-5