Chemical Reactions Unit Test

In a chemical equation, substances on the right of the arrow are

• reactants

• products

• precipitates

• catalysts

Tags

NGSS.MS-PS1-5

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

What term is used to describe the "4" in the expression 4 Ca(NO₃)₂?

• catalyst

• superscript

• subscript

• coefficient

In the expression 4Ca(NO₃)₂, the total number of nitrogen atoms is

• 1

• 2

• 5

• 8

Tags

NGSS.MS-PS1-1

Oxygen gas is always written as O₂ in chemical equations. What term is used to describe the "2" in this formula?

• subscript

• exponent

• product

• reactant

How do you show that a substance is dissolved in water when writing a chemical equation?

• (s)

• (l)

• (g)

• (aq)

According to the law of conservation of mass, how does the mass of the products compare to the mass of reactants?

• there is no relationship

• the mass of products is greater

• the masses are equal

• the mass of reactants is greater

Tags

NGSS.MS-PS1-5

A substance that speeds up a chemical reaction without being permanently changed itself is called a(n)

• catalyst

• inhibitor

• reactant

• product

Tags

NGSS.HS-PS1-5

The reaction where hydrogen and oxygen gas form water can be classified as a(n) ____ reaction.

• decomposition

• precipitate

• synthesis

• single-displacement

Which of the following materials will burn the fastest in open air?

• a log, 2 feet in diameter

• 2 logs, each 1 foot in diameter

• a pile of small splinters cut from a 2 foot diameter log

• both logs and the splinters will burn at the same time

Tags

NGSS.MS-PS1-4