Characteristics of Chemical Reactions - Quiz 2.1

Formed when two or more atoms chemically combine.

• Atom

• Reactant

• Product

• Molecule

Tags

NGSS.MS-PS1-1

A process that leads to the transformation of one set of chemical substances to another.

• Atom

• Chemical Reaction

• Product

• Dissolving

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?

• Hydrogen molecules are negative and oxygen positive.

• For every oxygen atom, two hydrogen atoms are needed.

• The hydrogen and oxygen atoms regroup into a new molecule

• Oxygen atoms are much larger than hydrogen atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Smallest part of a substance.

• Atom

• Chemical Reaction

• Product

• Dissolving

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

The substance initially involved in a chemical reaction.

• Molecule

• Reactant

• Product

• Precipitate

Tags

NGSS.MS-PS1-2

An experiment is performed in which a crystalline substance is added to a beaker filled with room-temperature water. Which observations are evidence that a chemical reaction took place? (Check all of the answers that are correct)

• Crystals dissolve.

• A precipitate forms.

• Bubbles are produced.

• The beaker felt warm to the touch after the two substances were mixed.

Tags

NGSS.MS-PS1-2

A _____________________ is a solid substance that forms and separates from a solution and may indicate that a chemical reaction has occurred

• Molecule

• Reactant

• Product

• Precipitate

Tags

NGSS.MS-PS1-2

A white powder was placed into a beaker of clear liquid. Below are the different observations that were made. Classify the observed properties as physical or chemical. Observation#1: The powder is white before the reaction.

• Physical

• Chemical

A white powder was placed into a beaker of clear liquid. Below are the different observations that were made. Classify the observed properties as physical or chemical. Observation #2: When the clear liquid and white powder are mixed together, there was an odor after the liquid turned yellow.

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A white powder was placed into a beaker of clear liquid. Below are the different observations that were made. Classify the observed properties as physical or chemical. Observation #3: The powder dissolved in the liquid. *

• Physical

• Chemical

Tags

NGSS.MS-PS1-2