Conservation of Matter

Matter and energy are conserved in physical and chemical changes. They might "hide" as another form of matter or energy, or move to another place, but the total amount of matter and energy in a closed system does not change.

• True

• False

In a physical or chemical change, what are two things that do not change?

• Volume and temperature
• Color and shape
• Density and pressure
• Mass and number of atoms
• Matter and energy

​ (a)   is conserved during a chemical exchange. The number and type of ​ (b)   present before a chemical change equals the number and type of atoms present after the change.

• Matter
• atoms

Matter is also conserved during a ​ (a)   change. Sometimes young students misunderstand the conservation of matter.

When water boils, each of the liquid water molecules now acts like a gas particle, but none are lost. Matter is ​ (b)   .

When a rock erodes, particles of the rock are rubbed off, but do not disappear.

• physical
• conserved

Energy is conserved in every physical and ​ (a)   change. It might appear as if heat energy is created when a chemical reaction releases heat, however, the chemical potential energy was stored in the chemical bonds before the reaction happened. Energy is conserved.

Within a system, matter and ​ (b)   are always conserved.

• energy
• chemical

In ​ (a)   reactions (fission and fusion), matter transforms into ​ (b)   ; however, the total amount of ​ (c)   plus energy before the reaction equals the total amount after the reaction. Matter and energy are always conserved.

• nuclear
• energy
• matter

States that matter is neither created nor destroyed.

• Chemical Reaction

• The Law of Conservation of Mass

• Chemical Symbol

• The Law of Gravity

Tags

NGSS.MS-PS1-5

Which of the following is a reactant in this chemical equation?

• O₂

• H₂O

• +

• Yields

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a product in this chemical equation?

• O₂

• H₂O

• H₂

• Yields

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Hydrogen (H) atoms are on the reactants side of this equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5