Conservation of Mass

Substance made up of chemically combined elements

• atom
• element
• electron
• compound

Tags

NGSS.MS-PS1-1

Number placed in front of a chemical formula

• product
• coefficient
• reactant
• subscript

Number written below & to the right of a chemical symbol

• subscript
• reactant
• product
• coefficient

Substances that form as the result of a chemical reaction

• products
• reactants
• coefficients
• subscripts

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Substances present at the start of a chemical reaction

• subscripts
• coefficients
• reactants
• products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

• The mass of the balloon increases because the size of the balloon has increased.
• The mass of the balloon increases because the temperature of the balloon has increased.
• The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

Tags

NGSS.MS-PS1-5

A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?

• 500 grams, because the cheese does not gain or lose mass just because it was melted
• 499 grams, because some of the cheese evaporates as it melts
• 502 grams, because the cheese absorbs heat as it melts

Tags

NGSS.MS-PS1-5

The principle of conservation of mass is true for

• Physical Changes
• Chemical Changes
• Neither
• Both

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What does the principle of conservation of mass mean?

• The total mass of the reactants is more than the products
• Matter is not created or destroyed
• The total mass of the reactants is less than the products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The total amount of matter (atoms) before and after a chemical reaction (change), remains the same.

• True
• False

Tags

NGSS.MS-PS1-5