Conservation of Mass/ Chem Reactions

Anything that has mass & takes up space

• gravity
• force
• matter
• volume

Tags

NGSS.MS-PS1-1

Smallest unit of an element

• compound
• atom
• molecule
• product

Tags

NGSS.MS-PS1-1

Substance that cannot be broken into simpler substances

• element
• molecule
• gram
• proton

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-PS1-2

NGSS.MS-PS1-5

Substances present at the start of a chemical reaction

• subscripts
• coefficients
• reactants
• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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