Law of Conservation of Mass

Front

Matter can not be created nor destroyed: it can only be

Back

Transformed, changed

Tags

NGSS.MS-PS1-5

Front

What is the Law of Conservation of mass?

Back

Mass is never created or destroyed

Tags

NGSS.MS-PS1-5

Front

Law of Conservation of Mass

Back

The mass of the reactants equals the mass of the products

Tags

NGSS.MS-PS1-5

Front

Which of the following describes a chemical reaction?

• Oxygen interacts with iron to form rust
• Ice melts into water
• Carbon dioxide freezes to make dry ice
• Rocks split apart over many years due to weathering

Back

Oxygen interacts with iron to form rust

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What do we call the chemicals that result from a chemical reaction?

Back

products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Substances present at the start of a chemical reaction

Back

reactants

Front

Is melting butter for popcorn a chemical or physical change?

Back

physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

Which of the following is a sign that a chemical reaction has occurred? Options: change in shape, melting, formation of a gas, dissolving

Back

formation of a gas

Tags

NGSS.MS-PS1-2

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete? Options: They both will weigh the same, The product always weighs more than the reactant, The reactant will weigh more than the product, They both will lose mass after the reaction.

Back

They both will weigh the same

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction? Options: The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction., Bubbles were produced during the reaction, which meant that a gas was being produced., The plastic bag did not change in any way, indicating that it was not involved in the reaction., The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Back

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5