Physical and Chemical Changes: Law of Conservation of Matter

What does the Law of Conservation of Matter state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction.

Tags

NGSS.MS-PS1-5

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

• True

• False

Tags

NGSS.MS-PS1-5

Students want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed bag. Which of the following would provide the evidence the students need?

• 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 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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Matter is not created or [BLANK] during a chemical reaction

• Balanced

• Mass

• Destroyed

• Coefficient

Tags

NGSS.MS-PS1-5

A change that does not result in a new substance

• chemical property

• chemical change

• physical propert

• physical change

What tool might a scientist use to demonstrate the Law of Conservation of Matter?

• ruler

• beaker

• thermometer

• balance scale

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction,

• the atoms of the reactants always stay together.

• the atoms of the reactants rearrange, to form new products.

• new atoms are formed when combined to make the products

• some atoms disappear & others multiply to form products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What states that matter is not created or destroyed in a chemical reaction and that the mass does not change.

• Subscript

• Law of conservation of matter

• Coefficient

• Atoms

Tags

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• Melting of ice

• Burning of wood

• Rusting of iron

• Baking a cake

In a closed system, the mass of reactants before a chemical reaction is 50 grams. What will be the mass of the products after the reaction according to the Law of Conservation of Matter?

• 50 grams

• 45 grams

• 55 grams

• 60 grams

Tags

NGSS.MS-PS1-5