Law of Conservation of Mass PreTest

Front

When wood is burned, it is changed into ash and carbon is released into the atmosphere as smoke. If 2 kg of wood were burned, how much ash would result?

Back

exactly 2 kg because mass is conserved in this system

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which best describes the total amount of mass present in a chemical reaction?

Back

It remains the same during the reaction.

Tags

NGSS.MS-PS1-5

Front

Amount of water needed to completely react with 25.00 grams of carbon dioxide in photosynthesis.

Back

10.23 g

Tags

NGSS.MS-LS1-6

Front

Balanced chemical reaction for the breakdown of KClO₃ into simpler substances?

Back

2KClO₃ → 2KCl + 3O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which reaction shows a conservation of atoms? H₂ + O₂ → H₂O, Na + Cl₂ → NaCl, N₂ + 3H₂ → 2NH₃, 2Al + O₂ → Al₂O₃

Back

N₂ + 3H₂ → 2NH₃

Tags

NGSS.MS-PS1-5

Front

Based on the Law of Conservation of Mass, which products would result from the break down of 2NaN₃? Options: Na + 2N₂, Na + 3N₂, 2Na + 3N₂, 3Na + 2N₂

Back

2Na + 3N₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Tyrone dissolves a cold medicine tablet in a glass of water. Before mixing, the mass of the water is 50 g and the mass of the tablet is 25 g. After mixing, a gas is given off. What is most likely correct about the mass of the final products?

Back

The final mass of the water and tablet combined would be less than 75 g.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which best explains the Law of Conservation of Mass?

Back

Matter is neither created nor destroyed during chemical changes.

Tags

NGSS.MS-PS1-5

Front

Regina heats ice cubes until the water turns into steam in a closed container. If the mass of the ice cubes is 50 grams before heating, what is the mass of the water after it turns to steam?

Back

The mass will be the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Front

A scientist combines three atoms of chlorine and six atoms of sodium resulting in a chemical reaction. How many atoms of chlorine must be in the product?

Back

3

Tags

NGSS.MS-PS1-1