Nature of Matter

1. Select the model that BEST represents the Law of Conservation of Matter.

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NGSS.MS-PS1-5

Based on Law of Conservation of Matter, how many total atoms much in the product of the balanced chemical equation?

• 2

• 4

• 6

• 12

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which substance can be identified as a homogeneous mixture?

• peanut butter sandwich

• chocolate chip cookie

• pepperoni pizza

• chocolate milk

Which term BEST describes a substance composed of a single element or a single compound that cannot be broken down by physical means?

• homogeneous mixture

• heterogeneous mixture

• pure substance

• element

What is an example of a chemical property?

• ductility

• color

• thermal conductivy

• reactivity with water

Jaylen mixes 30 grams of baking soda with 100 grams of vinegar in a closed container. Based on the Law of Conservation of Matter, what represents the total mass of all reactants after the experiment?

• 30 grams

• 70 grams

• 130 grams

• 170 grams

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NGSS.MS-PS1-5

Marianna reviews the reactants in a chemical equation. How many total oxygen (O) atoms must be in the products according to the Law of Conservation of Matter?

NO₂ + H₂O

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-5

Atoms are

• Only made of protons

• The smallest unit of matter

• Only made of electrons

• Made of 5 subatomic particles

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NGSS.MS-PS1-1

An element

• is a type of vehicle made by Toyota.

• consists of 2 types of atoms bonded together.

• consists of more than one type of atom.

• is a pure substance that consists entirely of one type of atom.

H₂O

• is a compound but not a molecule

• is only a molecule and not a compound

• is a compound and is also referred to as a molecule

• is neither a compound or molecule

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NGSS.MS-PS1-1