Rust is formed when iron reacts with oxygen. Which of the following is true?

This is a CHEMICAL change because the properties of rust are DIFFERENT than the properties of oxygen and iron.

This is a PHYSICAL change because the properties of rust are the SAME as the properties of oxygen and iron.

This is a CHEMICAL change because the properties of rust are the SAME as the properties of oxygen and iron.

This is a PHYSICAL change because the properties of rust are DIFFERENT than the properties of oxygen and iron.

What is the most important question to ask to determine whether a change is physical or chemical?

Did the state of matter change?

Chemical Reactions and Energy

Authored by Charles Martinez

Other Sciences

6th - 8th Grade

Used 1+ times

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

in a chemical equation, the reactants are on which side of the arrow?

top

right

left

bottom

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In a chemical equation, the products are on which side of the arrow?

top

right

left

bottom

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In a chemical equation, what is a subscript and what does it tell you?

the larger number in the front of the chemical formula that tells you the number of molecules in the reaction

the smaller number after the chemical symbol that tells you the number of molecules in the reaction

the larger number in the front of the chemical formula that tells you the number of atoms per molecule in the reaction

the smaller number after the chemical symbol that tells you the number of atoms per molecule in the reaction

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In a chemical equation, what is a cofeeicient and what does it tell you?

the larger number in the front of the chemical formula that tells you the number of molecules in the reaction

the smaller number below the chemical symbol that tells you the number of molecules in the reaction

the larger number in the front of the chemical formula that tells you the number of atoms per molecule in the reaction

the smaller number below the chemical symbol that tells you the number of atoms per molecule in the reaction

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In an exothermic reaction, energy is ________.

Absorbed

Released

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In an endothermic reaction, energy is ________.

absorbed

released

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Reactants + Energy → _________

Atoms

Molecules

Products

Energy

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Chemical Reactions and Energy

in a chemical equation, the reactants are on which side of the arrow?

In a chemical equation, the products are on which side of the arrow?

In a chemical equation, what is a subscript and what does it tell you?

In a chemical equation, what is a cofeeicient and what does it tell you?

In an exothermic reaction, energy is ________.

In an endothermic reaction, energy is ________.

Reactants + Energy → _________

Which reaction is endothermic?

Is photosynthesis an exothermic or endothermic reaction?

Baking bread and cooking an egg are examples of....?

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