Chemistry Review #2

Which of these describes a physical change?

• Wood logs are burned in a fire and form ashes.

• Coconut oil begins to solidify after being placed in a freezer.

• Sodium and chlorine combine to form a new product of salt.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of these describes a chemical change?

• Wood logs are burned in a fire and form ashes.

• Coconut oil begins to solidify after being placed in a freezer.

• water boils and evaporates

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Energy is absorbed by the reaction and the temperature of the surroundings decrease. Is this an endothermic or exothermic reaction?

• Endothermic reaction

• Exothermic reaction

• Neither endothermic or exothermic reaction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Baking soda and vinegar are combined. To your surprise, the total mass of the product is slightly less than the total mass of the reactants. Knowing the Law of Conservation, what happened to the "missing" mass?

• Some of the atoms were destroyed.

• Some of the mass was converted into thermal energy.

• Some of the atoms were rearranged to form a gas.

Tags

NGSS.MS-PS1-5

Look at the pictures of the compounds and identify the one that matches: C₃H₆O

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Tags

NGSS.MS-PS1-1

Reactivity, toxicity, flammability are all .... ​ ​ ​

• Physical Properties

• Chemical Properties

Tags

NGSS.MS-PS1-2

Look at the pictures of the compounds and identify the one that matches: C₅H₁₀O₂

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• 
• 

Tags

NGSS.MS-PS1-1

Look at the pictures of the compounds and identify the one that matches: C₂H₆O₂

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• 
• 

Tags

NGSS.MS-PS1-1

Boiling Point, solubility, density, and mass are all .... ​ ​ ​

• Physical Properties

• Chemical Properties

Tags

NGSS.MS-PS1-2

The flames from a camp fire produce an exothermic reaction which ______________.

• absorbs energy

• releases energy

• neither absorbs or releases energy