Grade 7 Science Exam (OSE Units 1-3)

What evidence indicates a chemical reaction has occurred?

• Change in state

• Formation of a gas

• Dissolving of a substance

• Melting of ice

Tags

NGSS.MS-PS1-2

Which of the following is a product in the reaction: H₂ + O₂ → H₂O?

• H₂

• O₂

• H₂O

• All of the above

Tags

NGSS.MS-PS1-2

What does the Law of Conservation of Mass state?

• Mass can be created

• Mass can be destroyed

• Mass is conserved in a closed system

• Mass changes during a reaction

Tags

NGSS.MS-PS1-5

In a chemical reaction, atoms are:

• Destroy

• Rearranged

• Created

• Unchanged

Tags

NGSS.MS-PS1-5

Which scenario best demonstrates a chemical change?

• A) Ice melting

• B) Sugar dissolving

• C) Iron rusting

• D) Water boiling

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The role of reactants in a chemical reaction is to:

• Speed up the reaction

• Form new products

• Remain unchanged

• Decrease the temperature

Tags

NGSS.MS-PS1-5

Which of the following is a physical change?

• Burning wood

• Baking a cake

• Melting butter

• Tarnishing silver

What is formed when vinegar and baking soda are mixed?

• Oxygen gas

• Carbon dioxide gas

• Hydrogen gas

• Nitrogen gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction releases energy in the form of heat?

• Endothermic

• Exothermic

• Neutral

• Photochemical

Tags

NGSS.HS-PS1-4

In an endothermic reaction, the temperature of the surroundings:

• Increases

• Decreases

• Remains the same

• Fluctuates

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4