A change in which property for a substance is an indication of a chemical reaction?

• State of Matter

• Mass

• Odor

• Volume

Tags

NGSS.MS-PS1-2

2. Why are the properties of the products of a chemical reaction different from the properties of the reactants?

• 1. The products combine the properties of the reactants.

• 1. The products have the strongest properties of the reactants.

• 1. The reactants lose their properties during the reaction.

• 1. The products are different substances with unique properties.

Tags

NGSS.MS-PS1-2

Combustion reactions, especially those with hydrocarbons, yield which two products.

• Carbon Dioxide

• Oxygen

• Water Vapor

• Metal Oxide

1. The products are different substances with unique properties. Select two correct answers.

• 1. Color change

• 1. Change of state of matter

• 1. Gas produced

• 1. Precipitate formation

• 1. Increased volume in the test tube

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What will happen to the pH of lemon juice and the pH of baking soda if they are mixed together?

• 1. The pH of both will go up.

• 1. The pH of both will go down.

• 1. The pH of lemon juice will go up; the pH of baking soda will go down.

• 1. The pH of lemon juice will go down; the pH of baking soda will go up.

Tags

NGSS.MS-PS1-2

Identify the equation that is balanced, and therefore conserves atoms.

• N₂ + H₂ → 2NH₃

• 1. 2N₂ + 2H₂ → 4NH₃

• 1. 2N₂ + 3H₂ → 2NH₃

• 1. N₂ + 3H₂ → 2NH₃

Tags

NGSS.HS-PS1-7

3. Use the balanced chemical equation shown to determine how many sodium chloride (NaCl) compounds would result from combining 6 sodium (Na) atoms with 3 chloride (Cl₂) molecules.

2Na   +   Cl₂   →   2NaCl

• 1. 3 NaCl

• 1. 2 NaCl

• 1. 6 NaCl

• 1. This cannot be determined with the information provided.

Tags

NGSS.MS-PS1-5

Identify the equation that is balanced

• 1. 2KI + Pb(NO₃)₂ → 2KNO₃ + PbI₂

• 1. 2KI + Pb(NO₃)₂ → KNO₃ + 2PbI₂

• 1. KI + Pb(NO₃)₂ → KNO₃ + PbI₂

• 1. 2KI + 2Pb(NO₃)₂ → KNO₃ +2 PbI₂

Use the image of the reaction between magnesium and oxygen above to choose the balanced equation that accurately reflects the model.

• 1. Mg +2O → MgO₂

• 1. Mg₂ + O₂ → 2MgO

• 1. 2Mg + O₂ → 2MgO

• 1. Mg₂ + O → Mg₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

8. A chemical reaction is modeled by the particle diagram provided. Students developed a few representative chemical equations for the information provided in the model and were asked to determine if the reaction obeys the law of conservation of mass. Which chemical equation is an accurate representation of the model, and which claim is supported by the model?

   Select two correct answers.

• 1. 6X + 3Y → 6XY

• 1. 6X₂ + 3Y₂ → 6X₂Y

• 1. 12X + 6Y → 6X₂Y

• 1. Claim: The reaction obeys the law of conservation of mass.

• 1. Claim: The reaction does not obey the law of conservation of mass.

Tags

NGSS.HS-PS1-7