Modeling Chemical Reactions Quiz

What kind of reaction is this:
2H₂O₂ →2 H₂O + O₂

• Synthesis
• Decomposition
• Single Replacement 
• Combustion

Tags

NGSS.MS-PS1-2

Which of the following are PRODUCTS?
H₂O + CO₂ → HCO + HO

• H₂O and CO₂
• HCO and HO
• H₂O ONLY
• HCO ONLY

Tags

NGSS.MS-PS1-5

A chemical reaction occurs that involves combining 1 atom of zinc with 2 atoms hydrogen and 2 atoms of chlorine. After the reaction, how many atoms of each element will there be?

• 1 zinc, 2 hydrogen, 2 chlorine

• 2 zinc, 2 hydrogen, 2 chlorine

• 2 zinc, 1 hydrogen, 2 chlorine

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The formula for hydrogen peroxide is H₂O₂. Which model represents hydrogen peroxide?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Students are conducting an experiment to find out what they can do to make a reaction between hydrochloric acid (HCl) and magnesium (Mg) follow the Law of Conservation of Mass. The data from their experiment is in the chart shown. Which idea would improve the design of the experiment so that the results would more accurately demonstrate the Law of Conservation of Mass?

• Students should put a balloon over the top of the flask to close the system and avoid gases to escape.

• Students should add more magnesium to the reaction to increase the mass of the products.

• Students should decrease the amount of acid to decrease the mass of the products.

Tags

7-PS1-5

The chemical formula for nitric acid is HNO₃. What composes this compound?

• 1 helium atom, 1 nitrogen atom, and 3 osmium

• 1 hydrogen atom, 1 sodium atom, and 3 oxygen atoms

• 1 helium atom, 1 sodium atom, and 3 osmium atoms

• 1 hydrogen atom, 1 nitrogen atom, and 3 oxygen atoms

Tags

7-PS1-5

A teacher does a reaction with baking soda and vinegar. She measures the mass of the reactants before the experiment, mixes the baking soda and vinegar together in an open test tube, and then measures the mass of the products after the experiment. She notices the mass of the products is less than the mass of the reactants. What most likely explains the difference in the mass before and after the reaction?

• A gas was produced in the reaction that escaped because the reaction was in an open system.

• A precipitate was formed and it left because the reaction was in a closed system.

• The temperature of the reactants was lower than the products.

• Some matter was destroyed in the chemical reaction.

Tags

7-PS1-5

The chemical equation for a combustion reaction is shown. What is the number of hydrogen atoms on the reactant side?

• 1

• 2

• 6

• 12

Tags

7-PS1-5

Which of the following is a synthesis reaction?

• 2H₂O --> 2H₂ + O₂

• Fe + CuSO₄ --> FeSO₄ + Cu

• Cu + SO₄ --> CuSO₄

• Zn + 2HCl --> ZnCl₂ + H₂

Six molecules of Carbon dioxide and six molecules of water react to form one molecule of glucose (C₆H₁₂O₆) and 6 molecules of Oxygen. Which equation represents this reaction?

• C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O

• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

• 6CO₂ + 6H₂O₂ --> C₆H₁₂O₆ + 6O₃

• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6H₂O

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3