Chemistry – Precision and Design Semester Test

David is conducting an experiment in his chemistry class. He needs to understand what stoichiometry includes to accurately measure and mix chemicals. What does stoichiometry include?

• Chemical reactions

• Classify reactions

• Quantitative relationships of chemical reactions

• All the above.

In a science class experiment, Jackson observed ______ changes caused by collisions between atoms or molecules.

• Physical

• Chemical

• Biological

• Nuclear

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Benjamin and Scarlett are conducting a science experiment. What was Dalton’s proposed atomic theory?

• Atoms are created in chemical reactions

• Atoms are destroyed in chemical reactions

• Atoms are not created or destroyed in chemical reactions, only rearranged

• Atoms are converted to energy

Tags

NGSS.HS-PS1-7

What is the law of conservation of mass?

• The sum of the masses of the products is always equal to the sum of the reactants

• The mass of the reactants is greater than the mass of the products

• The mass of the products is greater than the mass of the reactants

• Mass is lost in a chemical reaction

Tags

NGSS.HS-PS1-7

Aiden is conducting an experiment in his chemistry class. He needs to identify the four types of common chemical reactions. What are they?

• Combination

• Decomposition

• Single Displacement

• Double Displacement

• All the above.

Jackson is conducting an experiment in his chemistry class. He needs to know how many atoms are in a mole of a substance to complete his calculations. What is the significance of Avogadro’s number in stoichiometry?

• It measures temperature

• It determines volume

• It represents the number of atoms in a mole

• It calculates pressure

Ava and Isla are baking cookies. They have 2 cups of flour and 1 cup of sugar. The recipe requires 1 cup of flour and 1 cup of sugar for each batch. What is the limiting reactant in their baking process?

• The ingredient that determines the temperature of the oven

• The ingredient that is completely consumed first after making the batches

• To calculate the pressure of the kitchen

• To measure the volume of the ingredients

Which of the following best describes a single displacement reaction?

• A reaction where two elements combine to form a compound

• A reaction where a compound breaks down into simpler substances

• A reaction where an element replaces another element in a compound

• A reaction where two compounds exchange ions

What is a double displacement reaction?

• A reaction where a compound breaks down into simpler substances

• A reaction where an element replaces another element in a compound

• A reaction where two compounds exchange positive and negative ions to form two new compounds

• A reaction where an element replaces another element in a compound

During a science class, Aiden asked his teacher, "What are individual 'packets' or quanta of light energy called?"

• Lumions

• Photons

• Phosphons

• Fermions

Tags

NGSS.HS-PS4-3