8.6B & 7.6B Mastery MiniQuiz

A chemist analyzes the reaction: 2Na + Cl₂ → 2NaCl How does the periodic table help confirm that mass is conserved in this reaction?

• The periodic table shows that the total number of atoms remains the same.

• The periodic table identifies the products of the reaction.

• The periodic table predicts the reaction rate.

• The periodic table determines if the reaction is endothermic or exothermic.

Tags

NGSS.MS-PS1-5

Which statement best explains why oxygen (O₂) is written as a diatomic molecule in chemical equations?

• Oxygen has a full outer shell and does not react.

• Oxygen naturally exists as pairs of atoms due to its electron configuration.

• Oxygen is a noble gas and forms single atoms.

• Oxygen atoms gain protons when bonding with other elements.

A student examines the reaction Fe + CuSO₄ → FeSO₄ + Cu. Using the periodic table, which element is being replaced, and why?

• Iron replaces copper because it is more reactive.

• Copper replaces iron because it has a higher atomic mass.

• Sulfur is removed because it is a nonmetal.

• Oxygen is added to make a more stable product.

Tags

NGSS.MS-PS1-2

Which of the following best describes why carbon (C) is found in so many compounds?

• Carbon is the most abundant element on Earth.

• Carbon has four valence electrons, allowing it to form multiple bonds.

• Carbon can only bond with other nonmetals.

• Carbon does not react with other elements.

In the reaction C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, how does the periodic table help confirm that this follows the law of conservation of mass?

• It proves that the products weigh less than the reactants.

• It shows that the total number of each type of atom is equal on both sides.

• It identifies which atoms will react faster.

• It determines which substances are in gas form.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A student sees this reaction: H₂ + Cl₂ → 2HCl. What does the periodic table reveal about this process?

• Hydrogen and chlorine share electrons equally.

• Chlorine donates electrons to hydrogen.

• Hydrogen and chlorine form ionic bonds.

• Hydrogen and chlorine are both diatomic gases and react in a 1:1 ratio.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element in the reaction Mg + 2HCl → MgCl₂ + H₂ is the most reactive?

• Magnesium (Mg)

• Hydrogen (H₂)

• Chlorine (Cl₂)

• None, all elements are equally reactive.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A scientist studies the equation CaCO₃ → CaO + CO₂. What information from the periodic table supports that mass is conserved?

• The atomic number of calcium, carbon, and oxygen stays the same.

• The number of molecules changes, proving mass is destroyed.

• The atomic masses of the products are greater than the reactants.

• The periodic table predicts the type of bond formed in the reaction.

Tags

NGSS.MS-PS1-5

When balancing a chemical equation, what role does the periodic table play?

• It identifies the atomic masses of reactants.

• It ensures equal numbers of each type of atom on both sides.

• It predicts the speed of the reaction.

• It determines if the reaction is exothermic.

Tags

NGSS.MS-PS1-1

Which of the following is an example of a synthesis reaction, based on periodic table data?

• H₂ + O₂ → H₂O

• NaCl → Na + Cl₂

• C₆H₁₂O₆ → CO₂ + H₂O

• Fe + CuSO₄ → FeSO₄ + Cu

Tags

NGSS.MS-PS1-1