1-7 Conservation in Chemical Reactions SQ

Select the best statement in order to complete the model.

• Two carbon dioxide molecule should be added to the product side of the equation.

• One carbon atom and two oxygen atoms are needed to balance the equation.

• One diatomic oxygen should be removed from the reactant side.

• One unbonded carbon atom should be added to the product side of the equation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Given the equation: N₂ + O₂ → NO₂, what has to be done to properly balance the equation so that the law of conservation of mass is shown?

• Add a coefficient of 2 in front of the O₂ on the reactant side and a coefficient of 2 in front of NO₂ on the product side.

• Add a coefficient of 2 in front of O₂ on the reactant side.

• Add a subscript of 2 after N on the product side.

• Remove the subscript of 2 after N on the reactants side.

Tags

NGSS.MS-PS1-5

A model for a potential chemical reaction is shown here. Evaluate the model and the reaction shown. Which statement(s) are correct about this model?

• Conservation of matter is not observed because there are different numbers of molecules in the reactants and the products.

• Conservation of matter is observed because there are the same number of each atom on both sides of the reaction.

• Conservation of matter is not observed because some of the atoms are converted into energy in the reaction.

• Conservation of matter is not observed because the atoms are rearranged from one side of the reaction to the other.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

3 HClO  --> 2 HClO₂ + HCl

Which of the following statements best describes the above chemical equation?

• No.  The number of O atoms is not balanced.

• No.  The total number of Cl atoms is not balanced.

• Yes, there are the same number of atoms of each element on both the reactant and product sides of the equation.

• No.  The total number of H atoms is not balanced.

Tags

NGSS.MS-PS1-5

Which of the following chemical equations is INCORRECTLY balanced?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Match the terms with the expressions listed.

Can't be created or destroyed

• Conservation of ENERGY

• Conservation of MASS

• Both

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Match the terms with the expressions listed.

Mass of reactants = mass of products

• Conservation of ENERGY

• Conservation of MASS

• Both

Tags

NGSS.MS-PS1-5

Match the terms with the expressions listed.

26 grams of NaCl created from 13 grams of Na and 13 grams of Cl.

• Conservation of ENERGY

• Conservation of MASS

• Both

Tags

NGSS.MS-PS1-5

Match the terms with the expressions listed.

Energy of the reactions = Energy of products

• Conservation of ENERGY

• Conservation of MASS

• Both

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Match the terms with the expressions listed.

Endothermic and Exothermic

• Conservation of ENERGY

• Conservation of MASS

• Both

Tags

NGSS.MS-PS1-5