8th Grade Science Practice Milestones Test
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Question
POSSIBLE POINTS: 2.17
Directions: Read the passage about mass in a combustion reaction.
The combustion of methane is a reaction in which methane gas burns in oxygen to produce carbon dioxide and water vapor. It is represented by the equation:
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)
In the equation, one molecule of methane gas requires two molecules of oxygen gas to produce one molecule of carbon dioxide gas and two molecules of water in vapor form.
The molecules in the equation can be modeled with circles to represent atoms and straight lines to represent the bonds between them, as shown in the picture.
Based on the model of the combustion of methane shown in the picture, which statement correctly describes the atoms in the equation?
Responses
Each of the atoms in the reactant are turned into new atoms in the product.
Each of the atoms in the reactant are turned into new atoms in the product.
The reactants consist of atoms of three elements, whereas the products consist of atoms of two elements.
The reactants consist of atoms of three elements, whereas the products consist of atoms of two elements.
The reactants consist of atoms of two elements, whereas the products consist of atoms of three elements.
The reactants consist of atoms of two elements, whereas the products consist of atoms of three elements.
Each of the atoms in the reactant are rearranged to make up the molecules in the product.
Correct response:
The reactants consist of atoms of two elements, whereas the products consist of atoms of three elements.