What is the main goal of balancing a chemical equation?

• To ensure the number of molecules is the same on both sides

• To ensure the number of electrons is the same on both sides

• To ensure the number of atoms is the same on both sides

• To ensure the number of compounds is the same on both sides

Tags

NGSS.MS-PS1-5

In a chemical equation, what do we call the substances on the left side of the arrow?

• Coefficients

• Catalysts

• Reactants

• Products

What is a coefficient in a chemical equation?

• A number that indicates the amount of energy released

• A number that multiplies with everything in front of it

• A number that shows the charge of an ion

• A number that indicates the temperature of the reaction

Tags

NGSS.MS-PS1-5

If you have 2 chlorine atoms on the reactant side and 1 chlorine atom on the product side, what should you do?

• Add a coefficient to the chlorine on the product side

• Remove a chlorine atom from the reactant side

• Add a subscript to the chlorine on the product side

• Add a coefficient to the chlorine on the reactant side

Tags

NGSS.MS-PS1-5

When balancing the equation Na + Cl2 → NaCl, what coefficient should be placed in front of NaCl to balance chlorine?

• 3

• 2

• 4

• 1

Tags

NGSS.MS-PS1-5

What should you do if you encounter odd numbers of atoms while balancing an equation?

• Add more products

• Convert them to even numbers

• Ignore them

• Add more reactants

Tags

NGSS.MS-PS1-5

In the equation 2Al + 3O2 → 2Al2O3, what is the total number of oxygen atoms on the reactant side?

• 2

• 3

• 6

• 9

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the simplest ratio in a balanced chemical equation?

• The ratio of the number of electrons

• The ratio of the coefficients

• The ratio of the number of atoms

• The ratio of the number of molecules

Why is it important to use whole numbers when balancing chemical equations?

• To ensure the reaction is endothermic

• To maintain the law of conservation of energy

• To ensure the reaction is exothermic

• To maintain the law of conservation of mass

Tags

NGSS.MS-PS1-5

In the final example, what is the total number of oxygen atoms on the product side after balancing?

• 6

• 8

• 9

• 10

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5