Balanced and Unbalanced Chemical Equations

Determined whether the following equation is balanced or unbalanced. Ag + O_{2 --->} 2Ag₂O

• Balanced

• Unbalanced

Answer explanation

The equation is unbalanced because there are 4 silver (Ag) atoms and 2 oxygen (O) atoms on the product side (2Ag2O), but only 1 silver atom and 2 oxygen atoms on the reactant side. Thus, the correct choice is 'Unbalanced'.

Tags

NGSS.MS-PS1-5

Determine whether the following equations is balanced or unbalanced. H₄ + O₂ ---> 2H₂O

• Balanced

• Unbalanced

Answer explanation

The equation H4 + O2 -> 2H2O is balanced because there are 4 hydrogen atoms and 2 oxygen atoms on both sides of the equation. Thus, the correct choice is 'Balanced'.

Tags

NGSS.MS-PS1-5

Determine whether the following equation is balanced or unbalanced. 4P +5O_{2 --->} 2P₂O₅

• Balanced

• Unbalanced

Answer explanation

To check if the equation is balanced, count the atoms of each element on both sides. Left: 4 P and 10 O. Right: 4 P and 10 O. Since both sides have equal numbers of each atom, the equation is balanced.

Tags

NGSS.MS-PS1-5

Determine whether the following equation is balanced or unbalanced. H₂ + Br₂ ---> 2HBr

• Balanced

• Unbalanced

Answer explanation

The equation H2 + Br2 -> 2HBr is balanced because there are 2 hydrogen atoms and 2 bromine atoms on both sides of the equation. Thus, the correct choice is 'Balanced'.

Tags

NGSS.MS-PS1-5

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl₂ ---> FeCl₃

• Balanced

• Unbalanced

Answer explanation

The equation 2Fe + 3Cl2 -> FeCl3 is unbalanced because there are 2 iron (Fe) atoms and 6 chlorine (Cl) atoms on the left, but only 1 iron and 3 chlorine on the right. Thus, the correct choice is 'Unbalanced'.

Tags

NGSS.MS-PS1-5

In order for an equation to be balanced, there must be ...

• an equal amount of atoms on both sides

• a greater mass on the product side

• a greater mass on the reactant side

• elements with the same atomic # on both sides

Answer explanation

For an equation to be balanced, the law of conservation of mass states that the number of atoms must be the same on both sides. Therefore, the correct choice is 'an equal amount of atoms on both sides'.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following equations is balanced?

• P₄ + 3O₂ ---> 2P₂O₃

• N₄ + 3F₂ ---> 2NF₃

• 2LiF + Br₂ ---> 2LiBr + F₄

Answer explanation

The equation P4 + 3O2 -> 2P2O3 is balanced because it has 4 phosphorus and 6 oxygen atoms on both sides. The other equations do not have equal numbers of atoms for at least one element, making them unbalanced.

Tags

NGSS.MS-PS1-5

In this image, what are the information in red is called the_______.

• Product

• Reactant

• Chemical Subscript

• Coefficient

Answer explanation

The information in red represents the reactants in a chemical equation. Reactants are the substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Tags

NGSS.MS-PS1-2

In this image, what are the information to the right of the arrow (in black) is called the_______.

• Product

• Reactant

• Chemical Subscript

Answer explanation

The information to the right of the arrow represents the products of a chemical reaction, which are the substances formed as a result of the reaction. Therefore, the correct answer is 'Product'.

Tags

NGSS.MS-PS1-2

The law of conservation of mass states that....

• Matter can be made

• Matter can be destroyed

• Matter can neither be made or destroyed

• Matter can evaporate

Answer explanation

The law of conservation of mass states that matter can neither be made nor destroyed. This means that in any chemical reaction, the total mass of the reactants equals the total mass of the products.

Tags

NGSS.MS-PS1-5