Question

1 Ca (s) + 2 HF (aq) → 1 CaF2 (s) +1 H2 (g)

Write a word equation for this reaction.

Is the reaction balanced?

Identify the coefficient(s).

Identify the subscript(s).

What is the state of each of the reactants?

What will serve as evidence that a reaction has occurred?

Answer 1

Ca (s) + 2 HF (aq) → CaF₂ (s) + H₂ (g)

Explanation:

We have the following chemical equation:

1 Ca (s) + 2 HF (aq) → 1 CaF₂ (s) + 1 H₂ (g)

Write a word equation for this reaction.

Solid calcium (Ca) is reacting with a solution of hydrofluoric acid (HF) to produce solid calcium fluoride (CaF₂) and gaseous hydrogen (H₂).

Is the reaction balanced?

Yes the reaction is balanced. To balance the chemical equation, the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.

Identify the coefficient(s).

1 for Ca

2 for HF

1 for CaF₂

1 for H₂

Identify the subscript(s).

2 for fluorine in CaF₂

2 of hydrogen in H₂

If the subscripts are missing we consider them to be 1.

What is the state of each of the reactants?

Ca (s) - solid

HF (aq) -  aqueous (dissolved in water)

CaF₂ (s) - solid

H₂ (g) - gaseous

What will serve as evidence that a reaction has occurred?

The presence of hydrogen bubbles, as seen as a effervescence in the reaction beaker,  will tell us that the reaction occurred.

Learn more about:

balancing chemical equations

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Answer 2

Word equation for the reaction: 1 mole of solid Calcium reacts with 2 moles of aqueous hydrogen fluoride to form 1 mole of calcium fluoride and 1 mole of hydrogen gas.

Yes, the reaction is balanced.

The coefficient of Ca in the reaction is 1, HF is 2, $\rm CaF_2$ is 1, and $\rm H_2$ is 1.

In the given equation, the subscripts for Ca is 1, in HF H is 1, and F is 1, Ca in  $\rm CaF_2$ is 1, and F is 2, and h has 2 in $\rm H_2$.

The reactant Ca is in solid-state, and $\rm CaF_2$ is in the liquid state.

The formation of a precipitate of Calcium fluoride, and elimination of hydrogen gas evidence the reaction has occurred.

The answers can be explained as follows:

• The word equation has the reaction written with products in sentence form. The word equation for the given reaction will be:

1 mole of solid Calcium reacts with 2 moles of aqueous hydrogen fluoride to form 1 mole of calcium fluoride and 1 mole of hydrogen gas.

• The reaction is said to be balanced when the number of atoms of each element on the product side and the reactant side are equal.

In the given reaction, the element on the product side and reactant side are equal. Thus, the reaction is balanced.

• The coefficient has been the number that has been written in front of the compound in a balanced chemical equation.

The coefficient of Ca in the reaction is 1, HF is 2, $\rm CaF_2$ is 1, and $\rm H_2$ is 1.

• The subscripts have been the number of the alphabets that have been written to a number in subscripts. Subscripts give the number of atoms of each element.

In the given equation, the subscripts for Ca is 1, in HF H is 1, and F is 1, Ca in  $\rm CaF_2$ is 1, and F is 2, and H has 2 in $\rm H_2$.

• The reactant Ca is in solid-state, and $\rm CaF_2$ is in the liquid state.

• The formation of a precipitate of Calcium fluoride, and elimination of hydrogen gas evidence the reaction has occurred.

For more information about the chemical reaction, refer to the link:

https://brainly.com/question/1689737