Q: Which reaction is a combustion reaction?

$$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O}$$

Q: Which of the following is a decomposition reaction?

$$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$$

Q: Which equation represents a combination reaction?

$$\text{CaO} + \text{CO}_2 \rightarrow \text{CaCO}_3$$

Q: Which reaction would be classified as a double displacement reaction?

$$\text{Na}_2\text{CO}_3 + 2\text{HCl} \rightarrow 2\text{NaCl} + \text{CO}_2 + \text{H}_2\text{O}$$

Q: In the reaction $$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$$, what is the driving force?

Formation of a gas ($$\text{CO}_2)$$

Question 1

Which type of reaction is represented by the equation $$2	ext{KNO}_3 ightarrow 2	ext{KNO}_2 + 	ext{O}_2$$?

Accepted Answer

Decomposition reaction

Question 2

Given the reaction $$	ext{Na}_2	ext{CO}_3 + 2	ext{HCl} ightarrow 2	ext{NaCl} + 	ext{CO}_2 + 	ext{H}_2	ext{O}$$, what type of reaction is this?

Accepted Answer

Double displacement

Question 3

A 2.15 g sample of a shiny yellow compound contains 0.80 g of potassium, 0.80 g of chromium, and 0.55 g of oxygen. What is the empirical formula of the compound?

Accepted Answer

$$	ext{K}_2	ext{CrO}_4$$

Question 4

Which reaction is a combustion reaction?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O}$$

Question 5

Phosphorus was a chemical warfare agent used in World War I. A 2.15 g sample of phosphorus contains 0.94 g of phosphorus, 0.74 g of oxygen, and 0.47 g of chlorine. What is the empirical formula of the compound?

Accepted Answer

$$	ext{POCl}_3$$

Question 6

Which of the following is a decomposition reaction?

Accepted Answer

$$	ext{CaCO}_3 ightarrow 	ext{CaO} + 	ext{CO}_2$$

Question 7

A compound contains 1.38 g of silver and 0.12 g of oxygen. What is the empirical formula of the compound?

Accepted Answer

$$	ext{Ag}_2	ext{O}$$

Question 8

Which equation represents a combination reaction?

Accepted Answer

$$	ext{CaO} + 	ext{CO}_2 ightarrow 	ext{CaCO}_3$$

Question 9

If you are given the masses of each element in a compound, what is the first step to determine the empirical formula?

Accepted Answer

Convert the masses to moles using the molar mass of each element.

Question 10

A compound contains 0.80 g of potassium, 0.80 g of chromium, and 0.55 g of oxygen. What is the correct mole ratio for the empirical formula?

Accepted Answer

2:1:4

Question 11

Which of the following best describes the process of finding the empirical formula from mass data?

Accepted Answer

Convert masses to moles, divide by the smallest number of moles, and round to the nearest whole number.

Question 12

Which reaction would be classified as a double displacement reaction?

Accepted Answer

$$	ext{Na}_2	ext{CO}_3 + 2	ext{HCl} ightarrow 2	ext{NaCl} + 	ext{CO}_2 + 	ext{H}_2	ext{O}$$

Question 13

In the reaction $$	ext{CaCO}_3 ightarrow 	ext{CaO} + 	ext{CO}_2$$, what is the driving force?

Accepted Answer

Formation of a gas ($$	ext{CO}_2)$$

Question 14

Which of the following is NOT a step in determining the empirical formula?

Accepted Answer

Multiply the mole values by the atomic number

Question 15

A compound contains 1.38 g of silver and 0.12 g of oxygen. What is the mole ratio of silver to oxygen?

Accepted Answer

2:1

General Chemistry Study Guidance: Reaction Types, Empirical Formulas, and Composition Problems

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