A mole is $$6.022 \times 10$$^{23}$$ particles of a substance.

Question 1

Which type of reaction is represented by the equation $$2H_2O_2 \rightarrow 2H_2O + O_2$?

Accepted Answer

Decomposition

Question 2

A reaction where two compounds exchange elements to form two new compounds is called:

Accepted Answer

Double replacement reaction

Question 3

Which of the following best describes a combustion reaction?

Accepted Answer

A carbon-containing compound reacts with $$O_2 to $$produce $$CO_2$$ and $$H_2O$$

Question 4

Balance the following equation: $$Fe_2O_3 + C \rightarrow Fe + CO. $$What are the correct coefficients?

Accepted Answer

$$2, 3, 4, 3$$

Question 5

Which reaction type is illustrated by $$2Al(s) + 3H_2SO_4(aq) \rightarrow Al_2$(SO_4$)_3(s) + 3H_2(g)$$?

Accepted Answer

Single replacement

Question 6

In the reaction $$Na_2SO_4(aq) + 2AgNO_3(aq) \rightarrow Ag_2SO_4(s) + 2NaNO_3(aq)$$, what type of reaction is occurring?

Accepted Answer

Double replacement

Question 7

Which of the following is a correct statement about balancing chemical equations?

Accepted Answer

Coefficients are used to balance the number of atoms for each element.

Question 8

What is the balanced equation for the reaction: $$Al + S \rightarrow Al_2S_3$$?

Accepted Answer

$$2Al + 3S \rightarrow Al_2S_3$$

Question 9

Which of the following reactions is an example of a decomposition reaction?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 10

During incomplete combustion of propane ($$C_3H_8$$), which toxic gas is produced?

Accepted Answer

$$CO$$

Question 11

Which equation represents a combination reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 12

In a single replacement reaction, which of the following is true?

Accepted Answer

One element replaces another in a compound.

Question 13

Which of the following is the correct balanced equation for the reaction: $$Al + FeO \rightarrow Fe + Al_2O_3$$?

Accepted Answer

$$2Al + 3FeO \rightarrow 3Fe + Al_2O_3$$

Question 14

Which of the following is NOT a characteristic of a balanced chemical equation?

Accepted Answer

Chemical formulas of reactants and products are changed to balance.

Question 15

A barbecue grill uses propane ($$C_3H_8) as $$fuel. What type of reaction occurs when propane burns in air?

Accepted Answer

Combustion

Question 16

Which of the following equations is an example of a double replacement reaction?

Accepted Answer

$$Na_2SO_4 + 2AgNO_3 \rightarrow Ag_2SO_4 + 2NaNO_3$$

Question 17

If an equation contains a pure element as a product or reactant, what is the recommended strategy for balancing?

Accepted Answer

Balance the pure element last.

Question 18

Which of the following is the correct net ionic equation for the precipitation reaction between $$Na_2SO_4$$ and $$AgNO_3$$?

Accepted Answer

$$2Ag^+ (aq) + SO_4$^{2-} (aq) \rightarrow Ag_2SO_4 (s)$$

Question 19

Which of the following best describes the mole concept?

Accepted Answer

A mole is $$6.022 	imes 10$$^{23}$$ particles of a substance.

Chemical Reactions and Balancing Equations – Study Notes

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