Answered

Discover the answers to your questions at Westonci.ca, where experts share their knowledge and insights with you. Connect with a community of experts ready to help you find solutions to your questions quickly and accurately. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform.

Question 4 of 10
Which of the following reactions shows a physical change?

A. [tex]\[NaCl (s) \rightarrow NaCl (aq)\][/tex]
B. [tex]\[2 CH_3OH (\ell) + 3 O_2 (g) \rightarrow 2 CO_2 (g) + 4 H_2O (\ell)\][/tex]
C. [tex]\[2 AgNO_3 (aq) + CaBr_2 (aq) \rightarrow 2 AgBr (s) + Ca \left( NO_3 \right)_2 (aq)\][/tex]
D. [tex]\[H_2 (g) + O_2 (g) \rightarrow H_2O (\ell)\][/tex]

Sagot :

GinnyAnswer
To determine which reaction shows a physical change, let's analyze each option.

A. [tex]\( \text{NaCl (s)} \rightarrow \text{NaCl (aq)} \)[/tex]

In this reaction, solid sodium chloride (NaCl) is dissolved in water to form an aqueous solution of NaCl. The dissolution process involves the separation of NaCl into its constituent ions, [tex]\( \text{Na}^+ \)[/tex] and [tex]\( \text{Cl}^- \)[/tex], in water. Importantly, there is no alteration of the chemical structure of NaCl; only its physical state changes from solid to aqueous. This represents a physical change.

B. [tex]\( 2 \text{CH}_3\text{OH} (\ell) + 3 \text{O}_2 (g) \rightarrow 2 \text{CO}_2 (g) + 4 \text{H}_2\text{O} (\Lambda) \)[/tex]

This equation describes the combustion of methanol ([tex]\( \text{CH}_3\text{OH} \)[/tex]) in the presence of oxygen ([tex]\( \text{O}_2 \)[/tex]), resulting in the formation of carbon dioxide ([tex]\( \text{CO}_2 \)[/tex]) and water ([tex]\( \text{H}_2\text{O} \)[/tex]). New products are formed as a result of this process, indicating a chemical change rather than a physical change.

C. [tex]\( 2 \text{AgNO}_3 (aq) + \text{CaBr}_2 (aq) \rightarrow 2 \text{AgBr} (s) + \text{Ca(NO}_3)_2 (aq) \)[/tex]

This reaction describes a precipitation reaction where aqueous solutions of silver nitrate ([tex]\( \text{AgNO}_3 \)[/tex]) and calcium bromide ([tex]\( \text{CaBr}_2 \)[/tex]) react to produce solid silver bromide ([tex]\( \text{AgBr} \)[/tex]) and aqueous calcium nitrate ([tex]\( \text{Ca}(\text{NO}_3)_2 \)[/tex]). The formation of new substances (silver bromide and calcium nitrate) indicates a chemical change.

D. [tex]\( \text{H}_2 (g) + \text{O}_2 (g) \rightarrow \text{H}_2\text{O} (M) \)[/tex]

This equation represents the reaction between hydrogen gas ([tex]\( \text{H}_2 \)[/tex]) and oxygen gas ([tex]\( \text{O}_2 \)[/tex]) to form water ([tex]\( \text{H}_2\text{O} \)[/tex]). The formation of water from hydrogen and oxygen gases is a chemical change.

Given this analysis, we can see that option A ([tex]\( \text{NaCl (s)} \rightarrow \text{NaCl (aq)} \)[/tex]) is the only reaction that represents a physical change since it involves a dissolution process without the formation of any new substances.

Thus, the correct answer is:

1.
We hope our answers were helpful. Return anytime for more information and answers to any other questions you may have. Thank you for choosing our platform. We're dedicated to providing the best answers for all your questions. Visit us again. Thank you for visiting Westonci.ca. Stay informed by coming back for more detailed answers.