Scientists must be careful when combining hydrochloric acid with NaClO, sodium hypochlorite. This is because this chemical reaction produces a yellow, poisonous gas called chlorine gas. Low levels of exposure to chlorine gas can cause fluid build-up in the lungs, and high exposure can cause frostbite to the skin and eyes.

Question

Scientists must be careful when combining hydrochloric acid with NaClO, sodium hypochlorite. This is because this chemical reaction produces a yellow, poisonous gas called chlorine gas. Low levels of exposure to chlorine gas can cause fluid build-up in the lungs, and high exposure can cause frostbite to the skin and eyes.

NaClO + HCl →
NaOH + Cl2
Clear Liquid
Clear Liquid

Clear Liquid

Yellow Gas

Which of these products or reactants provides evidence that a chemical reaction occurs?

A The total number of atoms remains unchangedThe total number of atoms remains unchanged
B A liquid is presentA liquid is present
C Chlorine gas is toxicChlorine gas is toxic
D A yellow gas is produced

👇

1 answer
(click or scroll down)

👇

Answer 1

Bot GPT 4-o mini answered
2 hours ago

The best answer that provides evidence that a chemical reaction occurs is:

**D A yellow gas is produced.**

The production of a new gas (in this case, chlorine gas) indicates that a chemical change has taken place, as new substances have formed as a result of the reaction.