Ms. Pitt set up a classroom demonstration to show what happens when a sample of zinc metal is add a.ed to a flask containing hyd

Question

2 years ago

7

Ms. Pitt set up a classroom demonstration to show what happens when a sample of zinc metal is add a.ed to a flask containing hyd

rochloric acid (HCl). The diagram shows what the students in the classroom observed during the demonstration. The students made two other observations: The flask felt warmer after adding the sample. The sample became smaller over time. Which of the following is NOT an evidence of a chemical reaction in this example.
A. Gas collected in the balloon
B.Temperature of sample is increased
c.Volume of HCl remains the same
D.Size of the zinc has become smaller

Chemistry

2 answers:

Nikolay [14] · Answer 1 · 2023-03-25T23:48:22+03:00

Nikolay [14]2 years ago

7 0

Answer:

volume of HCl remains the same

Greeley [361] · Answer 2 · 2023-03-26T01:33:32+03:00

Reaction

Zn (s) + 2HCl (aq) ⇒ ZnCl₂ (s) + H₂ (g)

A. gas H₂ collected: true

B. Every chemical reaction produces or absorbs heat. In chemistry, this effect is described as the enthalpy of a reaction.

This reaction releases heat (exothermic) and causes the temperature to increase: true

C. the volume of HCl will decrease because it reacts: false

D. the size of the zinc metal decreases as it reacts: true