Teacher, create graded and non-graded assignments in minutes!

At Teachy you have access to thousands of questions, graded and non-graded assignments, projects, and lesson plans.

Free Registration

Discipline: Chemistry

Question topic: Types of Phenomena

Source: Originais Teachy

Level of difficulty: Medium

(Originais Teachy 2023) - Question Medium of Chemistry

Joana was observing different phenomena happening in the kitchen. She noticed that some changes were reversible and others were not. She also noticed that some changes only altered the appearance of objects, while others caused deeper transformations. Based on this information, classify the phenomenon of boiling water into one of the following types:
Physical phenomenon
Chemical phenomenon
Organoleptic phenomenon
Combination of physical and chemical phenomena
Combination of physical and organoleptic phenomena


Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur id consequat justo. Cras pellentesque urna ante, eget gravida quam pretium ut. Praesent aliquam nibh faucibus ligula placerat, eget pulvinar velit gravida. Nam sollicitudin pretium elit a feugiat. Vestibulum pharetra, sem quis tempor volutpat, magna diam tincidunt enim, in ullamcorper tellus nibh vitae turpis. In egestas convallis ultrices.

Answer key available only for registered teachers.
Register at Teachy and get access now!

Teachy originals
Those who search for this subject, also viewed these questions...
Question 1:


During an experiment carried out in chemistry class, three different phenomena were observed when a piece of paper was folded, burned, and its properties such as color and texture were analyzed. (1) Identify and classify each of these phenomena as physical, chemical, or organoleptic. (2) Explain the characteristics that justify the classification of each of them. (3) Give examples of other phenomena that can be classified in the same category as each of the mentioned phenomena.
Teachy originals
Question 2:


During the Chemistry class, you learned about physical and chemical phenomena, as well as their respective occurrence processes. In the school laboratory, it is possible to perform experiments to exemplify such events. In one of these experiments, three different materials are used: an iron bar, an ice cube, and an effervescent tablet. (a) Identify and classify the phenomena that occur when the iron bar is heated, the ice cube is melted, and the effervescent tablet is placed in water, respectively. (b) Describe how you could identify if there is a change in the substance (whether physical or chemical) during each experiment. (c) Choose one of the experiments and explain, based on your observations, how it is possible to verify if it is a physical or chemical phenomenon.
Teachy originals
Question 3:


Source: UNESP
Question 4:


A chemist is studying the rate of a particular elementary reaction in the lab. He notes down that ten moles of gas A are reacting with five moles of gas B in a closed container at a constant temperature. At the end of one hour, he observes that the concentration of gas A has reduced to half of its initial value, while the concentration of gas B remains the same. Given that the rate of this elementary reaction is described by the equation: Rate = k[A][B]^2, where k is the rate constant, [A] and [B] are the molar concentrations of gases A and B respectively. Can you calculate the value of the rate constant k at the end of one hour? (Assume the volume of the container is 10L)
Teachy originals
Did you like these questions? We have more than 100,000 like these for you, teacher!
Save time with Teachy!
With Teachy, you have access to:
Classes and contents
Automatic grading
Assignments, questions and materials
Personalized feedback
Teachy Mascot
BR flagUS flag
Terms of usePrivacy PolicyCookies Policy

2023 - All rights reserved

Follow us
on social media
Instagram LogoLinkedIn LogoTwitter Logo