Table of Contents
- 1 How do you identify a solution in chemistry?
- 2 What do you think is the reaction of the white powder to water vinegar?
- 3 What tests can we perform to identify an unknown substance?
- 4 When water is added to white powder A?
- 5 When water is added to a white powder a vigorous?
- 6 Why is it important to be able to identify unknown substances?
- 7 How does the unknown react with each test solution?
- 8 What makes a person a good problem solver?
- 9 How to answer behavioral questions about problem solving?
How do you identify a solution in chemistry?
In precipitation, you can add a chemical to a solution and observe what precipitate forms. Acid/base tests will tell you the pH of the substance and whether it is an acid, base or neutral substance. Flame tests are used to identify ions based on the color the flames emit.
What do you think is the reaction of the white powder to water vinegar?
When water is added, the powdered acid dissolves and reacts with the sodium bicarbonate to produce carbon dioxide bubbles. Baking soda is pure sodium bicarbonate, which reacts with acidic solutions such as vinegar to produce carbon dioxide bubbles.
What tests can we perform to identify an unknown substance?
How Do We Approach an Unknown Substance
- Gas Chromatography (GC)
- Gas Chromatography Mass Spectroscopy (GC-MS)
- Ion Chromatography (IC)
- High Performance Liquid Chromatography (HPLC)
- Dispersive Raman Spectroscopy.
- Fourier Transfer Infrared Spectroscopy (FTIR)
How can an unknown substance be identified using physical and chemical properties?
Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. Physical and chemical properties can be used to classify a substance as ionic or molecular.
Which properties can be used to identify an unknown substance?
Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties.
When water is added to white powder A?
When water is added to the White powder of calcium oxide or quick lime it forms the slaked lime which is used in washing with release of large amount of heat. calcium oxide reacts with cold water to form calcium hydroxide which is a base .
When water is added to a white powder a vigorous?
when water is added to a white powder A vigorous reaction takes place and large amount of heat is released. ‘A’ is also used for whitewashing.
Why is it important to be able to identify unknown substances?
Detecting known substances, and determining their quantity, is also important. In manufacturing, it is important to detect any impurities in the product and to determine whether they are present in a significant amount. Analytical characterization is critical in pharmaceutical products, for instance.
How do scientific tests help determine the properties of substances?
The chemical properties of a substance can be determined by performing experiments that use specific materials or processes with known characteristics. If a material affects the substance in a given way, the substance has a particular property. If a process changes the substance, more properties can be deduced.
How can a student identify an unknown substance?
Students will be able to identify and control variables to develop a test to identify an unknown powder. Students will be able to explain that a substance reacts chemically in characteristic ways and that these characteristics can be used to identify an unknown substance.
How does the unknown react with each test solution?
The unknown reacted with each test solution the same way baking powder did. Explain that each substance is made up of certain molecules which interact with the molecules in each test liquid in a characteristic way. Some of these interactions result in a chemical reaction and others do not.
What makes a person a good problem solver?
Determination gives these people the motivation to push through and keep moving forward. People who are result-oriented have their full focus on getting to the desired outcome. As discussed in the introduction, problem-solving questions fall into the behavioral category of interview questions.
How to answer behavioral questions about problem solving?
To answer behavioral questions about your problem-solving skills, you need to ensure that you provide the interviewer with specific details about the situation you were in, your task in that situation, the action you took, and the specific results that came out of those actions. In short, this is called the STAR-method of providing an answer.