Table of Contents
What is the purpose of testing distilled water with each indicator in a lab activity with indicator solutions?
The purpose of testing distilled water with each indicator was so that there was a negative control in the experiment. If there aren’t any controls, then there’s nothing to compare the results of the experiment to.
What was the purpose of testing distilled water with Benedict’s reagent quizlet?
The Benedict test allows you to see if a substance contains starch that can be broken down into simple sugars. test for the presence of simple sugars such as maltose and glucose.
Why is it easy to tell lipids and carbohydrates apart when viewing a model of each?
Even though lipids and carbohydrates are made from the same elements (carbon, hydrogen, and oxygen), it is easy to tell them apart when viewing a model of each because they all have different amounts of carbon, hydrogen, and oxygen, which causes a difference in their overall shape, thus they appear different when you.
Can you have more than one type of molecule working Why would that be helpful quizlet?
Explain why it is an advantage for us to eat foods that contain more than one type of molecule. It is an advantage to eat foods that contain more than one type of molecule because it helps to reach the needed amount without having to eat more food.
What is the purpose of testing distilled water in tube 3?
Ch4(Starch Lab)What is the purpose of testing distilled water in tube 3? To eliminate the possibility that the water portion of the potato and onion solutions causes a positive result.
Why is distilled water used in this experiment quizlet?
water is not fermented. why is distilled water used in this experiment? it has no sugar, so it is an experimental control. why is it important to stir the yeast before adding it to the test tubes?.
What was the purpose of testing distilled water with Benedict’s reagent?
In lab, we used Benedict’s reagent to test for one particular reducing sugar: glucose. Benedict’s reagent starts out aqua-blue. As it is heated in the presence of reducing sugars, it turns yellow to orange. The “hotter” the final color of the reagent, the higher the concentration of reducing sugar.
Why did you test water with Benedict’s reagent?
Why did you use Benedicts solution to test the diffused water? This served as our negative control substance.
What was the purpose of test tube 1?
Test tubes are used to hold, mix, and heat chemical experiments.
How is the paper test for lipids different than the tests for proteins and carbohydrates?
Biuret solution is used to test for protein. It is royal blue initially and changes to violet when it reacts with protein. Brown paper bags are used to test for lipids. The paper bag becomes translucent (allows light to pass through) in the presence of lipids.
How do lipids and carbohydrates work together?
Complex carbohydrates (e.g. polysaccharides) and lipids both contain a lot of chemical energy and can be used for energy storage. Complex carbohydrates and lipids are both insoluble in water – they are not easily transported. Carbohydrates and lipids both burn cleaner than proteins (they do not yield nitrogenous wastes.
Why is carbohydrate called carbohydrate?
The American Diabetes Association notes that carbohydrates are the body’s main source of energy. They are called carbohydrates because, at the chemical level, they contain carbon, hydrogen and oxygen. There are three macronutrients: carbohydrates, protein and fats, Smathers said.
Why did this other type of molecule seem like A likely candidate?
The other type of molecule that some scientists thought might carry genetic information were proteins. Proteins seemed like a likely candidate because there are many different types of proteins, and they have many shapes and functions within the cell, just like there are many different types of inheritable traits.
Why did scientists think protein was genetic material?
Most researchers thought protein was the genetic material because; proteins were macromolecules with great heterogeneity and functional specificity. Little was known about nucleic acids. The physical and chemical properties of DNA seemed too uniform to account for the multitude of inherited traits.
When an atom or molecule gains one or more electrons it is said to be <UNK>?
When an atom or molecule gains one or more electrons, it is said to be: Reduced.
What purpose does the distilled water serve?
All water — no matter if it comes from a natural spring, artesian well, or regular tap — may have trace but safe amounts of minerals, bacteria, pesticides, and other contaminants. Distilling rids water of all those impurities. It also removes more than 99.9% of the minerals dissolved in water.
What is the purpose of the water test tube?
Test tubes are widely used by chemists to handle chemicals, especially for qualitative experiments and assays. Their spherical bottom and vertical sides reduce mass loss when pouring, make them easier to wash out, and allow convenient monitoring of the contents.
Why is distilled water used for compounding?
In pharmaceutical manufacturing, it is important that high purity water is used because contaminants in tap water could interfere with other ingredients and cause a chemical reaction. In this industry, distilled water is used in products like: Active pharmaceutical ingredients. Active pharmaceutical intermediates.
What was the purpose of this experiment quizlet?
The purpose of an experiment is to find out whether changes in one variable (lets call it X) cause changes in another variable (lets call it Y) To put it more concisely, we want to find out how X affects Y.
Which of the tested temperatures is optimum for yeast fermentation?
The optimum temperature range for yeast fermentation is between 90˚F-95˚F (32˚C-35˚C). Every degree above this range depresses fermentation.
What do your observations tell you about the presence of glucose starch and Iki in the dialysis bag and the beaker before and after the experiment?
The results show that the water, glucose, and IKI molecules were small enough to pass through the selectively permeable membrane. The starch didn’t leave the beaker because its molecules were too large to pass through the selectively permeable membrane’s pores.
