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3 years ago

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Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of co

nservation of mass, how much magnesium oxide will there be after the chemical change is complete?

2 answers:

irina1246 [14]3 years ago

4 0

mass- mgo= 40g..............

Katyanochek1 [597]3 years ago

3 0

Answer: it's 40g

Explanation:

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Which of these organisms is a vertebrate?

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Answer:

vertebrate, animals with a backbone, and invertebrate, animals without a backbone

Explanation:

A. worm - no because a worm has no back bone

B- Chimpanzee- Yes because they have a backbone

C. Bacterium- no because it is a bacteria

D. Grass- no because no backbone

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Graded Assignment

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Answer:

the tests and indicators used for detection of starch, Albumin, Vegetable oil and milk are explained below

Explanation:

Iodine indicator

For presence of starch in biological molecules, iodine test is used. Few drops of iodine solution are added to the sample (containing starch carbohydrate). If the color turns blue-black, it will indicate the presence of starch in the solution and vice versa.

Iodine test is commonly used for identification starch.

Sodium hydroxide/Copper sulfate test for detection of Albumin

This test is called as Biuret performed for the detection of proteins (Albumin in this case). In this experiment, Biuret reagent is used which is combination of copper sulfate and sodium hydroxide. Few ml of biuret reagent is added to the unknown sample for detection of albumin. A colour change from blue to violet or dark blue will indicate the presence of albumin (protein).

Sudan III Test for identification of lipids.

Sudan III is a dye used to give colour to non-polar substances. Sudan III test is used in general lab for detection of lipids in unknown solution. Sudan III is red brown in colour and will stain the oil red when comes in contact in a solution. It will form 2 layers, one will be oil with red layer and the other is water layer.

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As pure milk composed of Fat, carbohydrate’s and Proteins. So for detection of milk all tests are recommended.

Biuret test for detection of protein

Benedicts test for carbohydrates

Sudan III test for detection of fats.

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. 2.What was the role of the water test tube in each phase?

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Ventilation (Pulmonary) AKA Breathing

Explanation:

Pulmonary ventilation is often known as breathing. It is the means through which air moving into the lungs in the course of inspiration (inhalation) and away from the lungs at expiration (exhalation). Air flows as a result of variations in pressure between the atmosphere and the gases within the lungs.

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