Which of the following would be considered a source of error in an experiment?

1 answer:

Colt1911 [192]3 years ago

4 0

D. Temperature readings are made late in the day, when everyone is tired and eager to go home.

Errors are what makes your measurement invalid and unreliable. There are two types of error which is called the systematic error and the random error. Each error has different sources. Words that were mentioned –invalid and unreliable are very important key aspects to determine that your measure is truly accurate and consistent. Some would recommend using the mean method, doing three trials in measuring and getting their mean, in response to this problem.

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Compare the physical and chemical properties of a compound to those of the elements of which it is composed

zepelin [54]

Answer:

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water $H_2O$

$2H_2O(l)\rightarrow 2H_2(g+O_2(g)$

Physical property is defined as the property of a substance which becomes evident during physical changes. Water is liquid at room temperature whereas hydrogen and oxygen are gases at room temperature.

Chemical property is defined as the property of a substance which becomes evident during chemical changes. Water reacts with metals to form bases, hydrogen reacts with metals to form hydrides and oxygen reacts with metals to form oxides.

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4 years ago

Which of the above is the macromolecule that contains starch and glycogen? Carbohydrates II. Lipids III. Proteins IV. Nucleic Ac

Eduardwww [97]

Carbohydrates

I'm not sure but....Please correct me if I'm wrong!! :)

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4 years ago

What percentage of the global population lives in the United States?

bekas [8.4K]

Answer: 4.25%

Explanation:

As at Friday, May 28, 2021, the population of the United States of America is about 332,754,370. The population of the world is about 7,868,904,000.

Therefore, the percentage of the global population lives in the United States is about 4.25% that's 332,754,370/7,868,904,000 × 100%.

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3 years ago

Describe how the role of phloem would be affected if the leaves start to die off. Tell what phloem does in a plant.

Zarrin [17]

Describe how phloem is affected if the leaves start to die off. (3 points) The phloem is effected by the deprivation of water from the disease of the tree, as a result the metabolism of the plant will shift down ward causing the phloem to decrease due to the dying of the leaves.

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3 years ago

_________8. Which of the following is probably evolved first?

Burka [1]

Answer:

I think D) Glycolysis

Explanation:

Glycolysis is the first pathway used in the breakdown of glucose to extract energy. It takes place in the cytoplasm of both prokaryotic and eukaryotic cells. It was probably one of the earliest metabolic pathways to evolve since it is used by nearly all of the organisms on earth.

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3 years ago