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Chemistry

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Kara Wolf

Lvl 10
โˆ™ 2021-10-27 18:34:43
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Cards in this guide (22)
How many protons are in an oxygen atom

Oxygen has 8 protons in the atom.

What happens when an atom gains an electron

It becomes a negative ion.

Is cooking oil and vegetable oil the same thing

Not exactly; it's true to say that all cooking oils are vegetable oils, but not all vegetable oils are cooking oils. For example, linseed oil is vegetable oil, but can't be used for cooking.

Why are some people fat and others are not

One reason people are fat is because they eat and eat and eat and don't exercise. Another reason is because some people have fast working calorie burning systems and some people have slow ones causing them to be fat.

It might be that those people that are not fat have high metabolism you eat as much as you want and not get fat.

Why can a more complex sugar polysaccharide store more energy than a monosaccharide

Polysaccharides have more chemical bonds.

What is the name for the positive subatomic particles in an atom

protons

Which of these is an example of a chemical change

Lighting A Match

Which three elements make up most of the human body

Short Answer:

By weight, oxygen makes up approximately 65% of the human body.

Carbon comes in second with 18% of the mass

Hydrogen adds 10% more of the mass.

These three account for 93% of the mass of the human body.

Numerically, hydrogen 63% of the total number of atoms in the human body, but it is probably closer to 63% for most people.

Accounting by Mass:

The mass of the human body is provided mostly by oxygen, carbon, hydrogen, nitrogen. Together these elements account for about 96% of the mass of a human.

Add in about a kilogram of calcium in the bones and body fluids and you are up to 97.4%. All of this depends on the particular person since water, our major component, can differ by 10% from one individual to another.

That said, typically the breakdown goes like this.

Oxygen: 65% of the mass

Carbon: 18% of the mass

Hydrogen: 10% of the mass

Nitrogen: 3% of the mass

Calcium: 1.4 % of the mass

Phosphorus 1.1% of the mass

With phosphorus, one has accounted for 98.5% of the mass of the typical human and that will change by a couple of tenths from person to person.

Accounting by Numbers:

Numerically we have nearly twice as many hydrogen atoms in our bodies as compared to all other elements combined. Specifically, hydrogen counts as 63% of our atoms by number, give or take a bit, but being so light it barely gets to 10% of our mass. Oxygen atoms count as 24% and carbon atoms are a mere 12% of the populations. Together, our three basic organic building blocks account for 99% of all the atoms in the body.

Caveat:

As was said above, the water content of the human body weight varieties between 55 to 65 % from one person to the next and being the major component changes the numbers above a little for each individual.

Summary:

Almost 99% of the mass of the human body is made up of the six elements oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

Most of the last 1% is made up of five elements: potassium, sulfur, sodium, chlorine, and magnesium, but a tenth of a percent or so is made up of another dozen or so elements which include those recognized as essential to health such as iron, iodine and fluorine as well as beneficial trace elements like manganese, copper and zinc.

Why are proteins considered organic molecules

They contain many carbon atoms

What causes an unsaturated fatty acid to have a different shape than a saturated fatty acid

Unsaturated fatty acids have double carbon bonds.

There are many attempts to increase the amount of food produced which method is known to have harmful effects on the health of humans

overuse of pesticides

Nucleic acids and carbohydrates are both types of what

Macromolecules

What do you call structures that have no current function

Vestigial structures have no current function. Vestigial structures.

There are five different types of nucleotide bases found in living things. Which is an accurate comparison of the bases found in bird and the bases found in flowers

Birds and flowers have different arrangements of the bases.

Why is it important for scientist waterproof is tested One fabric couch is treated with the chemical and another identical couch is not Which is the experimental group

The treated couch is the experimental.

Picture of Chinese chives

Look in the related link I will make below, where a picture may be seen.

Which best describes the scientists who contributed to our current body of knowledge

scientists from all areas of the world

men and women throughout time

The molecules that make up food contain energy. how does the human body get energy from the food molecules

by breaking chemical bonds in the molecules

What kind of molecule is represented in the diagram

a lipid

There are five different types of nucleotide bases found in living things. Which is an accurate comparison of the bases found in bears as opposed to the bases found in raccoons

They have the same bases in different orders

What is the following is most likely the result of an organism having lipids in its body

water cannot be absorbed through the surface of a leaf

Which is not an example of matter and energy cycling through living things

helping hand

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