CHEMISTRY MIDDLE SCHOOL

Describe two ways in which the evolution of organisms can have a harmful effect on humans

Answers

Answer 1
Answer: Evolution of organisms can be harmful to human because they evolve into mutation that can harm the environment and the human being.
The second reason is when they evolve and grow, they could swallow other needed cells that could damage the human body.
Explanation:

If engineers may design the foremost economical anatomy, it might doubtless look significantly completely different than our actual anatomy. That’s as a result of evolution hasn’t left the North American nation with an ideal type however rather a hodgepodge of diversifications.

The evolution of antibiotic resistance in a bacterium, that contains an important harmful result on humans having a curved spine causes multiplied stress on sure points of the column, which ends in all-too-familiar ailments, like slipped disks, backache, scoliosis, kyphosis.
Answer 2
Answer: Evolution of organisms can be harmful to human because they evolve into mutation that can harm the environment and the human being. Second reason is when they evolve and grow, they could swallow other needed cells that could damage the human body.

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What ion is present in all acid solutions?
A natural sample of neon has a relative atomic mass of 20.2.What is the mass number of the most common type of atom in the sample of neon?

How many hydrogen atoms are in CH2OH?

a-10
b-3
c-5
d-4

Answers

Answer:

B)3

Explanation:

I'm assuming the 2 is meant to be smaller. If it were a regular size 2 the answer would be 2 and that isn't an option
The answer is B. 3 because H2 plus H1 is 3 hydrogen

Why is it correct to say seawater is a mixture.

Answers

It's a mixture of H2O + a soluble substance like, salt.

Answer:

It's a mixture of H2O + a soluble substance like, salt.

Explanation:

Which of the following statements is true?1. Dalton believed atoms were made mostly of empty space.
2. Plasmas have a net negative charge.
3. The number of protons in an element is always equal to the number of neutrons.
4. Solids have a fixed mass, volume, and shape.

Answers

Answer:  Solids have a fixed mass, volume, and shape.

Explanation:  Solids are the substances which have fixed shape, fixed volume and mass due to its close packed structure.

Dalton explained that all the elements are made up of small indivisible particle known as Atoms but after some time this was proved wrong as atoms is not indivisble, it conatins sub atomic particle like electrons, protons, neutrons etc.

Plasmas are considered as the fourth state of matter which contains equal quantity of positive ions and negative electrons.

The number of protons are equal to the number of electrons. The sum of number of protons and neutrons make the atomic mass quantity.
solids have a mixed mass, volume, and shape.

what ere the different types of petrol used in petrol pumps?what is the composition of each and what type of vehicle is each suitable for?is there a difference in the price?

Answers

Petrol is primarily characterised by its octane number which defines its ability to burn efficiently and produce more energy per unit. A low octane petrol particle blast inside the engine instead of burning from spark this is called knocking as it produces knocking sound in the engine, to counter this an anti-knocking agent is added to petrol. Earlier Lead was used as an anti-knocking agent but it is highly toxic ,also the researchers who experimented lead with petrol died unnatural death. In later stages when effects of lead toxicity started showing up lead was replaced by benzene compounds as anti-knocking agents this is know as Unleaded petrol. Benzene is carcinogenic and started showing its ill effects after few years especially in densely populated cities. Govts have reduced the concentration of benzene in petrol thereafter and emphasised on implementation of Euro iv standards.

What is the optimal level of fluoride in water?

Answers

Answer:

The agency's recommended ratio of fluoride to water, newly calibrated at 0.7 parts per million, results from years of scientifically rigorous analysis of the amount of fluoride people receive from all sources.

What causes some materials to have magnetic fields?

Answers

Magnetic fields in certain materials (most commonly metals) are created due to moving electrons within these materials, which create an electric current.The distribution of electrons in these metals is uneven, resulting in an irregular rotation and lots of movement that then creates two magnetic poles (a north and south pole). When these poles align and face the same direction, they create a magnetic field.

Final answer:

Magnetic fields in materials are due to the alignment of magnetic dipoles within their atoms. Ferromagnetic materials, like iron, have magnetic domains where magnetic dipoles are rigidly aligned, allowing these materials to become magnets. Diamagnetic materials, on the other hand, only display magnetic fields when an external magnetic field is applied.

Explanation:

Magnetic fields in materials are caused by the alignment of magnetic dipoles within the atoms of the materials. In the case of ferromagnetic materials like iron, cobalt, nickel, and gadolinium, tiny regions called magnetic domains contain magnetic dipoles rigidly aligned in the same direction. The coupling among these atoms is so strong that even thermal agitation cannot break it, creating a net dipole moment for the entire domain. For this reason, ferromagnetic materials can be induced to become magnetic or made into permanent magnets.

On the other hand, diamagnetic materials have no permanent magnetic dipole moments. When a magnetic field is applied to these materials, it induces a magnetic dipole in an atom which points opposite to the applied field. This induced dipole thus produces a magnetic field that is also directed opposite to the applied field.

Lastly, all matter has a property called a magnetic dipole moment. A magnetic field can be caused by a magnet, a moving electrically charged object or by magnetic dipoles or combinations of dipoles. However, magnetic fields observed in nature are not produced by single poles.

Learn more about Magnetic Fields here:

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