CHEMISTRY MIDDLE SCHOOL

There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification?Choose all answers that are correct.

A.Class

B.Order

C.Family

D.Level

Answers

Answer 1
Answer: A) The class and C) Family would be the only accurate option. Here are the levels from largest to smallest: kingdom, phylum, class, order, family, genus and species.

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Are most elements on the periodic table nonmetals?

Answers

wouldn’t say most but yes

Final answer:

No, most elements on the periodic table are not nonmetals. About 75% of the elements on the periodic table are metals, with nonmetals including the Noble Gases, Halogens, Nitrogen and Oxygen making up a smaller portion. Additionally, the Metalliods, which are elements with properties of both metals and nonmetals, also hold a place on the periodic table.

Explanation:

No, most elements on the periodic table are not nonmetals, but rather metals. The periodic table is primarily comprised of metals, with the so-called 'metal' elements making up about 75% of the table's total elements. Nonmetals count for only a small part, located on the right side of the table. They include the Noble Gases, the Halogens, and some others like Nitrogen and Oxygen

Furthermore, there are a group of elements known as the Metalliods or Semi-Metals which have properties in between metals and nonmetals. These are located in a diagonal line from Boron to Astatine.

Learn more about Periodic Table here:

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Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms?A.His results gave people a picture of what atoms look like for the first time.
B.His results gave the first clues that atoms could be created and destroyed.
C.His results gave the first experimental evidence that matter is made up of atoms.
D.His results gave the first evidence that atoms were made up of smaller particles.

Answers

Answer:

D, because he discovered electrons

Explanation:

His results gave the first evidence that atoms were made up of smaller particles.

baseball fields have dirt in the infield and grass in the outfield. the is more likely to erode because

Answers

grass is more likely to erode.

Complete the paragraph to describe the characteristics of a silicon tetrahydride molecule (SiH4). The Lewis structure and table of electronegativities are given.

Answers

Answer: The correct answer is polar, tetrahedral and non-polar.

Explanation:

It is given a compound which is silicon tetrahydride having formula SiH_4

The electronegativities of silicon and hydrogen are 1.9 and 2.1 respectively.

Difference in electronegativity = 2.1 - 1.9 = 0.2

From above, some difference in the electronegativities of the atoms is there. This means that bond polarity of this molecule is polar. If the difference would have been 0, the bond polarity of the molecule is taken as non-polar.

  • To determine the molecular shape of the given molecule, we calculate the hybridization of this molecule. The equation used for this is:  

\text{Number of electrons}=(1)/(2)[V+N-C+A]

where,  

V = number of valence electrons present in central atom i.e. Silicon = 4

N = number of monovalent atoms bonded to central atom = 4

C = charge of cation = 0

A = charge of anion = 0

Putting values in above equation, we get:  

\text{Number of electron pairs} =(1)/(2)[4+4-0+0]=4

As, the total number of electron pairs is 4, this means that the hybridization of this molecule will be sp^3 and the molecular shape will be tetrahedral.

  • The net dipole moment of the molecule is 0 because of the symmetry of the molecule. Thus, the molecule is considered as a non-polar molecule.

Hence, the correct answer is polar, tetrahedral and non-polar.

mosquitoes get their food by sucking other animals blood, sometimes giving it disease. what type of symbiosis is this.

Answers

Answer:

The symbiosis between mosquitoes and the microorganisms responsibles of disease is endosymbiosis.

Explanation:

Mosquitoes usually have different microorganism inside their digestive tract. When mosquitoes suck other animals blood, their transmit those microorganisms (frequently parasites) to the animal. In these cases mosquitoes are called vectors, organisms that have microorganisms (endosymbionts) inside but do not suffer any consequences, they only act as a house for the endosymbiont.  
I believe that would be a parasitism because one organism benefits yet the other is harmed.

What is the volume, to the nearest whole cubic inch, of a cylinder with a height of 10 inches and a radius of 8 inches? Use Pi = 3.14 and round your answer to the whole number.cubic inches

Answers

Answer:

v=2010 inches^3

Explanation:

The volume of a cylinder can be found using:

v=\pi r^2h

We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi

v=3.14(8^2)(10)

Solve the exponent first

v=3.14(64)(10)

v=3.14(640)

v=2009.6

To the nearest whole number:

v=2010 inches^3

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