CHEMISTRY MIDDLE SCHOOL

Some land plants have evolved specialized vascular tissues that have allowed them to thrive on land. The developement of these structures was necessary becauseLand plants need to extract water from the ground and move it to the other structures of the plant.
Land plants need to be tall and the vascular tissues are what provide rigidity to the plant’s cells.
Land plants need to photosynthesize and the vascular tissues is where this process occurs.
Land plants don’t really need these structures as they can absorb water from the air through their leaves.

Answers

Answer 1
Answer: Plants are multicellular organisms that have evolved the ability to live on land. ... resemble the earliest land plants (bryophytes) in a variety of ways, including the structure ... These possessspecialized vascular tissues— phloem and xylem —to ... However, they are not restricted to thesehabitats, and some mosses thrive in ...

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1. What elements are carbohydrates generally composed of?

Answers

The correct answer is  hydrogen, and oxygen. 
the answer is hydrogen,oxygen,and carbon

Which element melts at room temperature?

Answers

A melting element at room temperature consist of francium.

~Evie
Francium is an element that melts at room temperature. Francium is a highly reactive element, and only contains one valence electron, which is very ironic in my opinion. 

Please help! Which halogen has the strongest IMF and why? ​

Answers

Answer:

The larger the species, the further away from the nucleus the outer electrons are and hence the less strongly they are held. This means the bigger atoms will be more polarizable. So, the order from biggest-smallest molecules (strongest to weakest IMF) is iodine, bromine and finally chlorine.

Explanation:

What hapeens to water once it reches the earth's surface

Answers

It either sinks into the ground or will eventually ending up in aquifers. It would also probably run of into creeks and rivers. Once its in the ground, its called "ground water".
Hope this helps!:)
It either soaks into the ground, or it's eventually going to end up in the acquifers. Also it runs off into the creeks and rivers eventually reaching the ocean. Once it goes into the ground the water becomes ground water.

Write about the characteristics of carbon compounds:the carbon atom
structure
connection types;

Answers

The characteristics of carbon compounds are they exist with different structures in which the atoms are arranged differently and it forms more compounds than other elements combined.

Explanation:

The carbon atom has atomic number 6 which represents the number of electrons. It is represented by C and it is a non- metal. It has 6 protons, 6 neutrons, and 6 electrons. They are smaller in size so that it can fit in to larger molecules.

It is the only element that can form different compounds because each carbon atoms can form four chemical bonds to other atoms.

The structure of carbon atom is represented with its atomic number 6. The first two electrons are present in inner shell and the remaining four are present in the second shell.

The carbon combines with oxygen, hydrogen, and nitrogen to form many molecules for cellular function. Carbon and hydrogen combine to form hydrocarbon chains and rings.

For example the structural formula for Methane (CH4)

     

How many moles of oxygen are required to react completely with 16.5 mol Al?

Answers

Answer:

12.4 mol O2

Explanation:

                                4Al +       3O2 -----> 2Al2O3

from reaction          4 mol        3 mol

given                    16.5 mol       x mol

x = 16.5*3/4 =12.4 mol    O2
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