CHEMISTRY MIDDLE SCHOOL

What do all four of these molecules have in common? A.
They are essential to life.

B.
They carry signals.

C.
They are water soluble.

D.
They act as a source of energy

Answers

Answer 1
Answer: I did a quick search and found the diagram. Let's go through these and solve by elimination. 

B. Proteins can act as receptors which I guess could be considered a signal, but the rest of the molecules do not. B is incorrect. 

C. Lipids are not water soluble. An example of lipids are fats, and oils. Have you ever tried combining water and oil? Think about salad dressing, it does not mix. C is incorrect.

D. Carbohydrates and lipids are sources of energy, but nucleic acids and proteins are not. D is incorrect. 

The answer is A. because we know that our bodies are made up of nucleic acids, protein, fats, and we need carbohydrates in order to live normal, healthy lives. 
Answer 2
Answer: A. They are Essential to Life

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How many atoms in 54.0 g of aluminum

Answers

There are 12.052 ×10²³ atoms in 54 g of aluminium according to the concept  of Avogadro's number.

What is Avogadro's number?

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present  in the sample.

It  has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating  amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as  follows: mass/molar mass×Avogadro's number

Substituting the values in the formula,54/26.98×6.022×10²³=12.052×10²³ atoms .

Hence, there are 12.052×10²³ atoms in 54 g of aluminium.

Learn more about Avogadro's number ,here:

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What is the Big Bang

Answers

the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe.

explain the difference of valence electron behavior between ionic bonds and covalent bonds. Give an example of each type of bond using the three main groups from the periodic table.

Answers

Ionic bonds are typically weak, non-directional primary bonds between atoms, where one cation donates its valence electrons to one or more anions. They often occur between a metal and a non-metal such as table salt (NaCl). Materials made from ionic bonds tend to be more ductile than covalent ones but are still more brittle than metallic bonded ones.
Covalent bonding is a strong type of primary bond that is highly directional as the atoms share their valence electrons. This makes the material less ductile. An example of this is carbon-carbon bonds in diamond.

Which is an example of an organism? A. an octopus B. sand granules C. water D. the colors of a feather

Answers

A. An octopus

An organism is an individual animal, plant, or single-celled life form.

The octopus is the only living thing listed so that is why it is the example of an organism

How many grams of magnesium contain 4.80 x 10^25 atoms of magnesium

Answers

Answer:

mass Mg = 1.937 Kg

Explanation:

from periodic table for Mg:

⇒ molecular mass Mg = 24.305 g/mol

∴ mol ≡ 6.022 E23 atoms

⇒ mol Mg = (4.80 E25 atoms)×(mol/6.022 E23 atoms)

⇒ mol Mg = 79.708 mol

⇒ mass Mg = (79.708 mol)×(24.305 g/mol)

⇒ mass Mg = 1937.3 g

⇒ mass Mg = 1.937 Kg

Is it true oxygen is an excellent solvent that is capable of dissolving just about anything?

Answers

Well water dissolves many substances more than any other liquid so yes I would say it is capable of dissolving just about everything. 
Well water dissolves many substances more than any other liquid so yes I would say it is capable of dissolving just about everything. 
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