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3 years ago

A variety of species of Galapagos finches evolved from one original species long ago through the process of

Chemistry

2 answers:

puteri [66]3 years ago

8 0

Answer: 3

Explanation:

Natural selection is the process where species evolved over time through trying to adapt their environment.

NikAS [45]3 years ago

6 0

Answer:

i believe the answer is 2 ecological succession

Explanation:

if not 2 it would be selective breeding but two makes more sence

let me know if it was helpful

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Van der Waals forces hold molecules together by: A. moving electrons from one molecule to another. B. attracting a lone pair of

Rasek [7]

The forces that are existing between molecules are known as intermolecular forces. These forces which are weaker than ionic and covalent bonds are classified into three types'

--> dipole-dipole attraction

--> VAN DER WAALS FORCES and

--> hydrogen bonding.

Van Der Waals forces was postulated by a Dutch physicist known as Van Der Waals. He postulated the existence of weak, short-range forces of attraction, which are independent of normal bonding forces, between non-polar molecules. He came to this conclusion after studying the behaviour of real gases at low temperatures and high pressures that:

--> electrons in a non-polar molecule such as hydrogen are close to one nucleus as to the other, although momentary concentration at one end of the molecule may occur,

--> this momentary concentration of electron cloud on one side create a temporary dipole in the hydrogen molecule, that is, one side of the molecule acquires a partial negative charge while the other side acquires a partial positive charge of equal magnitude,

--> the temporary dipole induces a similar dipole in an adjacent molecule,

--> this results in a temporary dipole-induced dipole attraction between the positive and negative ends of the adjacent molecules.

This is how weak Van Der Waals forces are set up. Therefore, option C is CORRECT which states that VAN DER WAALS forces hold molecules together by inducing temporary dipoles that attract each other.

Learn more about Van Der Waals forces here:

brainly.com/question/11457190

6 0

3 years ago

In Rutherford’s gold foil experiment, most alpha particles passed through the gold foil without deflection and were detected on

Brrunno [24]

Answer:

empty space in the atoms present in the gold foil

5 0

4 years ago

Problem Page Cobalt(II) chloride forms several hydrates with the general formula , where is an integer. If the hydrate is heated

steposvetlana [31]

The question has missing information, the complete question is:

Cobalt(II) chloride forms several hydrates with the general formula CoCl₂.xH₂O, where x is an integer. If the hydrate is heated, the water can be driven off, leaving pure CoCl₂ behind. Suppose a sample of a certain hydrate is heated until all the water is removed, and it's found that the mass of the sample decreases by 22.0%. Which hydrate is it? That is, what is x?

Answer:

CoCl₂.26H₂O

Explanation:

The molar masses of the compounds that forms the hydrate are:

Co = 59 g/mol

Cl = 35.5 g/mol

H = 1 g/mol

O = 16 g/mol

The molar mass of CoCl₂ is 130 g/mol and of H₂O is 18 g/mol, thus for the hydrate, it will be 130 + 18x g/mol.

Let's suppose 1 mol of the compound. Thus, the mass of the hydrate is: 130 + 18x, and the mass of CoCl₂ will be 130 g. Because the mass decreassed by 22.0% :

0.22*(130 + 18x) = 130

130 + 18x = 590.91

18x = 460.91

x ≅ 26

Thus, the hydrate is CoCl₂.26H₂O

7 0

4 years ago

Read 2 more answers

Most metals are very reactive, as are the elements in the halogen group. Aluminum, for instance, For example, reacts with elemen

steposvetlana [31]

Answer: B. you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles of aluminium}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{13.5g}{27g/mol}=0.5moles$

The balanced reaction is:

$2Al+3Cl_2(g)\rightarrow 2AlCl_3$

2 moles of aluminium react with= 3 moles of chlorine

Thus 0.5 moles of aluminium react with= $\frac{3}{2}\times 0.5=0.75$ moles of chlorine

Mass of chlorine= $moles\times {\text{Molar Mass}}=0.75\times 71=53.2g$

2 moles of aluminium produce = 2 moles of aluminium chloride

Thus 0.5 moles of aluminium react with= $\frac{2}{2}\times 0.5=0.5$ moles of aluminium chloride

Mass of aluminium chloride= $moles\times {\text{Molar Mass}}=0.5\times 133.34=66.7g$

Thus 53.2 g of chlorine is used and 66.7 g of aluminium chloride is produced.

5 0

3 years ago

Why does silicon in silicon dioxide bond with 4 oxygen atoms and not 2?

Elis [28]

Answer:

Silicon does not form double bonds with oxygen, whereas carbon is capable of forming double bonds with oxygen. While the carbon dioxide molecular structure is linear, the silicon dioxide has an extended, different covalent structure.

Explanation:

If the sizes of the atoms of Silicon (Si) and Carbon (C) are compared to each other, the Si atoms are larger than carbon - which implies that the Si-O bonds will be longer than the C-O bonds. As a result, the p orbitals present on the Si and O atoms aren't very near to each other, in order to get together for the required overlap sideways which could have formed a stable pi bond. Hence, Silicon forms only single covalent bonds with Oxygen in silicon dioxide, in the form of a diamond structure with each Si atom being connected to its four neighbouring atoms through an O atom.

On the other hand, in the case of carbon dioxide, C is perfectly capable of forming double bonds with O. The different p orbitals are brought close together, resulting in a sideways overlap that leads to two pi bonds, twisted at a right angle to each other. As a result, the Carbon in carbon dioxide bonds with 2 oxygen atoms but not 4.

5 0

4 years ago