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mrs_skeptik [129]
3 years ago
15

Which if the following is likely to be found in placer deposits

Chemistry
1 answer:
cestrela7 [59]3 years ago
3 0
The answer is A. Gold
You might be interested in
N the ionic compound aluminum selenide, each atom of aluminum (gains or loses)
Volgvan

Answer:

loses, gains

Explanation:

In the ionic compound aluminum selenide, each atom of aluminum will lose electrons while each atom of selenium will gain the electrons.

An ionic compound is an interatomic bond formed between a metal and non-metal. The metal is less electronegative compared to the non-metal. In this case, the metal will lose electrons to become positively charged whereas the non-metal, selenium will gain the electron to become negatively charged.

The electrostatic attraction between these oppositely charged ions leads to the formation of the ionic bond.

6 0
2 years ago
How do metals form chemical bonds with other metals?
gogolik [260]

Answer:

Metallic bonding  

Explanation:

Metals have low ionization energies. Therefore, their valence electrons are easily delocalized (attracted to the neighbouring metal atoms). These delocalized electrons are then not associated with a specific metal atom.  Since the electrons are “free”, the metal atoms have become cations, and the electrons are free to move throughout the whole crystalline structure.

We say that a metal consists of an array of cations immersed in a sea of electrons .

The electrons act as a “glue” holding the cations together.

Metallic bonds are the attractive forces between the metal cations and the sea of electrons.

In an NaK alloy, for example, the Na and K atoms contribute their valence electrons to the "sea".  The atoms aren’t bonded to each other, but they are held in place by the metallic bonding.

4 0
2 years ago
Read 2 more answers
Which statement describes the motion of the sun?
balu736 [363]

different parts of the sum rotate at different rates

5 0
3 years ago
Read 2 more answers
To prepare 1.00 L of 14g BaCl2, what Molarity would it be?​
nikklg [1K]

Answer:

0.067 M  

Explanation:

Given data:

Volume of solution = 1.00 L

Mass of BaCl₂ = 14 g

Molarity of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Now we will calculate the number of moles first.

Number of moles = mass/ molar mass

Number of moles = 14 g/ 208.23 g/mol

Number of moles = 0.067 mol

Now we will calculate the molarity.

Molarity = 0.067 mol / 1.00 L

Molarity  = 0.067 M    ( mol/L=M)

6 0
3 years ago
What element has a mass number of 138 and protons equal to 57?
Murljashka [212]


Basic Information
Name:<span> Lanthanum </span>
Symbol:<span> La </span>
Atomic Number:<span> 57 </span>
Atomic Mass:<span> 138.9055 amu </span>
Melting Point:<span> 920.0 °C (1193.15 K, 1688.0 °F) </span>
Boiling Point:<span> 3469.0 °C (3742.15 K, 6276.2 °F) </span>
Number of Protons/Electrons:<span> 57 </span>
Number of Neutrons:<span> 82 </span>
Classification: Rare Earth 
Crystal Structure:<span> Hexagonal </span>
Density @ 293 K:<span> 6.7 g/cm</span>3 
Color:<span> white

</span>
6 0
3 years ago
Read 2 more answers
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