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ololo11 [35]
4 years ago
15

Qualitatively estimate the relative melting points for each of the solids, and rank them in decreasing order. Rank from highest

to lowest melting point.
A. ammonia
B. calcium
C. chloride
D. quartz
Chemistry
1 answer:
baherus [9]4 years ago
3 0

Answer:

The order is

Quartz > Calcium > Ammonia > Chlorine

Explanation:

Among given compounds

Quartz is a covalent compound with extensive bondings and thus it will have highest melting point

Calcium is a metal so it will have strong metallic bonds thus will have high melting point, however less than quartz.

ammonia is a polar molecule with weak hydrogen bond as intermolecular interactions thus will have higher melting point than chlorine

chlorine is a non polar molecule with weak intermolecular london dispersion forces.

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How do atoms, compounds, and elements differ?
Marysya12 [62]
Atoms make up everything,
compounds are 2 or more elements joined together chemically and
elements are groups of atoms that mix to create mixtures (2 it more atoms not chemically combined) and compounds.
5 0
3 years ago
help, please? What science law explains why there should always be the same type of elements on the reactant side as there are o
solniwko [45]

Answer:

the law of conservation of energy states that energy neither created nor destroyed that means in a chemical reaction Mass reactants ( starting material)=tomass of produt

7 0
3 years ago
2.24g of iron combine with 0.96g of oxygen to form an oxide of iron. Determine the formula of this oxide of iron and use it to c
irakobra [83]

Answer:

See Explanation

Explanation:

Let us find the number of moles of each element

For iron = 2.24g/56 = 0.04 moles

For oxygen = 0.96 g/16 = 0.06 moles

Then we divide by the lowest ratio;

0.04/0.04      and     0.06/0.04

1                      and     2

We Thus obtain 1 : 1.5

Multiplying through by 2 we have; 2 : 3

The formula of the oxide formed is Fe2O3

The balanced equation is;

4Fe + 3O2 ------> 2Fe2O3

6 0
3 years ago
1. Predict the charge each of the following atoms would have as an ion – if more than one charge is possible, include each diffe
tia_tia [17]

Answer:

Explanation:

The chlorine is present in group 17. It has seven valance electrons. It accept one electron to complete the octet and show -1 charge and from anion.

Cl⁻

Sodium is present in group one. It alkali metal. It loses one valance electron and show +1 charge. It form sodium cation.

Na⁺

Magnesium is present in group two. It loses its two valance electrons and show +2 charge. It form magnesium cation.

Mg⁺²

Oxygen is present in group 16. It has six valance electrons. It require two electrons to complete the octet and show -2 charge.

O⁻²

Aluminium is present in group 13. it has three valance electrons. It loses its three valance electrons and show +3 oxidation state

Al⁺³ (most common)

others = Al⁺¹,  Al⁺²

Iron is present on group eight.

Fe⁺² , Fe⁺³ (most common)

others = Fe⁺⁴, Fe⁺⁵

Copper is present in group eleven.

Cu⁺¹ Cu⁺²

other = Cu⁺³

Zinc is present in group twelve. -2, 0, +1 , +2

Zn⁻², Zn⁺¹, Zn⁺²

4 0
3 years ago
At equilibrium the concentration of lack is about ten times higher than the concentration of l2
atroni [7]
Yes what you put is true
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