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3 years ago

8.

Chemistry

1 answer:

White raven [17]3 years ago

6 0

Answer:

mixture of four compounds

mixture of two elements and two compounds

Explanation:

it can be one of those
can u tell me if its correct pls I'm studying this too

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Name two compounds with more exothermic lattice energies than scandium oxide and justify your choice.

N76 [4]

Answer:

1 . $Al_2O_3$

2. $TiO_2$

Explanation:

The more stable the ionic compound, the more is it lattice energy.

The more the charge on the cation and the anion, the greater is the lattice energy.
The less the size of the cation and the anion, the greater is the lattice energy.

Scandium oxide ( $Sc_2O_3$ ) is an oxide in which $Sc^{3+}$ behaves as cation and $O^{2-}$ behaves as anion.

The compounds which has higher lattice energy than scandium oxide are:

1 . $Al_2O_3$

This is because the charge are same on the cation and the anion as in the case of the Scandium oxide but the size of the cation $Al^{3+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

2. $TiO_2$

This is because the charge on the cation $Ti^{4+}$ is greater than that of $Sc^{3+}$ and also the size of the cation $Ti^{4+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

3 0

3 years ago

From the mass of Al reacted, how many moles are present? What is the mole ratio between Al and H2 in the balanced chemical react

tigry1 [53]

Answer:

From the mass of Al reacted, how many moles are present? We don't have the mass of Al reacted

What is the mole ratio between Al and H2 in the balanced chemical reaction?

By stoichiometry, ratio between Al and H₂ is 3:2

What units are required on the temperature when doing calculations with gases? °K degrees

The value of R is 0.082 L.atm/mol.K

Explanation:

A chemical reaction for this can be this one:

2Al (s) + 6HCl (aq) → 2AlCl₃(aq) + 3H₂ (g)

Balanced

To get the moles which are present in the mass of Al reacted you must calculate:

Al Mass / Al molar mass = Al moles

The Ideal Gas equation is this one:

Pressure . Volume = n° moles . R (gases constant) . T°K

The temperature must be in K, because the units of R

We usually use R = 0.082 L.atm/mol.K

5 0

3 years ago

Translate this word equation into a formula equation:

kolezko [41]

3Ba + Au3(PO)2 =Ba3(PO)2 + 3Au

7 0

3 years ago

If you found carbon 13 atom, you would know that

bearhunter [10]

The Options are as follow,

a. it has 13 protons c. it has 13 neutrons

b. it has 13 electrons d. it has 7 neutrons

Answer:

Option-d is the correct answer.

Explanation:

As we know that C-13 has a atomic mass of 13. Also, atomic mass is given as,

Atomic Mass = # of Protons + # of Neutrons --- (1)

Since;

Atomic Mass = 13

And,

# of protons = 6 (as number of protons = atomic number)

Putting values in equation 1,

13 = 6 - # of Neutrons

Solving for Number of Neutrons,

# of Neutrons = 13 - 6

# of Neutrons = 7

3 0

3 years ago

Tyndall effect example (any 2)

Ronch [10]

Answer:

1. Sunlight path becoming visible when lots of dust particles are suspended in the air such as light passing through the canopy of a dense forest.

2.When a torch is switched on in a foggy environment, the path of the light becomes visible.

4 0

3 years ago