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vesna_86 [32]
4 years ago
6

Which statement is true about metals and metalloids? A. All metals and metalloids have luster. B. Metals are good conductors and

metalloids are bad conductors C. Metals are nonmalleable and metalloids are malleable
Chemistry
2 answers:
Aleks [24]4 years ago
7 0
I believe the statement that is true of metals and metalloids is B. Metals are good conductors and metalloids are bad conductors.
lbvjy [14]4 years ago
7 0
The properties of metals are that they are: m<span>alleable, ductile, luster, and good conductors of heat and electricity. Metalloids can be shiny and dull and have conductivities larger than non-metal but not as high as that of the metals. The answer hence that applies here is A</span>
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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ∆H° for the r
Kazeer [188]

Answer:

∆H° rxn = - 93 kJ

Explanation:

Recall that a change in standard in enthalpy, ∆H°, can be calculated from the inventory of the energies, H, of the bonds  broken minus bonds formed (H according to Hess Law.

We need to find in an appropiate reference table the bond energies for all the species in the reactions and then compute the result.

              N₂ (g)   +            3H₂ (g)   ⇒                          2NH₃ (g)

1 N≡N = 1(945 kJ/mol)     3 H-H = 3 (432 kJ/mol)       6 N-H = 6 ( 389 kJ/mol)

∆H° rxn = ∑  H bonds broken  - ∑ H bonds formed

∆H° rxn = [ 1(945 kJ)   + 3 (432 kJ) ] - [ 6 (389 k J]

∆H° rxn = 2,241 kJ -2334 kJ = -93 kJ

be careful when reading values from the reference table since you will find listed N-N bond energy (single bond), but we have instead a triple bond,  N≡N,  we have to use this one .

8 0
3 years ago
I will go to the app and give you brainly Est if u answer correctly ASAPPPPP
zhuklara [117]

Answer:

C

Explanation:

I think it is C

4 0
3 years ago
What is the mass of 1.71 ✕ 1023 molecules of h2so4?
Anuta_ua [19.1K]
The equation for calculating a mass is as follows:

m=n×M

Molar mass (M) we can determine from Ar that can read in a periodical table, and a number of moles we can calculate from the available date for N:

n(H2SO4)=N/NA

n(H2SO4)= 1.7×10²³ / 6 × 10²³

n(H2SO4)= 0.3 mole

Now we can calculate a mass of H2SO4:

m(H2SO4) = n×M = 0.3 × 98 = 27.8 g



7 0
4 years ago
What is the current model of atom
leonid [27]

Answer:

The bohr model is the model in use today

7 0
3 years ago
Carbon dioxide and water react to form bicarbonate ion and hydronium ion. Hyperventilation (rapid breathing) causes more carbon
Pani-rosa [81]

Answer:When a person hyperventilates they exhale more carbon dioxide than normal. As a result the carbon dioxide concentration in the blood is reduced and the bicarbonate/carbonic acid equilibrium shifts to the left. The corresponding drop in H3O+ concentration causes an increase in pH.

Explanation:

5 0
3 years ago
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