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sleet_krkn [62]
4 years ago
13

The identities of substances are the same before and after which type of change

Chemistry
1 answer:
Alenkinab [10]4 years ago
5 0
The answer would be , a Chemical change!
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0.25 g Al equals how many moles?
Mariulka [41]
0.25 g al should equal around 0.009265594867125 moles

I hope this help

5 0
3 years ago
Read 2 more answers
PLEASE HELP!!
NARA [144]
We can skip option B and D because NaCl is salt and H₂SO₄ is a strong acid.
Neutralization reactions are those reactions in which acid and base react to form salt and water.
As water being amphoteric in nature can react with HCl as follow,

                           HCl  +  H₂O   ⇆  H₃O⁺  +  OH⁻

In this case no salt is formed, so we can skip this option.

Ammonia being a weak base can abstract proton from HCl as follow,

                              HCl  +  NH₃  →  NH₄Cl

Ammonium Chloride is a salt. So, among all four options, Option-C is the correct answer.
3 0
3 years ago
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Match each body system with its main organ.
olya-2409 [2.1K]

Answer:

it's in the explanation

Explanation:

Lungs- Respiratory

Heart- Circulatory

Brain- Nervous

Stomach- Digestive

Bladder- Excretory

7 0
3 years ago
What does image 2 show?
lutik1710 [3]

Answer:

A GALAXY WIITH I YHINK MANY

Explanation:

3 0
3 years ago
In electrophilic aromatic substitution reactions the hydroxyl group is an o p-director because?
Natalka [10]

In electrophilic aromatic substitution reactions the hydroxyl group is an o,p-director because: hydroxyl group donates the electron density to the ring by induction and destabilizes the meta sigma complex and  by resonance and it  stabilizes the ortho and para sigma complexes of aromatic ring .

Most ring activators have atoms with unshared electron pairs directly attached to a carbon atom of the benzene ring . For example, the — OH group has two pairs of unshared electrons on the oxygen atom , which will form a bond to a carbon atom of the benzene ring . Thus , the — OH group will be an activating group in electrophilic aromatic substitution reactions .

to learn more about electrophilic aromatic substitution reactions please click here ,

brainly.com/question/28286554

#SPJ4

5 0
2 years ago
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