Answer:
-The other substances that give a positive test with AgNO3 are other chlorides present, iodides and bromide.
-It is reasonable to exclude iodides and bromides but it is not reasonable to exclude other chlorides
Explanation:
In the qualitative determination of halogen ions, silver nitrate solution(AgNO3) is usually used. Now, various halide ions will give various colours of precipitate when mixed with with silver nitrate. For example, chlorides(Cl-) normally yield a white precipitate, bromides(Br-) normally yield a cream precipitate while iodides (I-) normally yield a yellow precipitate. Thus, all these ions or some of them may be present in the system.
With that being said, if other chlorides are present, they will also yield a white precipitate just like KCl leading to a false positive test for KCl. However, since other halogen ions yield precipitates of different colours, they don't lead to a false test for KCl. Thus, we can exclude other halides from the tendency to give us a false positive test for KCl but not other chlorides.
Assuming you have multiple choices... According to the internet, this question is a multiple choice question.
Here are following answers.
"The environmental change that occurs faster is definitely volcanic eruption. It may happen in an instant and destroy everything in its way, whereas the process of regrowth of forest after volcanic eruption is a slow one."
Oil spills may also have the fastest occurring changes in the environment.
Quoted answers are NOT Mine! All credits reserved to the owners:
@WorldlyGlass49 and @<span>Avery123</span>
Another name for a mesh screen is a sieve.
Answer:
Option A is correct. Statements b,c and d are true
Explanation:
Step 1: Data given
Proton = a subatomic particle with a positive electric charge of +1 and a mass slightly less than that of a neutron.
Neutron = a subatomic particle of about the same mass as a proton but without an electric charge
electron = a subatomic particle whose electric charge is negative one elementary charge.
The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom
Step 2: Statements
(a) Protons have a charge of -1.
This is false. Protons have a charge of +1
(b) Neutrons have no charge.
This is true
(c) An electron has negligible mass compared to the mass of a neutron
This is true
(d)Number of proton equals to number of electrons on a stable atom
This is true. A stable atom has a charge of 0. this means the same amount of protons and electrons
Option A is correct. Statements b,c and d are true
Answer:
C. 60 mL
Explanation:
Boyle's Law P₁V₁ = P₂V₂
(50kPa)(150.0mL) = (125kPa)(V₂)
V₂ = 7500/125
V₂ = 60 mL