Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
- particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)
- liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a <em>really tight</em> crowd I guess
- gas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.
- since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.
you can refer to your coursebooks :)
correct where wrong please:)
Answer 1: Atoms gain valence electrons to form anions.
Explanation:
Anions are negatively charged species of an ions. Anions are formed when atoms with nearly complete octet gains electrons.
Answer 2: Emission spectrum
Explanation:
When ever electron jumps from higher energy to lower energy level energy is emitted out in the form of light.The wavelength of the light is given as :
, E = energy, c= speed the light, h= planck constant
Answer 3: Two atoms of silicons could combine by fusion in order to create nickel.
Explanation:
Silicon has atomic number of 14 with atomic mass of 28 u.
nickel has atomic number of 28 with atomic mass of 59 u.
Two different isotopes of silicon atom will fuse together to give nickel.
Actually we can see a lot of trends in the periodic
table.
With regards to the atomic radius of the elements,
going up to down there is an increasing pattern in the atomic radius.
While going left to right there is a decreasing
pattern in the atomic radius.
<span>
Hence the smallest radius is on the upper right of the table.</span>
Answer:
18 c
19 b
20 a
21 a
Explanation:
18 LiOH is a powerful base citric acid is a weak acid so when we mix a powerful base with a weak acid mixture become basic
when we mix powerful base with a powerful acid it becomes neutral(need to take equal quantities)
when we mix powerful acid with weak base mixture becomes acidic
when we mix weak acid with weak base we cannot tell what happens to find this we need to do some calculations
19 when the ka value is high it becomes more acidic
20 A polyprotic acid is an acid that can donate more than one proton or hydrogen atom per molecule to an aqueous solution. In contrast, a monoprotic acid (e.g., HCl) can only donate one proton per molecule.
so here it has 3H so it can donate 3H+
in here we need to write the ionization of the acid in water
do the answer is a
21 A proton acceptor is another name for a base, which is the opposite of an acid. In the Broensted-Lowry definition, a base is a negatively charged ion that will react with, or accept, a positively charged hydrogen ion. Since a hydrogen ion is a proton, the base is called a proton acceptor.
an acid is any proton donor, and a base is any proton acceptor. The focus of this definition is on donating and accepting protons, and is not limited to aqueous solution. The Brønsted-Lowry definition of acids and bases is one of two definitions we commonly use
The correct answer is c, it’s evaporating there for it’s a chemical change