the second statement is the correct one quarks are needed to balance charges in all subatomic particles such as neutrons, protons and electrons
A combustion reaction takes place in the presence of O2 (g). The
products of a complete combustion reaction are CO2 (g) and H2O
(g).
Cl2 + NaI -> NaCl + I2
We are unbalanced with Chlorine and Iodine so we can do this:
Cl2 + 2NaI -> 2NaCl + I2
Reactants: Cl = 2, Na = 2, I = 2
Products: Cl = 2, Na = 2, I = 2
So we are balanced.
An element is a substance that can not be broken down in simpler substances by chemical means. A compound is a substance that contains two or more substances that are chemically combined in a definite and fixed proportion by mass. A mixture is a combination of two or more substances which are not chemically combined. Mouthwash is an example of homogeneous mixture.
Brass is a solution in which a solid is dissolved in a solid.
Option D
<u>Explanation:
</u>
Brass is an example of alloy, a proportionate mixture of two metals: zinc and copper. Alloys are solid-solid solutions where a metal is mixed with one or more other types of metals or non-metals to form a new material, better in mechanical and chemical properties than the original components.
Increased resistance to corrosive actions, increased strength and toughness, better electrical conductivity, wider temperature operability, etc. are some advantages of alloying. Brass is widely used in manufacturing appliance parts and tools including valves, gears and bearings.