Answer:
A.
Explanation:
Physical properties are characteristics of a substance that can be observed or measured without changing the composition of the substance. Some examples of physical properties are its volume and its density. There are two types of physical properties, intensive physical properties and extensive physical properties.
It helps us remember the four bases of dna
Answer : J. J. Thomson’s experiment disproved the theory that an atom is indivisible.
Explanation : Scientist J.J. Thomson did his experiment to prove the existence of electrons. He did the experiment using a cathode ray tube, in which a vacuum-sealed tube with a cathode and anode on one end was placed which created a beam of electrons that traveled towards the other end of the tube. This was the theory that proved that atoms consists of many subatomic particles namely electrons.
I think its B but im not sure...
Chemical reaction: Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq).
aq(<span>aqueous)
means dissolved in water.
s(solid) means that salt (in this reaction </span>PbI₂) not dissolved in water.
This chemical reaction is double displacement reaction - cations (Pb²⁺ and K⁺) and anions (NO₃⁻ and I⁻) <span>of the two reactants switch places and form two new compounds.</span>